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Geological Society, London, Special Publications; 1987; v. 26; p. 199-205;
DOI: 10.1144/GSL.SP.1987.026.01.12
© 1987 Geological Society of London

Part II: Depositional and Environments

Palaeo-upwelling and the distribution of organic-rich rocks

J. T. Parrish

Branch of Oil and Gas Resources, Office of Energy and Marine Geology, U.S. Geological Survey, Box 25046, M.S. 971, Denver Federal Center, Denver, Colorado 80225, U.S.A.

As many as half the world’s organic-rich rocks may have been deposited in upwelling zones.

This paper alludes to the way in which ancient upwelling zones may be predicted and the criteria by which such areas may be recognized from the sedimentary record. The predicted distribution of upwelling sites is compared with the distribution of organic-rich rocks, and the other probable indicators of upwelling, notably phosphatic rocks, glauconite and biogenic siliceous sediments. A correspondence is shown. This correspondence is consistent with not all upwelling zones being underlain by organic-rich sediments and with not all organic-rich sediments originating beneath areas of upwelling.