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Abstract
Chapter from: SG
40: Paleogeography, Paleoclimate, and  Source Rocks
Edited By
Alain-Yves HucAuthor:
Allen R. Ormiston and Robert 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.
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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.
Robert 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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