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Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts

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  • Masayuki Ikeda

    (Graduate School of Science, Shizuoka University
    Lamont Doherty Earth Observatory, Columbia University,)

  • Ryuji Tada

    (Graduate School of Science, University of Tokyo)

  • Kazumi Ozaki

    (School of Earth and Atmospheric Sciences, Georgia Institute of Technology
    NASA Postdoctoral Program, Universities Space Research Association)

Abstract

The global silica cycle is an important component of the long-term climate system, yet its controlling factors are largely uncertain due to poorly constrained proxy records. Here we present a ∼70 Myr-long record of early Mesozoic biogenic silica (BSi) flux from radiolarian chert in Japan. Average low-mid-latitude BSi burial flux in the superocean Panthalassa is ∼90% of that of the modern global ocean and relative amplitude varied by ∼20–50% over the 100 kyr to 30 Myr orbital cycles during the early Mesozoic. We hypothesize that BSi in chert was a major sink for oceanic dissolved silica (DSi), with fluctuations proportional to DSi input from chemical weathering on timescales longer than the residence time of DSi (

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  • Masayuki Ikeda & Ryuji Tada & Kazumi Ozaki, 2017. "Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts," Nature Communications, Nature, vol. 8(1), pages 1-9, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15532
    DOI: 10.1038/ncomms15532
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    Cited by:

    1. Jun Shen & Runsheng Yin & Thomas J. Algeo & Henrik H. Svensen & Shane D. Schoepfer, 2022. "Mercury evidence for combustion of organic-rich sediments during the end-Triassic crisis," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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