Showing papers in "Chemical Geology in 2023"

TL;DR: In this paper , the authors identified a subtype of hydrogenetic ferromanganese nodules exhibiting lower Co (<0.4 wt%) and Ti contents, higher Pb and REY contents, and higher Fe/Co and Fe/Mn ratios than typical hydrogenetic nodules.

TL;DR: In this paper , the same authors analyzed surface sediments along an elevation transect of a seamount with water depths from 733 m to 3097 m in the South China Sea (SCS) and found that sedimentary brGDGTs are derived mainly from the water column, and most likely at intermediate water depth of about 300-700 m.

TL;DR: In this article , a series of experiments under marine-relevant conditions and interpreted the results using a multi-phase time-dependent numerical reactor model were conducted to constrain the rate and isotopic effect associated with ion exchange in sedimentary barite (BaSO4, barium sulfate).

TL;DR: In this article , the seasonal riverine MgSr isotope pattern in the middle Yellow River was systematically investigated based upon weekly collected samples for the whole year of 2013, and the results demonstrated that Mg is mainly transported in the dissolved form (65%) in this river system and that 45% of the total dissolved Mg was transported during the monsoon seasons, with 2% exported over 4 days during a single storm event.

TL;DR: In this paper , the major geochemical processes controlling the release, geochemical speciation, and Cr redistribution during anoxic-oxic alternation were investigated in three basalt-derived paddy soils containing 114, 268, and 429 mg/kg of Cr.

TL;DR: In this paper , a suite of quartz monzonite, porphyritic granite, and miarolitic alkali feldspar granites from the coastal area of Fujian, southeastern China were evaluated to evaluate the genetic link between these rocks.

TL;DR: In this article , the authors analyzed stable isotope compositions of 27 basalts from geochemically and geologically diverse mid-ocean ridge segments, to constrain the Sn isotope composition of the depleted mantle source.

TL;DR: In this article , a combination of U-isotope and elemental concentration datasets for the Furlo sedimentary section in Marche-Umbria, Italy was used to examine black shales deposited before and during Oceanic Anoxic Event 2 (OAE 2), which was one of the most extreme climatic perturbations of the Mesozoic Era that took place around the Cenomanian-Turonian boundary (Late Cretaceous, c. 94 Ma).

TL;DR: In this article , the first evidence of reactive phosphorus (P) in a fulgurite which has been experimentally generated under controlled conditions from natural apatite was presented, which supported the speculation that frequent lightning activity under early Earth conditions may have provided more than 10.000 kg/yr of reactive P on early Earth through the generation of reactive p-bearing fulgurites.

TL;DR: In this article , a detailed study of the Leigongshan (LGS) tonalite pluton in the eastern section of the North Qilian suture zone (NQSZ) is presented.

TL;DR: In this article , the authors focus on the low-temperature mineralogical response of xenotime, a phosphate mineral routinely used as a geochronometer, to fluid-assisted alteration.

TL;DR: In this paper , the trace element abundances in zircon along with low Ti-in-zircon temperatures reveal that the GPC microgranite porphyry magma was more evolved than GPC granite and granodiorite.

TL;DR: In this paper , the authors investigated Nitrogen partitioning between its main hosts using partly devolatilized natural quartz-muscovite-chlorite schist (mica schist), with NH4+-rich muscovites, under conditions corresponding to hot subduction: 3.0-7.8 GPa, 750-1090 °C, and oxygen fugacity (fO2) about the NNO buffer.

TL;DR: In this paper , the glassy pools in highly crystallized basaltic-andesite and trachybasalt samples obtained from isothermal crystallization experiment at different shear rates were collected at room temperature.

TL;DR: In this article , the authors explore how different etching sequences, track selection approaches, and analytical methods influence track length and density measurements, and propose a two-step etching procedure that may provide more plentiful and reproducible data by reducing the impact of human decision-making.

TL;DR: In this paper , the steady state release rates of major elements from a suite of altered basalts have been measured at pH 3, 120 °C, and far from equilibrium conditions, and the results indicate that altered basalt formations can provide sufficient divalent cations for subsurface carbon mineralization.

TL;DR: In this paper , the authors reported the first radiogenic isotope data (Sr, Nd, Pb and Hf) for lavas of Lord Howe Island (LHI) in the Tasman Sea, the most prominent subaerial expression of the hypothesised Lord Howe mantle plume.

TL;DR: In this paper , a combination of Simultaneous Thermal Analysis (STA), which involves Differential Scanning Calorimetry (DSC), Thermal Gravimetry Analysis (TGA), and Evolved Gas Analysis conducted by Mass Spectrometry (EGA-MS), enable a reconstruction of the volatile distributions and compositions (H2O, CO2, and SO2) of these samples.

TL;DR: In this article , the authors examined the plio-pleistocene evaporitic lacustrine succession in the Qaidam Basin, which was recovered by drill core SG-1, providing the material for understanding the maturation of dolomite.

TL;DR: In situ U-Pb dating of carbonate minerals and Rb-Sr dating of illite was carried out on the Yata sediment-hosted disseminated-type gold deposit in the Youjiang basin, South China as discussed by the authors .

TL;DR: In this article , the authors conducted a geochemical and isotopic study of representative fresh samples from Koidu and Tonguma in the Man Craton in West Africa, and found that the bulk samples from both localities have strong enrichment in K2O (up to 4.4 wt%), but also CaO and CO2 ( up to 24 wt% and 18 wt%, respectively), which is consistent with the micaceous nature of these rocks and their variable abundance of calcite.

TL;DR: In this article , the melt viscosity of anhydrous and hydrous peridotite was investigated using a multipronged approach combining micropenetration viscometry, conventional DSC, flash DSC and Brillouin spectroscopy.

TL;DR: Li et al. as discussed by the authors investigated the control on the sedimentary GDGT distribution in lakes, and found that the main biological source of archaeal GDGTs in surface sediments is aquatic Group I.1a Thaumarchaeota (Nitrosoarchaeum).

TL;DR: The Gross Brukkaros natural laboratory in central Namibia was chosen to study the interface between fine-grained dolomite-carbonatite dykes and associated diatremes as discussed by the authors .

TL;DR: In this article , a combined approach using major, trace element, and C-O isotope compositions obtained in individual stromatolitic carbonate laminae was used to study the evolution of microbial habitats under extreme environmental changes during the Badenian Salinity Crisis.

TL;DR: In this article , the authors used δ26Mg, δ13C, and δ18O isotopes to characterize the different crystal morphologies exhibited by Ordovician dolomites from the Tarim Basin, China.

TL;DR: In this article , physicochemical characterization of the aerosols contained in steam and H2S-rich plumes discharged from La Soufrière volcano, in conjunction with the first report on their heavy metal degassing emission rates were presented.

TL;DR: This paper used Re-Os isotope analysis on solid bitumens from Lower Cambrian Longwangmiao and topmost Ediacaran Dengying formations in Anyue gas-field, Central Sichuan basin to date the main gas accumulation.

TL;DR: This paper examined the extent and conditions of alteration at different pseudo-stratigraphic levels in the ancient forearc oceanic crust that was obducted during the Middle Ordovician.