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Geochimica et Cosmochimica Acta
IF
4.26
Papers
22824
Papers 22995
1 page of 2,300 pages (23k results)
Newest
#1Yi-Xiang ChenH-Index: 14
#2Wenning Lu (China University of Geosciences)H-Index: 1
Last.Kun ZhouH-Index: 3
view all 9 authors...
Abstract Fluids released by subducting slabs are important to the geochemical evolution of Earth’s crust-mantle system. However, it is still not well constrained for the mobility of redox sensitive elements (like Fe, C or S) in subduction zone fluids, and its effect on the redox property of the overlying mantle wedge and its derived arc magmas. Iron isotope fractionation is sensitive to the redox state and speciation of Fe in fluids, which can potentially provide clues on the oxygen fugacity (fO...
#1Magdaléna Knappová (Charles University in Prague)H-Index: 2
#2Petr Drahota (Charles University in Prague)H-Index: 17
Last.Tomáš MatoušekH-Index: 21
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Abstract Microbial sulfidogenesis plays a potentially important role in As biogeochemistry within wetland soils, sediments, and aquifers. This study investigated the effects of microbial sulfidogenesis on As mineralogy in the As-enriched wetland soil found at the natural geochemical anomaly of the Smolotely-Lisnice (Czech Republic) historical gold district. The distribution and speciation of As as a function of soil depth, and the metabolic properties of microbial communities in different sulfid...
#1Jing Wei (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 2
#2Erkan Ibraim (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 1
Last.Joachim Mohn (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 19
view all 5 authors...
Abstract Chemodenitrification can be a substantial abiotic source of nitrous oxide (N2O) in soil. The isotopic signature of N2O from this process could support source partitioning, but it is currently unknown in sufficient detail. In this study, we determined the isotopic composition of N2O, produced by the reaction of nitrite (NO2−) with lignin, four lignin derivatives, and three types of soils, online with a quantum cascade laser absorption spectrometer (QCLAS). We present the first dataset of...
#1Abu Saeed Baidya (Jadavpur University)H-Index: 1
#2Dipak Pal (Jadavpur University)H-Index: 8
Last.Dewashish Upadhyay (IITs: Indian Institutes of Technology)H-Index: 17
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Abstract The chemical weathering of rocks and minerals on the Earth’s surface leads to the mobilization and redistribution of elements and has (a) significant control on the chemistry of the soil-hydrosphere-atmosphere system, (b) a profound effect on the bioavailability and toxic effects of elements, and (c) applications in mineral exploration among others. In this study, we describe the sequential weathering of spessartine- and pyrope-bearing almandine garnet in metamorphosed banded magnetite ...
#1Thomas W. Evans (University of Bremen)H-Index: 3
#2Sarah Coffinet (University of Bremen)
Last.Kai-Uwe Hinrichs (University of Bremen)H-Index: 48
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Abstract Distributional patterns of intact polar lipids (IPLs) suggest that archaea are abundant in marine subsurface sediments. However, the production of archaeal lipids remains largely unresolved. We performed a lipid radioisotope probing (lipid-RIP) experiment using 14C-bicarbonate and 2-14C-acetate with surface and methanogenic marine sediments from the Rhone delta (Mediterranean Sea) to investigate mechanisms of carbon assimilation and to assess biomass production of benthic archaea. The d...
#1Xin‐Song Wang (McGill University)
#2Alexander Timofeev (McGill University)H-Index: 4
Last.Xianwu Bi (CAS: Chinese Academy of Sciences)H-Index: 25
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Abstract The solubility of tungsten trioxide solid and the speciation of tungsten in NaCl-bearing solutions have been investigated through experiments conducted at 250, 300, and 350 °C under vapour-saturated water pressure. Based on the results of these experiments, the solubility of tungsten trioxide was controlled by temperature and pH, whereas the NaCl concentration did not affect the solubility except through its influence on the ionic strength of the solution. Two tungsten species were foun...
#1Martin R. Lee (Glas.: University of Glasgow)H-Index: 33
#2B.E. Cohen (Glas.: University of Glasgow)H-Index: 13
Last.R. C. Greenwood (OU: Open University)H-Index: 30
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Abstract Lewis Cliff (LEW) 85311 is classified as a Mighei-like (CM) carbonaceous chondrite, yet it has some unusual properties that highlight an unrealised diversity within the CMs, and also questions how many parent bodies are sampled by the group. This meteorite is composed of rimmed chondrules, chondrule fragments and refractory inclusions that are set in a fine-grained phyllosilicate-rich matrix. The chondrules are of a similar size to those in the CMs, and have narrow fine-grained rims. LE...
#1Karen H. Johannesson (Tulane University)H-Index: 25
#2Ningfang Yang (Tulane University)H-Index: 4
Last.Christopher D. White (Tulane University)H-Index: 29
view all 10 authors...
Abstract Arsenic (As) concentrations and speciation were measured in groundwaters from the upper Chicot aquifer in southern Louisiana to: 1) ascertain the geochemical processes responsible for its mobilization into the groundwater; and 2) investigate the fate and transport of As in the aquifer following its mobilization into solution. Ancillary geochemical parameters, including dissolved iron (Fe) concentrations and speciation, major solutes, pH, and alkalinity were also quantified in the ground...
#1Drew D. Syverson (Yale University)H-Index: 4
#2Barbara Etschmann (Monash University)H-Index: 4
Last.Joël Brugger (Monash University)H-Index: 36
view all 8 authors...
Abstract This study examines the oxidation and coordination of lead (Pb) in the uranium (U) minerals uraninite (UO2), coffinite (USiO4), and brannerite (UTi2O6), and minerals that have U as a minor constituent, zircon (ZrSiO4) and titanite (CaTiSiO5). The characterization of Pb was conducted through a combination of micro-synchrotron X-ray fluorescence mapping (µSXRF) and micro-X-ray absorption spectroscopy (µXAS), collected at the Pb LII and LIII edge on characterized grains (electron microscop...
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