| Abstract: | The Idono Complex is a fault-bounded, ~300 km2 fragment of Early Proterozoic continental crust surrounded by overlap assemblages and younger terranes accreted in Mesozoic time. It is composed of granitic to dioritic orthogneiss, amphibolite, and metasedimentary rocks. Trace element compositions of the granitoids and amphibolite suggest rock formation in a subduction-related volcanic arc terrain. Nine zircon fractions from three samples of granitoid orthogneiss define a U-Pb discordia line intersecting concordia at 2062 ?? 7 Ma and 182 ?? 8 Ma. The upper and lower intercepts are interpreted, respectively, as approximations of the time of granitoid crystallization and major episodic Pb-loss. Rocks of the Idono Complex may provide important insights into both Early Proterozoic evolution along the craton margin, and subsequent displacements. -from Authors |
| Genre: | Article |
| ProdID: | 70016623 |
| Citation Author: | Miller, M. L.; Bradshaw, J. Y.; Kimbrough, D. L.; Stern, T. W.; Bundtzen, T. K. |
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| Citation End Page: | 223 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geology |
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| Citation Number Of Pages: | 15 |
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| Citation Search Results Text: | Isotopic evidence for early Proterozoic age of the Idono Complex, west-central Alaska; 1991; Article; Journal; Journal of Geology; Miller, M. L.; Bradshaw, J. Y.; Kimbrough, D. L.; Stern, T. W.; Bundtzen, T. K. |
| Citation Start Page: | 209 |
| Citation Volume: | 99 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Isotopic evidence for early Proterozoic age of the Idono Complex, west-central Alaska; 1991; Article; Journal; Journal of Geology; Miller, M. L.; Bradshaw, J. Y.; Kimbrough, D. L.; Stern, T. W.; Bundtzen, T. K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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