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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Edited by Authors:
Published
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Maracaibo Basin, Venezuela |
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Isopach maps show that the
Paleocene-Eocene depocenter of the Maracaibo basin was an asymmetric, elongate
trough containing up to 7 km of Paleocene-Eocene clastic rocks. The main
Paleocene-Eocene depocenter is flanked on its north and northeast margin
by a partially exposed south-southwest verging fold and thrust belt. Isopach
mapping suggests a northwest-southeast migration of the depocenter from
Paleocene to middle Eocene time. Previous work on sandstone composition,
paleocurrent measurements, and seismic reflections of prograding clinoforms
all support the idea that the basin formed as a foreland depression in
front of a west-southwest verging fold and thrust belt along the eastern
side of the basin. This model contrasts with a previous interpretation
that deltaic systems in a passive margin setting south and southwest of
the basin were the main source areas. A similar style of younger foreland
basin has been previously identified over a distance of 1000 km in central
and eastern Venezuela and Trinidad. Eocene-Recent ages of foreland basin
sedimentation in these areas suggest time-transgressive oblique collision
of an exotic Pacific-derived Caribbean plate along the northern passive
margin of continental South America. |
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