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- W3052378613 abstract "Significance On geologic timescales, Earth’s habitable climate is maintained by a negative feedback process wherein atmospheric <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll><mml:msub><mml:mrow><mml:mi mathvariant=normal>C</mml:mi><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> is consumed by reaction with silicate rocks during erosion and weathering. However, relative to modern continental crust, many models propose an ancient crust that was thinner, denser, and significantly lower in silica for the first 1 to 2 billion years of Earth history. Like modern oceanic crust, such mafic crust would likely be poorly exposed to the atmosphere, resulting in a less climatically stable early Earth. We find that two geologic processes (mantle cooling and atmospheric oxidation) significantly compromise some previous methods for estimating ancient crustal composition. Accounting for these factors results in estimates much closer to the composition of modern continental crust." @default.
- W3052378613 created "2020-08-24" @default.
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- W3052378613 date "2020-08-17" @default.
- W3052378613 modified "2023-10-16" @default.
- W3052378613 title "Constraining crustal silica on ancient Earth" @default.
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- W3052378613 doi "https://doi.org/10.1073/pnas.2009431117" @default.
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