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Book Chapter

Geologic Significance of Seismic Reflectors in the Deep Western North Atlantic Basin*

By
Brian E. Tucholke
Brian E. Tucholke
Woods Hole Oceanographic Institution
Woods Hole, Massachusetts 02543 U.S.A.
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Published:
January 01, 1981

Abstract

Several major seismic horizons in the deep basin of the western North Atlantic Ocean have been calibrated according to age and physical and lithologic character by JOIDES drilling. Three horizons are discussed that are representative of the spectrum of stratigraphic relations in the basin. Horizon which ranges from Hauterivian to Barremian in age, correlates with a sharp upward transition from limestones to black clays coincident with a rise in the calcite compensation depth. In Eocene time, sediments enriched in biogenic silica were widely deposited, and subsequent diagenesis formed chert beds; the upper Lower to lower Middle Eocene surface of these cherts correlates with Horizon Ac which is one of the strongest and most widespread reflectors in the basin. Widely distributed borehole data indicate that both Horizon β and Horizon Ac normally occur within continuously deposited sedimentary sections. Beneath the continental rise, Horizon Au correlates with a major unconformity eroded between Late Eocene and Early Miocene time by southward-flowing abyssal currents. The reflector may have limited chronostratigraphic significance because of lateral migration of the abyssal current system with time. Several simple models are used to assess potential age significance of the seismic and lithologic boundaries and are compared to borehole data.

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Contents

SEPM Special Publication

The Deep Sea Drilling Project: A Decade of Progress

John E. Warme
John E. Warme
Colorado School of Mines, Golden Colorado.
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Robert G. Douglas
Robert G. Douglas
University of Southern California, Los Angeles California
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Edward L. Winterer
Edward L. Winterer
Scripps Institution of Oceanography, La Jolla California
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SEPM Society for Sedimentary Geology
Volume
32
ISBN electronic:
9781565761629
Publication date:
January 01, 1981

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