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Evolving subduction zones in the Western United States, as interpreted from igneous rocks

Science

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Abstract

Variations in the ratio of K2O to SiO4 in andesitic rocks suggest early and middle Cenozoic subduction beneath the western United States along two subparallel imbricate zones dipping about 20 degrees eastward. The western zone emerged at the continental margin, but the eastern zone was entirely beneath the continental plate. Mesozoic subduction apparently occurred along a single steeper zone.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Evolving subduction zones in the Western United States, as interpreted from igneous rocks
Series title:
Science
Volume
174
Issue:
4011
Year Published:
1971
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
821
Last page:
825
Number of Pages:
5