Abstract
The Astoria Fan, a modern system, is located on a subducting oceanic crust and fills a north-south-trending trench along the Oregon continental margin. Well-developed channels cross the entire fan length; they display classic inner-fan leveed profiles but evolve into distributaries in the midfan area where the gradient decreases sharply. During periods of low sea level, inner- and middle-fan channels funnel sand to distal depositional sites in the outer-fan area where the sand/shale ratios are highest. This pattern of sand displacement and efficiency of transport appears to be characteristic of elongate fans fed by a major river and submarine canyon.
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References
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Nelson, C.H. (1985). Astoria Fan, Pacific Ocean. In: Bouma, A.H., Normark, W.R., Barnes, N.E. (eds) Submarine Fans and Related Turbidite Systems. Frontiers in Sedimentary Geology. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-5114-9_8
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DOI: https://doi.org/10.1007/978-1-4612-5114-9_8
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