Equatorial Pacific Seismic Reflectors as Indicators of Global Oceanographic Events


The origin of a series of regionally correlatable seismic horizons in the Neogene sediments of the centralequatorial Pacific is examined through seismic modeling and the detailed analyses of stratigraphic and physical property relationships in Deep Sea Drilling Project cores. These regionally traceable reflectors are synchronous; the younger reflectors are the direct result of carbonate dissolution events, the older ones ofstratigraphically selective diagenetic processes. The changes in ocean chemistry associated with theseevents appear to be linked to global reorganizations of surface and bottom-water circulation patterns, the most dramatic of which are associated with reorganizations of North Atlantic bottom waters. These deepwaterseismic horizons appear to correlate with the major events on the "relative sea-level" curve of Vail et al. for the Neogene.

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American Association for the Advancement of Science (AAAS)

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