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Sedimentary Sequences in the North Pacific Trenches

  • David W. Scholl

Abstract

The sedimentary rock sequences of north Pacific trenches are the generally undeformed deposits that lie immediately seaward of continental and insular slopes and that typically overlie a landward-dipping (1–5°) oceanic acoustic basement. The sediment-filled (1–2 km), and therefore bathymetrically unexpressed, Washington-Oregon Trench lies adjacent to the North American margin between northern California and Vancouver Island, British Columbia. This trench’s landward-dipping basement is conformably overlain by a hemiterrigenous sequence composed chiefly of distal turbidites, probably the downwarped terrigenous and less-abundant pelagic deposits of an abyssal plain, formed in late Miocene through early Pleistocene time. It is overlain by a terrigenous sequence of landward-thickening and flat-lying turbidites. Formed during the past 1.0 my, the turbidite wedge is a true axial trench deposit.

Keywords

Continental Slope Turbidity Current Abyssal Plain Terrigenous Sequence Structural Trench 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer Science+Business Media New York 1974

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  • David W. Scholl

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