| Abstract: | The Skagit Gneiss Complex forms a more-or-less continuous terrane within the North Cascade Range. The complex comprises abundant plutons intruded at mid-crustal depths into a variety of metamorphosed supracrustal rocks of both oceanic and volcanic-arc origin. U-Pb zircon ages from gneissis plutons within and near the Skagit Gneiss Complex indicate magmatic crystallziations between 75 and 60 Ma. Deformation, recrystallization, and migmatization in part postdate intrusion of the 75-60 Ma plutons. This latest Cretaceous and earliest Tertiary plutonism and migmatization may reflect thermal relaxation following early Late Cretaceous orogeny. The complex was ductilely extended northwest-southeast shortly after intrusion of granite dikes at ~45 Ma, but before emplacement of the earliest (~34 Ma) plutons of the Cascade arc. -from Authors |
| Genre: | Article |
| ProdID: | 70015002 |
| Citation Author: | Haugerud, R. A.; Van Der Heyden, P.; Tabor, R. W.; Stacey, J. S.; Zartman, R. E. |
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| Citation End Page: | 1307 |
| Citation Issue: | 10 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geological Society of America Bulletin |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Late Cretaceous and early Tertiary plutonism and deformation in the Skagit Gneiss Complex, north Cascade Range, Washington and British Columbia; 1991; Article; Journal; Geological Society of America Bulletin; Haugerud, R. A.; Van Der Heyden, P.; Tabor, R. W.; Stacey, J. S.; Zartman, R. E. |
| Citation Start Page: | 1297 |
| Citation Volume: | 103 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Late Cretaceous and early Tertiary plutonism and deformation in the Skagit Gneiss Complex, north Cascade Range, Washington and British Columbia; 1991; Article; Journal; Geological Society of America Bulletin; Haugerud, R. A.; Van Der Heyden, P.; Tabor, R. W.; Stacey, J. S.; Zartman, R. E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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