As study of
the deep-water fans deposits has advanced to progressively finer scales, debate
regarding the nature and origin of stacking patterns has become refined. To
quantitatively test conceptual models, Terlaky and others statistically analyze
stacking patterns of stratal elements in the Proterozoic Upper Kaza Group
(Windermere Supergroup, Cariboo Mountains, southern Canadian Cordillera) by
Markov-chain analysis, an under-utilized tool in deep-water sedimentologic
research. The results of the analysis shows that the stacking pattern in this
passive-margin sedimentary pile is statistically non-random, and is more
heterogeneous than would be expected in a random distribution. These
observations form the basis for a conceptual model for lobe development driven
by splay deposition and frequent avulsion. Beyond showing the utility of
the tool, the results are interpreted to be significant for reservoir
characterization in similar passive-margin settings, providing analogs and data
on thicknesses, volumes, and connectivity of stratal elements and reservoir
bodies.
The control
of terminal-splay sedimentation on depositional patterns and stratigraphic
evolution in avulsion-dominated, unconfined, deep-marine basin-floor systems by Viktor Terlaky and
Robert William Charles Arnott
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