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Book Chapter

High Frequency Eustatic and Siliciclastic Sedimentation Cycles in a Foreland Basin, Upper Devonian, Appalachian Basin

By
Jonathan K. Filer
Jonathan K. Filer
Geology Department, The University of North Carolina, Chapel Hill, North Carolina 27599
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Published:
January 01, 1994

Abstract

During the Late Devonian, a thick clastic wedge, derived from a tectonically active source area to the east, was deposited in the Appalachian basin. The basinal facies of the wedge is composed of blackish-gray or dark-brown organic carbon-rich shales alternating with gray or greenish-gray non-organic shales. Five large (third-order or approximately 2 Ma or longer) black/gray shale cycles have been previously recognized in the New York outcrop belt, as well as in the subsurface throughout the basin. Eleven newly defined higher frequency basinwide organic/inorganic shale cycles occur within the relatively inorganic portion of one of the larger cycles. These higher frequency lithologic cycles represent the basinal expression of fourth-order (0.1-0.3 Ma) cycles of parasequence scale.

The stratigraphic position of these cycles can be traced into nearershore silty and sandy facies using subsurface gamma-ray logs, revealing a synchronous cyclicity. These correlations show that the eleven cycles can be subdivided into two stacked sets of basinwide progradational parasequence sets. This pattern is confirmed by correlation into the most distal portions of the basin and examination of patterns of thinning and convergence. A previously recognized major transgression occurs at the top of the interval which rapidly initiated a major period of organic-rich shale deposition (Huron/Dunkirk Shales). These stratigraphic patterns are interpreted to result from a series of minor eustatic sea-level cycles during Upper Devonian time.

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Contents

SEPM Concepts in Sedimentology and Paleontology

Tectonic and Eustatic Controls on Sedimentary Cycles

John M. Dennison
John M. Dennison
University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Frank R. Ettensohn
Frank R. Ettensohn
University of Kentucky, Lexington, Kentucky
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SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762275
Publication date:
January 01, 1994

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