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.