Radioisotopic chronology of Ocean Anoxic Event 1a: Framework for analysis of driving mechanisms

The timing, tempo, and causative mechanisms of Ocean Anoxic Event 1a (OAE1a), one of several such abrupt perturbations of the Mesozoic global carbon cycle, remain uncertain. Mudstones interbedded with tuffs in Hokkaido, Japan preserve carbon and osmium isotope shifts recording OAE1a. U-Pb zircon ages of tuffs constrain the OAE1a onset to 119.55 +0.072/-0.079 million years ago (Ma) and its duration to 1116 +87/-93 thousand years (kyr). Isotopic excursions of osmium followed by carbon that mark the rapid onset of OAE1a each lasted ~115 kyr. Critically, the occurrence of index fossil <i>Leupoldina cabri</i> in the Hokkaido OAE1a section, which also caps and thus postdate Ontong Java Plateau (OJP) basalts, has a U-Pb zircon age of ~118.7 to 118.4 Ma. Therefore, OJP volcanism remains a probable source of unradiogenic osmium and light carbon and a causative mechanism of OAE1a.

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Publication Details

Journal
Science Advances
Published
2024-11-20
DOI
https://doi.org/10.1126/sciadv.adn8365
Citations
11
Primary Topic
Geological and Geochemical Analysis
Type
article
Field-Weighted Citation Impact
5.88

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Radioisotopic chronology of Ocean Anoxic Event 1a: Framework for analysis of driving mechanisms

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article

Radioisotopic chronology of Ocean Anoxic Event 1a: Framework for analysis of driving mechanisms

Luca Podrecca, Bradley B. Sageman, Toshiro Yamanaka, Youjuan Li, Brad S. Singer, Reishi Takashima, Katarina Savatic, Michael T. Mohr, David Selby, Mark D. Schmitz, T. Tomaru, Keiichi Hayashi
article en
11 citations

Abstract

The timing, tempo, and causative mechanisms of Ocean Anoxic Event 1a (OAE1a), one of several such abrupt perturbations of the Mesozoic global carbon cycle, remain uncertain. Mudstones interbedded with tuffs in Hokkaido, Japan preserve carbon and osmium isotope shifts recording OAE1a. U-Pb zircon ages of tuffs constrain the OAE1a onset to 119.55 +0.072/-0.079 million years ago (Ma) and its duration to 1116 +87/-93 thousand years (kyr). Isotopic excursions of osmium followed by carbon that mark the rapid onset of OAE1a each lasted ~115 kyr. Critically, the occurrence of index fossil <i>Leupoldina cabri</i> in the Hokkaido OAE1a section, which also caps and thus postdate Ontong Java Plateau (OJP) basalts, has a U-Pb zircon age of ~118.7 to 118.4 Ma. Therefore, OJP volcanism remains a probable source of unradiogenic osmium and light carbon and a causative mechanism of OAE1a.

Science AdvancesVol. 10(47)
Northwestern University (US), Boise State University (US), University of Wisconsin–Madison (US), Durham University (GB), Tohoku University (JP), Hokkaido Research Organization (JP), Geological Survey of Japan (JP), Tokyo University of Marine Science and Technology (JP)
Sight Research UK, Natural Environment Research Council
Life below water
Openalex Percentile: Top 3%
Geological and Geochemical Analysis
5.88
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