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Book Chapter

Rhythms and events in carbonate stratigraphy

Published:
January 01, 2005

Abstract

The standard facies model depicts depositional systems where sedimentation is in approximate equilibrium with intrinsic feedbacks and extrinsic controls. The assumption of equilibrium conditions is often unjustified and this chapter examines important causes of change in carbonate sedimentation with time.

Chapter 2 presented evidence that sedimentation is inherently episodic or pulsating and that the record is riddled with hiatuses in a wide range of scales. The scaling of sedimentation rates and the intense lamination of unbioturbated sediments are two major arguments in favor of a non-steady model of sedimentation. This “Cantor model” of sedimentation (Plotnick, 1986) does not invalidate facies models but limits their use. Facies models should be viewed as idealized equilibrium states that depositional systems strive to but do not always reach before being disturbed by extrinsic factors. The episodic nature of sedimentation implies that stratigraphic documentations solely in terms of standard facies belts, is inadequate and cannot do justice to the complexity of vertical successions. For carbonates, in particular, we need to consider changes through time imposed by system-internal feed back (“autocycles”), orbital cycles of the ocean-atmosphere system, organic evolution and long oscillations induced by plate tectonics and cosmic processes.

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Contents

SEPM Concepts in Sedimentology and Paleontology

Carbonate Sedimentology and Sequence Stratigraphy

Wolfgang Schlager
Wolfgang Schlager
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SEPM Society for Sedimentary Geology
Volume
8
ISBN electronic:
9781565761322
Publication date:
January 01, 2005

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