Submarine Channel Architecture Along a Slope to Basin Profile, Brushy Canyon Formation, West Texas
Michael H. Gardner, James M. Borer, 2000. "Submarine Channel Architecture Along a Slope to Basin Profile, Brushy Canyon Formation, West Texas", Fine-Grained Turbidite Systems, Arnold H. Bouma, Charles G. Stone
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Slope and basin-floor channel sand bodies in the Permian Brushy Canyon Formation comprise a depositional profile, along which changes in the facies architecture of a fourfold channelform hierarchy are compared. Channel complexes form sand bodies with serrated margins consisting of stacked channels that increase in offset basinward. Channels and complexes record “cut,” “fill,” and “spill” phases of bypass and deposition, with channel and over-bank deposition offset in time.
Upper slope siltstones encase the largest channelform sand bodies confined to intraslope depressions. Sediment bypass gives way to deposition down-profile, producing multistory, multilateral, and eventually distributary channel patterns. As complexes widen, “build” phase deposits that precede channelization, and spill-phase overbank deposits, thicken downprofile to equilibrate sandstone volumes inside and outside channels.