U-Th dating of single zircons from young granitoid xenoliths: new tools for understanding volcanic processes

Details U-Th dating of single zircons from young granitoid xenoliths: new tools for understanding volcanic processes U-Th dating of single zircons from young granitoid xenoliths: new tools for understanding volcanic processes

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000e%26psl.183..291l&link_type=abstract

Earth and Planetary Science Letters, Volume 183, Issue 1-2, p. 291-302.

Computer Science

13

Scientific paper

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.

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