Journal
GEOLOGY
Volume 36, Issue 10, Pages 811-814Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G24999A.1
Keywords
ocean anoxic event 2; black shale; Demerara Rise; Nd isotopes; Cenomanian-Turonian
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Funding
- U.S. National Science Foundation (NSF)
- U.S. Science Support Program
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Late Cretaceous fish debris from Demerara Rise exhibits a dramatic positive excursion of 8 epsilon(Nd) units during ocean anoxic event 2 (OAE2) that is superimposed on extremely low epsilon(Nd(t)) values (-14 to -16.5) observed throughout the rest of the studied interval. The OAE2 epsilon(Nd) excursion is the largest yet documented in marine sediments, and the majority of the shift is estimated to have occurred over <20 k.y. Low background epsilon(Nd) values on Demerara Rise are explained as the Nd isotopic signature of the South American craton, whereas eruptions of the Caribbean large igneous province or enhanced mixing of intermediate waters in the North Atlantic could have caused the excursion.
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