Showing papers in "Chemical Geology in 2022"

TL;DR: In this article , a combined application of both zircon by Hf-O isotopes and apatite by developing geochemical indicators involving Sr-O and volatile (chlorine and sulfur) concentrations was used to better constrain the petrogenesis of porphyries and related ore-forming processes in southern Tibet.

TL;DR: Thermochemical sulfate reduction (TSR) is a set of redox reactions between organic matter and sulfates at temperatures >120 °C, and occurs in varied environments including deeply buried carbonate and clastic rocks, Mississippi Valley- and Sedimentary Exhalative type metal deposits, and early oceans on Earth and likely on Mars as mentioned in this paper .

TL;DR: In this paper , the authors present a database of biological and geological 87Sr/86Sr values (n = 1920) from Italy, using literature data and newly analysed samples, for provenance purposes.

TL;DR: In this paper , the authors investigated the behaviors of humic acid (HA) and phosphate during their coprecipitation with Fe(III) and compared the coprecipient behaviors with those during the adsorption process.

TL;DR: In this article , a suite of systematically collected surface and sub-surface soil samples by X-ray fluorescence and high purity germanium detector based γ-spectroscopy was used to study the distributions and potential dispersions of naturally occurring radioactive materials (NORMs: 226 Ra, 232 Th, and 40 K) from coal-based activities (Barapukuria, Bangladesh).

TL;DR: In this paper, the authors investigated the behaviors of humic acid (HA) and phosphate during their coprecipitation with Fe(III) and compared the coprecipient behaviors with those during the adsorption process.

TL;DR: In this paper, the authors present a database of environmental and geological 87Sr/86Sr values (n = 1920) from Italy, using literature data and newly analysed samples, for provenance purposes.

TL;DR: In this paper , the authors investigated the sediments from two promising rare-earth elements (REE)rich prospective areas: the Tiki Basin in the Southeast Pacific (TKB) and the Central Indian Ocean Basin (CIOB).

TL;DR: In this article , the authors describe the retrieval and regression of the dissolution rates of the primary rock-forming silicates, including quartz and other SiO2 polymorphs, feldspars, pyroxenes, amphiboles, micas, volcanic glass, and olivines.

TL;DR: In this paper , two typical Sb-(Au-W) deposits (Woxi and Banxi) from this region were studied by in-situ geochemical and geochronological analyses of sulfides to establish a general ore formation model for this type of deposit.

TL;DR: In this paper , the U-Pb, Sm-Nd, and Sr isotopic and elemental compositions of a suite of prospective apatite RMs using isotope dilution (ID) TIMS and laser ablation (LA) ICP-MS were determined.

TL;DR: The relationship between fluid activity and anatexis in the Himalaya is ambiguous in regard to whether it is dominated by fluid-saturated melting triggered by lesser Himalayan sequence (LHS) fluids or dehydration melting of Greater Himalayan Sequence (GHS) metasedimentary rocks as discussed by the authors .

TL;DR: In this paper , the capacity of metastable iron sulfide (FeS) to sequester organic carbon (OC) extracted from marine sediments and unravel the fate of ferrihydrite-bound OC complexes (Fh-OCs) when exposed to dissolved sulfide.

TL;DR: In this paper , a simplified 1-D reactive transport model was constructed based on the properties obtained from Eagle Ford and Mancos shales, which showed that carbonate and clay minerals dissolved during the CO2/brine/shale interaction, which could provide the potential for mineral trapping as an effective sealing mechanism in the middle phases of the storage lifetime in shales.

TL;DR: Authigenic carbonate (AC) forms in siliciclastic marine sediments in part as a result of the degradation of organic matter and methane, and the relative importance of these reactions in contributing to carbonate authigenesis are poorly understood, especially from a global perspective as discussed by the authors .

TL;DR: PyGeochemCalc as mentioned in this paper is a community-driven, open-source Python package that provides a consolidated set of functions for calculating the thermodynamic properties of gas, aqueous, and mineral species, as well as reactions amongst these species, over a broad range of temperature and pressure conditions.

TL;DR: In this article , a series of sequential extractions of modern sediments from the Peruvian margin was conducted to investigate U in different host fractions of the sediment (reactive, silicate, and HNO 3 -soluble fraction).

TL;DR: In this article, the authors measured carbon isotope composition in bulk samples and extracted biomarkers for 4-8 horizons of 15 soil profiles to understand variability in organic carbon (SOC) age and persistence across incremental differences in mean annual precipitation.

TL;DR: In this article , the authors measured carbon isotope composition in bulk samples and extracted biomarkers for 4-8 horizons of 15 soil profiles to understand variability in organic carbon (SOC) age and persistence across incremental differences in mean annual precipitation.

TL;DR: Based on the observation of typical orogenic gold deposits and thermodynamic simulation of fluid-rock reaction, the general features of proposed patterns include: (1) Orogenic ore fluids are capable of transporting sufficient gold from deep (5kbar and 600°C) to shallow (1 kbar and 200°C), resulting in alteration and mineralization occurred in a much varied depth as discussed by the authors .

TL;DR: In this paper , a combined study of in-situ monazite U-Th-Pb ages, allanite SmNd isotope compositions, and whole-rock Sm Nd isotopes was carried out for Higher Himalayan metamorphic rocks and leucogranites in the Himalayan orogen.

TL;DR: In this article , the ID-TIMS results of Pit-AB, Rond-A, RG-114, BB#7 and 19GX cassiterite were reported for the first time.

TL;DR: In this article , the Nu Sapphire multi-collector inductively-coupled-plasma mass-spectrometer (MC-ICP-MS) was used to obtain high-precision Ca isotope data, including the stable isotopes 42Ca, 43Ca and 44Ca, as well as the radiogenic 40Ca using a standard bracketing technique.

TL;DR: In this paper , the authors propose a metasomatic in origin hypothesis for carbonatite-phoscorite-ultramafic rock complexes, in which a carbonatitic magma, generated by partial melting of carbonated mantle, acts as the agent of metasomatism.

TL;DR: In this article , the authors investigated the tetraether distribution in 108 surface sediment samples from 83 lakes and 22 surrounding soils on the Tibetan Plateau to explore their distribution, sources, and environmental controlling factors.

TL;DR: In this paper, the authors review the noble gas (He-Ne-Ar-Xe) isotope systematics of major ocean island basalts (OIB) suites.

TL;DR: In this article , the authors used a Bayesian model to test the hypothesis that the observed fluids are generated in-situ, driven by radioelement decay and subsequent microbial methanogenesis, and controlled by porosity of the host rock.

TL;DR: In this paper , the trace chemistry of micas is inherited from their source, whether hydrothermal or igneous, thus providing a signature for their origin, which can be used to identify different origins for a same mica species in the same sample (e.g., superposed alterations).

TL;DR: In this article , the authors explored the possibility that zircon-saturated volumes may form locally at the growing mineral-melt interfaces if the growth rate of a low KdZr mineral (< 0.2) is much faster than the diffusion rate of the rejected Zr4+ away into the melt, thus leading to the precipitation of Zircon in low-Zr mafic magmas.

TL;DR: Li et al. as discussed by the authors investigated the potential of microbial branched tetraether lipids (i.e., brGDGTs) in terrestrial pH reconstructions from the Yangtze River Estuary (YRE) to the shelf region in the East China Sea (ECS).