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Geological Society, London, Special Publications; 1987; v. 26; p. 153-166;
DOI: 10.1144/GSL.SP.1987.026.01.09
© 1987 Geological Society of London

Part II: Depositional and Environments

The formation of organic-rich deposits in two deep-water marine environments

R. J. Morris

Institute of Oceanographic Sciences, Wormley, Godalming, Surrey, U.K.

Organic-rich sediments have been collected from deep-water core sites in the Eastern Mediterranean (6500–9000 years BP) and the Guinea Basin (50,000–250,000 years BP estimated). The results of geochemical analyses suggest that similar processes may have been involved in their formation. The same processes are known to give rise to present day organic-rich oozes on the continental shelves off Peru and Namibia. The deep-water organic deposits are believed to have been a direct result of periods of greatly increased productivity in the overlying water column. Their formation is not thought to have involved the development of widespread stagnant conditions in the associated body of water, conditions which are often taken to be essential for the preservation of organic matter in deep water.





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[Abstract] [PDF]