Abstracts of Annual Meeting of the Geochemical Society of Japan
53th Annual Meeting of the Geochemical Society of Japan
Session ID : 1B13
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Early Cretaceous seawater Os isotope composition: an indicator of a LIP-OAE link?
M. L. G. Tejada, Katsuhiko Suzuki, Tatsuhiko Sakamoto, R. Coccioni, Junichiro Kuroda, Yoshiyuki Tatsumi, John Mahoney
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Keywords: Ontong Java Plateau, Re-Os isotopes, oceanic plateau
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Abstract
We will be presenting our Os isotope data obtained for the organic-rich sediments including the Selli Level (OAE1) from the Umbria-Marche region in Central Italy, representing an almost complete sequence covering the period before, during, and after the main pulse of Ontong Java Plateau volcanism. Our initial results suggest a lowering of seawater Os isotope composition from a "background" value of ~0.67 around chron M0r (125-124.61 Ma), suggesting a significant input of Os from the mantle with low 187Os/188Os.
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© 2006 by The Geochemical Society of Japan
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