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A structuring event of Campanian age in western Venezuela, interpreted from seismic and palaeontological data

By
P. M. Cooney
P. M. Cooney
1
Red Sky Energy Pty Ltd Level 25
,
2 Chifley Square, Sydney, NSW 2000
,
Australia
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M. A. Lorente
M. A. Lorente
2
Apdo 281, Jumilla 30520
,
Spain
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Published:
January 01, 2009

Abstract

A period of structuring, uplift, non-deposition and/or erosion in the Campanian in Western Venezuela, different from the generally known Late Cretaceous event is proposed to explain: (1) a varying time gap (10 to 1 million years) from east to west across the Maracaibo basin between La Luna and Colón formations; (2) a correlating time gap of 11 million years between the Santonian and Upper Campanian sediments in the Barinas basin; (3) structuring at the Top La Luna seismic horizon in the southwestern, west and central parts of the Maracaibo basin which is not reflected in the overlying section; (4) different thickness patterns in the isopach maps for the units underlying the Top La Luna seismic level and the immediately overlying section at least in area of the Colón Unit; (5) an abrupt change in vitrinite reflectance values in the SW of the basin from 0.47–0.60% above to 1.09–1.80% below the top of La Luna Formation; and (6) fission track ages in the range 70–80 Ma in the Circum-Caribbean. The predominant north–south trend of this structuring suggests that it is related to changes on the dynamics of the South American plate boundary during Campanian that may have involved a major igneous and volcanic event registered 70–80 Ma.

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Contents

Geological Society, London, Special Publications

The Origin and Evolution of the Caribbean Plate

K. H. James
K. H. James
Aberystwyth University, Wales, UK
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M. A. Lorente
M. A. Lorente
Central University of Venezuela, Venezuela
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J. L. Pindell
J. L. Pindell
Tectonic Analysis Ltd, West Sussex, UK
Rice University, Texas, USA
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Geological Society of London
Volume
328
ISBN electronic:
9781862395763
Publication date:
January 01, 2009

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