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Cretaceous Carbonate Platforms and Stratigraphic Sequences, South-Central Pyrenees, Spain

By
J. A. Toni Simo
J. A. Toni Simo
Department of Geology and Geophysics University of Wisconsin Madison, Wisconsin, U.S.A.
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Published:
January 01, 1993

Abstract

Name: Pyrenean basin

Author: J. A. Toni Simo

Location: From 46° to 47° north latitude and 1° to 2° east longitude. Tremp area, between Segre and Esera rivers, south-central Pyrenees

Geologic time interval: Cenomanian-Campanian (R. brotzeni to G. calcarata)

Tectonic-sedimentary setting: Alpine south-verging imbricated thrust sheets; tectonic synsedimentary setting dominated by flexural subsidence.

Basin type: Epeiric; transitional between rift and distal foreland basin

Paleoclimate: Semitropical, semiarid to arid; paleolatitude was 30° to 40° north

Platform types: Skeletal-rich carbonate shelf with well-defined facies belt. Coral and rudist reefs, rudist patch reefs, and locally coral buildups abundant; coastal clastic deposits rare. Platform depositional profile changed from rimmed platform to ramp.

Platform geometry: Average 30–50 km wide, 100–200 km long, and 50–500 m thick

Facies and fossils: Skeletal grainstones–packstone, wackestone, and framestone on platform; breccia and wackestone on slope; mudstone and wackestone on outer-shelf and basin. Benthic forams, molluscs, rudists, corals algae, and bryozoans.

Systems tracts: Cenomanian-Coniacian platforms contain lagoon, platform margin, upper slope, and basin facies. Santonian-Campanian platforms contain an additional outer shelf and lower slope facies between the upper slope and basin facies.

Stacking patterns: Seven depositional sequences with highstand carbonate platform facies. These seven platforms show a general backstepping of shallow water facies and internally show progradation geometries.

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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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