Showing papers in "Chemical Geology in 2021"

TL;DR: In this article, the authors showed that the results drawn from the Sr/Ba ratio are often inconsistent with those drawn from other sedimentary environment indicators during practical application; therefore, the usability of this indicator is not widely acknowledged.

TL;DR: In this paper, the authors examined the unweathered carbonate and clastic bedrocks, as well as surface soils in a typical karst area in Guangxi of China.

TL;DR: In this article, the authors synthesize published meteoric (derived from precipitation) water triple oxygen isotope data with a new, near-global surface water dataset of δ′18O, δ−17O, Δ−2H, deuterium-excess, and ∆′17O.

TL;DR: In this paper, the authors presented a set of high-precision K isotopic data acquired on terrestrial rocks, seawater, as well as a lunar meteorite using the recently released Nu Sapphire™ MC-ICP-MS that utilizes a collision cell to minimize Ar-based interferences while maintaining remarkably high K sensitivity.

TL;DR: In this paper, the authors used LA-ICP-MS/MS (laser ablation tandem inductively coupled mass spectrometry) and NH3 gas to separate Hf from Lu, Yb, and Hf react with NH3 to form a variety of product ions.

TL;DR: In this article, the authors investigated the GDGT distributions across a large bottom water dissolved oxygen (DO) gradient (0.10-7.20 µm/L) using surface sediments of Lake Yangzonghai, a warm monomictic lake in southwestern China.

TL;DR: Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) mapping is a rapidly expanding field in the geosciences because of the wealth of spatial information it provides on the petrogenesis of igneous, metamorphic and sedimentary rocks and ore mineral formation.

TL;DR: In this article, Li and K isotope fractionation during silicate dissolution in ultra-acidic (unidirectional) and near-natural (biologically affected) environments is investigated.

TL;DR: In this paper, the authors provide an extensive and up-to-date compilation of published terrestrial and marine sedimentary Nd isotopic measurements, and construct high resolution, gridded, global maps that characterise the Nd-isotopic signature of the continental margins and seafloor sediment.

TL;DR: In this article, a multi-scale model for isotope fractionation in tight sedimentary rocks is presented, in which seepage in fractures, diffusion and adsorption/desorption in matrix pores, and concentration diffusion in kerogen structural pores are coupled.

TL;DR: For example, the authors in this article used oceanic basalts as indirect tracers of Earth's mantle composition, and found that their incompatible element and isotopic composition is inherently biased towards the incompatible element enriched source components.

TL;DR: In this article, the authors calculated reduced partition function ratios (103lnβ) of Cd isotopes in various organic Cd complexes by density functional theory and showed that the 103lnβ of 114Cd/110Cd for these complexes decreased in the order of cd(Hcit)(H2cit)− > Cd(cys)2(H2O)3− >CdH(cit)4− > cdH 2O)4 ǫ> cd

TL;DR: In this article, a large fraction of this net riverine dissolved Ba flux to the ocean is derived from estuarine processes, in particular the release of exchangeable Ba from riverine suspended particles due to exchange with major cations in seawater.

TL;DR: Hauri et al. as mentioned in this paper proposed a set of guidelines for collecting and reporting melt inclusion data, which are intended to ensure certain quality criteria are met and to achieve consistency among published data sets in order to maximize their utility.

TL;DR: Li et al. as mentioned in this paper performed in situ laser-ablation ICP-MS U Pb dating and trace element characterization of calcites collected from borehole cores within one of the main fault zones in the Central Uplift of the Tarim Basin.

TL;DR: In this paper, high concentrations of hydrogen (H2) and methane (CH4) have been detected in shallow open-hole exploration wells surrounding the Neoarchean Frog's Leg gold camp in the Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia.

TL;DR: The Kapamba lamproite has been shown to represent melting products of similar K-metasomatized cratonic mantle domains, but their formation occurred under contrasting volatile conditions at different stages during rift development (i.e., incipient versus slightly more advanced rifting).

TL;DR: In this paper, the authors present the first compiled global isotopic dataset for these types of fluids, integrating a large amount of unpublished data with the previously published literature in order to investigate these fracture fluid systems on a global scale.

TL;DR: In this article, the Nu Instruments Sapphire double-focusing multi-collector ICPMS with a hexapole collision/reaction gas cell is used to measure 41K/39K ratios.

TL;DR: Apatite geochemical and isotope analyses have been used to identify the source and evolution of granitoid petrogenesis in Early Cretaceous (ca. 130 Ma) granite from northeastern China.

TL;DR: In this article, the effects of Ca on the thermal stability of organo-mineral associations in a synthetic mineral mixture of kaolinite, goethite, and aluminum (Al)-oxides mimicking the mineralogy of the clay-size fraction of weathered tropical soils were evaluated.

TL;DR: In this article, the authors performed experiments on basaltic samples at fluid saturation in the C-H-O-N system, using an Internally Heated Pressure Vessel (IHPV) and Piston Cylinder (PC) in the pressure range 0.8-kbar to 10kbar, and a wide range of fO2 conditions from IW+4.9 to IW-4.7 (IW standing for the Iron-Wustite redox buffer).

TL;DR: In contrast, tooth enamel organic matter is protected from diagenetic alteration by the mineral structure of hydroxyapatite and thus is often preserved over geological time.

TL;DR: In this paper, the late Cretaceous blueschist-facies (480°C-1.8°GPa) segment of the Zagros suture zone, a well-preserved block-in-matrix paleo-subduction channel, was investigated and the relative chronology, conditions of deformation and potential fluid sources and processes associated with the widespread occurrence of lawsonite + clinopyroxene + glaucophane veins and aragonite-bearing hydraulic breccias were determined.

TL;DR: Li et al. as discussed by the authors analyzed a series of Cambrian oolites and microbialites with minor terrigenous admixtures in the Hannan-Micangshan area, South China using various fractions (bulk rock, acid soluble and insoluble, individual siliciclastic and heavy minerals), and solution-and laser ablation (LA)-based analytical techniques.

TL;DR: In this paper, the authors provided the first continuous seawater Ca isotope profile from conodont apatite in South China for the latest Permian to early Middle Triassic, revealing major fluctuations in the Early Triassic calcium cycle.

TL;DR: In this article, the authors investigated the interplaying controls on the generation and composition of river sediments across South China and found that dominantly sedimentary and basaltic rocks of the Yangtze block shed quartzo-lithic sedimentaclastic sand, whereas mostly granitic and sedimentary rocks generated feldspatho-quartzose sand.

TL;DR: In this article, Cd-spiked paddy soil was incubated under anaerobic condition for 40 days and then aerobic condition for 15 days, and the transformation of Cd speciation and the redox cycling of Fe/N/S was investigated.

TL;DR: In this article, Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) was employed to explore the seasonal transformation and distribution of dissolved organic matter (DOM) including organic P (DOP), from spring 2017 to winter 2018 along with high-frequency geochemical monitoring.

TL;DR: In this article, the adsorption isotherms, edges and spectroscopic characteristics of antimonite (Sb(III) and Sb(V) on two tunnel-structured Mn oxides, pyrolusite (β-MnO2) and manganite (γ -MnOOH), were investigated and compared using batch kinetic techniques.