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)            First | 1 2 3     

Showing 201 - 371 of 371 Journals sorted alphabetically
Hydrological Processes     Hybrid Journal   (Followers: 44)
Hydrology and Earth System Sciences     Open Access   (Followers: 38)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 151)
IEEE Geoscience and Remote Sensing Magazine     Hybrid Journal   (Followers: 6)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Indian Geotechnical Journal     Hybrid Journal   (Followers: 4)
Indonesian Journal on Geoscience     Open Access   (Followers: 1)
Inland Waters     Hybrid Journal  
Innovative Infrastructure Solutions     Hybrid Journal  
Interdisciplinary Environmental Review     Hybrid Journal   (Followers: 3)
International Geology Review     Hybrid Journal   (Followers: 17)
International Journal of Advanced Geosciences     Open Access   (Followers: 2)
International Journal of Advanced Remote Sensing and GIS     Open Access   (Followers: 50)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
International Journal of Disaster Risk Reduction     Hybrid Journal   (Followers: 18)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Earthquake and Impact Engineering     Hybrid Journal   (Followers: 4)
International Journal of Energetic Materials     Full-text available via subscription  
International Journal of Environment and Geoinformatics     Open Access   (Followers: 4)
International Journal of Geo-Engineering     Open Access   (Followers: 2)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
International Journal of Geosciences     Open Access   (Followers: 10)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 3)
International Journal of Geotechnical Earthquake Engineering     Full-text available via subscription   (Followers: 9)
International Journal of Image and Data Fusion     Hybrid Journal   (Followers: 3)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Soil, Sediment and Water     Open Access   (Followers: 4)
International Journal of Speleology     Open Access   (Followers: 3)
Iraqi National Journal of Earth Sciences     Open Access  
iScience     Open Access   (Followers: 1)
Island Arc     Hybrid Journal   (Followers: 5)
ISPRS International Journal of Geo-Information     Open Access   (Followers: 5)
Italian Journal of Geosciences     Open Access  
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins     Full-text available via subscription   (Followers: 2)
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Earth Science & Climatic Change     Open Access   (Followers: 14)
Journal of Advances in Modeling Earth Systems     Open Access   (Followers: 5)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access  
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Applied Volcanology     Open Access   (Followers: 7)
Journal of Arid Land     Hybrid Journal  
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences : X     Open Access  
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of Big History     Open Access   (Followers: 3)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Journal of Coastal Research     Hybrid Journal   (Followers: 31)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Contemporary Water Resource & Education     Hybrid Journal   (Followers: 2)
Journal of Earth Science     Hybrid Journal   (Followers: 12)
Journal of Earth System Science     Open Access   (Followers: 52)
Journal of Earth, Environment and Health Sciences     Open Access   (Followers: 2)
Journal of Earthquake and Tsunami     Hybrid Journal   (Followers: 2)
Journal of Earthquake Engineering     Hybrid Journal   (Followers: 14)
Journal of Environment and Earth Science     Open Access   (Followers: 11)
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 2)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Journal of Geodesy and Geoinformation     Open Access   (Followers: 2)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Journal of Geography, Environment and Earth Science International     Open Access  
Journal of Geology     Full-text available via subscription   (Followers: 30)
Journal of Geomorphology     Open Access   (Followers: 3)
Journal of Geophysical Research : Atmospheres     Partially Free   (Followers: 134)
Journal of Geophysical Research : Biogeosciences     Full-text available via subscription   (Followers: 34)
Journal of Geophysical Research : Earth Surface     Partially Free   (Followers: 59)
Journal of Geophysical Research : Oceans     Partially Free   (Followers: 60)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 116)
Journal of Geophysical Research : Solid Earth     Full-text available via subscription   (Followers: 57)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 136)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Journal of Geoscience Education     Hybrid Journal   (Followers: 1)
Journal of Geoscience, Engineering, Environment, and Technology     Open Access   (Followers: 1)
Journal of Geosciences     Open Access   (Followers: 5)
Journal of Geosciences and Geomatics     Open Access   (Followers: 1)
Journal of Geospatial Applications in Natural Resources     Open Access  
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical Engineering     Full-text available via subscription   (Followers: 4)
Journal of Great Lakes Research     Hybrid Journal   (Followers: 5)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Journal of International Maritime Safety, Environmental Affairs, and Shipping     Open Access   (Followers: 1)
Journal of Life and Earth Science     Open Access  
Journal of Marine Medical Society     Open Access   (Followers: 1)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Journal of Mountain Science     Hybrid Journal  
Journal of Natural Gas Geoscience     Open Access  
Journal of Ocean and Climate     Open Access   (Followers: 9)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
Journal of Petroleum Exploration and Production Technology     Open Access   (Followers: 2)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Population and Sustainability     Open Access  
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Journal of Rock Mechanics and Geotechnical Engineering     Open Access   (Followers: 3)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Journal of Sedimentary Environments     Open Access  
Journal of Seismology     Hybrid Journal   (Followers: 9)
Journal of Spatial Information Science     Open Access   (Followers: 4)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Journal of the Geological Society     Hybrid Journal   (Followers: 17)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Journal of Water and Climate Change     Open Access   (Followers: 52)
Journal on Geoinformatics, Nepal     Open Access   (Followers: 2)
Jurnal Ilmiah Perikanan dan Kelautan / Scientific Journal of Fisheries and Marine     Open Access  
Kartografija i geoinformacije (Cartography and Geoinformation)     Open Access  
Lake and Reservoir Management     Hybrid Journal   (Followers: 7)
Landslides     Hybrid Journal   (Followers: 26)
Latin American Journal of Sedimentology and Basin Analysis     Open Access   (Followers: 1)
Lethaia     Hybrid Journal   (Followers: 5)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Limnology     Hybrid Journal   (Followers: 9)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Lithos     Hybrid Journal   (Followers: 9)
Malaysian Journal of Geosciences     Open Access  
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Marine Biology Research: New for 2005     Hybrid Journal   (Followers: 2)
Marine Economics and Management     Open Access   (Followers: 3)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Marine Geology     Hybrid Journal   (Followers: 31)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Marine Georesources & Geotechnology     Hybrid Journal  
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Marine Policy     Hybrid Journal   (Followers: 61)
Mathematical Geosciences     Hybrid Journal   (Followers: 4)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mediterranean Geoscience Reviews     Hybrid Journal  
Meteoritics & Planetary Science     Hybrid Journal   (Followers: 18)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Mineria y Geologia     Open Access  
Mining, Metallurgy & Exploration     Hybrid Journal  
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
Mongolian Geoscientist     Open Access  
Moscow University Geology Bulletin     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Natural Hazards     Hybrid Journal   (Followers: 53)
Natural Hazards and Earth System Sciences (NHESS)     Open Access   (Followers: 10)
Natural Hazards and Earth System Sciences Discssions     Open Access  
Natural Hazards Research     Open Access  
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 8)
Nature Geoscience     Full-text available via subscription   (Followers: 162)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Nonlinear Processes in Geophysics (NPG)     Open Access  
Nonlinear Processes in Geophysics Discussions     Open Access  
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Ocean Modelling     Hybrid Journal   (Followers: 12)
Ocean Science (OS)     Open Access   (Followers: 7)
Ocean Science Journal     Hybrid Journal   (Followers: 6)
Open Geospatial Data, Software and Standards     Open Access   (Followers: 3)
Open Journal of Earthquake Research     Open Access   (Followers: 3)
Open Journal of Soil Science     Open Access   (Followers: 9)
Ore and Energy Resource Geology     Open Access  
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Osterreichische Wasser- und Abfallwirtschaft     Hybrid Journal  
Paläontologische Zeitschrift     Hybrid Journal   (Followers: 4)
Papers in Palaeontology     Hybrid Journal  
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 1)
Petroleum Geoscience     Hybrid Journal   (Followers: 5)
Petroleum Science     Open Access  
Petrology     Full-text available via subscription   (Followers: 6)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 4)
Photogrammetrie - Fernerkundung - Geoinformation     Full-text available via subscription  
Physical Geography     Hybrid Journal   (Followers: 8)
Physical Science International Journal     Open Access  
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Physics of the Solid State     Hybrid Journal   (Followers: 7)

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Neues Jahrbuch für Mineralogie - Abhandlungen
Journal Prestige (SJR): 0.307
Citation Impact (citeScore): 1
Number of Followers: 1  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0077-7757 - ISSN (Online) 2363-7161
Published by Schweizerbart Science Publishers Homepage  [23 journals]
  • Geochemistry and Zircon-Allanite U-Pb Geochronology of Aplites-Pegmatites
           in the Qorveh Region, Sanandaj-Sirjan Zone, Iran

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      Abstract: Geochemistry and Zircon-Allanite U-Pb Geochronology of Aplites-Pegmatites in the Qorveh Region, Sanandaj-Sirjan Zone, IranSepahi, Ali A.; Salami, Sedigheh; Maanijou, Mohammad; Lentz, David R.; McFarlane, Chris R. M.; Vahidpour, Hamed
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. - AbstractThe aplites-pegmatites in the Qorveh region, NW Sanandaj-Sirjan zone, Zagros orogen, Iran, appear as dikes intruding various lithologies, such as granite, gabbro, diorite, and marble. These dikes have mostly granitic compositions, and their alumina saturation index (ASI) varies from metaluminous to peraluminous. Comparatively high amounts of incompatible trace elements, such as Nb (up to 109 ppm), Ba and Rb (up to 586 ppm), indicate an evolved composition of these dikes. The zircon U-Pb ages for an aplite sample from the Kangareh area are concordant, but scatter from c. 162 to 132 Ma, whereas allanite yields a 151.0 ± 4.3 Ma age (Mean Square of Weighted Deviates, MSWD = 1.4). Allanite of an aplitic dike from the Mayham area gave a U-Pb age of 150.3 ± 4.3 Ma (MSWD = 1.2). The ages obtained for aplite dikes indicate approximately the same ages as previously reported ages (140–160 Ma) for plutonic rocks of the region; therefore, Late Jurassic magmatic (plutonic) activities possibly in a continental arc setting could be an important feature in the region.
      PubDate: Tue, 17 May 2022 00:00:00 +000
       
  • Mineral chemistry from the Late Cretaceous peralkaline rhyolite at Hadjer
           el Khamis, Chad: constraints on magmatic conditions

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      Abstract: Mineral chemistry from the Late Cretaceous peralkaline rhyolite at Hadjer el Khamis, Chad: constraints on magmatic conditionsShellnutt, J. Gregory; Iizuka, Yoshiyuki; Lee, Tung-Yi; Chen, Wei-Yu
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. - AbstractThe Late Cretaceous (74.4 ± 1.3 Ma) peralkaline rhyolite from Hadjer el Khamis erupted during a period of rifting within the Bornu and Termit basins of the Lake Chad region. The rhyolites are representative of a residual silicic magma that was derived by fractional crystallization of mantle derived basaltic parental magma. The primary phenocrysts of the rocks are quartz, alkali feldspar, arfvedsonite, aegirine, hedenbergite, and ilmenite. From the whole rock and mineral compositions, we conclude that the pre-eruptive temperatures were between 800 °C and 900 °C, but probably closer to 850 °C to 900 °C. The Fe-rich mafic mineral compositions and absence of magnetite indicate that the relative oxidation state of the melt was below the fayalite-magnetite-quartz buffer. The estimated relative oxidation state is calculated to range from ∆FMQ –1.1 to ∆FMQ –2.8. The water content of the magma was likely close to or at saturation (i.e. H2O ≈ 3.2 wt%) whereas the fluorine content was likely less than saturation (i.e. Fmeltwt% < 0.6 wt%) due to the absence of magmatic fluorite. The pre-eruptive magma was likely volatile-rich, but underwent a period of significant degassing prior to or during eruption that led to a drier lava with higher viscosity, lower effusivity that allowed for slow cooling, the development of columnar joints, and the crystallization of hypersolvus feldspar.
      PubDate: Tue, 17 May 2022 00:00:00 +000
       
  • Geochemical and petrographic characteristics of eclogite-amphibolite
           

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      Abstract: Geochemical and petrographic characteristics of eclogite-amphibolite bodies in the northern Fleur-de-Lys Supergroup of NE Newfoundland, CanadaMassonne, Joachim; Opitz, Joachim; van Staal, Cees
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. - AbstractThe results of a detailed study of thirty eclogite and amphibolite bodies embedded within gneiss and schist of the northern Fleur-de-Lys Supergroup (NFLS) in northeastern Newfoundland, eastern Canada, are presented. The NFLS represents a part of the Iapetus margin of Laurentia that was deeply buried as a result of an arc-continent collision during the Taconic orogeny. Our petrographic and geochemical study was principally aimed at investigating (1) the character of the protoliths of the metabasic bodies and (2) whether the amphibolites represent retrogressed eclogites. The obtained geochemical data indicate that nearly all samples have a mid-ocean ridge basalt (MORB)-like signature. Rare-earth element patterns yielded occasionally a slightly negative Eu anomaly. Ce/Yb ratios, normalized to chondrite, are between 0.6 and 6.4. Thus, the protoliths of nearly all of our samples were N- to E-MORBs. The petrographic and geochemical results suggest that NFLS amphibolites were formed by retrogression of pre-existing eclogite. In addition, we compared the geochemical data determined by (1) inductively coupled plasma (ICP) optical emission spectroscopy and ICP mass spectrometry (MS) after rock powder + Li-borate had been melted and dissolved in nitric acid and (2) X-ray fluorescence spectroscopy using glass discs with those obtained from a rarely applied method combining laser ablation of these discs and ICP-MS. The comparison demonstrates that this method should be optimized by an advanced mass-dependent sensitivity drift correction.
      PubDate: Tue, 08 Mar 2022 00:00:00 +000
       
  • Petrogenesis and tectonic environments for formation of peridotites and
           associated podiform chromite ore, southern part of Manipur Ophiolite Belt,
           Indo-Myanmar Orogenic Belt, NE India

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      Abstract: Petrogenesis and tectonic environments for formation of peridotites and associated podiform chromite ore, southern part of Manipur Ophiolite Belt, Indo-Myanmar Orogenic Belt, NE IndiaPremi, Kshetrimayum; Sen, Amit Kumar; Singh, A. Krishnakanta; Lakhan, Nongmaithem
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. 209 - 232AbstractThis article describes a new comprehensive study of mantle peridotites and associated podiform chromite ore from the southernmost part of Manipur Ophiolite Belt (MOB), northeast India. The ophiolitic suite of rocks exposed in the study area are comprised of well-preserved peridotite, chromite ore bodies with minor mafic (gabbro, basalt, mafic dyke) and felsic (plagiogranite) rocks, and oceanic pelagic sediments. The mantle peridotite consists chiefly of lherzolite with a lesser amount of harzburgite, whereas the chromite ore bodies (pods, lenses, veins) of variable sizes are hosted within the peridotites. The composition of chrome spinel in the peridotite is characterized by high Al2O3 (> 45 wt.%), Mg# (< 80) and low in Cr# (< 24). The chrome-spinel and olivine (Fo < 91) compositions and the characteristics of REE-distribution pattern resemble with the abyssal peridotites that preferentially generated in the mid-oceanic ridge tectonic setting by low degree of partial melting (< 12 %) of the mantle. Conversely, the chromite mineral in the ore is low in Al2O3 (11.15–21.13 wt.%), high in Cr# (61.94–77.86) with Mg# content in massive (60.23–71.47) and altered (13.15–54.02) chromite ores. These characteristics indicate their derivation from a boninitic melt by a higher degree of partial melting (> 20 %) at the supra-subduction zone tectonic environment. The results in the present study support that the magmatism in the mid-oceanic environment followed by subduction-related tectonic activity was responsible for the evolution of MOB. Later, the entire ophiolite sequence was obducted and emplaced along the eastern plate margin of the Indian subcontinent and the Indo-Myanmar Orogenic Belt during collisional orogeny.
      PubDate: Tue, 25 Jan 2022 00:00:00 +000
       
  • Shoshonitic magmatism in the Deh-Zahir area, southeast Iran: Evidence for
           post collisional magmatism and mantle metasomatism in the southeastern
           Urumieh-Dokhtar magmatic arc

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      Abstract: Shoshonitic magmatism in the Deh-Zahir area, southeast Iran: Evidence for post collisional magmatism and mantle metasomatism in the southeastern Urumieh-Dokhtar magmatic arcSalehi Nejad, Hamideh; Ahmadipour, Hamid; Moinzadeh, Hesamodin; Nazarinia, Asma; Moradian, Abbas; Lentz, David R.; Papadopoulou, Lambrini; Santos, José Francisco
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. 233 - 251AbstractIn the northern part of the Dehaj-Sarduieh volcano-plutonic belt (Deh-Zahir area, Kerman province, Iran), a series of subvolcanic rocks occur as dykes. These dykes show variable porphyritic textures and contain large plagioclase, clinopyroxene, K-feldspar and occasionally altered olivine phenocrysts set in an intergranular and trachytic textured groundmass. The groundmass consists of olivine, clinopyroxene, plagioclase, K-feldspar, analcime and opaque crystals. Electron microprobe analyses reveal that the plagioclases are mainly bytownite, K-feldspars are sanidine and pyroxenes are diopside and salite. Based on geochemical data, these rocks are classified as trachy-basalts with shoshonitic affinity, with primitive mantle-normalized spider diagrams showing clear depletions in Nb, Ti, and heavy rare earth elements (HREE) + Y and a strong enrichment in large-ion lithophile elements (LILE). Chondrite-normalized REE diagrams for these rocks show light REE enrichment, but heavy REE + Y are less, without any remarkable Eu anomaly. Primitive 87Sr/86Sr ratios and positive εNd values for the studied dykes change from 0.70438 to 0.70550 and 2.09 to 5.76, respectively, of which these were derived from parental magma extracted from partial melting of metasomatized mantle, namely spinel peridotite. However minor contamination with upper crust was also involved in the composition of the studied dykes. Tectonomagmatic discrimination diagrams and zircon U-Pb age data show that the Deh-Zahir dykes formed after collision of the Arabian and Eurasian plates in the Miocene.
      PubDate: Tue, 25 Jan 2022 00:00:00 +000
       
  • Possibilities for misidentification of natural diamond and coesite in
           metamorphic rocks

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      Abstract: Possibilities for misidentification of natural diamond and coesite in metamorphic rocksKeller, Duncan S.; Ague, Jay J.
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. 253 - 261AbstractCoesite and diamond are the traditional indicator minerals used to identify ultrahigh-pressure (UHP) metamorphic rocks, which are rare records of deep subduction zone processes. However, concerns of UHP indicator misidentification and sample contamination drive dialogue on UHP discoveries. We document scenarios in which contamination artifacts or other mineral phases analytically or visually mimic genuine metamorphic diamond and coesite; these examples complement and extend discussion of sample contamination in suspected UHP rocks. Diamonds embedded or trapped during routine sample preparation can appear nearly identical to metamorphic diamond textures, including the radial polishing scratches that facilitate diamond recognition at thin section surfaces, and in some cases may not be dislodged by ultrasonic cleaning. The diagnostic Raman peak at or slightly above ~521 cm–1 used to identify coesite is close to Raman peaks of contaminant crystalline Si0 from SiC grit (~521 cm–1), and to photoluminescence excitations of rare earth elements in xenotime; these excitations may also mimic a coesite peak at ~424 cm–1. To help avoid spurious recognition of diamond and coesite, we propose that surficial diamonds never be considered, that Si0 and xenotime should be ruled out when proposing a coesite identification using Raman spectroscopy alone, and that inclusions < 5 µm from the slide base generally be excluded from consideration.
      PubDate: Tue, 25 Jan 2022 00:00:00 +000
       
  • Adakite signatures in granitoids northwest of Shahr-e-Babak, Kerman, Iran:
           constraints from geochemistry

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      Abstract: Adakite signatures in granitoids northwest of Shahr-e-Babak, Kerman, Iran: constraints from geochemistryGhadami, Gholamreza; Nazarinia, Asma
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. 263 - 283AbstractGranitoid bodies are intruded in the northwestern part of the Dehaj-Sarduiyeh volcano-sedimentary belt, southeast of the Urumieh-Dokhtar Magmatic Arc in Iran. These rocks, with porphyritic texture consist mainly of diorite, tonalite and granodiorite rocks. Mineralogically, they consist mainly of plagioclase (andesine and oligoclase), K-feldspar (orthoclase), quartz, biotite and magnesio-hornblende. Whole rock geochemical analyses reveal subalkaline, calc-alkaline, metaluminous and I-type characteristics. The studied granitoids are enriched in LILEs (such as K, Cs, Sr, Pb) and depleted in HFSEs (such as Ti, Nb, P) similar to granitoids found at subduction zones. The geochemical characteristics of the studied granitoids such as their low Y (av. 8.80 ppm) content, high Sr content (av. 891 ppm), Sr/Y> 20 (av. 102) and no significant Eu anomalies, indicate their similarity with adakitic magma (Kuh-Panj type). The geochemical characteristics of the studied granitoids show their derivation from partial melting of a thickened, garnet bearing, amphibolitic lower continental crust in a subduction-related arc setting.
      PubDate: Tue, 25 Jan 2022 00:00:00 +000
       
  • Geochemical and fluid inclusion studies of Au and Cu bearing veins in the
           Hureh area, West Iran

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      Abstract: Geochemical and fluid inclusion studies of Au and Cu bearing veins in the Hureh area, West IranAhankoub, Maryam; Shabanian, Nahid; Davoudian, Alireza; Bagheri, Hashem; Nasiri, Masoumeh
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2022), p. 285 - 301AbstractThe Hureh Au-Cu veins are located north of Shahrekord, in the central part of the Sanandaj-Sirjan Zone (SaSZ). Mineralized country rocks consist of Mesozoic volcanic, sedimentary and low-grade metamorphic rocks. Main vein minerals are quartz, adularia, carbonates, pyrite, chalcopyrite, chalcocite, covellite, malachite, azurite, hematite, magnetite and goethite. Mineralization occurs as veins, vein swarms, stockwork, and as disseminated and breccia type with quartz, adularia, illite, calcite, hematite, chlorite and sericite as gangue minerals. The analyzed vein samples show up to 1343 ppm Au and> 10000 ppm Cu. The vein minerals reflect the near neutral-pH and reduced composition of the ore fluid. Micro-thermometric analyses show that the salinity of the ore-bearing fluid was between 6.74 and 10.74 wt% NaCl equiv. Fluid inclusion microthermometry indicates mineralization temperatures between 180° and 290 °C. Minimum pressure at the time of fluid entrapment is estimated at about 50 to 100 bars, equivalent to hydrostatic depths of 110 to 150 m. The main factors that gave rise to the Hureh mineralization are an island arc tectonic setting, presence of fractures and faults, and permeability of the country rocks. The Hureh mineralization can be classified as a low sulfidation epithermal system.
      PubDate: Tue, 25 Jan 2022 00:00:00 +000
       
  • Editorial

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      Abstract: EditorialRalf, Halama
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2021), p. 105 - 106
      PubDate: Fri, 22 Oct 2021 00:00:00 +000
       
  • The crystal structure of beryllonite from the type locality and comparison
           with isopointal structures

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      Abstract: The crystal structure of beryllonite from the type locality and comparison with isopointal structuresCallegari, Athos Maria; Boiocchi, Massimo; Zema, Michele; Tarantino, Serena Chiara
      Neues Jahrbuch für Mineralogie - Abhandlungen, (2021), p. 107 - 119AbstractThe crystal structure of beryllonite, NaBePO4, has been re-evaluated based on high-resolution X-ray diffraction data using a single crystal from the type locality, Stoneham (Maine, USA). Beryllonite is monoclinic, with a = 8.1309(2) Å, b = 7.7974(2) Å, c = 14.1918(4) Å, ß = 90.039(1)°, V = 899.76(4) Å3, space group P21/n (no. 14), Z = 12. Full anisotropic crystal-structure refinement converged to an R1 value of 0.0504 based on all 9435 unique reflections in the θ range 2–50°. The crystal structure consists of a framework of PO4 and BeO4 tetrahedra sharing all vertexes with adjacent tetrahedra. On the (010) plane, each tetrahedron shares three vertexes with three different tetrahedra forming a quasi-ditrigonal 63 net with alternating PO4 and BeO4 tetrahedra. The remaining vertex of each PO4 and BeO4 tetrahedra points outside the (010) plane and allows corner-linkage among the tetrahedral sheets. Na-centred polyhedra with six- and nine-fold coordinations are located in channels defined by the framework of tetrahedral rings. Beryllonite is isostructural with several natural and synthetic compounds and for these, a quantitative comparison of the crystal-chemical features is reported.
      PubDate: Fri, 22 Oct 2021 00:00:00 +000
       
 
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