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Soil gross N2O emission and uptake under two contrasting agroforestry systems: riparian tree buffer versus alley-cropping tree row Biogeochemistry (IF 4.0) Pub Date : 2024-05-16 Jie Luo, Lukas Beule, Guodong Shao, Dan Niu, Edzo Veldkamp, Marife D. Corre
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Soil C:N:P stoichiometric signatures of grasslands differ between tropical and warm temperate climatic zones Biogeochemistry (IF 4.0) Pub Date : 2024-05-16 Ángel Héctor Hernández-Romero, Yareni Perroni, Lázaro Rafael Sánchez Velásquez, Sergio Martínez-Hernández, Carlos Héctor Ávila-Bello, Xiaofeng Xu, Lihua Zhang
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Element mobility during basalt-water-CO2 interaction: observations in natural systems vs. laboratory experiments and implication for carbon storage Geochem. Trans. (IF 2.3) Pub Date : 2024-05-16 Pierangelo Romano, Lorenzo Brusca, Marcello Liotta
Today, carbon dioxide removal from the atmosphere is the most ambitious challenge to mitigate climate changes. Basalt rocks are abundant on the Earth’s surface (≈ 10%) and very abundant in the ocean floors and subaerial environments. Glassy matrix and minerals constituting these rocks contain metals (Ca2+, Mg2+, Fe2+) that can react with carbonic acid to form metal carbonates (CaCO3, MgO3 and FeCO3)
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Geochemical and depositional environment of an Upper Cretaceous greensand giant (Münsterland Cretaceous Basin, Germany) Chem. Geol. (IF 3.9) Pub Date : 2024-05-16 Markus Wilmsen, Udita Bansal, Niklas Metzner, Philipp Böning
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Assessing the spatiotemporal variability of dissolved organic matter fluorescence composition in the Lake George, NY watershed Biogeochemistry (IF 4.0) Pub Date : 2024-05-15 Aleksandar I. Goranov, Mark W. Swinton, David A. Winkler, Jeremy L. Farrell, Sandra A. Nierzwicki-Bauer, Sasha Wagner
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Trace element (Be, Zn, Ga, Rb, Nb, Cs, Ta, W) partitioning between mica and Li-rich granitic melt: Experimental approach and implications for W mineralization Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-05-10 Xu Gao, Julie Anne-Sophie Michaud, Zhenhua Zhou, Ingo Horn, Renat R. Almeev, Stefan Weyer, François Holtz
Mica is the most important carrier of rare alkalis (Li, Rb and Cs) and volatiles, and also a major host of rare metals such as Sn, W, Nb and Ta. Thus, the knowledge of trace element partitioning between mica and silicate melt is crucial to understand enrichment mechanisms of ore metals in evolved silicic systems. However, experimental data are scarce, mainly because the synthesis of large mica grains
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In situ investigation of the atomic structure of carbonate-silicate liquids at high pressure-temperature and spectroscopic characterization of the recovered quenched glasses Chem. Geol. (IF 3.9) Pub Date : 2024-05-10 Veronica Stopponi, Annalisa D'Arco, Yoshio Kono, Federica Piccirilli, Brent T. Poe, Stefano Lupi, Manuela Nazzari, Lucia Pappalardo, Giulia Marras, Michele Zacchigna, Craig E. Manning, Claudia Romano, Vincenzo Stagno
Carbonate-silicate melts that originate in Earth's interior are described as transitional melts which possess compositions intermediate between carbonatitic and basaltic end members. The covariation of key oxides between carbonatite and basalt (e.g., 10–35 wt% SiO and 40–10 wt% CO, respectively) is expected to have a strong effect on liquid properties. However, due to their paucity both in the record
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Has nitrogen availability decreased over much of the land surface in the past century? A model-based analysis Biogeochemistry (IF 4.0) Pub Date : 2024-05-03 Peter M. Vitousek, Xiaoyu Cen, Peter M. Groffman
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Contribution of marine macrophytes to pCO2 and DOC variations in human-impacted coastal waters Biogeochemistry (IF 4.0) Pub Date : 2024-05-04 Kenta Watanabe, Tatsuki Tokoro, Hirotada Moki, Tomohiro Kuwae
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Formation of deep arc root cumulates and implications for crustal growth in the southern Central Asian Orogenic Belt Chem. Geol. (IF 3.9) Pub Date : 2024-05-08 Yuanyang Yu, Keqing Zong, Kang Chen, Jing-Liang Guo, Xinshui Wang, Zaicong Wang, Wen Zhang, Zhaochu Hu, Yongsheng Liu
Formation of ultramafic cumulate rocks at the arc root serves as a key process to understanding the deep evolution of arc magma and crustal growth. However, the arc root cumulates are easy to delaminate due to their high density, making limited field exposure. Here, we conducted comprehensive petrographic observations and geochemical analysis of typical ultramafic rocks (peridotites and pyroxenites)
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Zircon Zr[sbnd]Hf isotope disequilibrium during crustal anatexis: A record from the Mesozoic migmatite in the eastern Gangdese arc, South Tibet Chem. Geol. (IF 3.9) Pub Date : 2024-05-08 Yunxuan Zhang, Liang Guo, Wen Zhang, Hongfei Zhang, Tao Luo
Stable zirconium (Zr) isotopes have become the focus of attention as potential tracers of magma crystallization and differentiation processes. However, the effects of partial melting, especially disequilibrium melting, on Zr isotope fractionation remain unclear. Here we report in-situ zircon UPb ages, major and trace elements, and ZrHf isotope data for the migmatites in the eastern Gangdese arc, South
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Tracing the Scale of Fluid Flow in Subduction Zone Forearcs: Implications from Fluid-Mobile elements Chem. Geol. (IF 3.9) Pub Date : 2024-05-08 Kristijan Rajič, Hugues Raimbourg, Austin M. Gion, Catherine Lerouge, Saskia Erdmann
Despite the importance of fluids in subduction zone processes, the extent of mass transfer and fluid circulation from the subducting plate through the forearc region remain unclear. To estimate the fluid budget and scale of fluid circulation in subducted sediments, we assess the distribution and retention of fluid-mobile elements (FME) in metamorphically equivalent metapelites from the Kodiak complex
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Geochemical and thermodynamic constraints on the genesis of coexisting alkaline and tholeiitic basalts from Datong, North China: Implication for compositional diversity of continental intraplate basalts Chem. Geol. (IF 3.9) Pub Date : 2024-05-07 Liang Zhou, Yu-Ping Su, Jian-Ping Zheng, Hong-Kun Dai, Qiang Ma, Xi Chen, Xia-Hui Zhang, Kai Xiong, Tian-Yi Niu, Gang Tong
Continental intraplate basalts usually exhibit diverse compositions varying from silica-deficient alkaline basalts to silica-excess tholeiites. However, the mechanism of compositional diversity remains controversial. Here, we conducted comprehensive petrology, mineral chemistry, whole-rock geochemistry, and Sr–Nd–Hf isotopic compositions, as well as thermodynamic modeling for the coexisting Datong
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Reaction calorimetry and structural crystal properties of non-ideal binary rhabdophane solid solutions (Ce1−xREExPO4·nH2O) Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-05-06 Alexander P. Gysi, Nicole C. Hurtig, Hannah Juan Han, Emma C. Kindall, Xiaofeng Guo, Dmitrii A. Kulik, George Dan Miron
Rhabdophane is a hydrous phosphate that commonly replaces monazite as a weathering product in critical mineral deposits during the alteration of rare earth elements (REE) bearing carbonatites and alkaline igneous complexes. It is an important host to the light (L)REE (i.e., La to Gd) but the stability and structure of binary solid solutions between the Ce and the other LREE endmembers have not yet
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Garnet stability during crustal melting: Implications for chemical mohometry and secular change in arc magmatism and continent formation Chem. Geol. (IF 3.9) Pub Date : 2024-05-05 Nick M.W. Roberts, Juan David Hernández-Montenegro, Richard M. Palin
Understanding how new felsic crust is formed and subsequently evolves through time is critical to identifying the geodynamic regimes that have dominated various parts of Earth history, and have important implications for feedbacks between the lithosphere and biosphere, such as controlling the influx of continental detritus into the oceans. In recent years, several trace element-based geochemical proxies
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A comparative study of the risk assessment and heavy metal contamination of coastal sediments in the Red sea, Egypt, between the cities of El-Quseir and Safaga Geochem. Trans. (IF 2.3) Pub Date : 2024-05-03 Ahmed R. Elgendy, Abd El Mohsen S. El Daba, Mohamed A. El-Sawy, Ahmed E. Alprol, Ghada Y. Zaghloul
This study aimed to assess the influence of pollution on the quality of sediments and the risks associated with El-Qusier and Safaga Cities, Red Sea, Egypt, during 2021, divided into four sectors, using multiple pollution indices. To achieve that, we evaluated the metal pollution index (MPI), contamination factor (Cf), pollution load index (PLI), contamination security index (CSI), and anthropogenicity
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Layered Archean lower continental crust: Constraints from granulite terrains and xenoliths Chem. Geol. (IF 3.9) Pub Date : 2024-05-03 Danqing Liu, Neng Jiang, Jinghui Guo, Lang Zhao, Jun Hu, Guangyu Huang, Peng Liu, Lihui Jia
Our understanding of crust–mantle differentiation is hampered by the large uncertainty in the composition of the inaccessible lower continental crust. The lower-crustal estimates derived from granulite terrains are compositionally much more evolved than those based on granulite xenoliths and there is no consensus on the origin of the compositional discrepancy. Here an integrated study of granulite
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High-resolution carbon and oxygen isotopic compositions of cultured brachiopods: Effect of pH, temperature and growth Chem. Geol. (IF 3.9) Pub Date : 2024-05-03 Claire Rollion-Bard, Hana Jurikova, Daniela Henkel
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Diagenetic iron-oxyhydroxides formed in suboxic to anoxic mine-impacted lake sediments near Sudbury, Ontario Chem. Geol. (IF 3.9) Pub Date : 2024-05-03 Birendra Sapkota, Tom Al
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Towards a better understanding of the geochemical proxy record of complex carbonate archives Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-05-01 M. Mueller, B.F. Walter, R.J. Giebel, A. Beranoaguirre, P.K. Swart, C. Lu, S. Riechelmann, A. Immenhauser
Carbonate archives record a brief snapshot of the ambient Earth’s surface conditions at their deposition. However, the geologically reasonable extraction and interpretation of geochemical proxy data from ancient, diagenetically altered rock archives is fraught with problems. Three issues stand out: the dichotomy between petrographic and geochemical alteration; the lack of quantitative age constraints
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Sampling Earth’s mantle at intra-transform spreading ridges Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-05-01 Camilla Sani, Alessio Sanfilippo, Sergey Skolotnev, Marco Ligi, Felix Genske, Andreas Stracke
The Doldrums transform system, located in the Equatorial Atlantic at 7–8°N, is a 110 km-wide multi-fault shear zone, with five active transform faults separated by four short intra-transform ridge segments (ITRs). The two central ITRs, ITR-2 and ITR-3, are significantly deeper than the peripheral ridge segments, suggesting differences in the thermal conditions of the sub-ridge mantle. New chemical
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Ancient melt percolation in forearc mantle pyroxenites: Evidence from highly siderophile elements and Os isotope ratios Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-05-01 Yang Xu, Chuan-Zhou Liu, Xuefa Shi
Pyroxenites, comprising only approximately 2 %–10 % by volume of the upper mantle, are among the most important lithological heterogeneity in the mantle. The formation of pyroxenite veins within peridotites is often attributed to migrating melts which provides an important mechanism for crust-mantle interaction. The Re–Os isotope system provides valuable insight into crust-mantle interaction, as there
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Changes in litter and nitrogen deposition differentially alter forest soil organic matter biogeochemistry Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-05-01 Isla Wrightson, Maryam Tabatabaei Anaraki, John Den Uyl, Knute J. Nadelhoffer, Kate Lajtha, Myrna J. Simpson
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Vermilion monazite: A new Archean reference material for U-Pb and Sm-Nd microanalysis Chem. Geol. (IF 3.9) Pub Date : 2024-05-01 Ariela Mazoz, Guilherme O. Gonçalves, Cristiano Lana, Ian S. Buick, Peter L. McSwiggen, Fernando Corfu, Sandra L. Kamo, Bin Fu, Hao Wang, Hugo Moreira, Ricardo Scholz, Lorena Martins, Eliza Peixoto, Elton Luiz Dantas, Roberto Ventura Santos
Monazite (Vermilion) from the ∼2.7 Ga Vermilion Granitic Complex (Minnesota, USA) was investigated as a potential reference material for U-Pb geochronology, using electron microprobe, high-precision ID-TIMS and high-spatial resolution techniques (LA-(Q/SF/MC)-ICP-MS and SHRIMP). Vermilion monazite is relatively homogeneous in BSE images. It is characterised as a monazite-(Ce) with uniform, relatively
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Granite weathering profiles accumulate vegetation-derived mercury Chem. Geol. (IF 3.9) Pub Date : 2024-05-01 Di Chen, Chengshuai Liu, Ting Gao, Bizheng Yang, Sae Yun Kwon, Runsheng Yin
Weathering of silicate rocks, particularly granitic rocks, generates the pedosphere that is of crucial importance in functioning terrestrial ecosystems. The pedosphere hosts large amounts of mercury (Hg). The source of Hg in granite weathering products is currently poorly constrained, however. Here we conducted Hg isotopic analyses on two weathering profiles developed on granitic plutons in Central
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Bison and cattle grazing increase soil nitrogen cycling in a tallgrass prairie ecosystem Biogeochemistry (IF 4.0) Pub Date : 2024-04-30 Nicholas Vega Anguiano, Kiona M. Freeman, Janaye D. Figge, Jaide H. Hawkins, Lydia H. Zeglin
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How does the burial rate control the diagenesis of sandstone? Insights from a diagenetic physical simulation experiment Chem. Geol. (IF 3.9) Pub Date : 2024-04-30 Sirui Chen, Benzhong Xian, Youliang Ji, Jiaqi Li, Naveed Ur Rahman, Rongheng Tian, Pengyu Wang
The study conducted physical simulation experiments on sandstone samples from the Junggar Basin to investigate how burial rates influence sandstone diagenesis and reservoir quality. Results show that the mechanical compaction under a negative burial rate (tectonic uplift) almost stops to destroy the sandstone reservoir space, the capacity of fluid seepage is the strongest and the sandstone tends to
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Terrestrial and marine POC export fluxes estimated by 234Th–238U disequilibrium and δ13C measurements in the East China Sea shelf Biogeochemistry (IF 4.0) Pub Date : 2024-04-29 Qiangqiang Zhong, Dekun Huang, Qiugui Wang, Jinzhou Du, Fule Zhang, Jing Lin, Tao Yu
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Silicon and oxygen isotope fractionation in a silicified carbonate rock Chem. Geol. (IF 3.9) Pub Date : 2024-04-29 Michael Tatzel, Marcus Oelze, Daniel A. Frick, Tommaso Di Rocco, Moritz Liesegang, Maria Stuff, Michael Wiedenbeck
Silicon isotope fractionation during silicification is poorly understood and impedes our ability to decipher paleoenvironmental conditions from Si isotopes in ancient cherts. To investigate isotope fractionation during silica-for‑carbonate replacement we analyzed the microscale Si and O isotope composition in different silica phases in a silicified zebra dolostone as well as their bulk δO and Δ’O compositions
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Unravelling the effects of magmatic fractionation, fluid phase separation and dilution on the composition of magmatic-hydrothermal fluids of the Cornubian Batholith (SW England) Chem. Geol. (IF 3.9) Pub Date : 2024-04-28 Mauro Bongiovanni, Tobias Fusswinkel, Michael A.W. Marks
The compositional evolution of magmatic-hydrothermal fluids from the SnW mineralized Cornubian batholith was investigated via in situ fluid inclusion LA-ICP-MS microanalysis and reveals a large degree of variation between intrusive stages and at the sample scale, with complexities due to superposition of several mechanisms affecting fluids chemistry during the protracted evolution of the batholith
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Dislocation-mediated interfacial re-equilibration of pyrite: An alternative model to interface-coupled dissolution-reprecipitation and gold remobilisation Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-27 Denis Fougerouse, Steven M. Reddy, Sumail, Joël Brugger, Nicolas Thébaud, William D.A. Rickard, Lin Yang, Zakaria Quadir, Malcolm P. Roberts, Andrew G. Tomkins, Laure Martin, Laura Petrella, Christopher R. Voisey
Minerals and/or their compositions (substituted minor elements) can become metastable in changing conditions or if formed outside of equilibrium. Unstable minerals undergo chemical and/or structural modifications at rates determined by re-equilibration processes, such as diffusion, coupled dissolution-reprecipitation and recrystallization. However, re-equilibrated domains with sharp contacts that lack
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Subsidy-stress responses of ecosystem functions along experimental freshwater salinity gradients Biogeochemistry (IF 4.0) Pub Date : 2024-04-26 Stephen E. DeVilbiss, Brian D. Badgley, Erin R. Hotchkiss, Meredith K. Steele
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Petrogenesis of submarine volcanic arc rocks from Andaman subduction zone, Northeast Indian Ocean: Constraints from slab components and mantle wedge characteristics Chem. Geol. (IF 3.9) Pub Date : 2024-04-26 Bhagyashree Doley, Abhishek Saha, M. Ram Mohan, Koushick Sen, Aditya Peketi
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Corrigendum to “Biomarker evidence for wildfire activity in surface soils from Mt. Yulong on the southeastern Tibetan Plateau: Sources and controls” [Chemical Geology 652 (2024) 122022] Chem. Geol. (IF 3.9) Pub Date : 2024-04-26 Yangzhuang Li, Yan Bai, Chihao Chen, Qinghu Chen, Xiaomin Fang, Xiaoming Liu, Zhijun Liu
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Late Quaternary marine transgressions off the Shandong Peninsula inferred from paleosalinity indicators: Implications for Holocene mud wedge formation Chem. Geol. (IF 3.9) Pub Date : 2024-04-25 Xin Chang, Xiting Liu, Tiegang Li, Zhifang Xiong, Baichuan Duan, Jie Huang, J. Paul Liu, Mingyu Zhang, Aimei Wang, Houjie Wang
Mud depocenters play an important role in the sediment source–sink system of marginal seas; however, the factors controlling the formation of mud deposits are not well understood. This study focused on Core LHSD-1, which is located on the southern margin of the Shandong Peninsula mud wedge in the northwestern part of the South Yellow Sea. Elemental ratios, such as the C/S ratio (the mass ratio of total
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Surface water oxygenation and low bioproductivity during deposition of iron formation of the Jacadigo Group (Brazil): Insights from combined cadmium – Chromium isotopes Chem. Geol. (IF 3.9) Pub Date : 2024-04-25 Robert Frei, Claudio Gaucher, Paulo César Boggiani, Jesper Allan Frederiksen, Samantha Renee Walker, Henrique Albuquerque Fernandes, Fabricio Caxito
The Banda Alta Formation (Urucum district, Mato Grosso do Sul, Brazil) comprises ∼600 Ma Fe and Mn deposits, which are among the world's youngest and largest Neoproterozoic sedimentary Fe and Mn formations (IF; MnF). These have been deposited in a redox-stratified, marine sub-basin (Jacadigo Basin), which was strongly influenced by glacial advance/retraction cycles with temporary influx of continental
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Boron in wildfires: New insights into boron isotope fractionation during volatilisation, leaching and adsorption after combustion Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-24 Shawn Lu, Anthony Dosseto, Damien Lemarchand
Wildfires are hazards of increasing significance in recent decades. Our ability to forecast the evolution of fire regimes is inhibited by the lack of records of key fire parameters such as fire severity. Boron isotopes in the soil clay fraction have been shown to vary with fire severity, where increased B coincides with higher fire severity. To elucidate the relationship between the B isotope composition
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Dynamics of methane emissions from northwestern Gulf of Mexico subtropical seagrass meadows Biogeochemistry (IF 4.0) Pub Date : 2024-04-23 Hao Yu, Richard Coffin, Hannah Organ
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Discovery of abundant shock-induced metallic lead nanograins in lunar zirconolite Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-21 Ai-Cheng Zhang, Hao-Xuan Sun, Tian-Ran Trina Du, Jia-Ni Chen, Li-Xin Gu
The behaviors of radiogenic Pb in Zr-minerals are critical for reconstructing the chronological framework for the evolutionary history of our Earth and other planetary bodies. Previous investigations have revealed the presence of Pb nanograins in some terrestrial zircons and attributed it to radiation decay of U and mobilization and accumulation in zircon and a subsequent thermal metamorphic event
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Elemental composition of smectite minerals in continental rise sediments from the Amundsen Sea, West Antarctica, as a tool to identify detrital input from various sources throughout late Quaternary glacial-interglacial cycles Chem. Geol. (IF 3.9) Pub Date : 2024-04-21 Young Kyu Park, Claus-Dieter Hillenbrand, Werner Ehrmann, Hanbeom Park, Julia S. Wellner, Jennifer R. Horrocks, Jinwook Kim
Detrital smectite is a ubiquitous clay mineral in marine sediments and has a variable total Fe, Al, and Mg composition depending on the source, i.e., bedrock or unconsolidated sedimentary strata, the smectite is derived from. Analyses of elemental composition of smectite minerals in marine sediments can help to differentiate the smectite sources and, thus, sediment provenance, with potentially far-reaching
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Carbon-Sulfur isotope and major and trace element variations across the Permian–Triassic boundary on a shallow platform setting (Xiejiacao, South China) Chem. Geol. (IF 3.9) Pub Date : 2024-04-21 Zijie Zheng, Zhong-Qiang Chen, Stephen E. Grasby, Xue Wang, Dominic Papineau, Ziheng Li, Xiangdong Wang, Lei Zhang, He Zhao, Yuangeng Huang, Xueqian Feng, Lewei Su, Zhen Guo
We examined microbialites deposited near the Permian–Triassic boundary (PTB) at the Xiejiacao section of South China, including the size and morphology of pyrite framboids, carbonate carbon isotopes (δC), carbonate associated sulfur isotope (δS), major and trace elements, and total organic carbon (TOC) concentrations. The microbialite unit is much thicker than the PTB beds in deeper water sections
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Effect of discretization choices when modeling the thermo-chemical history of the accreting core Chem. Geol. (IF 3.9) Pub Date : 2024-04-21 Vincent Clesi, Renaud Deguen
Different discretizations methods applied to models of core/mantle segregations are tested (single stage, multistage accretion, results of N-body simulations) in order to test the sensitivity of the thermo-chemical coupling to the type of discretization used. We found that while single stage and large discretization of segregation steps yield very different core temperature, multistage models of accretion
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The impact of Himalayan-Tibetan erosion on silicate weathering and organic carbon burial Chem. Geol. (IF 3.9) Pub Date : 2024-04-21 Peter D. Clift, Tara N. Jonell, Yifan Du, Thomas Bornholdt
Cenozoic mountain building in Asia has been proposed as an important control over global climate by atmospheric CO drawdown through silicate weathering and burial of organic carbon (OC) offshore. Because Asian submarine fans represent the most complete record of Asian orogenic erosion and weathering over the Cenozoic, evaluation of sediment major element chemistry and OC content can be used to estimate
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A spectroscopic study of the stability of uranyl-carbonate complexes at 25–150 °C and re-visiting the data available for uranyl-chloride, uranyl-sulfate, and uranyl-hydroxide species Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-20 A. Migdisov, E. Bastrakov, C. Alcorn, M. Reece, H. Boukhalfa, F.A. Capporuscio, C. Jove-Colon
The stabilities of uranyl-carbonate and uranyl-hydroxide aqueous complexes were experimentally determined at temperatures ranging from 25 to 125 °C using in situ UV–vis and Raman spectroscopic techniques. Combined with earlier determinations of the stability of chloride, sulfate, and hydroxide complexes at temperatures up to 250 °C, these data permit to create a consolidated dataset suitable for modeling
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Insights on the origin of oldhamite in enstatite meteorites from Ca stable isotopes Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-20 Wei Dai, Frederic Moynier, Julien Siebert
In order to understand the origin of oldhamite (CaS) in enstatite meteorites, we report Ca isotopic compositions (Ca) of oldhamite (obtained from water leachate of bulk chondrites and aubrites and mineral separates from the Norton County aubrite) and silicate minerals from different types of enstatite chondrites and aubrite. The Ca of the bulk enstatite chondrites range from 1.05 ‰ to 1.24 ‰, with
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Rewet without regret? Nutrient dynamics in fen peat exposed to different rewetting degrees Biogeochemistry (IF 4.0) Pub Date : 2024-04-20 Annick van der Laan, Jerry van Dijk, Karin T. Rebel, Martin J. Wassen
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An experimental simulation of oxygen isotope exchange reaction between amorphous silicate dust and carbon monoxide gas in the early Solar System Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-18 Daiki Yamamoto, Noriyuki Kawasaki, Shogo Tachibana, Lily Ishizaki, Ryosuke Sakurai, Hisayoshi Yurimoto
The reaction mechanism and kinetics of oxygen isotope exchange between tens of nanometer-sized amorphous silicate grains with forsterite composition (amorphous forsterite) and low-pressure carbon monoxide (CO) gas () of 0.05–1 Pa at 643–883 K were examined to investigate oxygen isotopic evolution in the protosolar disk that led to the mass-independent oxygen isotopic variation of planetary materials
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Drought-induced turnover of soil microbial biomass increases nutrient subsidies for the reproduction of tropical forest Biogeochemistry (IF 4.0) Pub Date : 2024-04-17 Kazumichi Fujii, Chie Hayakawa, Sukartiningsih
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Aquifer-CO2 leak project. Effect of CO2-rich water percolation in porous limestone cores: Simulation of a leakage in a shallow carbonate freshwater aquifer Chem. Geol. (IF 3.9) Pub Date : 2024-04-17 David Segura, Adrian Cerepi, Corinne Loisy
Carbon capture and storage (CCS) is a promising technology for reducing greenhouse gas emissions, however, leakage of CO constitutes a major concern for aquifers. Despite abundant literature on petrophysical and geochemical changes at storage conditions, few studies address the impact of CO leakage on petrophysical and at aquifer-like pressures, flow rates and temperatures. The aim of the paper is
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Densely populated biofilms and linked iron and sulfur cycles in the fractured-rock continental subsurface Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-16 Christopher J. Schuler, Amanda Patsis, Scott C. Alexander, David Hsu, William S. Dowd, Woonghee Lee, Sarick L. Matzen, Matthew A. Marcus, Cody S. Sheik, Jill M. McDermott, Peter K. Kang, Cara M. Santelli, Brandy M. Toner
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Tidally driven porewater exchange and diel cycles control CO2 fluxes in mangroves on local and global scales Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-16 Alex Cabral, Yvonne Y.Y. Yau, Gloria M.S. Reithmaier, Luiz C. Cotovicz Jr., João Barreira, Göran Broström, Bárbara Viana, Alessandra L. Fonseca, Isaac R. Santos
Mangrove soils are highly enriched in organic carbon. Tidal pumping drives seawater and oxygen into mangrove soils during flood tide and releases carbon-rich porewater during ebb tides. Here, we resolve semi-diurnal (flood/ebb tides), diel (day/night) and weekly (neap/spring tides) drivers of porewater-derived CO fluxes in two mangroves and update global estimates of CO emissions building on earlier
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Constraints on lunar regolith resurfacing from coupled modeling of stochastic gardening and neutron capture effects Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-16 Justin Y. Hu, Ingo Leya, Nicolas Dauphas, Auriol S.P. Rae, Helen M. Williams
The regolith evolution of airless bodies, like the Moon, is primarily controlled by impact cratering. Since the Apollo Era, measurements of cosmic ray exposure (CRE)-induced Sm and Gd isotopes in lunar drill cores have provided insights into the secondary neutron spectra in the lunar regolith. Since the production and transport of secondary neutrons vary with the regolith’s chemical composition and
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Trends in estuarine pyrite formation point to an alternative model for Paleozoic pyrite burial Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-16 Kalev Hantsoo, Maya Gomes, Dana Brenner, Jeffrey Cornwell, Cindy M. Palinkas, Sairah Malkin
The early Paleozoic Era (∼540–420 Ma) was an interval of profound biogeochemical changes including increasing oxygen (O) and the onset of bioturbation (sediment mixing by animals). It is hypothesized that incipient bioturbation caused a monotonic decrease in sedimentary burial of pyrite (FeS), which would have slowed atmospheric O accumulation. However, pyrite accumulation can exhibit complex responses
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Position-specific and clumped isotope equilibria in propane: Ab initio calculations beyond the harmonic and Born-Oppenheimer approximations Chem. Geol. (IF 3.9) Pub Date : 2024-04-16 Xinya Yin, Yining Zhang, Qi Liu, Alexis Gilbert, Feixiang Liu, Caihong Gao, Siting Zhang, Moira K. Ridley, Yun Liu
Position-specific and clumped isotope compositions that reveal intramolecular isotope distributions can offer novel insights into the physical and chemical properties of substances. In particular, the intramolecular isotope effects observed in propane have demonstrated significant potential for constraining the formation and evolution of hydrocarbons. To calibrate measurements and interpret observations
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The effects of water-flooding and wet-to-dry transition on phase transformation of schwertmannite chemically formed in constant pH condition Chem. Geol. (IF 3.9) Pub Date : 2024-04-16 Baoting Ding, Jianru Liang, Yan Dong, Mingjiang Zhang, Lixiang Zhou
Schwertmannite formed under constant pH maintained by alkali additives exhibits great arsenic (As) adsorption capacities and has been used to remediate As-contaminated soil. However, variable soil moisture contents probably induce the phase transformation of schwertmannite, consequently affecting the environmental fate of contaminants in the mineral. This study investigates the effects of extreme water
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Experimental constraints on formation of silica-rich igneous rims around chondrules in CR chondrites Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-15 Aimee Smith, Rhian H. Jones
Silica-rich igneous rims (SIRs) occur commonly as an outer rim layer on porphyritic chondrules in CR (Renazzo-like) chondrites, as well as more rarely in other chondrite groups. Formation conditions for SIRs can provide insight into chemical and physical conditions in the chondrule-forming region of the protoplanetary disk, as well as helping to understand temporal changes to successive thermal events
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Towards a new impact geochronometer: Deformation microstructures and U-Pb systematics of shocked xenotime Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-15 Cilva Joseph, Denis Fougerouse, Aaron J. Cavosie, Hugo K.H. Olierook, Steven M. Reddy, Tommaso Tacchetto, Raiza R. Quintero, Allen Kennedy, David W. Saxey, William D.A. Rickard
Shock-deformation microstructures in xenotime have been proposed to record diagnostic evidence for meteorite impacts. Evaluating the potential for impact-induced U-Pb age resetting of the various microstructures that form in shocked xenotime remains largely unexplored. In this study, we investigate the U-Pb systematics of shocked xenotime from three impact structures, including Vredefort (South Africa)
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Reduction and transformation of Cr(VI)-associated ferrihydrite by Shewanella oneidensis MR-1: Kinetics and secondary minerals Geochim. Cosmochim. Acta (IF 5.0) Pub Date : 2024-04-14 Shiwen Hu, Qi Wang, Hanyue Zhang, Yang Yang, Guojun Chen, Shan Wang, Chongxuan Liu, Tongxu Liu
Hexavalent chromium (Cr(VI)) could be sequestrated by soils via microbial reduction to Cr(III) and association with minerals, however, quantitative understanding of metal reducing bacteria on the coupled kinetics of Cr and Fe minerals is still lacking. Here, microbial-mediated ferrihydrite transformation and reductive sequestration of Cr(VI) were investigated with MR-1 under varying Cr/Fe ratios. Quantitative
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Phosphorus dynamics in an ice-covered lake: Insights from geochemical gradients in water and sediments Chem. Geol. (IF 3.9) Pub Date : 2024-04-12 Md Samrat Alam, Arthur Zastepa, Maria Dittrich
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Wildfire effects on the fate of deposited nitrogen in a boreal larch forest Biogeochemistry (IF 4.0) Pub Date : 2024-04-11 Weili Liu, Jiaxing Zu, B Liu, Lin Qi, Wei Huang, Yunting Fang, Jian Yang