Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)                  1 2 3 | Last

Showing 1 - 200 of 371 Journals sorted by number of followers
Nature Geoscience     Full-text available via subscription   (Followers: 165)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 151)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 145)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 145)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 134)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Marine Policy     Hybrid Journal   (Followers: 61)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
Geochimica et Cosmochimica Acta     Hybrid Journal   (Followers: 54)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
Natural Hazards     Hybrid Journal   (Followers: 53)
Journal of Earth System Science     Open Access   (Followers: 52)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 44)
Hydrological Processes     Hybrid Journal   (Followers: 44)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (Followers: 41)
Geophysical Journal International     Hybrid Journal   (Followers: 40)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Groundwater     Hybrid Journal   (Followers: 37)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Geomorphology     Hybrid Journal   (Followers: 33)
Chemical Geology     Hybrid Journal   (Followers: 31)
Marine Geology     Hybrid Journal   (Followers: 31)
Geology Today     Hybrid Journal   (Followers: 31)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Reviews of Modern Physics     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geology     Full-text available via subscription   (Followers: 30)
Coastal Management     Hybrid Journal   (Followers: 29)
Advances In Physics     Hybrid Journal   (Followers: 29)
GPS Solutions     Hybrid Journal   (Followers: 28)
Bulletin of the Seismological Society of America     Full-text available via subscription   (Followers: 26)
Landslides     Hybrid Journal   (Followers: 26)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Quaternary Science Reviews     Hybrid Journal   (Followers: 26)
Ground Water Monitoring & Remediation     Hybrid Journal   (Followers: 25)
Geoforum     Hybrid Journal   (Followers: 25)
Earth Surface Processes and Landforms     Hybrid Journal   (Followers: 25)
Environmental Geology     Hybrid Journal   (Followers: 25)
Tectonophysics     Hybrid Journal   (Followers: 24)
Geocarto International     Hybrid Journal   (Followers: 23)
Coral Reefs     Hybrid Journal   (Followers: 22)
Bulletin of Volcanology     Hybrid Journal   (Followers: 22)
Hydrogeology Journal     Hybrid Journal   (Followers: 21)
Hydrobiologia     Hybrid Journal   (Followers: 21)
Tellus A     Open Access   (Followers: 21)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Water Resources     Hybrid Journal   (Followers: 21)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Earthquake Spectra     Hybrid Journal   (Followers: 20)
Tellus B     Open Access   (Followers: 20)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Sedimentary Geology     Hybrid Journal   (Followers: 20)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (Followers: 19)
Geophysics     Full-text available via subscription   (Followers: 19)
Quaternary Research     Full-text available via subscription   (Followers: 19)
Geological Journal     Hybrid Journal   (Followers: 19)
Global and Planetary Change     Hybrid Journal   (Followers: 18)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
African Journal of Aquatic Science     Hybrid Journal   (Followers: 17)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Geological Magazine     Hybrid Journal   (Followers: 16)
The Holocene     Hybrid Journal   (Followers: 16)
Atmosphere-Ocean     Full-text available via subscription   (Followers: 16)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Sedimentology     Hybrid Journal   (Followers: 15)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Applied Geochemistry     Hybrid Journal   (Followers: 14)
Quaternary International     Hybrid Journal   (Followers: 14)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Pramana     Open Access   (Followers: 13)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 13)
Electromagnetics     Hybrid Journal   (Followers: 13)
Ocean Modelling     Hybrid Journal   (Followers: 12)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Frontiers of Earth Science     Hybrid Journal   (Followers: 12)
Continental Shelf Research     Hybrid Journal   (Followers: 12)
Computers and Geotechnics     Hybrid Journal   (Followers: 12)
Arctic, Antarctic, and Alpine Research     Open Access   (Followers: 12)
Pure and Applied Geophysics     Hybrid Journal   (Followers: 12)
CATENA     Hybrid Journal   (Followers: 11)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Applied Geophysics     Hybrid Journal   (Followers: 11)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Cretaceous Research     Hybrid Journal   (Followers: 10)
Earth Interactions     Open Access   (Followers: 10)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (Followers: 10)
Bulletin of Earthquake Engineering     Hybrid Journal   (Followers: 10)
Gondwana Research     Hybrid Journal   (Followers: 10)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Journal of Seismology     Hybrid Journal   (Followers: 9)
Physik in unserer Zeit     Hybrid Journal   (Followers: 9)
Lithos     Hybrid Journal   (Followers: 9)
Limnology     Hybrid Journal   (Followers: 9)
Acta Geophysica     Hybrid Journal   (Followers: 9)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Geotectonics     Hybrid Journal   (Followers: 9)
Facies     Hybrid Journal   (Followers: 9)
Comptes Rendus : Geoscience     Open Access   (Followers: 9)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards     Hybrid Journal   (Followers: 8)
Geophysical & Astrophysical Fluid Dynamics     Hybrid Journal   (Followers: 8)
Natural Resources Research     Hybrid Journal   (Followers: 8)
Geobiology     Hybrid Journal   (Followers: 8)
Quaternary Geochronology     Hybrid Journal   (Followers: 8)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (Followers: 8)
Geophysical Prospecting     Hybrid Journal   (Followers: 7)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Physics of the Solid State     Hybrid Journal   (Followers: 7)
Plasma Physics Reports     Hybrid Journal   (Followers: 7)
Precambrian Research     Hybrid Journal   (Followers: 7)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Petrology     Full-text available via subscription   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Geochemistry : Exploration, Environment, Analysis     Hybrid Journal   (Followers: 6)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Geo-Marine Letters     Hybrid Journal   (Followers: 6)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Applied Ocean Research     Hybrid Journal   (Followers: 6)
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 6)
Chinese Geographical Science     Hybrid Journal   (Followers: 6)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Resource Geology     Hybrid Journal   (Followers: 6)
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
Island Arc     Hybrid Journal   (Followers: 5)
Geofluids     Open Access   (Followers: 5)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Geochemistry     Hybrid Journal   (Followers: 5)
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Zeitschrift für Geomorphologie     Full-text available via subscription   (Followers: 5)
Terra Nova     Hybrid Journal   (Followers: 5)
Energy Exploration & Exploitation     Open Access   (Followers: 4)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Geostandards and Geoanalytical Research     Hybrid Journal   (Followers: 3)
Surveys in Geophysics     Hybrid Journal   (Followers: 3)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Russian Geology and Geophysics     Hybrid Journal   (Followers: 3)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
JETP Letters     Hybrid Journal   (Followers: 3)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Geomagnetism and Aeronomy     Hybrid Journal   (Followers: 3)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Zeitschrift der Deutschen Gesellschaft für Geowissenschaften     Full-text available via subscription   (Followers: 3)
Stratigraphy and Geological Correlation     Full-text available via subscription   (Followers: 2)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Rocks & Minerals     Hybrid Journal   (Followers: 2)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Polar Record     Hybrid Journal   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
Helgoland Marine Research     Open Access   (Followers: 2)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Studia Geophysica et Geodaetica     Hybrid Journal   (Followers: 1)
The Leading Edge     Hybrid Journal   (Followers: 1)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Doklady Physics     Hybrid Journal   (Followers: 1)
Russian Physics Journal     Hybrid Journal   (Followers: 1)
Reports on Mathematical Physics     Full-text available via subscription   (Followers: 1)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Russian Journal of Pacific Geology     Hybrid Journal  
Russian Journal of Mathematical Physics     Full-text available via subscription  
Physics of Wave Phenomena     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Moscow University Geology Bulletin     Hybrid Journal  
Marine Georesources & Geotechnology     Hybrid Journal  
Journal of Mountain Science     Hybrid Journal  
Grassland Science     Hybrid Journal  
Erwerbs-Obstbau     Hybrid Journal  
Bulletin of the Lebedev Physics Institute     Hybrid Journal  

        1 2 3 | Last

Similar Journals
Journal Cover
Geotectonics
Journal Prestige (SJR): 0.773
Citation Impact (citeScore): 1
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1556-1976 - ISSN (Online) 0016-8521
Published by Springer-Verlag Homepage  [2469 journals]
  • Early Oligocene Continental Alkalibasalts of the Central Toveireh Area
           (Southwest of Jandaq, Isfahan Province, Iran)

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      Abstract: The Early Oligocene alkalibasalts exposed in the Central Toveireh area located in the southwest of Jandaq city in Isfahan Province (Iran) and northwest of the Central-East Iranian Microcontinent (CEIM). Field studies reveal that these alkalibasalts crosscut the Eocene calc-alkaline volcanic rocks and granitoids and covered by the Miocene sedimentary rocks. The basaltic magma rose to the surface along the local faults. Based on the petrography, these alkalibasalts are composed of major minerals of olivine and plagioclase, and minor minerals of clinopyroxene, sanidine, Cr-spinel, and magnetite. The microscopic textures are porphyritic, microlithic porphyritic, trachytic, anti-rapakivi, corona, sieved texture, and poikilitic. Olivines are forsterite and chrysolite (Fo 0.90–0.75), plagioclases are labradorite to oligoclase (An63.1–20.7), alkali-feldspars are sanidine (Or50.3–61.5), clinopyroxenes are diopside and augite (Mg# 0.79 to 0.87), and Cr-spinels are hercynite (Cr# 0.24 to 0.25) in chemical composition, spinels (Mg# 0.72 to 0.76) are present as xenocrysts in some samples. The average contents of SiO2 and TiO2 of these rocks are 48.96 and 1.54 (wt %), respectively. The chondrite and primitive mantle-normalized diagrams characterized by enriched LREE relative to HREE, LILE enrichment, and absence of evident Eu anomaly. The normative content of nepheline reaches up to 14.6%. Modal and normative mineralogy, as well as geochemical data of minerals and whole rocks revealed that these rocks are sodic to highly sodic alkalibasalts formed in a within-plate continental tectonomagmatic setting after the cessation of subduction. The whole-rock chemical data indicate that the Central Toveireh alkalibasalts probably formed by relatively medium degrees of partial melting of an amphibole-bearing garnet lherzolite from the asthenospheric mantle of about 105 km in depth, which was previously enriched by subduction of the Neo-Thetyan slab.
      PubDate: 2022-04-29
       
  • Multi-Parametric Geophysical Observatory for Earthquake Precursory
           Research in Assam Valley, Eastern Himalaya (India): Seismotectonic
           Features of Kopili and Bomdila Faults

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      Abstract: The study of earthquake precursor is being accomplished throughout the world based on observations of ground and ionospheric parameters. The Multiparametric Geophysical Observatory (MPGO), Ouguri Hills, Tezpur (Eastern Himalaya) is an avenue for identification of earthquake precursor. In the article we discuss on the seismic induced ground as well as ionosphere based precursory phenomena in the different geophysical parameters. Apart from seismic induced perturbation there exist perturbations due to inter-planetary, terrestrial, hydrological, and tectonic sources. Statistical, mathematical techniques and models are applied to discriminate the extraneous noises for identification of the seismic induced anomalies. Earthquake precursory phenomena can be correlated to deformation occurring close to fault preceding the main shock. There are evidences that seismic induced anomalies in physical sense to be actual. The present investigation also evince that seismic induced anomalies in geophysical parameters are persuasively real in the sense that these are physically related to the preparation and generation processes of imminent seismic activity. The Multiprametric Geophysical Observatory in Ouguri Hills (Tezpur) is an opportunity for better scrutinizing seismic precursor from long term temporal observations of the parameters.
      PubDate: 2022-04-29
       
  • Studying the Evolution of Earthquake Network Measures for the Main Shock
           on June 24, 2015 in Egypt

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      Abstract: The monitoring of network measures, such as degree centrality, betweenness centrality, and clustering coefficient is performed, aiming to identify the periods that the earthquake network has distinct evolution before the main shock on June 24, 2015 in the area of Egypt. As nodes the 42 square cells that constitute a normal lattice imbricate on the investigation region are considered and the connections are drawn whenever earthquake succession is predestined between the node areas of seismic activity of the corresponding nodes. The data are possessed from a seismic catalog including crustal earthquakes (focal depth less than 50 km) of magnitude \(M \geqslant 2.5\) that occurred in the area of Egypt during the period of 1998‒2015. The earthquake network is created on sliding windows of 90 days and then the values of 9 network measures on each sliding window are computed before the main shock on June 24, 2015. The investigation of network measures revealed that more of the network measures values exhibit an abrupt jump just before the main shock occurrence.
      PubDate: 2022-04-29
       
  • Structural Analysis of the Coal-Bearing Kleidi Basin: Insights in
           Kinematics of the Broader Ptolemais Sedimentary Basin (Western Macedonia,
           Greece)

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      Abstract: This study processes borehole data from the coal-bearing Kleidi basin (Ptolemais sedimentary basin, Western Macedonia, Greece) to unravel the timeline of the neotectonic configuration of the basin and correlate it with the neotectonics of the broader region. Coal (lignite) deposits preserve faulted sequences, and for this reason they are ideal locations for studying deformation patterns. Lithostratigraphic data acquired by previous investigations revealed a continuous stratigraphic sequence which spans from the Upper Miocene to the Middle Quaternary. These Neogene deposits demonstrate their maximum thickness towards the SE of the basin. Boreholes also revealed that in the subsurface, the basin is actually divided into two separate grabens on either side of a ridge of the alpine basement. Stratigraphic interpolations using the inverse distance algorithm-generated thickness rasters which, through successive derivation, allowed the discovery of normal faults. Repetition of the algorithm using the new structural constraints returned patterns of deformation in the southern part of the Kleidi basin different from those revealed in the northern part. The configuration of the southern part of the Kleidi basin seems to reflect the Late Miocene–Pliocene extensional event. In contrast, configuration of the northern part of the basin is compatible with a later extensional phase in Pliocene‒Quaternary. Both events are manifested in the tectonostratigraphy of the Ptolemais sedimentary basin and the broader area.
      PubDate: 2022-04-29
       
  • Finite Strain and Structural Evolution for the Ajjaj Shear Zone,
           Northwestern Arabian Shield, Saudi Arabia

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      Abstract: The Ajjaj shear zone is a part of the regional-scale Quazaz–Ajjaj–Hamadat (QAH) shear zone that controls the structure of the northwestern Arabian Shield. The finite strain, and structural and tectonic evolution of the Ajjaj shear zone are estimated by fieldwork, analyzing its deformation history, and strain analysis. The Rf/φ and Fry techniques were used to measure the shape of quartz, plagioclase, potassium-feldspar, biotite, and hornblende crystals and to demonstrate the strain analysis for the felsic and mafic minerals separately. The results of finite-strain analysis illustrate that the long axes (X) for finite strain direction exhibits clustering along a NNW–SSE trend with varying plunge. The short axes (Z) are subhorizontal and associated with subvertical foliation. All data reveal oblate strain symmetry, which indicates a flattened shape. The strain magnitude (Et) suggests that no relationship exists between nappe contacts. There is no volume change for different mineral grains with the accumulation of finite strain in the Ajjaj area. Furthermore, the foliation is parallel to the thrusting and illustrated mainly the same attitudes of tectonic contacts with the overlying nappes. It is concluded that the Ajjaj shear zone supports NW-trending sinistral shear sense and resulted from simple-shear deformation for nappes.
      PubDate: 2022-04-29
       
  • Tectonics of the Basement of the Kara-Bogaz Arch (Turan Plate)

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      Abstract: The Kara-Bogaz geoblock is interpreted by many researchers as a structure underlain by the Precambrian sialic crust, incorporated in the young (epi-Hercynian) Turan Plate. The paper presents the results of a detailed study of the material composition of igneous and metamorphic rocks making up the basement of the Kara-Bogaz Arch and recovered by deep boreholes. To subdivide and correlate the sections, we employed data of geophysical borehole surveys, including all types of logging. Microscopic examination of rocks was also performed to determine their composition, genesis, and degree of postsedimentation alterations. Data on absolute ages of rocks and paleontological data were also employed. The results of the work of our predecessors have been studied and critically analyzed. It is established that there are no direct indications of the continental crust older than Paleozoic in the basement of the Near-Kara-Bogaz region. The metamorphic units of the Kara-Bogaz Arch are represented by primary sedimentary and volcanosedimentary deposits that were altered at the stage of regional greenschist metamorphism. These rocks are intruded by granitoid bodies corresponding to the final stages of Hercynian tectogenesis. In parts spatially close to intrusions, the degree of secondary alterations in metamorphic rocks increases due to the thermal effect. Amphibolites of the Kara-Bogaz Arch are metamorphosed igneous rocks, which are closely associated with primary terrigenous deposits and have undergone subsequent metamorphosis (greenschist facies regional metamorphism). Gneisses of the discussed region refer to the marginal facies of granitoid plutons that formed as a result of metasomatic reworking of the host strata (protomagmatic gneissic banding). We think that the Kara-Bogaz Arch is a Hercynian megaanticlinorium of the young platform, and this does not exclude the possibility of fragments of more ancient crust in the structure of this arch. The sedimentary–metamorphic and volcanosedimentary rocks making it up and intruded by multiple granitoid bodies are units of the active margin.
      PubDate: 2022-03-18
       
  • Atlantic-Type Passive Margin Structural Style of the Cretaceous Basin in
           Northern Tunisia: Paleoslope Reconstruction and Regional Tectonics

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      Abstract: The purpose of this paper is to characterize the configuration of northern Tunisia’s basin during the Cretaceous on the basis of abundant slump folds and frequent synsedimentary faults. The slump folds are studied to determine the slumps transport vergence on the synsedimentary submarine paleoslope. The local and regional stress field is used to characterize the syn-sedimentary deformation. During Valanginian–Aptian times, the basin is characterized by southward submarine slope. From Albian to Santonian times, the slump folds analysis provides NNW- to NW-ward sloping topography. The fault kinematic analysis reveals regional NW- to NNW-trending Cretaceous tectonic extension. Locally, NE- to N-trending extension is characterized. Perturbation of paleoslope orientation is locally observed probably related to salt tectonics hyperactive during Aptian–Albian. The constructed regional cross-section shows a tilted block geometry governed by major basement faults associated to other intra-basin growth faults. The basin shows ±5° seaward facing submarine paleoslope. In addition, some structures are probably dominated by raft tectonics. All these features are fairly consistent with the conclusion that the basin is very similar to the present-day Atlantic-type passive margins.
      PubDate: 2022-02-24
      DOI: 10.1134/S0016852122010034
       
  • Subsurface Structure Analysis of the Southern North Sea

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      Abstract: The subsurface structure analysis of the Southern North Sea through the interpretation of 2D seismic data set (SNSTI-NL-87 and SNST-NL-83) is carried out. The subsurface structural geometry of the research area is presented by several interpreted seismic lines, time structure maps, and isopach maps. The rocks presented beneath the Zechstein (Permian) are considered as the basement for the current study. The area was tectonically active in Permian, as the basement was faulted at several locations before the deposition of salt in Late Permian. The dominant fault trends of the area are NW‒SE and NE‒SW. Two main periods are believed to control development of structural elements, i.e. in Late Jurassic‒Early Cretaceous (extension) and Late Cretaceous‒Early Tertiary (inversion). Thick Triassic and Jurassic sediments are observed in the graben areas and due to possible erosion, these sediments are thin or not present on the structural highs. The compressional period and observed thickness variation of sediments are due to tectonic inversion and salt movement in Late Cretaceous.
      PubDate: 2021-11-18
      DOI: 10.1134/S0016852121060066
       
  • Age and Sources of Metasedimentary Rocks of the Galam Terrane in the
           Mongol–Okhotsk Fold Belt: Results of U–Pb Age and Lu–Hf Isotope Data
           from Detrital Zircons

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      Abstract: The Mongol–Okhotsk fold belt is one of the major structural elements of East Asia. In this article, we present U–Pb age and Hf isotope data for detrital zircons from metasedimentary rocks of the Galam Terrane. Our new data confirm that these rocks contain a significant amount of Archean and Paleoproterozoic zircons: most grains, regardless of age, have negative εHf(t) values from –30.0 to –10.0 and model age tHf(C) > 2.2 Ga. The main sources of detrital material for the metasedimentary rocks of the Galam Terrane were igneous and metamorphic complexes of the southeastern margin of the Siberian Craton. Some of the Devonian and Carboniferous zircons have slightly negative and positive εHf(t) values of ‒7.4 to +6.9 and younger tHf(C) ages of 1.46–0.90 Ga. These zircons were derived from eroded island arcs in the Mongol–Okhotsk Paleocean. Our results suggest that the Galam Terrane is a Paleozoic accretionary complex of the Siberian Craton.
      PubDate: 2021-11-01
      DOI: 10.1134/S001685212106008X
       
  • Stress State of the Earth’s Crust and Seismotectonics of Western
           Sichuan, China

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      Abstract: The results of using a technology for zoning hazardous faults developed at the Institute of Physics of the Earth based on natural stress data are presented. The source of these data is catalogs of earthquake focal mechanisms, while inversion of stresses from them is obtained by cataclastic analysis of discontinuous displacements. For the studied region, which includes China’s largest provinces, Sichuan and Yunnan, stresses are reconstructed from a regional catalog of focal mechanisms of earthquakes with Mw = 2.0–6.0 for 1999‒2012. The ability to predict the state of faults is based on data on the normalized values of the isotropic and deviator components of the stress tensor. Two variants of fault zoning are presented, which resulted from application of the Drucker–Prager and the Mohr–Coulomb criteria characterizing the elastoplastic and brittle behavior of the crust, respectively. It is shown that the second approach yields better and more detailed information on the state along the active faults of the western Sichuan region. Analysis of the state of the Longmen Shan fold-and-thrust belt prior to the Wenchuan earthquake that occurred on May 12, 2008, showed that the distribution of Coulomb stresses along the fault with at least 70% of the length, and a high level of Coulomb stresses (>60% of the critical stresses) should be considered hazardous. Based on the tectonophysical zoning findings, more than 20 sites of active faults with lengths of 60–140 km have been identified in the studied region, which we consider as potential sources of strong earthquakes with magnitudes ≥7.0.
      PubDate: 2021-11-01
      DOI: 10.1134/S0016852121060078
       
  • Structure and Geodynamic Evolution of the Maksyutov Metamorphic Complex
           (Southern Urals): Structural Analysis and Results of U–Pb Dating of
           Detrital Zircons

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      Abstract: Detailed structural analysis of the formations of the Maksyutov eclogite–glaucophane–schist complex in the Southern Urals has been carried out. U–Pb (LA-ICP-MS) isotopic dates of detrital zircons from quartzites of the Yumaguzino and Karamala groups (tectonostratigraphic units) making up the complex were obtained. The data show that both groups are similar in age but differ in the facies formations that comprise the proximal (Yumaguzino Group) and distal (Karamala Group) regions of the Paleozoic margin of the Baltica paleocontinent. The alternation of these groups in the Maksyutov Complex is explained by their tectonic juxtaposition during the formation of the scaly-thrust structure of this complex. Formations of the Maksyutov Complex subsided in the subduction zone beneath the Magnitogorsk island arc and were subjected to fold deformations during the subsequent exhumation. Four deformation stages have been established during the structural evolution of the complex. The first stage is associated with the development of the southwest-vergent folds and sheath folds F1 and corresponds to the eduction of the formations of the Maksyutov metamorphic complex from the subduction zone of the Magnitogorsk island arc in the southwestern direction (in modern coordinates) in the middle of the Famennian–Late Devonian. The second stage manifests itself in the development of the southeast-vergent folds F2, which are most common in the Maksyutov Complex. This stage is associated with an oblique sinistral collision of the Magnitogorsk island arc with the Baltica margin in the Late Devonian. At the third deformation stage, the west-vergent folds F3 were formed, caused by movements during the Late Paleozoic continental collision in the Main Ural Fault Zone. Postcollisional shear movements at the fourth deformation stage, marked by the development of folds F4 with steeply dipping hinges, completed the main stage of the structural evolution of the region.
      PubDate: 2021-11-01
      DOI: 10.1134/S0016852121060030
       
  • The Deformation Mechanisms of Tien Shan Basement Rocks in Alpine
           Tectogenesis

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      Abstract: The article describes the main mechanisms of deformation of rock masses of the Paleozoic basement of the Tien Shan complementary to plicative bending of its surface in the process of alpine tectogenesis. Mechanisms of volumetric deformation of various types are characterized with the example of specific geological structures: mélange, plastic deformation, cataclastic flow, dynamic recrystallization, etc. It has been determined that on the territory of the Tien Shan, the deformation of Pre-Mesozoic and younger surfaces of the leveling and overlying plate-orogenic sedimentary cover is associated primarily with 3D mobility (Reid flow) of mountain masses of the Paleozoic basement. Assumptions are made regarding the physics of the process, based on advances in the mechanics of block-granular media and fracture mechanics.
      PubDate: 2021-11-01
      DOI: 10.1134/S0016852121060042
       
  • Relationship between Superficial and Deep Tectonics in the African Region
           Based on Geological–Geophysical Data

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      Abstract: The spatial relationships of the lower mantle D" layer elements with Phanerozoic Large Igneous Provinces (LIPs), as well as with the young hotspots and kimberlites in the African region, are discussed. Similar relationships are also shown for the Cape Karoo and Parana extended basins, which had developed as inherited structures along the marginal parts of the region since the Early Paleozoic. The specific locations are marked for all these superficial structures and plumes producing them. These locations indicate the connection between these structures origin and the domains where the Earth’s core, Large Low-Velocity Provinces (LLSVPs), and slab graveyards contact with each other. The relationships between plume- and plate-tectonic processes in the Earth’s evolution are considered. Constant interaction between the Pacific and Indo-Atlantic segments of the Earth is revealed in the course of these processes. The Pacific segment was characterized by ocean formation during the Phanerozoic time and subsequent subduction under the continental landmasses of Indo-Atlantic segment. The constant character of spreading in the Pacific Ocean was obviously determined by the presence of its direct connection with the Pacific LLSVP. Within the D" layer in the areas of contact between the Pacific subducting slabs and African LLSVP, plume generation occurred periodically, subsequently leading to supercontinental breakup. This determined the specific character of the Indo-Atlantic segment development: the alternation of convergence and continental breakup during the Phanerozoic. In general, despite the significant similarities between the antipodal African and Pacific LLSVPs, their role in formation of the superficial largest structural elements appears to be inequable. Perhaps this is what had become one of the main reasons that caused fundamental differences between these two segments and led to the formation of tectonic asymmetry of the Earth.
      PubDate: 2021-11-01
      DOI: 10.1134/S0016852121060054
       
  • East Pekulnei Oceanic Crust Terrane (Northeasternmost Asia, Russia): A
           Fragment of the Late Jurassic–Early Cretaceous Sliding Plate Boundary
           between the Paleo-Pacific and Chukotka Microcontinent

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      Abstract: — The West Pekulnei marginal continental arc terrane adjoins the East Pekulnei oceanic crust terrane, the siliceous–volcanic strata of which (Pekulneiveem Formation, PV) are subdivided into two complexes. The first PV-1 complex comprises a dike series; pillow basalts with elevated Nb and TiO2 contents and FeO*/MgO ratios; and siliceous–argillaceous deposits dated as Bajocian–Kimmeridgian. The second PV-2 complex consists of low-Ti, N-MORB-type pillow basalts with a low Nb content, combined with magnesian basalts, picrite–basalts, and mafic tuffaceous rocks. The siliceous–argillaceous deposits of the PV-2 complex are dated as Late Jurassic–Early Cretaceous based on radiolarian assemblages and contain Valanginian macrofauna; the admixture of terrigenous material and the detritus of intermediate and felsic volcanic rocks suggest the PV-2 complex generation in the vicinity of a source of allothigenic material. New data on the geology and geochemical composition of the pillow basalt sequence suggest the formation of the PV-1 complex in a Paleo-Pacific spreading center. The composition and datings of the rocks of the PV-2 complex indicate its formation during the Tithonian–Valanginian in the junction zone of the oceanic plate and the Pekulnei–Zolotogorsk margin of the Chukotka continent. The formation of the PV-2 complex immediately after the convergence of the Paleo-Pacific plate (PV-1) with the continental margin is explained by the young PV-2 oceanic crust generation in a spreading center, which emerged in a transform fault zone. The Pekulnei arc formed during the Tithonian–Valanginian at the Pacific margin of Eastern Chukotka; the magmatic complexes of this arc, besides the IAT and CA series, include low-Ti MORB-type basalts, similar in composition to a certain part of the PV-2 basalts. Presumably, a single tectonic structure existed in the Tithonian–Valanginian that controlled the basaltic magmatism of both terranes; this structure could be a transtensional segment of the transform fault zone. The synchronous development of the Pekulnei arc and PV-2 complexes and the geochemical correlation between the basalts suggest that the Tithonian–Valanginian subduction within the Pekulnei segment was induced by the opening of the PV-2 basin in the transform fault zone and the subduction of the young oceanic crust beneath the margin of Eastern Chukotka.
      PubDate: 2021-09-01
      DOI: 10.1134/S0016852121050058
       
  • Tectono-Geodynamic Settings in the Conjugation Zone of the Lomonosov
           Ridge, Eurasian Basin, and Eurasian Continental Margin

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      Abstract: Interpretational analysis of new seismic data allowed us to reconstruct the geodynamic settings that led to the formation of an ensemble of tectonic structural elements in the conjugation zone of the Eurasian Basin, Lomonosov Ridge, and Eurasian continental margin (Laptev and East Siberian seas). The presence of the Khatanga–Lomonosov fracture zone (KhLFZ), adapted to the conjugation zone of the continental margin, structures of the Eurasian spreading basin, and the Lomonosov Ridge, is substantiated. The representation of the KhLFZ in anomalous geophysical fields and wave pattern in seismic sections is analyzed to reveal the nature of kinematic relationship between the KhLFZ and adjacent tectonic elements. Shear displacements along the KhLFZ ceased in the Early Cenozoic (~46 Ma ago) simultaneously with the transition to the ultraslow spreading phase of the Gakkel Ridge. Our analysis of the geological and geophysical data shows that in the southern segment of the Eurasian Basin, where regular narrow magnetic anomalies are absent, the base of the sedimentary cover is predominantly represented by highly stretched blocks of the continental basement. The formation of the Gakkel Ridge’s axial spreading zone in this segment took place in three stages: (i) rifting in the Aptian–Albian, (ii) telescoped development in the Late Cretaceous–Paleocene–Eocene, and (iii) inherited formation of the rift valley during the late interval of the neotectonic stage. The evolution of the Severny Basin, located in the conjugation zone of the Lomonosov Ridge and continental margin, has a formation scenario similar to pull-apart basins; its formation was interrelated with the simultaneously opening of the adjacent southeasternmost segment of the Amundsen Basin (part of the Eurasian Basin).
      PubDate: 2021-09-01
      DOI: 10.1134/S0016852121050071
       
  • Formation and Development Forecast of the Western Arctic as a Segment of
           the Atlantic–Arctic Rift System

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      Abstract: The article overviews the existing data and ideas about the structure of the Atlantic–Arctic rift system, the youngest segment of which is the Western Arctic. The main properties of this system are the direction of its progradation towards the North Pole, the submeridional orientation of the rifts, their separation by latitudinal faults, and predominantly left-lateral shear displacement of individual segments. It is assumed that such a structure reflects the regularities in the distribution of lithospheric masses under the influence of the rotational factor. Their striving towards an equilibrium position relative to the axis of rotation is realized due to movements towards and along the equator. These processes ensure growth of the rift system; however, no driving forces for its further development after reaching the pole have been identified. An analog model of the sequential segregation of segments in a growing rift system is proposed.
      PubDate: 2021-09-01
      DOI: 10.1134/S0016852121050034
       
  • Tectonic Position of the South Anyui Suture

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      Abstract: — The South Anyui Fold System was formed at the end of the Early Cretaceous at the site of a closed oceanic basin as a result of the collision of the Chukotka microcontinent with the structures of the active margin of the Siberian continent. There are two distinct stages in the tectonic history of the oceanic basin. At the first stage (Late Paleozoic–Early Mesozoic), there was the Proto-Arctic Ocean, which united the South Anyui and Angayucham basins. The second stage (Volgian–Hauterivian–Barremian) began with cessation of spreading, the shortening of the oceanic basin, and accumulation of turbidites. In the west, the South Anyui Suture ends in the Khroma Loop and, like the Kolyma Loop, the suture is a package of allochthons composed of fragments of the Proto-Arctic Ocean. In the central part, the suture is the result of the collision of the Chukotka microcontinent with the active margin of the Kolyma–Omolon microcontinent. The eastern end of the collisional suture is formed by ophiolites in the Matachingai River basin. The Late Triassic–Early Jurassic ensimatic island arcs of the Velmay Terrane accreted to the Chukotka microcontinent in eastern Chukotka. In this area, the Proto-Arctic Ocean connected with the Meso-Pacific Ocean, from where the island-arc terranes were transported. The South Anyui Suture is the border of the Verkhoyansk–Kolyma and Chukotka fold regions and, accordingly, the border of the Pacific and Arctic structures. There are significant differences in the tectonic evolution of these structures, which are determined by the different history and age of the Proto-Arctic and Oymyakon paleoceans, fragments of which were preserved in the Khroma and Kolyma structural loops, as well as the patterns of sedimentation on the Verkhoyansk and Chukotka passive margins, which belonged to the Siberia and Laurentia paleocontinents.
      PubDate: 2021-09-01
      DOI: 10.1134/S0016852121050083
       
  • Stages of Granitoid Magmatism and Formation of the Continental Crust of
           Eastern Arctic

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      Abstract: Three main stages of granitoid magmatism and continental crust formation of Eastern Arctic are distinguished: Neoproterozoic (750–550 Ma), Devonian–Early Carboniferous (390–350 Ma), and Early Cretaceous (117–105 Ma). The correlation of Neoproterozoic granitoid magmatism of the New Siberian Islands, Wrangel Island, the Chukchi Peninsula, Chukchi Borderland, and Northern Alaska indicates the unity of the basement of Arctic Alaska–Chukotka microplate (AАСM) and its Meso–Neoproterozoic age. The geodynamic setting of the formation of Neoproterozoic granitoids of most of the microplate is supposed as continental margin, less often active rifting (Seward Peninsula, Alaska).The Devonian-Early Carboniferous stage is related to different phases of Ellesmerian orogeny in the Arctic region. The formation of granitoids of this age occurred in an island arc, continental margin, or back-arc settings. The Early Cretaceous stage of continental crust formation is related to the collision between the Siberian continent and AАСM in Hauterivian–Barremian. In Aptian–Albian, the collisional compression regime was followed by postcollisional extension, accompanied by the formation of metamorphic core complexes, granitoid intrusion, and superimposed orogenic basins. Data on the mineralogical, chemical, and geochemical compositions of granitoids of all three stages indicate that the Neoproterozoic granitoids are similar to S- and I-type granites; Devonian–Early Carboniferous, to predominantly I-type granites; Early Cretaceous, to I- and A-type granites. Sr–Nd isotopic data, as well as Lu–Hf zircon data, indicate the participation of both crustal and mantle components in the formation of the source of granitoid melts at all stages.
      PubDate: 2021-09-01
      DOI: 10.1134/S0016852121050046
       
  • Model of Formation of the Sedimentary System of the Eurasian Basin, the
           Arctic Ocean, as a Basis for Reconstructing Its Tectonic Evolution

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      Abstract: For the first time tectonic reconstructions was carried out along the entire seismic dataset, including both Russian and international seismic lines. Based on the analysis of the sedimentary cover of the Eurasian Basin (Arctic Ocean), four stages of evolution of the sedimentation system were identified. During the first, Cretaceous–Paleocene stage, vast axisymmetric epicontinental Amundsen and Nansen paleo basins were formed on the shoulders of the continental rift. Similar rifting environments of the second half of the Cretaceous were recorded along the entire periphery of the Arctic Ocean from Greenland and Svalbard to the Chukchi Borderland. The second (Eocene) stage was characterized by gradual expansion of the sedimentary basin up to its present-day size, caused by accretion of oceanic crust in the Gakkel Ridge and seafloor spreading. The Eurican orogeny, which formed dextral De-Geer transform zone, was suggested as a main tectonic driver of the spreading stage. The third (Oligocene‒Miocene) stage corresponds to the accumulation of undisturbed veneer of hemipelagic sediments of 300‒600 meter thick, which covered the entire Eurasian Basin. Accumulation of undisturbed sediment sequence throughout the Eurasian Basin indicates the cessation of seafloor spreading in the Gakkel Ridge and the establishment of a tectonic dormancy regime untill the neotectonic stage onset. The similar tectonic regime is recorded along the entire periphery of the Arctic Basin. The resumption of the seafloor spreading in the Gakkel Ridge occurred during the fourth (Pliocene‒Quaternary) stage. We suggest that the re-spreading process in the Eurasian basin has tectonically been triggered by the activation of the similar process in the Norwegian‒Greenland Basin. Propagation of the tectonic stresses along the Gakkel Ridge toward the Siberian segment of the Eurasian Basin explains both the distinct morphological segmentation of the Gakkel Ridge into the Siberian and Atlantic segments, and the anomalously high tectonic, volcanic and hydrothermal activity of the Gakkel Ridge.
      PubDate: 2021-09-01
      DOI: 10.1134/S001685212105006X
       
  • Remote Sensing Study of Neotectonics in Central Suleiman Fold and Thrust
           Belt (CSFTB), Pakistan

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      Abstract: In our research paper, new observations and results of the Central Suleiman fold-and-thrust belt (CSFTB) that highlights the topographic evolution and active deformation in this region are presented. The CSFTB is the westernmost and geodynamic active region of the Himalayan fold-and-thrust belt (HFTB) in the southwest of Pakistan. The duplex deformation style continues within the CSFTB. Earthquake data show that the seismic clusters and deformation in the study area are concentrated as a thick stack of sediments covering the under-thrusting lithospheric crust. In this study, new observations and results are presented to identify tectonic features and topographic evolution and active deformation in CSFTB in by applying cost-effective remote sensing and GIS techniques. Hack gradient index (HGI), drainage density and river profile model were performed to constrain neotectonic activity in the investigation site. The results obtained were interesting and consistent with the regional automatic derived lineaments and published major faults. The results indicate that the eastern, southeastern and the western sections of CSFTB are comparatively more uplifted than the central part of the investigation region. The stream length gradient map also shows relatively more gradient values in the south-east, north-west, west and south-west with relatively less values in the central part of the study area. The CSFTB is characterized by strong geometric correlation between the north-east‒south-west regional tectonic structures, automated lineaments and orientations of the stream network.
      PubDate: 2021-07-01
      DOI: 10.1134/S0016852121040129
       
 
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