Astoria Fan, Pacific Ocean

  • C. Hans Nelson
Part of the Frontiers in Sedimentary Geology book series (SEDIMENTARY)


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.


Clay Sedimentation Shale Drilling Silt 


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© Springer-Verlag New York, Inc 1985

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  • C. Hans Nelson

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