Cretaceous Carbonate Platforms and Stratigraphic Sequences, South-Central Pyrenees, Spain
J. A. Toni Simo, 1993. "Cretaceous Carbonate Platforms and Stratigraphic Sequences, South-Central Pyrenees, Spain", Cretaceous Carbonate Platforms, J. A. Toni Simo, Robert W. Scott, Jean-Pierre Masse
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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.
Figures & Tables
With the large amount of information from Cretaceous basins available for comparative studies in the early 1990s, it seemed appropriate and timely to make available these regional studies on carbonate platforms, aiming at a convenient and objective presentation in a standard format. This volume represents the result of that effort. It brings together 32 well-documented data sets on carbonate platforms from 17 countries, which represent a significant part of the spectrum of Cretaceous carbonate platforms in different geologic provinces and tectonic settings. Two introductory articles summarize some of the main aspects of the Cretaceous period, carbonate platforms, and economic resources, and review each case study. The objectives of this book are to document styles of formation, growth, and development of Cretaceous carbonate platforms and to compare platform geometries, dimensions, and styles of similar platforms but different tectonic-sedimentary settings.