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Guyana Basin, Offshore Northeast South America

By
P.C.H. Veeken
P.C.H. Veeken
K.S.E.P.L.—Rijswijk
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Published:
January 01, 1983

Abstract

The western part of the line is presented again here because it (1) shows many interesting and significant structural and stratigraphic features, (2) shows the thick sedimentary section that fills the deep central Gulf basin, (3) shows the six deep-Gulf seismic stratigraphic units defined by UTIG in their "type" area (Shaub et al, in press), and (4) summarizes the geologic history of the deep south-central Gulf of Mexico basin. Discussion of this geologic history can be conveniently subdivided into two major periods, the pre-middle Cretaceous and the post-middle Cretaceous. Rocks representing these two periods are separated by a prominent unconformity and/or reflector that can be followed and mapped throughout the deep Gulf basin and adjacent margins. It has been dated tentatively as middle Cretaceous in age (Buffler et al, 1980, 1981; Addy and Buffler, in press; Shaub et al, in press). Recent DSDP drilling (Leg 77) in the southeastern Gulf indicates that the unconformity in this region is a condensed section that spans the entire Late Cretaceous (Schlager et al, in press). This unconformity and/or reflector is informally designated "MCU" for middle Cretaceous unconformity.

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Contents

AAPG Studies in Geology

Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces

A. W. Bally
A. W. Bally
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American Association of Petroleum Geologists
Volume
15
ISBN electronic:
9781629810188
Publication date:
January 01, 1983

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