Skip to Main Content
Book Chapter

Tectonism, Sea-Level Change, and Paleoclimate: Effects on Atlantic Passive Margin Sedimentation

By
C. Wylie Poag
C. Wylie Poag
United States Geological Survey, Woods Hole, MA 02543
Search for other works by this author on:
Published:
January 01, 1994

Abstract

I have used >10,000 line-km of multichannel seismic-reflection profiles and 88 key boreholes to map 23 postrift Mesozoic and Cenozoic depositional sequences of the U. S. Middle Atlantic margin. From these data I infer that tectonic uplift was consistently a dominant force in determining the architecture and distribution of the sequences. Relative uplift among three primary source terrains directly determined the location of siliciclastic dispersal routes, rates of sediment accumulation, and the latitudinal position of associated offshore depocenters.

The principal role of sea-level change appears to have been to distribute and redistribute sediments once they reached the basin complex. Sea-level change was particularly effective during long-term rises and short-term falls, when it determined the bathymetric position of depocenters. A marked increase in sediment supply (triggered by source-terrain uplift), however, could mask the effects of short-term sea-level rise. Moreover, in the absence of tectonic uplift, major sea-level falls generally did not accelerate sediment accumulation.

Paleoclimatic shifts appear to have influenced deposition most effectively when associated with extreme conditions, such as extensive aridity or the buildup of continental ice sheets. But the relative amount of carbonate production on the continental shelves also was responsive to paleoclimatic change.

You do not currently have access to this article.

Figures & Tables

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
Search for other works by this author on:
Frank R. Ettensohn
Frank R. Ettensohn
University of Kentucky, Lexington, Kentucky
Search for other works by this author on:
SEPM Society for Sedimentary Geology
Volume
4
ISBN electronic:
9781565762275
Publication date:
January 01, 1994

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal