A NEW METHOD FOR THE CHRONOMETRY OF OXYGEN-ISOTOPE RECORDS IN DEEP-SEA SEDIMENTARY CORES

Abstract

Based on the orbital-climatic diagram (OCD) elaborated by the author of this work [1, 2], chronometry of the oxygen-isotope (OI) curve of Core MD 900 963 studied by Bassinot et al. [3] was carried out. The present paper demonstrates advantages of this chronometry for the spectral analysis of OI data relative to the commonly used laborious procedures of the identification of orbital periods. Thus, a previously overlooked significant period of climatic variations (~29.4 ka) with the spectral amplitude exceeding that of precession peaks was revealed in the OI record.