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Sangmin Hyun,Naokaze Ahagon,Ho-Il Yoon 한국지질과학협의회 2005 Geosciences Journal Vol.9 No.3
Sediments from Ocean Driling Program (ODP)Sites 980 and 983 in the North Atlantic Ocean were analyzed toobtain evidence of long-range Milankovitch cycles and to examinethe cycles’ effect on the paleoceanographic evolution of the NorthAtlantic Ocean. Wide cyclic variations in total organic carbon andbiogenic carbonate occur throughout the columns at both sites andprovide distinctive characteristics of both sediment groups. Spec-tral modeling of these variations shows typical 100-ka cyclic vari-ations in both the total organic carbon (TOC) and carbonate recordsat Site 980, although this 10-ka Milankovitch frequency occursonly in the uper, ~472.5 ka, section of the core. In Site 983, only400-ka cycle in carbonate is observed but the 10-ka cycle in TOCand carbonate is absent. The terrigenous content, expressed interms of K, Al, Ti, and Th, also shows strong 100-ka and 400-kacyclic variations at Site 983. The earth’s eccentricity as expressedand precession (23-ka) are important characteristics of North Atlan-tic Ocean sediments. Milankovitch pulse differences in carbonate,TOC at the two sites likely arise from the evolution of paleocean-ography. The dilution of carbonate fractions by terrigenous mate-rials (indicated by the cyclical behavior of trace elements) at Site 983is one of plausible explanation. Climatic warming over the last 600ka probably caused the differences in the sedimentary cycles at thetwo sites; induced meltwater discharge is recorded in the terrige-nous record, and changes in the oceanic circulation system arerelated to major glacialinterglacial climatic episodes that probablyunderlie the differences in the cyclical records.
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