Fill‐and‐Spill, Tilt‐and‐Repeat (FaSTaR) cycles: Stratigraphic evolution above a dynamic submarine stepped slope
نویسندگان
چکیده
The classic fill-and-spill model is widely applied to interpret topographic controls on depositional architecture and facies distributions in slope successions with complicated topography. However, this implies a constant configuration over the lifespan of turbidite system. In contrast, impact patterns erosion deposition above dynamic slopes whose varies spatially time remains poorly investigated. Here, using high-resolution 3D seismic reflection data more than 100 wells from 40 km long stepped system (Campos Basin, offshore Brazil), we document evolution sand-prone active during Oligocene-Miocene transition. This was influenced by vertical lateral deformation, propose new stratigraphic explain resultant architecture. Two depocentres were identified as steps, channels proximal step, channel-lobe complexes distal bounded sediment bypass-dominated ramps. Lateral stepping oblique stacking down-dip lobe complexes, each cut through-going channels, indicate multiple cycles. A persistent NE-ward thickening steps interpreted reflect tilting seafloor driven salt tectonics. substrate prevented establishment single long-lived conduit across recorded systems fixed configurations. filling mud at end cycle suggests waxing-to-waning supply cycles periods sand starvation, when dominated drove avulsion feeder towards lows. study demonstrates that subtle deformation punctuated discrete results complex phases, entry exit points, repeated fill-and-spill, tilt-and-repeat (FaSTaR). These are likely be present other systems.
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ژورنال
عنوان ژورنال: Basin Research
سال: 2022
ISSN: ['1365-2117', '0950-091X']
DOI: https://doi.org/10.1111/bre.12700