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Deposition of Ooid Shoals Marginal to the Late Cambrian Proto-Atlantic (Iapetus) Ocean in New York and Alabama: Influence on the Interior Shelf

By
Linda Raine Sternbach
Linda Raine Sternbach
Department of Geology, Rensselaer Polytechnic Institute, Troy, New York 12181
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Gerald M. Friedman
Gerald M. Friedman
Department of Geology, Rensselaer Polytechnic Institute, Troy, New York 12181
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Published:
January 01, 1984

Abstract

Shoal deposits of ooids mark the rim of the peri tidal Late Cambrian carbonate platform that formerly extended along the eastern United States. These oolites are evidence of tidal activity on the Iapetus (Proto-Atlantic) shelf edge. Buildup of shoals not only controlled circulation to interior shelf environments, but were themselves diagenetically altered by former zones of hypersalinity.

Reports of oolites (Steele, 1825) from the Upper Cambrian Hoyt Formation of New York State announced the first discovery of those particles in North America. This study reveals that they are strati graphically equivalent to subsurface oolite lenses within the Conasauga Formation of central Alabama. Alabama ooid textures indicate former proximity to shelf interior hypersalinity, including radial-fibrous fabrics, euhedral authigenie quartz and intraparticle secondary dolomitization. New York ooids received far more detrital quartz, indicating shoaling took place closer to a cratonic source. Both oolites underwent early cementation by marine pore waters and extensive burial pressure solution creating stylolitic seams and secondary dolomitization.

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Contents

SEPM Core Workshop Notes

Carbonate Sands-A Core Workshop

Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
5
ISBN electronic:
9781565762602
Publication date:
January 01, 1984

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