Geochemistry & Geophysics

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Article Geochemistry & Geophysics

Quantitative analysis of cyclone-induced storm surges and wave characteristics over Andaman Islands for improved Disaster Risk Reduction

Hamid Varikkodan, S. Balaji, S. Arjun

Summary: This study evaluated the surge heights and wave characteristics of a cyclone storm event in the Andaman Islands in November 2013. The results showed higher surges on the east coast and stronger waves on the right side of the cyclone.

DYNAMICS OF ATMOSPHERES AND OCEANS (2024)

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Article Geochemistry & Geophysics

Miocene olivine leucitites in southern Tibet: Implications for the recycling of carbonates into the mantle during continental subduction

Ming Lei, Michele Lustrino, Jifeng Xu, Zhiqiang Kang, Zhengfu Guo, Jianlin Chen

Summary: This study presents a comprehensive geochronological, mineralogical, and geochemical analysis of olivine leucitites in the Maiga area of southern Tibet, suggesting that these rocks originate from a carbonated peridotite mantle source and highlighting the possibility of carbonates being recycled deep into the mantle during continental subduction.

CHEMICAL GEOLOGY (2024)

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Article Geochemistry & Geophysics

Phosphate oxygen isotopes constrain Mesoproterozoic marine temperatures and the paucity of phosphorite

Yuntao Ye, Xiaomei Wang, Huajian Wang, Haifeng Fan, Zhigang Chen, Qingjun Guo, Ziteng Wang, Chaodong Wu, Donald E. Canfield, Shuichang Zhang

Summary: Phosphorus is an essential element for life and its cycle in the ocean is closely connected with the carbon and oxygen cycles. The study of phosphate oxygen isotopes can provide insights into various reactions related to phosphorus. By analyzing carbonate fluorapatite samples from the Mesoproterozoic Era in North China, it was found that the oxygen isotope values were lower compared to modern samples, indicating a warmer climate during that time period and a potential reason for the scarcity of phosphorite.

CHEMICAL GEOLOGY (2024)

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Article Geochemistry & Geophysics

Effect of mineral growth rate on Zinc incorporation into calcite and aragonite

Jean-Michel Brazier, Katja E. Goetschl, Martin Dietzel, Vasileios Mavromatis

Summary: This study estimated the distribution coefficient of Zn2+ between calcite/aragonite and reactive fluids and found that the growth rate strongly influences D-Zn(2+) in both minerals. Additionally, a linear correlation was found between D-Zn(2+) and the saturation degree of the reactive fluid.

CHEMICAL GEOLOGY (2024)

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Article Geochemistry & Geophysics

Geochemical variations of anatectic melts in response to changes of P-T-H2O conditions: Implication for the relationship between dehydration and hydration melting in the Himalayan orogen

Min Ji, Xiao-Ying Gao, Yong-Fei Zheng, Bing Gong

Summary: The study examines the anatectic mechanisms in the Himalayan orogen, finding that pressure and temperature control the reaction, while water content mainly affects the solid-phase composition. Dehydration and hydration melting likely occur at different depths in the crust. This research provides important insights into the melting processes in collisional orogens.

CHEMICAL GEOLOGY (2024)

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Article Geochemistry & Geophysics

Preservation of organic C and N isotope signatures from water column to sediments in the anoxic and ferruginous Pavin lake

Vincent Busigny, Oanez Lebeau, Didier Jezeduel, Carine Chaduteau, Sean Crowe, Magali Ader

Summary: This study conducted high-precision Mo isotope research on hydrothermal metal sulfides from a porphyry copper deposit in Southwest China and found that different stages of mineralization have distinct Mo isotope compositions, providing valuable insights into the behavior of Mo isotopes in magmatic-hydrothermal systems.

CHEMICAL GEOLOGY (2024)

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Article Geochemistry & Geophysics

Metasomatized mantle source of nascent oceanic crust in the Guaymas Basin, Gulf of California

Zhen-Min Ge, Xiao-Long Huang, Wei Xie, Tobias W. Hofig, Fan Yang, Yang Yu, S. Khogenkumar Singh

Summary: The mantle source composition of the nascent oceanic crust in the central part of the Gulf of California has been investigated using basaltic glass samples. These samples show trace element patterns similar to enriched mid-ocean ridge basalts, suggesting that the nascent oceanic crust in the Guaymas Basin might be generated through partial melting of a depleted mantle source metasomatized by subducted slab materials.

CHEMICAL GEOLOGY (2024)

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Article Geochemistry & Geophysics

Linking rates of slab sinking to long-term lower mantle flow and mixing

Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman

Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Shallow sources of upper mantle seismic anisotropy in East Africa

C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja

Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Trace element evidence for diverse origins of superheavy pyrite in Neoproterozoic sedimentary strata

Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao

Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.

GEOCHIMICA ET COSMOCHIMICA ACTA (2024)

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Article Geochemistry & Geophysics

Concordance of V-in-olivine and Fe-XANES oxybarometry methods in mid-ocean ridge basalts

Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter

Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Uranium isotopes in non-euxinic shale and carbonate reveal dynamic Katian marine redox conditions accompanying a decrease in biodiversity prior to the Late Ordovician Mass Extinction

Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall

Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.

GEOCHIMICA ET COSMOCHIMICA ACTA (2024)

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Article Geochemistry & Geophysics

Iron isotope evidence in continental intraplate basalts for mantle lithosphere imprint on heterogenous asthenospheric melts

Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu

Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Calcium isotopes track volatile components in the mantle sources of alkaline rocks and associated carbonatites

Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu

Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Cosmogenic (un-)steadiness revealed by paired-nuclide catchment-wide denudation rates in the formerly half-glaciated Vosges Mountains (NE France)

Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team

Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Correction Geochemistry & Geophysics

Serpentinite fluids and slab-melting in the Aleutian arc: Evidence from molybdenum isotopes and boron systematics (vol 603, 117970, 2023)

Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Eoarchean ultramafic rocks represent crustal cumulates: A case study of the Narssaq ultramafic body, southern West Greenland

Lingyu Zhang, Kristoffer Szilas

Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.

EARTH AND PLANETARY SCIENCE LETTERS (2024)

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Article Geochemistry & Geophysics

Mesoarchean synchronous emplacement of TTG gneisses and potassic granitoids in the Nyabessane granite-greenstone terranes, NW Congo Craton (southern Cameroon): Zircon U-Pb geochronology, petrogenesis and tectonic implications

Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame

Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.

LITHOS (2024)

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Article Geochemistry & Geophysics

The role of magmatic-to-carbohydrothermal processes in rare earth mineralization in Hogenakkal carbonatites, India

Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal

Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.

LITHOS (2024)

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Article Geochemistry & Geophysics

Heavy metal(loid)s contamination and ecotoxicological hazards in coal, dust, and soil adjacent to coal mining operations, Northwest Pakistan

Imran Ud Din, Said Muhammad, Shah Faisal, Inayat ur Rehman, Wajid Ali

Summary: The presence of heavy metal contamination in coal mines and surrounding environments in the Hangu and Kurram districts poses potential risks to the environment and human health.

JOURNAL OF GEOCHEMICAL EXPLORATION (2024)

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