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Abstract

The Recôncavo basin is located in northeastern Brazil, and occupies an area of 11,500 km2. It corresponds to the southern portion of an elongated intracontinental aulacogen that extends to the north, encompassing the Tucano and Jatobá basins (Figure 1). The basin is limited to the east by the Salvador fault, with a maximum dip slip of around 5000 m, and to the west by the Maragogipe fault, with an average vertical displacement of 200 m. To the north, the basin is separated from the Tucano basin by the Aporá high, while to the south its exposed portion is delimited by the Itacaré high (Figure 2). This asymmetric graben is basically filled with Upper Jurassic and Lower Cretaceous sediments, which characterize two major sedimentary sequences: the first, prerift, is composed of an arid alluvial fan system and associated facies; the second, synrift, is composed of alluvial, fluvial, and deltaic lacustrine sediments representing the complete record of infilling of a tectonically active lake basin. A thin package of Upper Cretaceous and Tertiary postrift coarse clastics partially covers the present-day basin. As a whole, the sedimentary section reaches a maximum thickness of about 6000 m, deposited over Archean granulites and, locally, over slightly metamorphosed Proterozoic rocks and Permian-Carboniferous sediments.

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