Warming pulse triggered by CO2 released during LIP formation: evaluating 20 kyr event during Cretaceous OAE2

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Cretaceous Cenomanian/Turonian boundary is known as a period of Oceanic Anoxic Event 2 (OAE2). During OAE2, large amount of organic matter deposited over extended sea bottom of the global oceans, and considerable climatic change associated with the disturbance of carbon cycles are under debate. From the Yezo Group in Hokkaido, stratigraphic studies with exclusively high resolution suggested that strong environmental perturbation happened within duration of twenty thousand years. We focused on that event (NSP) and studied biomarkers (organic molecular fossils), especially compound-specific carbon isotope values on biomarkers derived from terrestrial higher plants. Our results showed short term climatic change prevailed just before NSP over terrestrial East Asia during OAE2 interval.