Youjuan Li on Muck Rack

Youjuan Li

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Articles

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

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By Gil Weinberg, Jessica L. McCord, Brad Singer, Youjuan Li
| Science Magazine Verified
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).
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