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Black shale Mo isotope record reveals dynamic ocean redox during the Mesoproterozoic Era

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2021; 18 ()

Eukaryotes reached ecological importance in the late Neoproterozoic Era, some one billion years after their emergence. Their slow rise to prominence h......

Rise of major subaerial landmasses about 3.0 to 2.7 billion years ago

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2021; 18 ()

The emergence of subaerial landmasses should have inevitably modulated the chemical composition of the atmosphere-ocean and long term climate. However......

The composition and weathering of the continents over geologic time

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2021; 17 ()

The composition of continental crust records the balance between construction by tectonics and destruction by physical and chemical erosion. Quantitat......

Ca isotope systematics of carbonatites: Insights into carbonatite source and evolution

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2021; 17 ()

Carbonatite, an unusual carbonate-rich igneous rock, is known to be sourced from the mantle which provides insights into mantle-to-crust carbon transf......

Morphology dominated rapid oxidation of framboidal pyrite

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2021; 16 ()

The rapid oxidation of framboidal pyrite is conventionally attributed to its fine grain size. However, the effect of the crystal facets of the microcr......

Noble gas incorporation into silicate glasses: implications for planetary volatile storage

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2021; 17 ()

Incorporation of smallmolecules in silicatemeltsmay provide an importantmechanism for storing noble gases in the deep Earth, yet the means by which ch......

Carbon and hydrogen isotope fractionation in lipid biosynthesis by Sporosarcina sp. DSK25

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 14 ()

Pressure dependent fractionation (PDF) of carbon and hydrogen isotopes in lipid biosynthesis by gram-negative piezophilic bacteria has been reported t......

Past endolithic life in metamorphic ocean crust

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 14 ()

The known deep subsurface biosphere on Earth persists in diversified habitats, including deep within igneous rocks of the oceanic crust. Here, we exte......

Lanthanum anomalies as fingerprints of methanotrophy

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 14 ()

Methane is an important greenhouse gas whose emissions into the oceans and atmosphere are regulated by relatively unconstrained anaerobic and aerobic ......

Termination of Cryogenian ironstone deposition by deep ocean euxinia

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 15 ()

Widespread deposition of iron-rich sedimentary rocks (ironstones) occurred during the Sturtian ice age, the earlier of two Cryogenian 'Snowball Earth'......

Triple oxygen isotopes of meteoric hydrothermal systems - implications for palaeoaltimetry

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 15 ()

We use triple oxygen isotopes of altered granitic rocks to determine the isotope composition of meteoric waters in a fossil hydrothennal system, the l......

Wehrlites from continental mantle monitor the passage and degassing of carbonated melts

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 15 ()

Continental rifting has been linked to the thinning and destruction of cratonic lithosphere and to the release of enough CO2 to impact the global clim......

Experimental evidence for light Ba isotopes favouring aqueous fluids over silicate melts

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 16 ()

Barium (Ba) is a fluid mobile element and enriched in the Earth's crust, which has potential implications for constraining fluid activities during mag......

Unravelling the controls on the molybdenum isotope ratios of river waters

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 13 ()

The molybdenum (Mo) isotope ratios (delta Mo-98/95) of river waters control the (delta Mo-98/95) values of seawater and impact on the use of Mo isotop......

Forty-year pollution history of microplastics in the largest marginal sea of the western Pacific

期刊: GEOCHEMICAL PERSPECTIVES LETTERS, 2020; 13 ()

Marine sediments have been considered to be a major sink for microplastics, yet the pollution history of microplastics recorded in these sediments rem......

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