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An Improved Geochemical Model of Atmospheric CO2Fluctuations Over the Past 100 Million Years

Lasaga, Antonio C., Berner, Robert A., Garrels, Robert M.·2013·Geophysical Monograph Series

Abstract

The carbonate-silicate geochemical cycle of Berner, Lasaga and Garrels [Berner et al., 1983] is extended to include reactions involving organic carbon and sulfur. To study the effect of the extended cycle on atmospheric CO2, new reservoirs are added for organic carbon, pyrite, gypsum, and atmospheric oxygen. The present-day cycle is constructed taking into account oxidation of pyrite, diagenetic pyrite formation, sulfate reduction at mid-ocean ridges, organic carbon weathering and organic carbon burial, in addition to the fluxes included by Berner et al. [1983]. The organic carbon and reduced sulfur fluxes over the last 100 million years are obtained from a generalized isotope model and data on δ13C and δ34S. The augmented model modifies the results of BLAG, Berner et al. [1983], while retaining the basic conclusions, specifically the link between CO2, paleoclimate, and tectonism.

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Metadata

Authors
Lasaga, A. C., Berner, R. A., & Garrels, R. M.
Venue
Geophysical Monograph Series
Published
2013-03-18
Pages
397-411
ISSN
  • 0065-8448 (ISSN-L)
  • 2328-8779
OpenAlex
W1500078408
Cited by
184
References
3
FWCI
14.26
Type
book chapter
Language
en
Open access
closed

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CoChat. (2026). Citation check: An Improved Geochemical Model of Atmospheric CO2Fluctuations Over the Past 100 Million Years. https://app.cochat.ai/papers/10.1029/gm032p0397
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Lasaga, A. C., Berner, R. A., & Garrels, R. M. (2013). An Improved Geochemical Model of Atmospheric CO2Fluctuations Over the Past 100 Million Years. Geophysical Monograph Series. https://doi.org/10.1029/gm032p0397

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