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Graphitic inclusions in zircon from early Phanerozoic S-type granite: Implications for the preservation of Hadean biosignatures

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 349 ()

A biotic origin of isotopically light graphite in Hadean zircon remains contested, in part because it is unclear how biogenic carbon in sediments beha......

Tungsten in the mantle constrained by continental lithospheric peridotites: Less incompatible and more abundant

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 351 ()

Isotope dilution W whole-rock data, coupled with data for other trace elements in 42 peridotite xenoliths from Tariat (Mongolia), Yangyuan and Hannuob......

Temperature and co-crystallization effects on Zr isotopes

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 352 ()

We undertook Zr isotope measurements on zircon, titanite, biotite, amphibole, and whole rocks from the La Posta pluton (Peninsular Ranges, southern Ca......

Uranium and molybdenum isotope evidence for globally extensive marine euxinia on continental margins and in epicontinental seas during the Devonian-Carboniferous Hangenberg Crisis

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 352 ()

The end-Devonian Hangenberg Crisis was one of the biggest Phanerozoic mass extinctions. However, the mechanism(s) that triggered this event is still d......

Isotopic constraints on nitrate sources and cycling in Antarctic soils

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 361 ()

While nitrate (NO3-) serves as a vital nutrient for soil organisms, the lack of knowledge on its sources and cycling in Antarctic soils does not allow......

Continental evaporites as brine sources for formation of SEDEX and MVT deposits: Implications from boron isotope compositions of tourmaline

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 361 ()

In this study, the boron isotopic composition of Paleoproterozoic seawater is reconstructed using 811B of tourmaline from the Paleoproterozoic Pb-Zn d......

GDGT distribution in tropical soils and its potential as a terrestrial paleothermometer revealed by Bayesian deep-learning models

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 362 ()

Branched and isoprenoidal glycerol dialkyl glycerol tetraethers (br- and isoGDGTs) are membrane lipids produced by bacteria and archaea, respectively.......

Distinct dynamics of plant- and microbial-derived soil organic matter in relation to varying climate and soil properties in temperate agroecosystems

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 361 ()

Global environmental change can substantively alter soil carbon storage and dynamics in agroecosystems. However, investigations of soil organic matter......

Coupled reduction of structural Fe(III) in nontronite and oxidation of petroleum hydrocarbons

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 344 ()

Fe-bearing clay minerals are frequently present in oil reservoirs as potential electron acceptor. Compounds in crude oil may mediate microbial reducti......

Apatite and fluorite control the transport of tungsten in calcium-bearing hydrothermal fluids

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 346 ()

Minerals associated with ores (gangue minerals) record the physicochemical conditions of ore-forming fluids. Whether and/or how they affect the solubi......

Redox heterogeneity of the Ediacaran ocean constrained by chromium isotopes

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 344 ()

Ocean oxygenation during the Ediacaran Period (635-541 Ma) is thought to be a potential stimulus for the emergence and diversification of early animal......

Halogen enrichment in the North American lithospheric mantle from the dehydration of the Farallon plate

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 348 ()

A greater quantity of halogens (F, Cl, Br, and I) appear to be subducted globally than are erupted at magmatic arcs, requiring either an increase in t......

Lead-lead (Pb-Pb) dating of eucrites and mesosiderites: Implications for the formation and evolution of Vesta

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 348 ()

Asteroid 4 Vesta is the largest known differentiated body in the asteroid belt, and is thought to be the likely parent body of howardite, eucrite, and......

Temporal evolution of shallow marine diagenetic environments: Insights from carbonate concretions

期刊: GEOCHIMICA ET COSMOCHIMICA ACTA, 2023; 351 ()

Early diagenesis of marine organic matter dramatically impacts Earth's surface chemistry by changing the burial potential of carbon and promoting the ......

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