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Geology; March 1993; v. 21; no. 3; p. 255-258; DOI: 10.1130/0091-7613(1993)021<0255:IACLAI>2.3.CO;2
© 1993 Geological Society of America
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Intra-arc crustal loading and its tectonic implications, North Cascades crystalline core, Washington and British Columbia

Robert B. Miller1, Edwin H. Brown2, Daniel P. McShane2 and Donna L. Whitney3

1 Department of Geology, San Jose State University, San Jose, California 95192-0102
2 Department of Geology, Western Washington University, Bellingham, Washington 98225
3 Department of Geology and Geography, Vassar College, Poughkeepsie, New York 12601

Widespread high-pressure Cretaceous metamorphism in the Coast Plutonic Complex of southeast Alaska and British Columbia and its southeast extension, the Cascades crystalline core, is commonly attributed to thrust loading during superterrane collision. However, terrane boundaries within the Cascades core are intruded by relatively shallow mid-Cretaceous plutons, and crustal loading of ~2-5 kbar postdates these plutons. These observations are not consistent with proposed collisional models, and we suggest that loading occurred by structural and/or plutonic processes operating within a magmatic arc. Such loading may be an important process in arc tectonics, although it has not been widely reported.




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