The Deep-Sea Record: Major Steps in Cenozoic Ocean Evolution
W. H. Berger, Edith Vincent, H. R. Thierstein, 1981. "The Deep-Sea Record: Major Steps in Cenozoic Ocean Evolution", The Deep Sea Drilling Project: A Decade of Progress, John E. Warme, Robert G. Douglas, Edward L. Winterer
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The deep-sea record shows that certain changes in the climate-producing “exogenic” system, provoked through tectonic forces and amplified by internal feedback mechanisms, result in step-like transitions from one climatic state to another. Such steps are important as natural experiments, for the purpose of studying response characteristics of the system, and for establishing high-resolution stratigraphy on a global scale.
An important step-producing mechanism is the buildup of disequilibrium potential within transient reservoirs of hydrosphere, biosphere, or reactive lithosphere, which can collapse under certain conditions. Examples of transient reservoirs are ice caps, the water of isolated basins and their deposits, and readily accessible organic carbon accumulations (“dead” carbon sphere and biosphere).
Event analysis attempts to identify the step-producing mechanism. It considers the following questions: is the event part of a trend? Is it a reversible phenomenon, and does it initiate a more stable climatic regime, or a less stable one? The identification of the nature of positive feedback associated with an event is crucial for such analyses.
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At the present the Glomar Challenger has drilled over 500 holes over the world ocean, involving hundreds of scientists from dozens of countries. This volume is intended as a review of some of theimportant results from the most comprehensive, ambitious and successful earth-bound geologic project ever undertaken. The symposium upon which this volume originated was held April 4, 1979 at the SEPM/AAPG Annual Meeting in Houston. No comprehensive synthesis of all aspects of the DSDP has appeared, and the topic coverage in this volume is biased towards the sediments and fossils, and their significance for certain aspects of earth history – paleogeography, bathymetry, climatology, oceanography, ecology, environments – all in keeping with the audience of sedimentary geologists.