Rift Lake Stratigraphy of the Lagoa Feia Formation, Campos Basin, Brazil
- Autores: Hamilton Duncan Rangel Rangel, Mario Carminatti
- Localización: Lake basins through space and time / coord. por Elizabeth H. Gierlowski-Kordesch, K. Kelts, 2000, ISBN 0891810528, págs. 225-244
- Idioma: inglés
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Resumen
Lower Cretaceous lacustrine basins occur rather continuously along about 3500 km (from Pelotas to Sergipe-Alagoas Basins) of the eastern Brazilian margin(Figure 1). Because these basins accumulated large volumes of organic-carbon-rich sediments, they form source rocks for much of the Brazilian oil discovered to date. Economic and scientific interest in these lacustrine basins has resulted in numerous publications(e.g., Ponte and Asmus, 1978; Ojeda, 1982; Estrella etal., 1984; Bertani and Carozzi, 1985; Baumgarten et al.,1988; Guardado et al., 1989; Van der Ven et al., 1989;Aquino and Lana, 1990; Cupertino, 1990; Mello and Maxwell, 1990; Santos and Braga, 1990; Castro, 1992;Horschutz and Scuta, 1992; Mato et al., 1992; Rangel etal., 1993a, b; Caixeta et al., 1994; Dias et al., 1994; Feijo,1994a, b; Pereira and Feijo, 1994; Rangel et al., 1994a, b;Santos et al., 1994; Teixeira Net to et al., 1994; Vieira etal., 1994; da Silva et al., this volume).
Several of these studies have attempted comparative syntheses. They emphasize differences in each basin system dependent on the tectonic evolution. For example, continental breakup is accompanied bybasaltic extrusions during initial stages of rifting, such as in the Campos Basin (Rangel et al., 1994a, b), orbasins may lack basaltic extrusions, such as in the Reconcavo Basin. Based on tectonic evolution, the eastern Brazilian Atlantic margin can be organizedinto basically two types of rift lake environments: (1)deep-water lakes, in which tectonism outpaced sedimentation,with the Reconcavo Basin, northeastern Brazil, for example, and (2) shallow water lakes in which tectonism and sedimentation maintain a balanced pace, such as in
