-
Whole-rock geochemical and zircon U-Pb-Hf isotopic compositions of the Yunlougang and Wucun granitic plutons in the Hetai area of South China: Implications for petrogenesis and geodynamic setting Geochemistry (IF 3.7) Pub Date : 2024-02-24 Lixing Wang, Deru Xu, Hai Lin, Xinyu Wang, Genwen Chen, Qianqian Jiao
In the Nanling tectono-magmatic belt of South China, the geodynamic settings and tectonic style of Indosinian and Yanshanian magmatism remain debatable. Hereby, an integrated study of zircon U-Pb ages and Lu-Hf isotopes as well as whole-rock elemental and Sr-Nd isotopic compositions was carried out on the Yunlougang (Late Permian) and the Wucun (Late Jurassic) granitic plutons in the Hetai area, located
-
Significance of highly siderophile element and Re–Os isotope systematics in global carbonatites Geochemistry (IF 3.7) Pub Date : 2024-02-23 Ladislav Polák, Lukáš Ackerman, Tomáš Magna, Vladislav Rapprich, Michael Bizimis, R. Johannes Giebel, Sven Dahlgren, Shrinivas Viladkar
The systematics of highly siderophile elements (HSE) in carbonatites have rarely been investigated although carbonatite melts are among key metasomatic agents in the Earth's mantle. Thus, establishing the Os isotope systematics of carbonatites is of prime importance because carbonatite metasomatism might play a determining role in driving Os/Os signature of the Earth's mantle as a consequence of extreme
-
A comprehensive evaluation of OPTICS, GMM and K-means clustering methodologies for geochemical anomaly detection connected with sample catchment basins Geochemistry (IF 3.7) Pub Date : 2024-02-23 Mahsa Hajihosseinlou, Abbas Maghsoudi, Reza Ghezelbash
The process of data-driven clustering to uncover geochemical anomalies linked to sample catchment basins (SCBs) includes a comprehensive framework to discern areas exhibiting unique geochemical attributes within a specified study area. The Ordering Points to Identify the Clustering Structure (OPTICS) method can serve as a robust methodology for detecting geochemical anomalies in SCBs. This is attributed
-
Recognition of REEs anomalies using an image Fusion fractal-wavelet model in Tarom metallogenic zone, NW Iran Geochemistry (IF 3.7) Pub Date : 2024-02-21 Mohammad Mahdi Pourgholam, Peyman Afzal, Ahmad Adib, Kambiz Rahbar, Mehran Gholinejad
This study aims to detect REE geochemical anomalies in relationship to Iron-apatite ores utilizing an image Fusion based on Deep Learning (FDL). The geochemical data was modeled for elements related to Iron-apatite mineralization using multi b Spline B. The results were fusioned in applying the Deep learning method based on pre-trained networks. Wavelet-Number (WN) fractal model classified the best
-
Monazite and zircon U Pb and muscovite 40Ar/39Ar geochronology constraints on the timing of magmatism and mineralization in the Huxingshan tungsten deposit, South China Geochemistry (IF 3.7) Pub Date : 2024-02-15 Lei Zhu, Bin Li, An-Huai Lu, De-Xian Zhang, Jun-Wei Xu
The Huxingshan W deposit (0.21 Mt. WO @ 0.3 %) in northeastern Hunan province is located at the western margin of the Jiangnan tungsten belt (JNB), South China. It consists of a series of magma-derived scheelite-quartz-muscovite (SQM) veins in the F1 fault (which contains over 60 % of the W resource), beneath Niutitang Formation (Fm.) carbonate rocks, and above Yijiaqiao Fm. slate (sub-economic), distal
-
Evolution of beryllium minerals in granitic pegmatite Maršíkov D6e, Czech Republic: Complex breakdown of primary beryl by internal and external hydrothermal-metamorphic fluids Geochemistry (IF 3.7) Pub Date : 2024-02-15 Štěpán Chládek, Milan Novák, Pavel Uher, Petr Gadas, Dalibor Matýsek, Peter Bačík, Radek Škoda
-
U-Pb and Re-Os geochronology and lithogeochemistry of granitoid rocks from the Burnthill Brook area in central New Brunswick, Canada: Implications for critical mineral exploration Geochemistry (IF 3.7) Pub Date : 2024-02-08 Nadia Mohammadi, David R. Lentz, Kathleen G. Thorne, Jim Walker, Neil Rogers, Brian Cousens, Christopher R.M. McFarlane
The Burnthill Brook area of central New Brunswick contains four Late Devonian intrusions (Burnthill, Buttermilk Brook, Dungarvon, and Sisters Brook plutons) and is emplaced into greenschist-facies Cambro-Ordovician graphite-bearing meta-sedimentary rocks of Miramichi Group and/or Middle Ordovician bimodal metavolcanic rocks of the Tetagouche Group. To help resolve the complex nature of molybdenite
-
Mineral chemistry and thermobarometry of the pre-rift Upper Cretaceous to Paleocene melilite-bearing dykes from the northern part of the Bohemian Massif (Ploučnice River region): Implications for compositional variations of spinels from ultracalcic melts Geochemistry (IF 3.7) Pub Date : 2024-02-08 David Buriánek, Kamil Kropáč, Yulia V. Erban Kochergina
-
Formation and evolution of metapelitic-derived melts within anatectic complexes: Geochemical constraints and inferences on the protoliths and geodynamics of the Porto-Viseu Metamorphic Belt, Central Iberian Zone (central-north Portugal) Geochemistry (IF 3.7) Pub Date : 2024-02-07 B. Cotrim, T. Bento dos Santos, M.R. Azevedo, P. Cachapuz, D. Carvalho, M. Benoit
Migmatite formation is dependent of several and inter-related factors, such as P-T conditions, protolith composition and the abundance of volatiles, which usually hinders the full understanding of anatectic progression and how it relates to orogenic evolution. We have constrained the petrological evolution of the anatectic complex (mostly metatexites and diatexites) of the Porto-Viseu Metamorphic Belt
-
Stable isotope geochemistry evidences from fossil carbonate and sulfur minerals on the origin of geothermal water, Kızıldere Geothermal Field, Western Turkey Geochemistry (IF 3.7) Pub Date : 2024-02-06 Gülcan Bozkaya, Ömer Bozkaya, Taylan Akın
The Kızıldere geothermal field, located at the eastern part of the Büyük Menderes graben in Western Turkey, is the most important geothermal reservoir suitable for electricity generation. Current and fossil fumaroles and alteration zones are directly related to the tectonic zones influenced by N-S directional extension since Miocene period. Associated to fossil geothermal activities carbonate (calcite
-
Mobilization of rare earth elements during extreme weathering of basalt Geochemistry (IF 3.7) Pub Date : 2024-02-03 Sinjan Roy, Shiba Shankar Acharya, Ramananda Chakrabarti
To investigate the mobility of elements during extreme weathering of basalts, major and trace elements concentrations along with the mineralogical abundance of weathered products, are reported for lateritic profiles developed over the ~118.1 ± 0.3 Ma old Rajmahal Trap basalts in Eastern India. Special emphasis has been given to studying the re-distribution of rare earth elements during extreme chemical
-
Fluid inclusion, mineralogical, geochemical, and isotopic (O, S) evidence for the genesis of the Khan-Khatun Zn-Pb deposit, Tabas Block, Iran Geochemistry (IF 3.7) Pub Date : 2024-01-26 Abdulmajid Jamili, Balandeh Aminzadeh
The Khan-Khatun ZnPb deposit is located in the southeast margin of the Tabas Block of the Central Iranian Microcontinent. The stratabound ZnPb mineralization is of epigenetic origin and hosted by the Late Cretaceous limestones. The ore deposition occurred in structural open spaces and much less as a disseminated replacement in carbonate rocks. The deposit consists of sulfide and non-sulfide base metal
-
Multistage evolution of the Aladağ mantle peridotites (S-Turkey): Processes of partial melting and melt-peridotite interaction in Mid-Ocean Ridge and Subduction Zones Geochemistry (IF 3.7) Pub Date : 2024-01-18 Samet Saka, Ibrahim Uysal, Hans-Michael Seitz, Dirk Müller
The Aladağ ophiolite is located in the eastern Taurides, north of the city of Adana, southern Turkey and, from bottom to top, is composed of mantle peridotites, ultramafic-mafic cumulates, isotropic (massive) gabbro and diabase dykes. Mantle peridotites are represented by varying degrees of serpentinized dunite, harzburgite and lherzolite. We studied 100 lherzolite, harzburgite and dunite samples representing
-
Gold and sulfide-bearing listvenite in the mantle section of the Tays ophiolite in the Arabian shield, Saudi Arabia Geochemistry (IF 3.7) Pub Date : 2024-01-17 Fahad Alshehri, Mokhles K. Azer, Paul D. Asimow, Bassam A. Abuamarah
The mantle section of the Late Neoproterozoic Tays ophiolite in the Arabian Shield consists principally of thoroughly serpentinized peridotite with characteristics typical of depleted mantle protoliths from a fore-arc environment. The serpentinite is altered along shear zones and thrust planes to gold-bearing listvenite bodies of various sizes. These bodies are divided into carbonate listvenite and
-
REE and trace element mobility during the transformation of basalt to laterite and bauxite, Payas Province, Türkiye Geochemistry (IF 3.7) Pub Date : 2024-01-16 Hüseyin Öztürk, Zeynep Cansu, Cem Kasapçı, Nurullah Hanilçi, David Banks
The bauxites of the Payas area in the eastern Mediterranean region of Turkey occur as a stratigraphically continuous layer between Early and Late Cretaceous shallow marine carbonates. The laterites represent an in situ formation and mark a key stratigraphic layer in the region. Bauxite pockets are also present in the laterites, formed from the reworking of the laterites and accumulated in depressions
-
Reactions in UHT calc-silicate granulites from the In Ouzzal terrane (Western Hoggar, South Algeria): Implication for pressure-temperature-fluid evolution Geochemistry (IF 3.7) Pub Date : 2024-01-15 Nadia Boureghda, Khadidja Ouzegane, Saïda Aït-Djafer, Jean-Robert Kienast, Abderrahmane Bendaoud, Amar Arab, Zouhir Adjerid
Calc-silicate granulites constitute a relatively small part of the whole granulitic material outcrops characterizing the In Ouzzal terrane (NW Hoggar, South Algeria). However, these rocks preserve a number of spectacular reaction textures that could be effectively used to infer their pressure-temperature-fluid history. These textures are interpreted using P-T and T-XCO2 grids in the simplified CaO-Al2O3-SiO2-Vapor
-
Mineralogical and geochemical characteristics of alteration minerals related to fossil geothermal activities in the Kızıldere geothermal field, Western Turkey Geochemistry (IF 3.7) Pub Date : 2024-01-15 Ömer Bozkaya, Gülcan Bozkaya, Taylan Akın, Halil Atan
The Kızıldere geothermal field, located at the eastern part of the Büyük Menderes graben in Western Turkey, is the most important geothermal reservoir suitable for electricity generation. Fossil fumarole fields and alteration or mineralization zones are directly related to the tectonic zones influenced by N-S directional extension. Associated to fossil geothermal activities, calcite, dolomite, strontianite
-
U–Pb zircon dating, Sr-Nd whole-rock and Lu-Hf zircon isotope analyses of the Eocene Arslandede pluton, Eastern Pontides, NE Turkey: Implications for mantle source and magma evolution Geochemistry (IF 3.7) Pub Date : 2024-01-15 Abdullah Kaygusuz, Zikrullah Samet Güloğlu, Emre Aydınçakır, Cem Yücel, Alaaddin Vural, Wolfgang Siebel, Youn-Joong Jeong
The Eastern Pontide Orogenic Belt (EPOB) hosts numerous plutonic bodies with different dimensions, compositions and ages ranging from Paleozoic to Late Eocene in NE Turkey. U-Pb zircon dating suggests that the Arslandede pluton crystallized at 44.50 ± 0.29 Ma, corresponding to the Lutetian (Middle Eocene) period. Rocks of this pluton have monzonitic character, with compositions ranging from monzodiorite
-
The layered gabbroic intrusion in the Southern Eastern Desert of Egypt: Implications for Fe-Ti-rich magmatism at the end of the East African Orogeny Geochemistry (IF 3.7) Pub Date : 2024-01-09 Mohamed Zaki Khedr, Christoph Hauzenberger, Tomoaki Morishita, Akihiro Tamura, Abdullah O. Bamousa, Scott A. Whattam, Shehata Ali
-
The geochemistry of leucite-bearing lavas from early stages of the Somma-Vesuvius volcanic complex: Feeder systems and mantle enrichment processes in the Neapolitan district of the Roman Magmatic Province Geochemistry (IF 3.7) Pub Date : 2024-01-08 Vincenza Guarino, Roberto Solone, Martina Casalini, Luigi Franciosi, Luigi Dallai, Vincenzo Morra, Sandro Conticelli, Leone Melluso
The lavas of the Mt. Somma volcanic epoch were erupted during the early stage of the Somma-Vesuvius volcanic complex. These lavas are mildly differentiated with the presence of plagioclase-clinopyroxene-olivine- ± leucite-bearing lavas (leucite tephrites, leucite-bearing shoshonites, latites), also characterized by low in MgO, Cr and Ni, with a Sr-Nd-isotope range (87Sr/86Sr = 0.706865–0.707861; 143Nd/144Nd = 0
-
Geochemical variations in early Islamic glass finds from Bukhara (Uzbekistan) Geochemistry (IF 3.7) Pub Date : 2024-01-07 Nadine Schibille, Catherine Klesner, Daniel R. Neuville, Sören Stark, Asan I. Torgoev, Sirojiddin J. Mirzaakhmedov
Glass manufacturing processes and recipes changed fundamentally after the 8th century CE. The earlier centralised production system diversified, primary production sites multiplied, and the scale of individual productions contracted. Mineral soda was no longer used and instead replaced by plant ash as the main network modifier, affecting the chemical composition and properties of the glass. In this
-
Multiple mineralization events recorded in the Dahenglu CuCo deposit, eastern North China Craton: Constraints from ReOs and UPb geochronology Geochemistry (IF 3.7) Pub Date : 2024-01-03 Yong Zhang, Yande Tai, Lixing Li, Chao Li, Yingli Zhang, Quanheng Song, Siyu Liu
The formation of sediment-hosted CuCo deposits remains controversial, in part due to the lack of a precise age for CuCo mineralization. The Dahenglu deposit is located in the eastern part of the Jiao–Liao–Ji Belt (JLJB), one of the famous sedimentary–metamorphic-type CuCo deposits in China, that is mainly hosted within Palaeoproterozoic epimetamorphic rocks. The orebodies occur as stratoid, lenticular
-
A record of overpressure and Sevier tectonics within beef calcite of the Heath Formation, Central Montana Trough Geochemistry (IF 3.7) Pub Date : 2023-12-30 Alex M. Washburn, Paul J. Sylvester, Kathryn E. Snell
The Central Montana Trough is an important sedimentary basin for petroleum resources and as a record of North American tectonism. The thermal, overpressure, and tectonic histories of the trough are investigated through a study of beef calcite veins taken from the Heath Formation, the primary hydrocarbon source rock of the basin. Results from beef calcite analysis include petrographic characterization
-
What do we know about the natural sources, transport and sinks of antimony in the environment? Geochemistry (IF 3.7) Pub Date : 2023-12-21 Juraj Majzlan, Montserrat Filella
Limited attention has been given to antimony present in detrital form in the different environmental compartments except for highly polluted systems related in some way to ore deposits. In highly polluted systems, the ultimate sinks of Sb may be the minerals tripuhyite (FeSbO4) or perhaps schafarzikite (FeSb2O4) but how about Sb dynamics in the much more abundant, weakly polluted or ‘non-polluted’
-
Zircon UPb and Hf isotope insights into the Mesoproterozoic breakup of supercontinent Columbia from the Sausar Belt, Central Indian Tectonic Zone Geochemistry (IF 3.7) Pub Date : 2023-12-20 Swayoma Bose, R. Anand, Joseph D'Souza, Michael Hartnady, Chris Kirkland, Ellen Kooijman
Credible records of rifting and associated sedimentation and granitoid magmatism coinciding with the Columbia breakup event are not common in the Precambrian Indian continent. We report a 1322 ± 3 Ma concordia age for magmatic zircons from the granitoid rocks of the Sausar mobile belt, Central Indian Tectonic Zone (CITZ). The rocks exhibit geochemical characteristics of A-type granitoid rocks and were
-
-
Chemical and boron isotope composition of tourmaline from Koktokay pegmatite, Altay Orogenic Belt, Northwest China: Implications for metallogenic mechanism and prospecting indicator for rare-metal pegmatites Geochemistry (IF 3.7) Pub Date : 2023-12-17 Beiqi Zheng, Meihua Chen, Yuyang Zhang
The metallogenesis of Li-rich pegmatites remains contentious and an innovative approach for exploring such deposits is needed. The well-known Koktokay pegmatites in the Altay Orogenic Belt exhibit various mineralization degrees and patterns. In this study, we conducted systematic elemental and boron isotope analyses on five tourmaline samples to decipher the metallogenic mechanism and prospecting indicators
-
Geochronology and petrochemistry of Karabiga pluton in western Sakarya Zone (NW Turkey): Implications from new zircon U-Pb and biotite Ar/Ar ages, Sr-Nd isotope data and bulk-rock geochemistry Geochemistry (IF 3.7) Pub Date : 2023-12-11 Şenel Özdamar, Oral Sarıkaya, Naşide Merve Sütçü, Haibo Zou, Sarah Sherlock
The closure of the Neo-Tethys Ocean and the following continental collision produced extensive Eocene-aged granitic plutons in the northern margin of Gondwana. This paper deals with the geochronology and petrogenesis of the Karabiga pluton in western Sakarya Zone. The pluton comprises K-feldspar, plagioclase, hornblende, biotite, quartz and accessory minerals (e.g., titanite, zircon, apatite, opaques)
-
-
In Memoriam: Klaus Heide, 1938–2023 Geochemistry (IF 3.7) Pub Date : 2023-12-08 Astrid Holzheid, Falko Langenhorst
Abstract not available
-
Physicochemical conditions of the evolution of the volcanic-hosted Zn-Pb ± Cu epi-mesothermal vein-type deposit and its contribution to the understanding of western Anatolian metallogeny, NW Turkey Geochemistry (IF 3.7) Pub Date : 2023-12-04 Farhad Javid, Emin Ciftci, Amr Abdelnasser
This study focuses on the evolution of the Kirazlıyayla volcanic-hosted Zn-Pb ± Cu epi-mesothermal vein-type deposit and its relationship to volcanism in NW Turkey. The Kirazlıyayla area has an extensive variety of geological formations, including the Karakaya, Yenipazar, Fındıcak, Sarısu Volcanics, and Mesudiye. The mineralization that formed within the Sarısu Volcanics at Kirazlıyayla mine area exhibits
-
Fluid evolution and genesis of the Zhuanghuhe Au–Sb mineralization in the Duobaoshan orefield, Northeast China: Evidence from fluid inclusions and H–O–C isotopes Geochemistry (IF 3.7) Pub Date : 2023-11-28 Han-wen Xue, Ke-yong Wang, Jian-zhen Geng, Si-wen Fan, Jun-chi Chen, Xue Wang
-
The bimodal Fii-A2-type and calc-alkaline volcanic sequence of the Aljustrel brownfield region, Iberian Pyrite Belt, SW Iberian Massif Geochemistry (IF 3.7) Pub Date : 2023-11-28 João Lains Amaral, Ana Rita Solá, Telmo M. Bento dos Santos, Lorena Feitoza, Colombo Tassinari, Lourenço Crispim, Martim Chichorro, Mandy Zieger-Hofmann, Jessica Gärtner, Ulf Linnemann, João Gonçalves
The Iberian Pyrite Belt (IPB) is a late Devonian – Early Carboniferous world-class polymetallic VMS province that includes significant Cu-(Sn)-Pb-Zn-Ag deposits of massive sulphides and feeder zones. The Aljustrel brownfield region contains one of the highest concentrations of ore in the IPB in 6 known deposits (Gavião, São João, Moinho, Algares, Estação and Feitais). To delve into the petrogenesis
-
Comet 81P/Wild 2: A record of the Solar System's wild youth Geochemistry (IF 3.7) Pub Date : 2023-11-28 Ryan C. Ogliore
NASA's Stardust mission returned rocky material from the coma of comet 81P/Wild 2 (pronounced “Vilt 2”) to Earth for laboratory study on January 15, 2006. Comet Wild 2 contains volatile ices and likely accreted beyond the orbit of Neptune. It was expected that the Wild 2 samples would contain abundant primordial molecular cloud material—interstellar and circumstellar grains. Instead, the interstellar
-
Fe and S isotopes variation of pyrite from hydrothermal mineralization in the Zijinshan region in Fujian Province, SE China Geochemistry (IF 3.7) Pub Date : 2023-11-23 Yu-Xuan Zhou, Bin Li, Zhi-Yong Zhu, Hai-Xiang Zhao
The Zijinshan district, Fujian Province, southeastern China, is a globally renowned CuAu orefield and hosts a wide variety of ore deposits within the Zijinshan granite complex and surrounding volcano-sedimentary rocks. We performed FeS isotope analysis on pyrite separates from the Zijinshan high-sulfidation epithermal deposit, Yueyang intermediate-sulfidation epithermal deposit, Wuziqilong transition-type
-
New Pb isotopic data from Japanese hydrothermal deposits for tracing heavy metal sources Geochemistry (IF 3.7) Pub Date : 2023-11-21 Mizuki Ishida, Koichiro Fujinaga, Masaharu Tanimizu, Tsuyoshi Ishikawa, Kazuya Nagaishi, Yasuhiro Kato
Lead isotopes are useful in determining the source of metals in environment, and studies on lead isotopic characteristics of mineral deposits have provided important insights for economic geologists, archaeologists and environmental scientists over the past 50 years. This study reports new Pb isotope and trace element data of sulfide minerals from 25 mineral deposits in Japan in order to partly update
-
Geochronology and petrogenesis of granitoids from the Bas Draa Inlier (Western Anti-Atlas, Morocco): Revived debate on the tectonic regime operating during early Paleoproterozoic at the NW edge of the West African Craton Geochemistry (IF 3.7) Pub Date : 2023-11-10 Fatiha Askkour, Moha Ikenne, Cyril Chelle-Michou, Brian L. Cousens, Sava Markovic, Mehdi Ousbih, Mustapha Souhassou, Hafida Elbilali, Richard Ernst
-
A new insight into metasomatism through mass-density-solid volume variation maps Geochemistry (IF 3.7) Pub Date : 2023-11-04 Stephen Centrella
In order to present a new petrological approach to quantify mass transfer redistribution, especially regarding chemical zonation, published data of a centimeter sized aluminium-rich clinopyroxene from the Bergen Arcs in Norway is used. The sample comes from the island of Holsnøy where the dry granulite-facies protolith underwent hydration reaction under amphibolite-facies conditions. This aluminium-rich
-
Geochemistry, Sr-Nd isotopes and zircon U-Pb dating of magmatic rocks from the Talesh range, western Alborz: New insights into Late Cretaceous evolution of the southern Eurasian margin Geochemistry (IF 3.7) Pub Date : 2023-11-02 Khadijeh Amani, Morteza Delavari, Sadraddin Amini, Hossein Azizi, Yoshihiro Asahara, Tanya Furman, Amir Ali Tabbakh Shabani, Abbas Asiabanha, Ali Mohammadi
-
Geology, mineralogy, and alteration of the Cu-Pb veins, and their significance in mineral exploration: A case study in the Khajeh-Nezam area, SE Iran Geochemistry (IF 3.7) Pub Date : 2023-10-25 Afshin Akbarpour, Majid Vanaei, Behnam Sadeghi
-
LA-ICP-MS U-Pb cassiterite age data of the Sadisdorf deposit link Sn-Li-(W-Cu) mineralization in the eastern Erzgebirge to the collapse of the Altenberg-Teplice Caldera Geochemistry (IF 3.7) Pub Date : 2023-10-21 Dino Leopardi, Axel Gerdes, Richard Albert, Jens Gutzmer, Bernd Lehmann, Mathias Burisch
-
Mineralogy, fluid inclusion and stable isotope characteristics of the inlice (Konya, Turkey) high sulfidation epithermal gold deposit: Implications for hydrothermal evolution and ore genesis Geochemistry (IF 3.7) Pub Date : 2023-10-18 Mustafa Haydar Terzi, Erkan Yılmazer, İlkay Kuşcu, Tolga Oyman, Sercan Bozan
The Inlice high sulfidation epithermal gold deposit with 262,300 oz of gold ore is located in the Erenlerdağ-Alacadağ Volcanic Complex (EAVC) at the northern part of central Taurides. The volcanic succession of the study area is stratigraphically represented by andesite, block and ash flow, basaltic andesite lava flow and andesite lava flow. The deposit consists of seven neighboring mineralized veins
-
Critical metals distribution in the late Triassic–early Jurassic Nasr-Abad bauxite deposit, Irano–Himalayan karst bauxite belt, NW Iran Geochemistry (IF 3.7) Pub Date : 2023-10-18 Ali Abedini, Maryam Khosravi, Giovanni Mongelli
In the late Triassic–early Jurassic Nasr-Abad deposit, bauxite ores are bauxitic iron ore and Fe-rich bauxite, grading into bauxite and clayey bauxite upward the succession. The ores mainly consist of a mineral assemblage of diaspore, hematite, kaolinite, and rutile. Conservative elemental ratios of provenance, such as Eu/Eu*, Sm/Nd, and Nb/Ta, suggest a derivation from a mafic protolith, although
-
In situ simultaneous Fe K-edge XAS spectroscopy and resistivity measurements of riebeckite: Implications for anomalous electrical conductivity in subduction zones Geochemistry (IF 3.7) Pub Date : 2023-10-06 Giancarlo Della Ventura, Federico Galdenzi, Augusto Marcelli, Giannantonio Cibin, Roberta Oberti, Frank C. Hawthorne, Simone Bernardini, Boriana Mihailova
-
GWOKM: A novel hybrid optimization algorithm for geochemical anomaly detection using grey wolf optimizer and K-means clustering model Geochemistry (IF 3.7) Pub Date : 2023-10-05 Mehrdad Daviran, Reza Ghezelbash, Abbas Maghsoudi
Identifying the geochemical signatures of valuable mineral deposits using regional geochemical data from stream sediments is a challenging task due to the intricate characteristics of geological formations. Our team is currently investigating the potential of unsupervised clustering analysis (CA) and hybridization with a novel grey wolf optimizer (GWO) in developing multi-element geochemical models
-
Decoding the control of active tectonics on the sedimentary budget of a Himalayan River basin: Insights from Sr and Nd isotopic compositions (87Sr/86Sr, εNd) of bed sediments Geochemistry (IF 3.7) Pub Date : 2023-09-18 Satyabrata Das, Santosh K. Rai, Waliur Rahaman, Saurabh Singhal, Sandeep Panda, Shushanta Sarangi
The interaction between climate and tectonics chiefly governs the erosion and sedimentary budget in the tectonically active Himalayan Mountain chain. In the present study, the relative contribution from the various litho-tectonic units of the Himalaya to the sedimentary budget of the Teesta River System (TRS) (a major tributary of the Brahmaputra system) has been deciphered using the Sr and Nd isotopic
-
Data-centric approach for predicting critical metals distribution: Heavy rare earth elements in cretaceous Mediterranean-type karst bauxite deposits, southern Italy Geochemistry (IF 3.7) Pub Date : 2023-08-28 Roberto Buccione, Ouafi Ameur-Zaimeche, Abdelhamid Ouladmansour, Rabah Kechiched, Giovanni Mongelli
-
Formation of barite in the Ab Torsh deposit, Kerman province, Iran: Insights from rare earth elements, O and S isotopes, and fluid inclusions Geochemistry (IF 3.7) Pub Date : 2023-08-23 Hossein Kalantar Hormozi, Farhad Ehya, Ghodratollah Rostami Paydar, Sara Maleki Kheymehsari
Barite can form in a variety of geological environments, as it occurs in a wide range of mineral deposits. To determine the origin and physicochemical conditions under which the Ab Torsh barite deposit formed, an extensive study was conducted using petrographic, Rare Earth Element (REE) geochemical, O and S isotopic, and fluid inclusion methods. Barite mineralization occurs at Ab Torsh as a stratabound
-
Origin, dynamics, and chemical evolution of garnet-bearing leucogranitic magma, Eastern Desert of Egypt: Controls on the rare-metal enrichment in the A-type magmatism Geochemistry (IF 3.7) Pub Date : 2023-08-23 Nasser M. Mahdy, Tsuyoshi Iizuka, Victoria Pease, Mohamed M. Ghoneim, Amr A. Abdel Hamid
Egypt hosts numerous rare-metal granites, i.e., highly evolved granites enriched in rare metals (Ta, Nb, Be, Sn, Zr, Th, and REE). However, the processes involved in the rare-metal enrichment are not fully understood. We present new data on the textural characteristics and chemical composition of rare-metal mineralization associated with microgranite dikes in the Ras Abdah area of the Egyptian Eastern
-
Zeolitized fossil woods from alkaline volcaniclastic rocks: Unravelling an uncommon mineralization process Geochemistry (IF 3.7) Pub Date : 2023-08-22 Jakub Mysliveček, Vít Koutecký, Vladislav Rapprich, Jakub Sakala, John M. Hora, František Laufek, Ondřej Pour, Zsolt Benkó, Tomáš Magna
Mineralization of fossil woods with unusual mineral phases remains an underconstrained process despite its relatively common occurrences. Aside from common mineralization agents such as silica or carbonates, there are also atypical mineralization associations, such as zeolite-group phases, but the zeolitization process has not yet been investigated in detail. We studied zeolitized woods collected from
-
Formation of tourmaline in the Bakoshi-Gadanya Goldfield, Nigeria: Insights from elemental compositions and boron isotopes Geochemistry (IF 3.7) Pub Date : 2023-08-11 Safiyanu Muhammad Elatikpo, Huan Li, Thomas J. Algeo, Nuerkanati Madayipu, Landry Soh Tamehe, Yanick Brice Lemdjou
Tourmaline and gold mineralization form an association in the Bakoshi-Gadanya (BAG) Goldfield on the northern West Nigerian Subshield, located in the southern Trans-Saharan Orogenic Belt of West Africa, although the cogenicity of this association remains untested. In this study, we report the results of an integrated study of the boron isotopic and major- and trace-elemental compositions of BAG tourmalines
-
Influences of subduction derived fluids and melt in the genesis of Nidar ophiolite peridotites, Ladakh Himalaya, India: Evidence from mineralogy, PGE and Nd isotopic compositions Geochemistry (IF 3.7) Pub Date : 2023-08-06 Ranjit Nayak, Debasis Pal, Sakthi Saravanan Chinnasamy, Manavalan Satyanarayanan, Santosh Kumar, Jitendra Dash, Pratap Chandra Sethy, Akhin Mohan
The Nidar ophiolite is one of the well-preserved and almost complete ophiolite sections of the Neo-Tethyan oceanic lithosphere, obducted along the continental margin between the Indian and the Eurasian plate. This ophiolite sequence is mostly dominated by ultramafic rocks, consisting of forearc-related refractory, mainly harzburgite, dunite, and serpentinite, with minor intrusions of lherzolite, chromitites
-
Geochemical evidence for west-flowing paleo-Yamuna River in northwest India during the late Quaternary and its implication for the Harappan Civilization Geochemistry (IF 3.7) Pub Date : 2023-08-03 Mohd Amir, Debajyoti Paul, P. Anchana, Mohd Tarique, Waliur Rahaman
Like the paleo-Sutlej River, the paleo-Yamuna River has been hypothesized as a major tributary of the mighty Ghaggar-Hakra (Vedic Saraswati) River and its eastward migration to the modern Yamuna course linked to the deurbanization of the Harappan (Indus) Civilization that peaked ~4.0–3.9 thousand years before present (ka). Here we provide detrital Sr and Nd isotope variabilities in two ~48 m and one
-
Isotope diffusion and re-equilibration of copper and evaporation of mercury during weathering of tetrahedrite in an oxidation zone Geochemistry (IF 3.7) Pub Date : 2023-08-02 Juraj Majzlan, Julia Herrmann, Martin Števko, Jan G. Wiederhold, Marina Lazarov, Rastislav Milovský
To understand the mobility of heavy metals during oxidative weathering of sulfides, we investigated weathering processes of tetrahedrite [(Cu,Fe,Zn,Hg)12(Sb,As)4S13] in an oxidation zone with abundant siderite (FeCO3) and baryte (BaSO4) at Rudňany (Slovakia). The focus of this work lied in the isotopic (δ65Cu, δ202Hg, δ34S) variations of the minerals during weathering and the interpretation of such
-
U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sediments of northern-central Tibetan Plateau: Implications for the closure of the Jinshajiang Ocean Geochemistry (IF 3.7) Pub Date : 2023-07-27 Qiankun Liang, Huan Kang, Yuelong Chen, Huazhen Zhang, Dan Wang
-
Unsupervised machine learning based prospectivity analysis of NW and NE India for carbonatite-alkaline complex-related REE deposits Geochemistry (IF 3.7) Pub Date : 2023-07-25 Malcolm Aranha, Alok Porwal, Ignacio González-Álvarez
Rare Earth Elements (REE) form critical raw materials in environment-friendly, high-technology devices and components, and therefore have been classified as “critical minerals and metals” by most countries. About 62 % of the global resources of REE occur associated with carbonatite-alkaline complexes; however, the entire production of REE in India currently comes from secondary deposits, even though
-
Geochemistry, petrogenesis, and tectonic setting of the Cúcamo mafic and intermediate volcanic rocks from the Ahualulco Volcanic Complex, San Luis Potosí, Mexico Geochemistry (IF 3.7) Pub Date : 2023-07-23 Sanjeet K. Verma, Darío Torres-Sánchez, Leidy Carolina Sandoval-Espinel, Karla Rubí Hernández-Martínez, Mayank Shukla, Sonia A. Torres-Sánchez, José R. Torres Hernández, Hector Lopéz-Loera, Priscila Soledad Zandomeni
The Ahualulco Volcanic Complex (AVC) is situated in the north-central part of the San Luis Potosí Volcanic Field (SLPVF) that is found in the southern portion of the Mesa Central (MC). The Cúcamo, AVC is mainly composed of mafic and intermediate volcanic rocks. The present study focuses on understanding the evolution, origin, and magmatic processes and petrogenesis of mafic and intermediate rocks in
-
Hydrogeological conditions and hydrogeochemistry of the Kamenskoye hydro-radon occurrence, Novosibirsk, Russia Geochemistry (IF 3.7) Pub Date : 2023-07-17 D.A. Novikov, F.F. Dultsev, A.A. Maximova, A.S. Derkachev, A.V. Chernykh
Hydrogeological and hydrogeochemical conditions, the concentrations of major and some minor ions and 222Rn were determined in the Kamenskoye hydro-radon occurrence in the Southern part of West Siberia. Two different aquifer systems were revealed in the hydrogeological section: the Quaternary sediments with pore waters and the Upper Paleozoic granites including the waters of regional fracturing zone
-
Micro-Raman mapping of critical metals (Li, Co, Ni) in a rhythmically laminated deep-ocean ferromanganese deposit Geochemistry (IF 3.7) Pub Date : 2023-07-08 Simone Bernardini, Giancarlo Della Ventura, Armida Sodo, Mariana Benites, Luigi Jovane, James R. Hein, Federico Lucci
Deep-ocean ferromanganese deposits represent one of the most important strategic reservoirs for rare and critical metals. In particular, Mn-oxyhydroxides, such as asbolane and lithiophorite, concentrate large amounts of Li, Ni, and Co into polymetallic nodules and crusts. However, because of their poor crystallinity and the presence of finely intermixed additional phases, these minerals cannot be unambiguously
-
Variation of δ15N in Indian coal, lignite and peat Geochemistry (IF 3.7) Pub Date : 2023-07-06 Madhurima Ganguly, Supriyo Kumar Das, Alf Ekblad, Pravat Kumar Behera
Nitrogen (N) stable isotope ratio (δ15N) in coal organic matter (OM) provides information on the N source and dominant mechanisms affecting isotopic fractionation during coalification. However, published data on δ15N distribution in coal is rare. The present study is one of the first reports on the δ15N composition of peat, lignite, sub-bituminous and anthracite coals in India and one of the first