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Trench-fill submarine-fan facies associations of the Upper Cretaceous Chugach terrane, southern Alaska

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Abstract

Turbidites of the Upper Cretaceous Chugach terrane of southern Alaska were deposited in a trench during northward-directed subduction. The fault-bounded outcrop belt of the Chugach terrane is about 2000-km long and 100-km wide and was accreted to Alaska during the Cenozoic. Turbidites are at least 5000 m thick, are extensively deformed, have been regionally metamorphosed, and have been intruded by anatectic granites. Facies associations indicate an east-to-west progression from inner-fan to middle-fan, outer-fan, fan-fringe, and basin-plain deposits. To the north is a marginal trench-slope facies association and a basin.

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  1. U.S. Geological Survey, 345 Middlefield Road, 94025, Menlo Park, CA

    Tor H. Nilsen

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  1. Tor H. Nilsen
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Nilsen, T.H. Trench-fill submarine-fan facies associations of the Upper Cretaceous Chugach terrane, southern Alaska. Geo-Marine Letters 3, 179–185 (1983). https://doi.org/10.1007/BF02462465

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  • DOI: https://doi.org/10.1007/BF02462465

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