| Abstract: | Two late Archaean intrusive events were documented in the Wind River Range by isotopic studies of the Rb-Sr and U-Th-Pb systems in whole-rock samples and the U-Pb systematics for zircon. An age of approx 2630(20) m.y. for the Louis Lake batholith and apparent ages of 2504(40) to 2575(50) m.y. for the Bear Ears pluton were obtained. Post-magmatic hydrothermal events approximately Tertiary in age, lowered delta 18O values and disturbed parent-daughter relationships in most of the isotopic systems investigated. The two intrusive units apparently were derived from different protoliths. Initial isotopic ratios and petrochemistry for the Louis Lake batholith are consistent with an early Archaean trondhjemitic to tonalitic source. The protolith for the Bear Ears pluton must have been subjected to high-grade metamorphism that caused loss of Rb and U prior to magma generation. -L.C.H. |
| Genre: | Article |
| ProdID: | 70013022 |
| Citation Author: | Stuckless, J. S.; Hedge, C. E.; Worl, R. G.; Simmons, K. R.; Nkomo, I. T.; Wenner, D. B. |
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| Citation End Page: | 860 |
| Citation Issue: | 7 |
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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: | Isotopic studies of the late Archean plutonic rocks of the Wind River Range, Wyoming.; 1985; Article; Journal; Geological Society of America Bulletin; Stuckless, J. S.; Hedge, C. E.; Worl, R. G.; Simmons, K. R.; Nkomo, I. T.; Wenner, D. B. |
| Citation Start Page: | 850 |
| Citation Volume: | 96 |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | Isotopic studies of the late Archean plutonic rocks of the Wind River Range, Wyoming.; 1985; Article; Journal; Geological Society of America Bulletin; Stuckless, J. S.; Hedge, C. E.; Worl, R. G.; Simmons, K. R.; Nkomo, I. T.; Wenner, D. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1985 00:00 -0600 |
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