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Abstract
Accommodation- versus supply-dominated systems for sediment partitioning to deep water
Highlights
Understanding the sediment supply mechanism and sediment distribution of deep-water systems is important for predicting and estimating hydrocarbon resources, deciphering past climatic and tectonic signals, and preventing geohazards
We explore the sediment distribution across numerically modeled shelf-margin clinoforms to (1) compare the efficiency of accommodation- and supply-dominated sediment dispersal systems; (2) understand how upstream and downstream boundary conditions can influence the formation of deep-water fans and continental margin building; and (3) learn how to quantitatively distinguish between these two systems
Even though this is true for a single eustatic cycle (~101–102 k.y.), our results suggest that the influence of the frequency of sea-level change is minor on the long-term deep-water sediment proportion, because the cumulative time for the shoreline to stay below the shelf edge at the million-year time scale is similar despite varying frequencies of sealevel change
Summary
Understanding the sediment supply mechanism and sediment distribution of deep-water systems is important for predicting and estimating hydrocarbon resources, deciphering past climatic and tectonic signals, and preventing geohazards. In the supply-dominated system, the deep-water sediment proportion decreases with increasing shelf width and amplitude of sea-level change Previous studies argued that longer cycle duration would allow more time for the shoreline to remain at the shelf edge (Porębski and Steel, 2003; Sømme et al, 2009; Zhang et al, 2017) Even though this is true for a single eustatic cycle (~101–102 k.y.), our results suggest that the influence of the frequency of sea-level change is minor on the long-term deep-water sediment proportion, because the cumulative time for the shoreline to stay below the shelf edge at the million-year time scale is similar despite varying frequencies of sealevel change (see Harris et al, 2018). The SASRs of eight clinothems of greenhouse Maastrichtian Washakie Basin (Wyoming, United States) are
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