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

Masayuki Ikeda (), Ryuji Tada and Kazumi Ozaki
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Masayuki Ikeda: Graduate School of Science, Shizuoka University
Ryuji Tada: Graduate School of Science, University of Tokyo
Kazumi Ozaki: School of Earth and Atmospheric Sciences, Georgia Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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 (

Date: 2017
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DOI: 10.1038/ncomms15532

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