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Southern hemisphere early cretaceous (Valanginian-Early barremian) carbon and oxygen isotope curves from the neuquen basin, Argentina

Aguirre-Urreta, Maria B. and Price, Gregory D. and Ruffell, Alastair H. and Lazo, Dario G. and Kalin, Robert M. and Ogle, Neil and Rawson, Peter F. (2008) Southern hemisphere early cretaceous (Valanginian-Early barremian) carbon and oxygen isotope curves from the neuquen basin, Argentina. Cretaceous Research, 29 (1). pp. 87-99.

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Abstract

The first carbon and oxygen isotope curves for the Valanginian to Early Barremian (Early Cretaceous) interval obtained from outcrops in the Southern Hemisphere are presented. They were obtained from well-dated (by ammonites) sediments from the Neuquén Basin, Argentina. Measurements were acquired by the innovative method of analysing fossil oyster laminae. The occurrence of the well-established mid-Valanginian positive carbon isotope excursion is documented, while less well-marked positive events may also correlate with peaks identified in the well-known successions of SE France. The mid-Valanginian positive carbon isotope event in the Neuquén Basin is possibly associated with organic-rich sediments. A similar relationship is seen in the European Alps and in oceanic cores in some areas of the world.