Sequence Stratigraphy of Continental Rift Basins II: An Example from the Brazilian Cretaceous Recôncavo Basin
Since the early 1990s, several comprehensive and sometimes conflicting models of rift basin sequence stratigraphy have appeared, and the conceptual ideas are especially contradictory when dealing with the initiation of a rift and the associated stratigraphic record. The present paper, using the Recôncavo Basin (Brazil) as an example, shows that rift initiation is characterized by isolated and restricted faults that create incipient half-grabens, infilled with fluvial and deltaic facies. Approaching the phase of rift climax, the initial rift faults tend to link, forming a larger and deeper depositional area, recording lacustrine facies with an overall retrogradational trend. Hence, locally restricted fluvial sandstone at the base of the stratigraphic succession records the onset of the rifting phase, whereas the basal lacustrine mudstones found in other parts of the rift basin register an already more advanced rifting phase. When the rifting ends, the accommodation rate decreases, the sedimentation regime is progradational, and the rift basin is filled with fluvial, deltaic, and aeolian facies.
KeywordsRift basin Sequence stratigraphy Recôncavo Basin Brazil
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