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Book Chapter

Maracaibo Platform (Aptian–Albian), Northwestern Venezuela

By
Volker C. Vahrenkamp
Volker C. Vahrenkamp
Shell Research Rijswijk, The Netherlands
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Raymond C. W. M. Franssen
Raymond C. W. M. Franssen
Shell Research Rijswijk, The Netherlands
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Jürgen Grötsch
Jürgen Grötsch
Shell Research Rijswijk, The Netherlands
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Pedro J. Munoz
Pedro J. Munoz
Maraven, Exploration and Production Caracas, Venezuela
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Published:
January 01, 1993

Abstract

Name of platform: Maracaibo platform

Authors: Volker C. Vahrenkamp, R. C. W. M. Franssen, J. Grötsch, and P. J. Munoz

Location: From 70° to 73° east longitude and 8° to 11° north latitude, northwestern Venezuela

Geologic time interval: Early Aptian to late Albian

Tectonic-sedimentary setting: Abandoned Jurassic rift graben at the passive margin of the South American craton (Guyana shield)

Basin type: Abandoned rift sag on passive continental margin

Paleoclimate: Humid tropical

Platform type: Distally steepened(?) ramp with localized shoals

Platform geometry: Less than 100 m thick in the southeast and more than 370 m thick in the northwest. The extent of shallow water carbonate deposition reached more than 180 km (southeast-northwest) by 450 km (southwest-northeast)

Facies and fossils: Siliciclastic siltstone, mangrove peat, dolomitic oyster boundstone, milliolid wackestone, orbitolina wackestone–packstone, bioclastic and bioturbated grainstone–packstone, cross-bedded bioclastic and oolitic grainstone

Systems tracts: Trangressive system tracts: shallow marine, high energy, open platform packstone and grainstone. Highstand system tracts: mixed carbonate–siliciclastic, low energy, shallow marine lagoonal deposits. Lowstand system tract: not documented. A shift of shallow water carbonates into slope and basinal settings to the west (Machiques trough) and probably to the north of the study area is likely but has not been observed.

Stacking patterns: Initial transgression upon basal siliciclastics; as many as six large-scale (third-order) laterally correlated transgressive—regressive cycles; numerous smaller scale (fourth- and fifth-order?) shallowing upward cycles; upper boundary well defined by drowning surface overlain by regionally extensive deep marine carbonates of the latest Albian–Cenomanian La Luna Formation.The Maracaib oplatform

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Contents

AAPG Memoir

Cretaceous Carbonate Platforms

J. A. Toni Simo
J. A. Toni Simo
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Robert W. Scott
Robert W. Scott
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Jean-Pierre Masse
Jean-Pierre Masse
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810973
Publication date:
January 01, 1993

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