Showing papers in "Geochimica et Cosmochimica Acta in 2022"

TL;DR: In this article, the authors present a systematic investigation of K contents and stable K isotopic compositions of surface waters, groundwater, wastewaters, suspended particles, bed sediments, and fertilizers in the Upper Mun Rive catchment, northeast Thailand.

TL;DR: In this paper , the authors present a systematic investigation of K contents and stable K isotopic compositions of surface waters, groundwater, wastewaters, suspended particles, bed sediments, and fertilizers in the Upper Mun Rive catchment, northeast Thailand.

TL;DR: In this paper , the authors determine the partition coefficient of Sn between aqueous fluids and granitic melts (DSnfluid/melt) at 800 °C, 150 MPa and the fO2 of the Ni-NiO buffer.

TL;DR: In this article, the authors determined the partition coefficient of Sn between aqueous fluids and granitic melts (D S n f l u i d / m e l t ) at 800 ÂC, 150 ÂMPa and the fO2 of the Ni-NiO buffer.

TL;DR: In this paper , in situ trace element analysis of apatite in 60 granitoid plutons from the eastern Central Asian Orogenic Belt (CAOB) was performed.

TL;DR: The authors identified a brGDGT-producing strain Candidatus Solibacter usitatus Ellin6076, by identifying archaeal tetraether synthase homologs in bacterial genomes.

TL;DR: In this paper , the bulk-rock chemical composition of the newly returned CE-5 (CE-5) lunar soil was studied to understand its chemical homogeneity, exotic additions, and origin of landing site basalts.

TL;DR: In this article , the authors employ a Monte Carlo approach to model the evolution of the Ce anomaly in zircon as a function of temperature, fO2, and melt composition, and compare their model with literature ZIRcon data from chemically well-constrained volcanic rocks.

TL;DR: In this paper , a new global terrestrial brGDGT temperature calibration from a worldwide extended dataset (i.e. 775 soil and peat samples) using a machine learning algorithm was developed.

TL;DR: In this paper , the ages and oxygen three-isotope ratios of fifteen FeO-poor chondrules from the least metamorphosed (CM) and Ornans-like (CO) carbonaceous chondrites, Asuka 12236 (CM2.9), Dominion Range 08006 (CO 3.01), and Yamato 81020 (CO3.05), were reported.

TL;DR: In this paper , the authors report new HSE abundance data and 187Os/188Os ratios, in conjunction with mineral chemistry and bulk rock major and trace-element compositions for abyssal peridotites from the fast-spreading Pacific Antarctic Ridge (PAR) and East Pacific Rise (Hess Deep), and for slow to intermediate spreading ridges from the Southwest Indian Ridge, Central Indian Ridge and Mid-Atlantic Ridge.

TL;DR: In this article, multiple sulfur isotope ratios were measured for porewater sulfate, sulfide, elemental sulfur and pyrite from core samples collected from continental shelf (19-96 m water depth) in the Baltic Sea and slope (1098 m water depths), in order to test if their isotope systematics can be used to trace the two different sulfate reduction processes.

TL;DR: In this article , the synchronous sequestration mechanism of cadmium (Cd) and fulvic acid (FA) during Fe(II)-catalyzed transformation ferrihydrite with C/Fe molar ratio of 0.21 were examined.

TL;DR: In this paper, the authors report new HSE abundance data and 187Os/188Os ratios, in conjunction with mineral chemistry and bulk rock major-and trace-element compositions for abyssal peridotites from the fast-spreading Pacific Antarctic Ridge (PAR) and East Pacific Rise (Hess Deep), and for slow to intermediate spreading ridges from the Southwest Indian Ridge, Central Indian Ridge and Mid-Atlantic Ridge.

TL;DR: In this paper , the authors measured multiple sulfur isotope ratios for porewater sulfate, sulfide, elemental sulfur and pyrite from core samples collected from continental shelf and slope (1098 m water depth) in the Andaman Sea, in order to test if their isotope systematics can be used to trace the two different sulfate reduction processes.

TL;DR: In this article , a suite of analytical techniques, including scanning electron microscopy, energy dispersive X-ray spectroscopy (SEM-EDS) with EDS, electron microprobe analysis (EMPA), and synchrotron-based micro-X-ray fluorescence (μ-XRF) mapping, were utilized in a high-resolution investigation of elemental and secondary-mineral associations with sphalerite grains.

TL;DR: In this paper , the authors use a mass balance model to show that Fe-Mn (oxyhydr)oxide shuttle operating on euxinic continental margins would preferentially bury lighter-mass Mo isotopes to such an extent that early Cambrian seawater can become enriched in heavier Mo isotope at levels comparable to modern seawater.

TL;DR: In this article, the authors combine monitoring of environmental parameters and greenhouse gas fluxes with monthly records of microbial phospholipid fatty acid (PLFAs) δ13C values to probe changes in microbial community and biogeochemistry in response to hydrological changes in a monsoon influenced subtropical wetland from central China.

TL;DR: In this paper , the projected relative abundances of the highly siderophile elements (HSE; Re, Os, Ir, Ru, Pt, and Pd) for bulk parent bodies of 10 magmatic iron meteorite groups/grouplet (IC, IIAB, IIC, IID, IIF, IIIAB, IIIF, IVA, IVB, and South Byron Trio) are broadly similar and show no resolvable differences between noncarbonaceous (NC) and carbonaceous (CC) genetic heritage.

TL;DR: In this paper , the authors combine monitoring of environmental parameters and greenhouse gas fluxes with monthly records of microbial phospholipid fatty acid (PLFAs) δ13C values to probe changes in microbial community and biogeochemistry in response to hydrological changes in a monsoon influenced subtropical wetland from central China.

TL;DR: In this article, the authors analyzed the Au, S, Cu and platinum-group element (PGE) contents of the SCLM-derived lamprophyres that are temporally and spatially associated with the Jiaodong lode Au deposits.

TL;DR: In this article , the authors analyzed the metasomatized sub-continental lithospheric mantle (SCLM) derived lamprophyres that are temporally and spatially associated with the Jiaodong lode Au deposits.

TL;DR: Füger et al. as discussed by the authors showed that both calcite growth rate and pH are parameters that can significantly affect the measured Li isotope fractionation between calcite and fluid, and they suggested that a high variability of δ7Licalcite in natural samples, such as foraminifera, brachiopods, and speleothems can be expected in natural environments.

TL;DR: In this article , the trace element partitioning at the onset of melting is controlled more by pressure (through melt composition) than by the extent of melting, and the authors show that resolvable inter-element fractionations do occur when phlogopite-bearing peridotite are melted, indicating that trace element ratios are not always faithfully representative of that of their sources.

TL;DR: In this paper , the chemical composition of fifty-four clean glass spherules containing neither relict clasts nor crystals from the Chang'e-5 (CE5) regolith was reported.

TL;DR: In this paper, the authors reported new calibration observations of clumped isotopes in four species of calcitic marine bivalves (A. colbecki, N. cochlear, S. cucullata, M. gigas) from various ecosystems including coastal and deep-sea environments, with calcification temperatures ranging from −2 °C to 27 °C and very different amplitudes of seasonal temperature variability.

TL;DR: In this article , the authors measured the 10Be-10B isotope systematics in 29 CAIs from several CV3, CO3, CR2, and CH/CB chondrites and showed that all except for a FUN CAI record a homogeneous initial 10Be/9Be with a single probability density peak at 7.4 × 10−4.

TL;DR: In this paper , the authors conducted high-pressure and high-temperature experiments on ancient and modern sediments (WH black shale and GSS-4 soil) and found that the Hg concentrations decrease while the δ202Hg values increase with rising temperatures.

TL;DR: In this paper , the authors show that the lack of Fe and Mn shuttle effect on Tl and V isotope compositions of organic-rich sediments in the Black Sea is likely due to the shallow (∼100 m) chemocline in the strongly, 2000m deep redox-stratified water column of this basin and very slow deep-water renewal rate.

TL;DR: Li et al. as mentioned in this paper performed comprehensive analysis of haptophyte-specific 18S rRNA sequences and distributions of LCAs, and long-chain alkenoates (LCEs) in surface sediments and suspended particulate matter (SPM) from 37 saline lakes in northern China.