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Revista de la Asociación Geológica Argentina
versão impressa ISSN 0004-4822
Resumo
ALLARD, José O; PAREDES, José M; FOIX, Nicolás e GIACOSA, Raúl E. Conexión cretácica entre las cuencas del golfo San Jorge y cañadón Asfalto (Patagonia): paleogeografía, implicancias tectonoestratigráficas y su potencial en la exploración de hidrocarburos. Rev. Asoc. Geol. Argent. [online]. 2015, vol.72, n.1, pp.21-37. ISSN 0004-4822.
The Chubut Group (Cretaceous) of the Golfo San Jorge Basin begins with a fluvial-lacustrine depositional system associated with the Matasiete-Pozo D-129 Formations (Barremian?-Aptian). This contribution evaluates the correlation among the Matasiete Formation and its temporaly-equivalent units in the Cañadón Asfalto Basin. The fluvial succession of the Los Adobes Formation was characterized in cañadón Puelman and cerro Punta Toro Hosco, in the northwestern margin of the basin. The fluvial sandbodies have a mean maximum thickness (T) of 7 m, a mean real width/maximum thickness ratio (W/t) of 10 and paleoflow direction toward 168º. The Cerro Fortín Formation was analyzed near cerro Ferrarotti; the fluvial channels have mean values of T: 4,6 m, W/t: 16, and a mean paleoflow direction toward 162º. The Matasiete Formation outcrops downstream of both localities and its fluvial channels show a mean T: 7,3 m, W/t: 14 and a paleotransport direction toward S-SE. A similar lithological appearance, uniform paleoflow directions and comparable geometries of the paleochannels support the physical correlation among the above-mentioned lithostratigraphical units. By using modern analogues, a minimum drainage area of ~160000 km2 was estimated for the Pozo D-129 Formation, with individual watersheds of ~4000 km2. The results support a paleogeographic scenario with regional fluvial systems that flow from the north-northwest using tectonically-driven sedimentary corridors. The characterization of a continental depositional system connecting areas of the Cañadón Asfalto and Golfo San Jorge basins defines potential guidelines for prospecting hydrocarbon reservoirs in frontier areas.
Palavras-chave : Golfo San Jorge Basin; Cañadón Asfalto Basin; Chubut Group; Aptian; Sedimentary corridors.