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Geology; October 2008; v. 36; no. 10; p. 811-814; DOI: 10.1130/G24999A.1
© 2008 Geological Society of America
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Nd isotopic excursion across Cretaceous ocean anoxic event 2 (Cenomanian-Turonian) in the tropical North Atlantic

Kenneth G. MacLeod*,1, Ellen E. Martin2 and Susanna W. Blair2

1 1 Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211, USA
2 2 Department of Geological Sciences, University of Florida, Gainesville, Florida 32611, USA

Correspondence: *E-mail: macleodk{at}missouri.edu.

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.

Key Words: ocean anoxic event 2 • black shale • Demerara Rise • Nd isotopes • Cenomanian-Turonian




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