--> ABSTRACT: Refinement and Spectral Analysis of Pliocene-Pleistocene Oxygen and Carbon Isotopic Records, by Dwight M. Trainor, Douglas F. Williams, and Ian Lerche; #91036 (2010)

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Refinement and Spectral Analysis of Pliocene-Pleistocene Oxygen and Carbon Isotopic Records

Dwight M. Trainor, Douglas F. Williams, Ian Lerche

Stable oxygen and carbon isotope data from numerous deep-sea cores have been compiled and composite isotope records constructed for the last 4.5 million years. The integration of both oxygen and carbon isotope stratigraphy provides a high-resolution chemical chronostratigraphy for the Pliocene-Pleistocene. The composite ^dgr18O and ^dgr13C records have been divided into five time intervals to examine the spectral character of the composite records through time: (1) the entire record, 0-4.5 Ma, (2) 0-0.8 Ma including the section above the Brunhes-Matuyama paleomagnetic boundary, (3) 0.8-2.4 Ma or post Northern Hemisphere glaciation, (4) 2.4-3.2 Ma, the period during the development of Northern Hemisphere glaciation events, and (5) 3.2-4.5 Ma or pre-No thern Hemisphere glaciation. The power spectra of these time intervals display significant power in many frequencies, including those known as the Milankovitch orbital parameters (eccentricity at 100,000; obliquity at 41,000; and precession at 23,000 years). The Milankovitch frequencies do not emerge as clean signals but are associated with numerous other low- and high-period frequencies.

AAPG Search and Discovery Article #91036©1988 GCAGS and SEPM Gulf Coast Section Meeting; New Orleans, Louisiana, 19-21 October 1988.