Skip to Main Content
Book Chapter

Basement and Paleozoic rocks of the Venezuelan Llanos basins*

By
Gustavo Feo-Codecido
Gustavo Feo-Codecido
Search for other works by this author on:
Foster D. Smith, Jr.
Foster D. Smith, Jr.
Search for other works by this author on:
Nelson Aboud
Nelson Aboud
Search for other works by this author on:
Estela de Di Giacomo
Estela de Di Giacomo
Search for other works by this author on:
Published:
January 01, 1984

The igneous and metamorphic rocks of Venezuela may be classified in three geographic units: a southern Precambrian Shield, an intermediate belt of Paleozoic age and a northern border of Mesozoic to Tertiary age. The shield is exposed in the south; it extends northward under a sedimentary cover to an inferred contact with the metamorphosed Paleozoic or Mesozoic-Tertiary rocks. South of this contact, in the eastern states of Anzoátegui and Monagas, the shield's oldest known sedimentary cover is of Cretaceous age; to the west, it is of Cambrian age.

A graben is identified in the State of Guarico, located approximately along the contact of the Paleozoic basement with the Precambrian Shield. It contains a 2,390 m (7,840 ft) column of sedimentary rocks of Carboniferous and Jurassic age, not previously identified in the Barinas-Apure and Eastern Venezuela basins. Preliminary interpretation of recently acquired aeromagnetic data indicates that this feature forms part of a much longer graben, hitherto not known, which may extend westward from near Barcelona, Anzoátegui, to the Colombian border at approximately 70° 00' West Longitude, 7° 10' North Latitude, a distance of 600 km (375 mi).

You do not currently have access to this article.

Figures & Tables

Contents

GSA Memoirs

The Caribbean-South American Plate Boundary and Regional Tectonics

William E. Bonini
William E. Bonini
Search for other works by this author on:
Robert B. Hargraves
Robert B. Hargraves
Search for other works by this author on:
Reginald Shagam
Reginald Shagam
Search for other works by this author on:
Geological Society of America
Volume
162
ISBN print:
9780813711621
Publication date:
January 01, 1984

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