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Abstract
Chapter from: SG
40: Paleogeography, Paleoclimate, and Source Rocks
Edited By
Alain-Yves HucAuthor:
F. S. P. van Buchem, P. L. Boer, I. N. McCave, J.-P. Herbin 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 13
*
The Organic
Carbon Distribution in Mesozoic Marine Sediments and the Influence of Orbital
Climatic Cycles
(England and the Western
North Atlantic) F. S. P. van Buchem
Institut Français
du Pétrole
Rueil-Malmaison, France
P. L. de Boer
University of Utrecht
Utrecht, The Netherlands
I. N. McCave
University of Cambridge
Cambridge, U.K.
J.-P. Herbin
Institut Français
du Pétrole
Rueil-Malmaison, France
*
ABSTRACT
The distribution of organic carbon in
marine sediments is commonly characterized by cyclicity at different time
scales. A detailed analysis of such cyclicity in three case studies of
Liassic and Kimmeridgian age in England and of Cenomanian age in the northwestern
Atlantic Ocean shows that specific processes playing at different time
scales control the storage of organic matter. Two scales are distinguished:
(1) large-scale trends (>3 m.y., 2nd- and 3rd-order cycles) are caused
by plate tectonics affecting paleogeography and topography, long-term eustatic
sea level, and climatic changes ("ice-house" and "green-house"); they define
the storage of organic matter worldwide by influencing productivity and
ventilation of deep water; and (2) small-scale trends (<3 m.y., 4th-
and 5th-order cycles) are caused by orbitally induced high-frequency glacio-eustatic
and other oceanographic and/or climatic changes. If general conditions
are favorable, the impact of these changes is a high-frequency signal of
oxygenation/dilution cycles, whose particular expression strongly depends
on the local sedimentary environment.
A consequence of the orbitally induced
climatic/oceanographic control of high-frequency sedimentary cycles is
that it has a regional (to worldwide)
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