Arc, Forearc, and Trench Sedimentation and Tectonics; Amlia Corridor of the Aleutian Ridge
Published:January 01, 1982
D. W. Scholl, T. L. Vallier, A. J. Stevenson, 1982. "Arc, Forearc, and Trench Sedimentation and Tectonics; Amlia Corridor of the Aleutian Ridge", Studies in Continental Margin Geology, J. S. Watkins, C. L. Drake
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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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Studies in Continental Margin Geology
"Studies in Continental Margin Geology" contains papers from a research conference co-sponsored by AAPG and the University of Texas Institute for Geophysics held in Galveston, Texas in 1981. Rapid advances in the understanding of continental margin geology were taking place during the time period, based on major improvements in the quality and availability of regional seismic surveys plus other fields such as organic geochemistry. For the first time it was becoming common to have a visual characterization of tectonic processes at significant depths below the surface. Twenty-seven papers are presented that deal with field investigations of continental margin structure and stratigraphy. The geographic areas of study are global in nature and many of the descriptive results are derived from modern seismic investigations in areas where that type of data had not previously been available in commercial publications. Fifteen of the papers focus on rifted margins and the other twelve concern convergent margins. Twelve papers are model investigations of a variety of margin environmental processes, related to subjects such as depositional environments, biostratigraphy, organic matter deposition, and oil and gas occurrences as a function of the plate tectonic setting. An additional nine papers model the thermal and mechanical tectonic processes involved in the structural development along continental margins.