| Abstract: | Multiple U-Th isotopic analyses of individual zircon crystals by ion microprobe define isochrons that discriminate between different crystallization ages of granitoid xenoliths in lavas erupted 1065 and 2000 years ago from Medicine Lake volcano, CA, USA. Zircon ages indicate at least two intrusive episodes, ~ 25 and ~ 90 ka, at times when silicic volcanism was rare, but basaltic volcanism was prevalent. Ar-Ar spectra require that the granitoids were completely crystalline thousands of years prior to their mobilization and eruption. These techniques demonstrate that individual zircon crystals can form rapidly enough to provide unique U-Th ages, and allow dating of < 300 ka xenoliths from volcanic eruptions. (C) 2000 Elsevier Science B.V. All rights reserved. |
| Genre: | Article |
| ProdID: | 70022181 |
| Citation Author: | Lowenstern, J. B.; Persing, H. M.; Wooden, J. L.; Lanphere, M.; Donnelly-Nolan, J.; Grove, T. L. |
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| Citation End Page: | 302 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | U-Th dating of single zircons from young granitoid xenoliths: New tools for understanding volcanic processes; 2000; Article; Journal; Earth and Planetary Science Letters; Lowenstern, J. B.; Persing, H. M.; Wooden, J. L.; Lanphere, M.; Donnelly-Nolan, J.; Grove, T. L. |
| Citation Start Page: | 291 |
| Citation Volume: | 183 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | U-Th dating of single zircons from young granitoid xenoliths: New tools for understanding volcanic processes; 2000; Article; Journal; Earth and Planetary Science Letters; Lowenstern, J. B.; Persing, H. M.; Wooden, J. L.; Lanphere, M.; Donnelly-Nolan, J.; Grove, T. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0012-821X(00)00273-9 |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
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