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Abstract
Chapter from: SG
40: Paleogeography, Paleoclimate, and Source Rocks
Edited By
Alain-Yves HucAuthor:
George T. Moore, Eric J. Barron, and Darryl N. Hayashida 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 7
*
Kimmeridgian
(Late Jurassic) General Lithostratigraphy and Source Rock Quality for the
Western Tethys Sea Inferred from Paleoclimate Results Using a General Circulation
 Model George T. Moore
Eric J. Barron
The Pennsylvania State
University
University Park, Pennsylvania,
U.S.A.
Darryl N. Hayashida
Chevron Petroleum Technology
Company
La Habra, California,
U.S.A.
ABSTRACT
The application of any General Circulation
Model (GCM) simulation is only as valuable as: the quality of the original
input boundary conditions, the computer model used and its track record
for producing quality paleoclimate simulations, and the extent to which
the simulation results have been tested successfully with the geologic
record. We utilize a global simulation of the Kimmeridgian (Late Jurassic)
to focus on an area of investigation. The simulation was tested against
the geologic record. The results replicate the paleoclimate with a consistency
that is acceptable, if not impressive. Therefore, the results can be utilized
to map the distribution of climatically sensitive sediments within a given
area.
The study area includes the western part
of the Tethys Sea, which was a zonally oriented tropical sea at a paleolatitude
of about 0°-25°N and isolated from the Panthalassa Ocean by an
isthmus. The sea was characterized by warm tropical surface water and generally
strong net evaporation creating conditions of low oxygen content and elevated
salinities in the surface water mass. Much of the margin receives insufficient
precipitation to maintain lasting soil moisture or generate runoff to the
sea in any season, precluding development of a lush vegetative cover. The
general lack of runoff improves conditions for reef growth and carbonate
deposition on the continental shelves. Much of the margin possesses wind-driven
coastal upwelling. As a positive correlation exists between upwelling and
high primary productivity on the margins of today's World Ocean, we predict
that a similar relationship occurred in the Kimmeridgian Western Tethys
Sea.
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