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Book Chapter

Origin and Significance of Evaporites in Basins Around the Atlantic Margin

By
Robert Evans
Robert Evans
Mobil Exploration & Production Services, Inc. Dallas, TX.
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Published:
January 01, 1977

Abstract

Immediately before the rifting and disruption of Pangaea, that great continent lay athwart the Triassic equator. The continental interior was arid, and isostatic adjustments following rifting produced drainage flowing away from the newly-formed elongate troughs. These climatic and physiographic conditions led inevitably to the deposition of evaporites as the sea entered the rift zones whose margins now form the edges of the continents around the Atlantic. As a result, the sediment sequence in the Atlantic coastal basins shows a change from continental to evaporitic to normal marine conditions, except where evaporites were deposited directly onto newly-formed oceanic crust. The age of these evaporites gives a chronology for the establishment of a permanent body of water between the separting fragments of Pangaea. The North Atlantic appeared in the north in late Triassic time and became established further south by Middle Jurassic. The South Atlantic became established during Aptian time. The Gulf of Mexico came into existence in Middle Jurassic time by the subsidence of continental material. The union of the two parts of the incipient ocean came about during or later than Albian time and the resulting free circulation of water in the Atlantic eliminated the restriction necessary for the continued accumulation of evaporite deposits. No such deposits are known, therefore, from the northern coast of Brazil or from the northern side of the Gulf of Guinea.

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Contents

AAPG Continuing Education Course Notes Series

Geology of Continental Margins

Joseph R. Curray
Joseph R. Curray
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William R. Dickinson
William R. Dickinson
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Wallace G. Dow
Wallace G. Dow
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Kenneth O. Emery
Kenneth O. Emery
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Donald R. Seely
Donald R. Seely
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Peter R. Vail
Peter R. Vail
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Hunter Yarborough
Hunter Yarborough
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American Association of Petroleum Geologists
Volume
5
ISBN electronic:
9781629812021
Publication date:
January 01, 1977

GeoRef

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