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Upper Aptian–Lower Coniacian Carbonate Sequences in the Sergipe Basin, Northeastern Brazil

By
Eduardo A. M. Koutsoukos
Eduardo A. M. Koutsoukos
Petrobrás–Cenpes Cidade Universitária Rio de Janeiro, Brazil
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Nivaldo Destro
Nivaldo Destro
Petrobrás-Denest Aracajú, Brazil
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Nilo C. de Azambuja Filho
Nilo C. de Azambuja Filho
Petrobras-Cenpes Cidade Universitaria Rio de Janeiro, Brazil
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Adali Ricardo Spadini
Adali Ricardo Spadini
Petrobras-Cenpes Cidade Universitaria Rio de Janeiro, Brazil
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Published:
January 01, 1993

Abstract

Name: Riachuelo and Continguiba carbonate systems, Sergipe basin

Authors: Eduardo A. M. Koutsoukos, Nivaldo Destro, Nilo C. de Azambuja Filho, and Adali Ricardo Spadini

Location: From 9° to 11 ° 30' south latitude and 35° 30' to 37° west longitude, Sergipe, northeastern Brazil

Geologic time interval: Middle Cretaceous, late Aptian–early Coniacian (Epicheloniceras sp-Diadochoceras sp.–Eodouvilleiceras sp. zone to the Solgerites armatus–Prionocycloceras lenti zone)

Tectonic-sedimentary setting: Formed by a series of half-grabens with a regional dip averaging 10–15° to the southeast, resulting from normal faults arranged in a northeast-southwest direction

Basin type: Atlantic-type passive marginal basin

Paleoclimate: Dominantly dry, semi-arid, tropical

Platform types: Mixed carbonate–siliciclastic system (late Aptian-Albian Riachuelo Fm.) and carbonate ramp system (Cenomanian–early Coniacian Cotinguiba Fm.)

Platform geometry: Riachuelo carbonate system: average thickness of 500 m, but locally attains a maximum of 1700 m; about 20 km wide and 115 km long onshore. Cotinguiba carbonate system: thickness ranging from 200 m to over 1000 m locally in the onshore part; about 5–10 km wide and 200 km long onshore.

Facies and fossils: Riachuelo Fm: oncolitic–oolitic–bioclastic packstone–grainstone; fine-grained limestone, marlstone, and shale; conglomerate, sandstone, and siltstone. Ammonites, planktonic and benthonic foraminifera, ostracods, radiolarians, algae, bivalves, brachipods, gastropods, serpulids, crustaceans, corals, echinoderms, and fishes. Cotinguiba Fm: rhythmic fine-grained carbonate mudstone, marlstone, shale, and wackestone breccia. Ammonites, nautiloids, planktonic and benthonic foraminifera, ostracods, radiolarians, diatoms, calcispheres, siliceous sponge spicules, bivalves, brachipods, gastropods, serpulids, crustaceans, cirripeds, corals, bryozoans, echinoderms, fishes, and reptiles.

Systems tracts: lagoonal, neritic, upper bathyal, basin

Stacking patterns: Not determined

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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

GeoRef

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