Many deep-sea fan and sheet
systems include deposits of rheologically complex sediment gravity currents (“hybrid
flows”) with suggestions of turbulent, transitional and laminar flow character,
most commonly interpreted to represent deposition in more distal regions. In
this paper, Patacci et al. describe
a succession deposited as strata that onlap a confining slope. The
sedimentology and geometry of these strata illustrate that hybrid
flow-associated deposits can occur in proximal settings, and on scales of just
100s of meters, given a confining topography (e.g., onlap) that transforms the
flows. This flow hybridization mechanism provides an alternative explanation
for the occurrence of clay-rich facies development at the foot of
flow-confining seafloor slopes, and may be important for predicting trends in
reservoir quality in subsurface analogs.
Rheological complexity in sediment gravity flowsforced to decelerate against a confining slope, Braux, SE France by Marco Patacci, Peter D.W. Haughton, and William
D. McCaffrey
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