Detrital carbonate minerals in Earth's element cycles

Müller, Gernot Michael; Börker, Janine; Sluijs, Appy; Middelburg, Jack J.

doi:10.1002/essoar.10508409.2

2022

DOI: 10.1002/essoar.10508409.2

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Detrital carbonate minerals in Earth's element cycles

Gernot Michael Müller

Janine Börker

Appy Sluijs

et al.

Abstract: Erosion and weathering of Earth's surface not only shape landscapes but also influence the global carbon cycle, thereby maintaining the habitability of our planet (

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2024

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References 121 publications

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Closing the geologic carbon cycle

Derry

2024

Proc. Natl. Acad. Sci. U.S.A.

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Estimates of sedimentary organic carbon burial fluxes based on inventory and isotope mass balance methods have been divergent. A new calculation of the isotope mass balance using a revised assessment of the inputs to the ocean-atmosphere system resolves the apparent discrepancy. Inputs include weathering of carbonate and old kerogen, geogenic methane oxidation, and volcanic and metamorphic degassing. Volcanic and metamorphic degassing comprise ≈23% of the total C input. Inputs from isotopically light OCpetro and CH 4-geo drive the mean δ 13 C of the input to =−8.0 ± 1.9‰, notably lower than the commonly assumed volcanic degassing value. The isotope mass balance model yields a modern burial flux =15.9 ± 6.6 Tmol y −1 . The impact of the mid-Miocene Climatic Optimum isotope anomaly is an integrated excess deposition ≈ 4.3 × 10 6 Tmol between 18 and 11 Ma, which is both longer and larger than estimates for the total degassing by the Columbia River Basalt eruptions, implying a complex carbon system response to large eruptive events. Monte Carlo evaluation finds that late Cenozoic net growth of the carbonate reservoir is very likely while net growth of the C org reservoir is less certain but more likely than not. At present, subduction does not appear to keep up with net sedimentation and the overall masses of sedimentary carbonate and organic carbon are likely increasing. Growth in the sedimentary C org reservoir implies oxidation of the surface environment and likely increases in atmospheric pO 2 .

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Closing the geologic carbon cycle

Derry

2024

Proc. Natl. Acad. Sci. U.S.A.

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Detrital carbonate minerals in Earth's element cycles

Abstract: Erosion and weathering of Earth's surface not only shape landscapes but also influence the global carbon cycle, thereby maintaining the habitability of our planet (

Cited by 1 publication

References 121 publications

Closing the geologic carbon cycle

Closing the geologic carbon cycle

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