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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...

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