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Refinement and Spectral Analysis of Plio-Pleistocene Oxygen and Carbon Isotopic Records
Dwight M. Trainor (1), Douglas F. Williams (1), Ian Lerche (1)
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 (Ma). The integration of both oxygen and carbon isotope stratigraphy provides a high resolution chemical chronostratigraphy for the Plio-Pleistocene. The composite 18O and 13C records have been divided into five time intervals to examine the spectral character of the composite records through time: 1) the entire record, 0 to 4.5 Ma, 2) the interval 0 to 0.8 Ma postdating the Brunhes-Matuyama paleomagnetic boundary 3) 0.8 to 2.4 Ma or initation of Northern Hemisphere glaciation, 4) 2.4 to 3.2 Ma, the period during the development of Northern Hemisphere glaciation, 5) 3.2 to 4.5 Ma or prior to Northern 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 Milankovitvh frequencies do not emerge as clean signals, but are associated with numerous other low and high period frequencies.
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