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Transverse tectonic boundaries near Kodiak Island, Alaska.

Geological Society of America Bulletin

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Abstract

Transverse tectonic boundaries exist at the NE and SW ends of the Kodiak islands, so that the Aleutian arc-trench system is longitudinally segmented in this area. Evidence for the transverse boundaries includes alignments of such geologic features as offset volcanic lineations, terminations of structural trends, and boundaries of discrete zones of earthquake aftershock sequences. The boundaries appear to be broad zones of disruption that began to form during the late Miocene or Pliocene. Although oceanic fracture zones and seamount chains intersect the continental margin near the boundaries, subduction of these features probably did not cause the tectonic boundaries. The fracture zones and seamount chains have swept northeastward along the margin, at least since the late Pliocene, because of the direction of convergence of the Pacific and N American plates. -Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Transverse tectonic boundaries near Kodiak Island, Alaska.
Series title:
Geological Society of America Bulletin
Volume
92
Issue:
1
Year Published:
1981
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Society of America Bulletin
First page:
10
Last page:
18