Geo-Marine Letters

, Volume 3, Issue 2–4, pp 65–70 | Cite as

The Astoria Fan: An elongate type fan

  • C. Hans Nelson
Article

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.

Keywords

Turbidite Late Pleistocene Turbidity Current Submarine Canyon Piston Core 

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Copyright information

© Springer-Verlag New York Inc. 1984

Authors and Affiliations

  • C. Hans Nelson
    • 1
  1. 1.U.S. Geological SurveyMenlo Park

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