--> Abstract: Upper Campanian, Maastrichtian and Danian Carbonates of the Paraíba Basin, NE Brazil: Facies Models and Sequence Stratigraphy, by Virginio H. Neumann, Jose A. Barbosa, Mario Lima Filho, and Gelson L. Fambrini; #90078 (2008)

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Upper Campanian, Maastrichtian and Danian Carbonates of the Paraíba Basin, NE Brazil: Facies Models and Sequence Stratigraphy

Virginio H. Neumann1, Jose A. Barbosa2, Mario Lima Filho1, and Gelson L. Fambrini1
1Geology, Federal University of Pernambuco, Recife, Brazil
2Geology-PRH26, Federal University of Pernambuco, Recife, Brazil

The Paraíba Basin is located in Northeast Brazil, and comprises the coastal area between Pernambuco Shear Zone to South and Mamanguape fault to North. The Paraíba Basin is subdivided into three sub-basins: Olinda (south), Alhandra (middle) and Miriri (north). This research proposes facies models and sequence stratigraphy studies of three formations (Itamaracá, Gramame and Maria Farinha) and two boundaries (Campanian-Maastrichtian and Maastrichtian-Danian) of the Olinda Sub-basin of the Paraíba Basin. Fifty three thin sections were studied to define the sedimentary facies and microfacies. The studied rocks are represented by the Itamaracá Formation sandstones (Upper Campanian), and the Gramame (Maastrichtian) and Maria Farinha (Danian) formation limestones and marls. The Itamaracá Formation is composed of carbonate cement sandstone and shales and at the top by carbonates with siliciclasts, representing lagoons and estuarine passing into a marine shallow-water environment suggesting an increase of marine influency related to a Highstand System Tract. At the top of this sequence there is a phosphatic layer (Campanian-Maastrichtian boundary), representing a maximum flood surface. The Gramame and Maria Farinha formations consist of two main lithofacies intercalations: limestone and marls, with bioturbation (thalassinoids). Towards the top of the Marinha Farinha Formation an increase of siliciclastic material in the carbonate platform was observed, suggesting which a regional marine regression was installed, representing a Lowstand System Tract. Around the Gramame and Maria Farinha contact (Maastrichtian-Danian boundary) there is a breccia layer composed by grey limestone with reworked clasts varying from centimeter to millimeter in length. This breccias layer is associated to an erosive event.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas