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Foundering of the Cambro-Ordovician Shelf Margin: Onset of Taconian Orogenesis or Eustatic Drowning

By
Paul A. Washington
Paul A. Washington
1
1385 South West Broad Street, Southern Pines, North Carotina 28387
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Steven A. Chisick
Steven A. Chisick
2
Sevenson Environmental Services, 9245 Calumet Avenue, Munster, Indiana 46321
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Published:
January 01, 1994

Abstract

Onset of the Taconic Orogeny is generally dated by the age of the last shelf strata beneath Ordovician pelitic sequences. Recent stratigraphic analysis of the shelf sequence in the Champlain Valley, however, suggests that timing of the end of shelf sedimentation in a given area was controlled by eustasy as well as tectonics. Following major eustatic lowstands in Cambrian and Early-Middle Ordovician time, the shelf margin abruptly jumped cratonward and large areas of outer shelf foundered. Only by analyzing subsidence (stratigraphic accumulation) rates can the timing of the orogenic event be determined. Analysis of subsidence rates indicate a simultaneous start of the initial phase of orogenic subsidence in late Early Ordovician time for the entire shelf from Newfoundland to Pennsylvania. Arrival of the orogenic wedge varied from Middle Ordovician (Newfoundland) to early Late Ordovician (Champlain Valley) 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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