Dynamics of the Neoproterozoic carbon cycle

Daniel H. Rothman*, John M. Hayes, Roger E. Summons

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    370 Citations (Scopus)

    Abstract

    The existence of unusually large fluctuations in the Neoproterozoic (1,000-543 million years ago) carbon-isotopic record implies strong perturbations to the Earth's carbon cycle. To analyze these fluctuations, we examine records of both the isotopic content of carbonate carbon and the fractionation between carbonate and marine organic carbon. Together, these are inconsistent with conventional, steady-state models of the carbon cycle. The records can be well understood, however, as deriving from the nonsteady dynamics of two reactive pools of carbon. The lack of a steady state is traced to an unusually large oceanic reservoir of organic carbon. We suggest that the most significant of the Neoproterozoic negative carbon-isotopic excursions resulted from increased remineralization of this reservoir. The terminal event, at the Proterozoic-Cambrian boundary, signals the final diminution of the reservoir, a process that was likely initiated by evolutionary innovations that increased export of organic matter to the deep sea.

    Original languageEnglish
    Pages (from-to)8124-8129
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume100
    Issue number14
    DOIs
    Publication statusPublished - 8 Jul 2003

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