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Abstract


 
Chapter from: SG 40:  Paleogeography, Paleoclimate, and Source Rocks
Edited By 
Alain-Yves Huc

Author: 
Allen R. Ormiston and Previous HitRobertNext Hit J. Oglesby

Geochemistry, Generation, Migration

Published 1995 as part of Studies in Geology 40
Copyright © 1995 The American Association of Petroleum Geologists.   All Rights Reserved.
 
Chapter 5

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Effect of Late Devonian Paleoclimate on Source Rock Quality and Location

Allen R. Ormiston

Amoco E&P Technology

Tulsa, Oklahoma, U.S.A.

Previous HitRobertTop J. Oglesby

Purdue University

West Lafayette, Indiana, U.S.A.

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ABSTRACT


Late Devonian climate was very different from the present. With most of the landmass in equatorial or high-latitude regions, there was little monsoonal activity. Precipitation maxima coincided with elevations. No perennial snowcover existed because of Gondwanan dryness. Low-latitude sea surface temperatures ranged between 17 and 34°C, high enough to kill reefs, leading to increased volume of plankton reaching epeiric seas. Upwellings explain only a minority of Upper Devonian source rocks. Far more source rocks were produced by conditions best described by the epeiric sea model. Anoxia was promoted by salinity stratification and/or low seasonality.

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