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Pre-Cenozoic plutonic rocks in mainland Alaska

By
Thomas P. Miller
Thomas P. Miller
U.S. Geological Survey, 4200 University Drive, Anchorage, Alaska 99508–4667
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Published:
January 01, 1994

Abstract

Studies during the past decade have revealed that much of Alaska consists of a collection of generally far-traveled tectonostratigraphic terranes, most of which were transported to their present locations and accreted to North America in late Mesozoic to early Tertiary time (Jones and others, 1984; Silberling and others, this volume). This collage results in the exceedingly complex geologic and tectonic framework that constitutes much of present-day Alaska.

Magmatic activity in Alaska was influenced by a host of factors, including many involving plate interactions, such as the rate of subduction, the angle of dip, the motion of individual plates, and the composition, thickness, and age of material that was subducted beneath or collided with Alaska. The identification and interpretation of magmatic patterns as reflected by time of intrusion, areal distribution, and composition can therefore contribute to an understanding of the tectonic history of Alaska.

The following overview focuses on plutonic rocks in mainland (excludes southeastern) Alaska emplaced from the Proterozoic into the earliest Tertiary. Plutonic rocks and belts emplaced during a specific time frame (e.g., the Early Cretaceous) are not necessarily everywhere related in terms of genesis or tectonic setting, and some related rocks may be shown in different temporal episodes. Postplutonic terrane movement and Cenozoic strike-slip faulting with large displacements have further complicated the identification and interpretation of plutonic events and patterns. Rocks assigned to specific plutonic belts are assumed to be cogenetic regardless of the mechanism of formation. The informal name given to a temporal episode of intrusive activity

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DNAG, Geology of North America

The Geology of Alaska

George Plafker
George Plafker
U.S. Geological Survey MS 904, 345 Middlefield Road Menlo Park, California 94025
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Henry C. Berg
Henry C. Berg
115 Malvern Avenue Fullerton, California 92632
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Geological Society of America
Volume
G-1
ISBN electronic:
9780813754536
Publication date:
January 01, 1994

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