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Showing 1 - 200 of 2355 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 19, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 21, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 23, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 5, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 13, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 6)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 20, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 9, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
Activitas Nervosa Superior     Hybrid Journal  
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 22, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 15, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 34, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 25, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 41, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 2, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 16, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agriculture and Human Values     Hybrid Journal   (Followers: 13, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 19, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 10, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 6, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 4, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 8, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 15, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 25, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 8, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 14, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 14, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 30, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 16, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 12, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 6, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 8, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.186, h-index: 78)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 8, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 14, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 7, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 42, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 16, SJR: 0.267, h-index: 26)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 3, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 4, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 11, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 61, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 7, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 23, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 17, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 22, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 32, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 23, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 56, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 8, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.865, h-index: 40)
Archives and Museum Informatics     Hybrid Journal   (Followers: 131)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 12, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 14, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 8, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 7)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover Arabian Journal of Geosciences
  [SJR: 0.417]   [H-I: 16]   [1 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1866-7538 - ISSN (Online) 1866-7511
   Published by Springer-Verlag Homepage  [2355 journals]
  • Geological and geophysical investigations to delineate the subsurface
           extension and the geological setting of Al Ji’lani layered intrusion and
           its mineralization potentiality, Ad Dawadimi District, Kingdom of Saudi
    • Authors: E. K. El-Sawy; A. Eldougdoug; M. Gobashy
      Abstract: Abstract In the present study, Al Ji’lani layered intrusion was subjected to integrated field, petrographic, processing of ASTER data, and geophysical investigations to delineate its subsurface extension and to determine the chronological order of the exposed rocks. The intrusion is surrounded by foliated granodiorite and both were intruded by younger granite. Processing of ASTER data revealed that the intrusion incorporated foliated granodiorite masses along its NE corner indicating its younger age (postorogenic) setting contrary to what have been proposed by previous authors. Also, this is further confirmed by the presence of an offshoot from the intrusion in the South-East corner as well as freshness and undeformed nature of the gabbroic rocks. Petrographically, the gabbroic rocks are characterized by the presence of kelyphytic coronas around olivine in contact with plagioclase, magnetite-orthopyroxene symplectites after olivine, and symplectites between plagioclase and magnetite/ilmenite. These textures are explained in terms of interaction with late deuteric magmatic fluids and not to metamorphism as believed before. The extensive geophysical analyses of the Al Ji’lani prospect using aeromagnetic data suggest complicated combination of magnetic bodies composed mainly of gabbroic rocks intruding the foliated granodiorite with variable magnetic susceptibilities. Gradient analysis, tilt angle and edge detection techniques extracted the shallow subsurface magnetic boundaries and a probable multiple bodies in the subsurface are detected. The 3-dimensional constraint inversion using parametrized trust region algorithm revealed the deep subsurface distribution of magnetic susceptibilities of the bodies. Two resolved bodies are clear, a northern more shallow body, and a southern, deeper and laterally extend to the south and southwest. The calculated volume from the inverted model representing the Al Ji’lani layered intrusion is approximately 518.7 km3 as calculated to 6.0 km depth. The body could be extended to a deeper depth if a different proposed model geometry is adjusted. The surface area of the exposed body is only 42.39 km2. Several magnetic anomalies are defined within the intrusion and are considered potential sites of mineralization. The south east corner of the gabbroic intrusion is traversed by a shear zone trending ENE-WSW which hosts sulfide-bearing quartz veins with high silver content (Samrah Prospect) associated with an offshoot from the layered gabbro. The shear zone should be followed to the west where the intrusion extends for a distance of about 10 km in the subsurface to the southwest of the exposed part of the intrusion.
      PubDate: 2018-01-12
      DOI: 10.1007/s12517-017-3368-3
      Issue No: Vol. 11, No. 2 (2018)
  • Gold deposits associated with the gabbroic rocks at Tirek area, western
           Hoggar, Algeria: fluid inclusion study
    • Authors: Warda Saad; Djamal Eddine Aissa; Koichiro Watanabe; Sachihiro Taguchi
      Abstract: Abstract The Tirek gold deposit hosted in the Archean shield is one of the richest sources of mined gold for Algeria. The deposit is controlled by the East Ouzzal shear zone (EOSZ), a transcurrent N–S lithospheric fault. The EOSZ is a late Pan-African dextral-ductile shear zone separating two contrasting Precambrian domains: the Archean In Ouzzal block to the west (Orthogenesis with subordinate metasediments reworked and granulitized during the ca. 2 Ga Eburnean event) and a middle Proterozoic block to the east involved in the ca. 600 Ma Pan-African event. The auriferous quartz veins are mainly oriented in two directions, N–S veins hosted in mylonitic rocks and NE–SW veins hosted in gabbroic or gneissic bands. The NE–SW veins contain the richest ore. Gold ore is found in a system of veins and lenticular quartz veinlets arranged in anastomosing networks. The hydrothermal alteration associated with these veins is characteristically a carbonate-sericite-albite-pyrite assemblage. Gold is the main metal of economic importance; it is disseminated in the quartz as grains or fibers along microcracks and as microscopic grains in the host rocks. Microthermometric results and Raman laser data from fluid inclusions demonstrate that the ore-forming fluids contained H2O-CO2±CH4 and were low salinity. Homogenization temperatures are commonly 250–310 °C. In the Tirek deposit, the role of the shear zone that hosts the mineralization was to drain the hydrothermal fluid. Interactions between the fluid and the mafic host rocks and CO2 also contributed to the formation of the hydrothermal gold deposit at Tirek.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3366-5
      Issue No: Vol. 11, No. 2 (2018)
  • Gold mineralization in Bubin area, Gilgit-Baltistan, Northern Areas,
    • Authors: Laeiq Ahmad; Shuhab D. Khan; M. Tahir Shah; Noor Jehan
      Abstract: Abstract The complex history of crustal evolution and the diverse geological history of Northern areas of Pakistan (i.e., Indian Plate, Kohistan-Ladakh Island arc, and Eurasian Plate) made the area most favorable for economic mineral deposits such as gold and copper. Sulfide-bearing mineralized rock samples from Ladakh terrane are analyzed for gold, silver, and base metals. Bulk samples analyses for gold, silver, and base metal concentrations demonstrate that almost all samples have variable amounts of gold, silver, and base metals. In these samples, gold concentration up to 95 ppm was found in chalcopyrite, galena-rich mineralized quartz veins, and their alteration products. The mineralized veins are few meters to 10 m wide and are associated with dioritic rocks. Dominant minerals in the mineralized zone include galena, chalcopyrite, limonite, pyrite, and malachite. The enrichment and depletion of different types of minerals suggest that the magmatic hydrothermal fluids played a key role in copper and lead mineralization with gold concentration. Study of ore minerals in these samples shows association with sulfide-bearing alterations in shear zones.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3354-9
      Issue No: Vol. 11, No. 2 (2018)
  • Investigation on mining-induced fractured zone height developed in
           different layers above Jurassic coal seam in western China
    • Authors: Shiliang Liu; Wenping Li; Qiqing Wang; Yabing Pei
      Abstract: Abstract The mining-induced fractured zone height (MIFZH) is of significant importance for water hazard prevention and regional eco-environmental conservation in the Jurassic coal field of western China. The paper discussed MIFZH developed in bedrock and Neogene laterite from two aspects of field measurement and theoretical analysis respectively. In theoretical analysis of MIFZH developed in bedrock, based on plate and shell theory, each stratum in bedrock above the coalface stress-decreasing zone was simplified as four clamped rectangular plates, and the value of the ultimate deflection of the thin plate and the height of the free space in the lower part of the stratum were compared to judge MIFZH. When MIFZH was developed in Neogene laterite, MIFZH was calculated by Pu’s theory and rock mass limit equilibrium theory in theoretical analysis; in on-site measurement, micro resistivity scanning imaging logging technology (MRSILT), overcoming the shortage of fluid leakage technology, was adopted to detect MIFZH, where its measured result proved the feasibility of theoretical analysis. The research results have important significance to water conservation mining and safety mining of the Jurassic coal seam in western China.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-018-3383-z
      Issue No: Vol. 11, No. 2 (2018)
  • Linkage of urban expansion and land surface temperature using geospatial
           techniques for Jaipur City, India
    • Authors: Suresh Chandra; Devesh Sharma; Swatantra Kumar Dubey
      Abstract: Abstract The aim of this study is to understand the land use change and urban expansion of Jaipur City of Rajasthan (India). Landsat 5 TM and Landsat 8 OLI satellite data of 4 years, i.e., 1993, 2000, 2010, and 2015 are used for land use and land surface temperature (LST) analysis. ERDAS Imagine and ArcGIS software are used to conduct the analysis. Urban settlement increased from 13.5 to 57.3% in the study period. Open land is mainly changed to urban areas. Urban settlement is also expanded to peri-urban area of Jaipur City. Jaipur City expanded along three directions i.e., north, west, and south and less development is found in the east direction. Based on radial analysis, it is observed there is not much development within the periphery of 2 km (close to city center) but maximum growth is observed within the distance from 4 to 6 km radius of city center. Expansion intensity was observed highest in the period 2015–2010 from 6 km onwards and reached to a maximum value close to 17 km2/year. In LST analysis, there is less change in extreme temperature, but more areal increase in average temperature range (30–35 °C). Urbanization is the main driving process of land cover changes and consequently changes in LST.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3357-6
      Issue No: Vol. 11, No. 2 (2018)
  • Identification of morphogenetic regions and respective geomorphic
           processes: a GIS approach
    • Authors: Arjun Doke; Sudhakar D. Pardeshi; Suchitra S. Pardeshi; Sumit Das
      Abstract: Abstract Regional study of any geographic or geomorphic phenomena is essential in different aspects such as understanding the region, resource management, and application of the knowledge for the regional development. Understanding the physical set up of these regions is the basis of such regional assessment. In the same context, identification of morphogenetic region(s) is of interest to the geoscientists, geotechnical experts, and planners. Regional setup with respect to morphogenetic regions is not well studied in many parts of the world. The present study is carried out to understand the morphogenetic regions of Maharashtra State in India, to know the characteristics of each morphogenetic region with reference to the climatic conditions prevailed over a long time and processes operated in the region. In order to understand the climatic conditions, the climate data for 63 years (1951–2013) in the grid format has opted for analysis. The elevation data is extracted by using SRTM Digital Elevation Model (DEM) of 30 m spatial resolution. Using these datasets in GIS platform, primary morphogenetic regions for Maharashtra State have been identified. These regions are further characterized with the help of denudational processes such as weathering and their types, erosion, and mass movement which play a dominant role in those morphogenetic regions. Based on the analysis carried out, five morphogenetic regions are identified as selva, maritime, moderate, savanna, and semi-arid regions, covering the entire Maharashtra State.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3358-5
      Issue No: Vol. 11, No. 2 (2018)
  • Permeability of granular soil employing flexible wall permeameter
    • Authors: Srikanth Kandalai; Purnendu Narayan Singh; Kunal Kumar Singh
      Abstract: Abstract Understanding the changes in permeability of soil, when soil is subjected to high confining pressure and flow pressure, which may alter the textural and geomechanical characteristics of soil, is of great importance to many geo-engineering activities such as, construction of high-rise buildings near the coast or the water bodies, earthen dams, pavement subgrades, reservoir, and shallow repositories. It is now possible to evaluate the changes in permeability of soil samples under varying conditions of confining pressure and flow pressure using flexible wall permeameter (FWP). In the present study, investigation was carried out on a cylindrical sample of granular soil employing FWP under varied conditions of confining pressure (σ3)—50–300 kPa, which can simulate the stress conditions equivalent to depth of about 20 m under the earth’s crust, and a flow pressure (fp)—20–120 kPa, which is mainly present near the small earthen embankment dams, landfill liners, and slurry walls near the soft granular soil with high groundwater table. The obtained results indicate a linear relationship between hydraulic conductivity (k) with effective confining pressure (σeff.), k, decreasing linearly with an incremental change in σeff.. Further, k increases significantly with an increase in fp corresponding to each σeff., and q increases significantly with increase in the fp corresponding to each (σ3). It was also observed that corresponding to the low fp of 20 kPa, the reduction in k is nonlinear with σ3. The percentage reduction in k is observed to be 9, 13, and 27% corresponding to σ3 of 50–100, 100–200, and 200-300 kPa, respectively.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3352-y
      Issue No: Vol. 11, No. 2 (2018)
  • Contamination levels and vertical distribution of trace metals with
           application of geochemical indices in the sediment cores of the Bizerte
           Lagoon-Ichkeul lake complex in northeastern Tunisia
    • Authors: Bochra Brik; Abdelwaheb Aydi; Chadia Riahi; Ali Sdiri; Kamel Regaya
      Abstract: Abstract The “Bizerte Lagoon-Ichkeul Lake complex” represents an ecosystem where the Tinja channel connected the Ichkeul Lake to the Bizerte lagoon. For a rigorous environmental assessment of pollution status, 17 core samples were collected in the complex area. The main purpose was to follow vertical distribution of trace metals and evaluate their potential contamination levels via an integrated geochemical approach. The collected samples were subjected to physicochemical characterization by several analytical techniques. Our results indicated that the mean concentrations of Cd, Cu, Pb, Mn, Zn, and Fe reached 2.31, 2.23, 33.22, 100.88, 40.79, and 605.05 mg/kg, respectively. They followed the order of Fe > Mn > Zn > Pb > Cd > Cu. The highest metal concentrations were found in samples close to industrial and urban areas transferred via the surrounding rivers. Those concentrations were lower than the effects range low (ERL), the effects range median (ERM), the threshold effect level (TEL), and the probable effect level (PEL), except for Cd and Pb. In addition, measured enrichment factor (EF), the geo-accumulation index (Igeo), and contamination factor (CF) proved the anthropogenic origin of all the potentially toxic metals studied. A low contamination for Cu, Mn, Zn, and Fe combined with very high contamination levels of Cd and Pb further confirmed the high anthropogenic input.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3382-5
      Issue No: Vol. 11, No. 2 (2018)
  • The development of attenuation relationship for Northwest Anatolia region
    • Authors: Ayfer Erken; Gülçin Şengül Nomaler; Zeki Gündüz
      Abstract: Abstract Ground-motion attenuation relationships using the 1999 Kocaeli earthquake data were developed for the Northwest Anatolia region. This region is seismically active due to its location on Northwest Anatolia Fault Zone and was affected by the 1999 Kocaeli and Düzce earthquakes. Properties of the investigated stations and strong ground-motion data were taken from the Strong Ground Motion Database of Turkey (2017) (TR-NSMN) and Pacific Earthquake Engineering Research Center-Enhancement of Next Generation Attenuation Relationships for Western US (PEER-NGA-West2) database. SeismoSignal software was used in the evaluation of the acceleration records measured in the stations. A generated database for this study contains 369 mainshock and aftershock records, which occurred in the region of 39.39 to 41.03 North (N)/26.04 to 31.73 East (E) coordinates between the years of 1999 (Kocaeli earthquake) and 2006. In this research, peak ground acceleration is greater than 1 gal, and moment magnitude (M W ) is greater than 4.0 and Joyner-Boore distance (R JB ) is 1–344 km. These records were taken from 76 stations located in the investigation area. In addition to these data, 33 mainshock records worldwide were used for recovery of regression coefficients. Therefore, total of 402 data were used in this research. Attenuation relationships obtained from different types of ground were derived from the model generated by Boore et al. (Seismol Res Lett 68(1):128–153, 1997) for shallow earthquakes in North America. In this study, attenuation relation equations were developed by applying nonlinear regression analysis, with Statistical Package for the Social Sciences (SPSS) Statistics 20.0 software for B-C and D class soil according to the National Earthquake Hazards Reduction Program (NEHRP) classification system.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3359-4
      Issue No: Vol. 11, No. 2 (2018)
  • Petrology of calc-alkaline/adakitic basement hosting A-type Neoproterozoic
           granites of the Malani igneous suite in Nagar Parkar, SE Sindh, Pakistan
    • Authors: M. Qasim Jan; Amanullah Laghari; M. Asif Khan; M. Hassan Agheem; Tahseenullah Khan
      Abstract: Abstract The Nagar Parkar area contains three distinct groups of rocks, from oldest to youngest, (1) basement rocks ranging in composition from mafic to (quartz)diorite, tonalite, granite, and younger granodiorite, (2) granite plutons similar in general features to those of the Malani Igneous Suite of Rajasthan, and (3) abundant mafic, felsic and rhyolitic dykes. The basement rocks show strong brittle and local plastic deformation, and epidote amphibolite/upper greenschist facies metamorphic overprint. The chemistry of the basement rocks contrasts the commonly agreed within plate A-type character of the Neoproterozoic granites (group 2) that are emplaced into them. The basement rock association is calc-alkaline; the granodiorite displays the compositional characteristics of adakites, whereas the tonalite has intermediate composition between typical adakite and classical island arc rocks. This paper presents detailed petrography of the basement rocks and compares their geochemistry with those of the group 2 granites as well as with rocks from other tectonic environments. It is proposed that the Nagar Parkar basement is part of a 900–840 Ma magmatic arc that was deformed before it was intruded 800–700 Ma ago by the A-type continental granitic rocks followed by mafic to felsic dykes.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3378-1
      Issue No: Vol. 11, No. 2 (2018)
  • Damage constitutive model and variables of cracked rock in a
           hydro-chemical environment
    • Authors: Shengjun Miao; Hui Wang; Meifeng Cai; Yuanfang Song; Jintao Ma
      Abstract: Abstract The mass of underground rock was continuously influenced by the physical, mechanical, and chemical effects of seepage flow. The interaction of water and rock is now a research subject at the forefront in geotechnical engineering in fields as diverse as nuclear waste disposal, dam foundation construction, tunnelling, slope dynamics, and mineral resource utilization. The multiple coupling processes and mechanisms within the stress, seepage, and chemical domains of the rock mass in a hydro-chemical environment are analyzed. Based on fracture and general damage mechanics, a constitutive model using variables of the cracked rock under uniaxial compression and chemical solution erosion was established, and the rock damage represented by the porosity resulting from the hydro-physicochemical interaction is deduced. When compared with the results of uniaxial compression tests and porosity measurements of granite specimens treated with acidic chemical solutions, the constitutive model is seen to be in good agreement with stress-strain curves of granite under uniaxial compression and thus appropriate for describing the progressive rock damage that occurs under chemical erosion. The damage may be represented as the hydro-physicochemical damage level of the rock. Then, based on the damage constitutive model and expression pattern, a numerical simulation that takes into consideration the hydro-chemical damage effect shows that the variation in seepage in the deep mining of the Sanshandao Gold Mine is continuously expanding and exerts a great influence on the stability of the rock mass.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3373-6
      Issue No: Vol. 11, No. 2 (2018)
  • Microfacies analysis and diagenetic fabric of the Lockhart Limestone
           exposed near Taxila, Margalla Hill Range, Punjab, Pakistan
    • Authors: Mohibullah Khan; Mumtaz Ali Khan; Birkhez Aslam Shami; Muhammad Awais
      Abstract: Abstract The microfacies analysis and diagenetic fabric of the Lockhart Limestone are studied in an outcrop section exposed in the Margalla Hill ranges. The Lockhart Limestone is predominantly composed of medium to thick bedded, nodular and occasionally brecciated, highly fossiliferous limestone with thin interbeds of marl and shale. On the basis of detailed petrographic investigations, four microfacies have been identified including bioclastic packstone, wackestone (siliciclastic bioclastic rich sub-microfacies), wackestone-packstone, and mud-wackestone. Based on the microfacies analysis, the Lockhart Limestone is interpreted to have been deposited in the fore-shoal mid-ramp, mid-ramp, and outer ramp depositional environments. The Paleocene age has been assigned to the Lockhart Limestone based on age diagnostic foraminifera, i.e., Miscellanea, Lockhartia, and Ranikothalia. The diagenetic fabric of the Lockhart Limestone is characterized by several diagenetic features such as micritization, neomorphism (aragonite to calcite transformation and development of microspar), compaction, pressure dissolution (microstylolites), and cementation (calcite-filled microfractures). Such diagenetic features are developed in marine, meteoric, and burial diagenetic settings. The Paleocene Lockhart Limestone of Pakistan shows analogous features to that of the Paleocene Zongpu Formation (Member-3) of the Gamba-Tingri Basin of southern Tibet based on the outcrop features, microscopic fabric, and depositional environment.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3367-4
      Issue No: Vol. 11, No. 2 (2018)
  • Surface irrigation performance of date palms under water scarcity in arid
           irrigated lands
    • Authors: Zied Haj-Amor; Henk Ritzema; Hossein Hashemi; Salem Bouri
      Abstract: Abstract In this paper, a study on the performance of surface irrigation of date palms in a Tunisian arid area (Douz oasis) is presented. The study is conducted in 16 plots with various sizes and soil textures over a 4-year period (2012–2015). In the first step, an assessment of total water requirements of the date palms is carried out. Then, the surface irrigation performance is analyzed using three indicators, i.e., the relative water supply (RWS) indicator, the uniformity index of water distribution (D U ), and the water application efficiency (E a ). Finally, the irrigation management problems are identified. The results indicate that in the arid Tunisian Saharan oases, the soil texture, plot size, and farmers’ practices (especially irrigation duration) have significant effects on surface irrigation performance. The average annual net irrigation requirements of date palms are about 2400 mm. The RWS increases from 1.8 in the smaller plots (0.5 ha) to 3.6 in the largest plots (2.5 ha), implying that the increase in the plot size requires an excessive water supply. D U decreases from 80.7 in the 0.5 ha plots to 65.4 in the 2.5 ha plots; however, no significant difference in the E a is observed. The results show that the soil texture has no influence on the RWS and D U , but the E a is significantly higher in the loamy-sand soils (46.7%) compared to the sandy soils (36.3%). Overall, RWS indicator is higher than 1 (RWS = 2.6) implying excessive irrigation supply to the system. Although D U is relatively uniform (> 60%), E a is relatively low (< 50%) indicating that the current irrigation management is inefficient. These findings have a paramount importance for improving irrigation water management in the Tunisian Saharan oases.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3374-5
      Issue No: Vol. 11, No. 2 (2018)
  • Sustainable harnessing of the surface water resources for Karachi: a
           geographic review
    • Authors: Muhammad Irfan; Syed Jamil Hasan Kazmi; Mudassar Hassan Arsalan
      Abstract: Abstract Water resource management has now become the most important challenge in developing countries, especially, in an arid part of the world. In the case of Karachi city, the situation is getting worse day by day due to haphazard urban development, climate change, and an inadequate supply of fresh water. This paper reviews various published research articles and reports regarding Karachi water resources, supply, and demand. The city of over 20 million people has scarce local water resources and imports most of its required water from Indus and Hab Rivers. The city is undersupplied as its rationalized water demand is around 1250 million gallons per day (mgd), while receiving only 650 mgd. Another water source, Hab Dam, which is planned to supply 100 mgd water to the city, is highly uncertain due to intermittent drought conditions in the region. The mega city is facing a water scarcity problem very seriously because of the phenomenal growth of the population and the shortage of a water supply. Subsurface geology and surface topography are favorable to store water in dams and recharge the aquifers. However, over-extraction of water, scarcity of rainfall, sand and gravel excavation, and lack of groundwater recharge infrastructure have depleted the precious resource. There is an urgent need for a comprehensive city development master plan for future growth of the city with clear-cut priorities, policies, and implementation framework. Water sector should holistically be addressed by considering climate change, rapid urbanization, population growth, and perpetual increasing demand from all sectors including industries and agriculture. Besides the development of sustainable policies at the local government level, overall governance, administration, and management need to be improved which may implement the best practices and regulations.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3365-6
      Issue No: Vol. 11, No. 2 (2018)
  • Geochronology and geochemistry of Ediacaran volcanic rocks of the
           Tighardine ore deposit formation (western High Atlas, Morocco)
    • Authors: Salah Boukerrou; Herminio Nalini; Hugo Moreira; Lhou Maacha; Mohamed Zouhair; Mohamed Outhounjite; Said Ouirouane; Mohamed Hibti; Ahmed Touil
      Abstract: Abstract The study performed on the host rocks of the Tighardine deposit allows proposing a new lithostratigraphic succession, mainly constituted of three volcanic and volcano–sedimentary units and dolomitic bed and lenses. Volcanic rocks consist mainly of basalt, andesite, and less common dacites. They are characterized by a FeO/MgO ratio range of 0.8–10.0, TiO2 contents ranging between 0.6 and 3.2 wt%, and high values of Zr/Y (7.1 to 9.9), Nb/Y (0.5 to 1.1), and Nb/La (0.7 to 1.1) ratios, providing good evidence of intracontinental tholeiitic character with a subalkaline affinity. They have no Nb anomaly and high Ti/Yb ratios (> 4000), suggesting their derivation from an enriched source and emplacement in an extensional continental setting. Fractional crystallization is the main differentiation mechanism of these rocks, and crustal contamination may have contributed to their final geochemical signature. U/Pb dating these volcanic rocks revealed ages of 603.5 ± 3.3 and 596.1 ± 3.3 Ma. These early Ediacaran ages chronologically correlate to the age of the Lower Ouarzazate Supergroup located in the Precambrian area of the Moroccan Anti-Atlas. The Tighardine formations underwent superimposed polyphase metamorphism. Mineralogical investigations show evidence of local intense thermal metamorphism and hydrothermalism evidenced by andalusite and cordierite in pelites; diopside, tremolite, and actinolite in dolomite; and by actinolite in volcanic rocks. Late brown biotite may overgrow early metamorphic minerals in all facies. Hydrothermal transformation is particularly confined in the crossings of N–S and N70 to E–W faults. The local thermal metamorphism and hydrothermalism result from a hypothetical granitic intrusion at depth. The early disseminated polymetallic mineralization (Cu–Pb–Zn) is confined in the Ediacaran volcanic and volcanosedimentary formation of Tighardine. This volcanic activity contributes to the genesis of the Tighardine ore deposit. The economic ore deposit is related to the recrystallization and brecciation of this early-disseminated polymetallic mineralization, during the Variscan event or later.
      PubDate: 2018-01-11
      DOI: 10.1007/s12517-017-3375-4
      Issue No: Vol. 11, No. 2 (2018)
  • Estimation of site effect using microtremor technique at 15th May City,
           Helwan, Egypt
    • Authors: M. A. Mohammed; A. M. Abudeif; K. A. Omar; M. M. Attia
      Abstract: Abstract Local site effect is an important feature of seismic hazards, which often causes amplification of ground motions and results in increasing the damage potential of earthquake. This paper presents an experimental study of microtremor data to investigate the dynamic characteristics of soil and structures at the 15th May City, southeast Cairo, Egypt. This city was constructed on Eocene sedimentary rocks of mainly limestone. Despite the newness of this city, their buildings suffer from structural damages, which mainly developed over the last two decades. Predicting the reasons of structural damage caused by earthquakes (including micro-earthquakes) is considered and became the main target of this study. The horizontal vertical spectral ratio (HVSR) analyses of ambient noise data at 54 sites were processed and interpreted using Geopsy Software to calculate the amplification factor and fundamental resonance frequency of each observation point. Three tests including the damping value, the horizontal spectrum rotate, and H/V rotate were undertaken to ensure that the peaks of spectral ratio are either natural or artificial origin. The vulnerability index (Kg) was estimated based on Nakamura’s technique for assessing the seismic vulnerability index (SVI). The results indicate that the resonance frequency ranges between 1.36 and 1.607 Hz at the most measured stations, but it attained higher value up to 11 Hz at sites having high thicknesses of soft sediments. The lowest resonance frequencies occur in the areas of the deepest bedrock, whereas the higher resonance frequencies were observed in the areas of shallowest bedrock. The amplification factor ranges between 1.09 and 3.61 at most measured stations, but it became greater up to 5 in few locations. The northern west part of the area has thick soft sediments and may be more affected by earthquake damage because it contains SVI values ranging from 6.5 to 8.5, in consistent with the amplification factor and fundamental frequency results, while the other parts of the area are relatively safe because they contain low SVI values (0.5–4.3).
      PubDate: 2018-01-10
      DOI: 10.1007/s12517-017-3348-7
      Issue No: Vol. 11, No. 2 (2018)
  • Deep-hole water injection technology of strong impact tendency coal
           seam—a case study in Tangkou coal mine
    • Authors: Zhigang Liu; Anye Cao; Xiaosheng Guo; Jinxiu Li
      Abstract: Abstract The implementation of coal-seam water injection can change the physical and mechanical properties of coal, can improve the coal storage limit, prevent and control rock burst, prevent coal and gas outburst, and reduce dust concentration in underground operations. However, there are still many shortcomings such as the poor sealing effect and the lack of coal seam permeability. In order to study coal softening through water injection and its effect of reducing the coal’s impact tendency, we examine the impact tendency, coal seam injection, water injection additive, water injection hole sealing, and coal seam stress-relief effect of coal seam on LW5304 experimentally and through engineering application. The results show that this method can be used to reduce the coal’s impact tendency, if the samples are soaked. Triton X-100 additive can effectively reduce the polarity of water and the surface tension, while improving the coupling effect of water and coal and the wettability of coal. The “pure polyurethane + cement slurry + cement mortar” sealing process can be used to avoid water injection leaking. The water content of LW5304 coal seam is 3.2~4.2% after water injection, and the average increase of moisture content is 1~2.5%. In addition, the number of coal-stress early warning is reduced, and micro-seismic monitoring shows that the average energy is reduced as well. Therefore, water injection in coal seam is considered a good method for relieving stress.
      PubDate: 2018-01-10
      DOI: 10.1007/s12517-017-3381-6
      Issue No: Vol. 11, No. 2 (2018)
  • Paleoenvironmental and paleoclimatic conditions during the deposition of
           the bauxite layer (Upper Cretaceous) using multi-proxy geochemical and
           palynological analyses, in the Zabirah Area, Northern Saudi Arabia
    • Authors: Madyan M.A. Yahya; Mohammed H. Hakimi; Mahmoud A. Galmed; Mohamed N. El-Sabrouty; Yasamin K. H. Ibrahim
      Abstract: Abstract In this research, Cretaceous claystones in the Az Zabirah area, Northern Saudi Arabia were evaluated to investigate the paleoenvironmental and paleoclimatic conditions during deposition of the claystone sediments. Outcrop samples of claystone from the bauxite zone profile in the Az Zabirah area were analyzed using multi-proxy geochemical and coupled with palynological analysis. Palynological analysis suggested that the age of the Az Zabirah claystones is Maastrichtian of Upper Cretaceous. This evidence is valid due to the presence of microspore taxa Gabonisporis sp. The Az Zabirah claystones have abundant angiosperm taxa, indicating a large terrestrial influx in the interval of the claystone. This finding is confirmed from geochemistry of major and trace elements and mineral compositions. The high concentration of terrestrial detritus oxides, such as SiO2, Al2O3, and TiO2, infers that the Az Zabirah claystones were sourced from terrigenous origin. This is consistent with a significant amount of quartz and kaolinite in the Az Zabirah claystones. The claystones could be deposited under oxic paleo-redox and warm-humid with little aridity climatic conditions. This is indicated by their concentration of the trace element concentrations along with their geochemical ratios. Warm-humid climate condition is also largely supported by the presence of a significant amount of kaolinite.
      PubDate: 2018-01-10
      DOI: 10.1007/s12517-017-3379-0
      Issue No: Vol. 11, No. 2 (2018)
  • Assessing groundwater hydrochemistry of Malwa Punjab, India
    • Authors: Chetan P. S. Ahada; Surindra Suthar
      Abstract: Abstract This study investigates the groundwater hydrochemistry (pH, EC, TDS, TH, SO42−, PO43−, NO3−, Na2+, K+, Mg2+, Ca2+, F− and Cl−) of intensively cultivated belt of Malwa Punjab, India. The groundwater was collected from 76 representative sites and analysed for different parameters. Results suggested that in the majority of locations, the TH, TDS, K+, Mg2+, Ca2+ and Cl− were within the limit as decided by Bureau of Indian Standards (BIS) for drinking purposes. The proportion of SO42− and PO43− was SO42− > PO43− mg/L in the majority of sampling locations. The Na+ was recorded in a high range 26.05 to 735.5 mg/L indicating Na-rich groundwater in this area. Fluoride ranged 1.59 to 5.07 mg/L in this region, higher than the than permissible range (1.5 mg/L). The NO3− was prominent anthropogenic mineral in groundwater. The suitability of groundwater for drinking and irrigation purposes was also calculated. The water quality index (WQI) suggests that about 80.3% sites have low quality water, unsuitable for drinking purposes. The suitability of groundwater for irrigation purposes was evaluated using SAR and LSI value, which revealed that in the majority of areas, the groundwater is unfit for surface irrigations. This study revealed that overall groundwater of Malwa Punjab is not suitable for drinking as well as agricultural purposes due to excess of some natural and anthropogenic chemicals. The long-term uses of such water could pose serious soil and human health issues in this regions.
      PubDate: 2018-01-10
      DOI: 10.1007/s12517-017-3355-8
      Issue No: Vol. 11, No. 2 (2018)
  • Record of calcareous algae from the Lameta Formation: a new insight for
           possible sea incursion during the Maastrichtian time
    • Authors: Ashok K. Srivastava; Neelam K. Kandwal; Sumedh K. Humane; Samaya S. Humane; P. Kundal; N. Khare
      Abstract: Abstract The Lameta Formation exposed in central and western India is traditionally considered as deposits of fluvio-lacustrine environment except for the type area having a few reports of shallow marine setting. The present work records the fossilization of calcareous algae from a discontinued bed of limestone preserved in argillaceous unit of Lameta succession. Taxonomical study of algal biota places them mostly in chlorophyta, charophyta, and rhodophyta divisions. These algae are being reported for the first time from Lameta sediments of a newly identified inland basin of deposition, viz., Salbardi-Belkher. Considering the paleoecological significance of presently recorded algae, a marine incursion has been interpreted which might have taken place through the Narmada-Tapti Rift Zone during the Maastrichtian time.
      PubDate: 2018-01-10
      DOI: 10.1007/s12517-017-3333-1
      Issue No: Vol. 11, No. 2 (2018)
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