| Abstract: | The Early Proterozoic geologic evolution of the region, as defined by characteristics of its supracrustal rocks, granitoids, metamorphism, structural history, and Pb and Nd isotopic signature, contrasts sharply with other Proterozoic provinces of the southwestern US. The oldest supracrustal rocks contain zircons over 2.0 Ga, corroborating Nd isotopic evidence for a much older crust here. Granitoids widely emplaced within these supracrustal rocks range from 1.76 to 1.64 Ga. The earlier plutons and surrounding supracrustal rocks were metamorphosed to granulite and high amphibolite facies throughout the province at about 1705 Ma in a migmatite-producing event that we term (informally) the Ivanpah orogeny. Subsequent granitoids, emplaced from 1.69 to 1.67 Ga, were voluminous along a north trending belt in the middle of the Mojave province. Younger plutons were emplaced at about 1.66 Ga in several places and at about 1.64 Ga along the extreme southern part of the province. -from Authors |
| Genre: | Article |
| ProdID: | 70016090 |
| Citation Author: | Wooden, J. L.; Miller, D. M. |
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| Citation Issue: | B12 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geophysical Research |
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| Citation Search Results Text: | Chronologic and isotopic framework for early Proterozoic crustal evolution in the eastern Mojave Desert region, SE California; 1990; Article; Journal; Journal of Geophysical Research; Wooden, J. L.; Miller, D. M. |
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| Citation Volume: | 95 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Chronologic and isotopic framework for early Proterozoic crustal evolution in the eastern Mojave Desert region, SE California; 1990; Article; Journal; Journal of Geophysical Research; Wooden, J. L.; Miller, D. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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