Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 183, Issue 1-2, Pages 291-302Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0012-821X(00)00273-9
Keywords
zircon; U-238/Th-230; geochronology; ion probe data; SHRIMP data; Medicine Lake; California; granites xenolith
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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, similar to 25 and similar to 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.
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