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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A110 (1982)

First Page: 413

Last Page: 439

Book Title: M 34: Studies in Continental Margin Geology

Article/Chapter: Arc, Forearc, and Trench Sedimentation and Tectonics; Amlia Corridor of the Aleutian Ridge: Convergent Margins: Field Investigations of Margin Structure and Stratigraphy

Subject Group: Geologic History and Areal Geology

Spec. Pub. Type: Memoir

Pub. Year: 1982

Author(s): D. W. Scholl, T. L. Vallier, A. J. Stevenson

Abstract:

A broad spectrum of geological and geophysical information has recently been collected within the Amlia corridor (173°W longitude) of the Aleutian Ridge. The ridge's upper crustal rocks can be divided into three rock series: lower, middle, and upper. The Aleutian Ridge is fundamentally a massive, little deformed antiform of lower series rocks produced by voluminous submarine volcanism in Eocene and perhaps earlier Tertiary time. Erosional debris from the dying arc accumulated over its flanks as the middle and upper series deposits of Oligocene through Holocene age; these deposits are as much as 4 to 5 km thick. A slightly deformed mass of tectonically thickened trench deposits underlies the lower part of the trench's landward slope. This accretionary wedge was added in post-middle Miocene time to the ridge's igneous framework of lower series rocks.

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