whole-rock

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We report U-Pb crystallization ages for zircon grains and Ar-Ar whole-rock spectra for a hydrothermally altered granodiorite (31-17) at Medicine Lake Volcano, a half-million-year-old shield volcano of basalt through rhyolite composition.

U-Pb and Ar-Ar constraints on the age of granitic intrusions beneath Medicine Lake Volcano, California, USA 2000
All phases contain abundant secondary, water-rich fluid inclusions and the whole-rock d18O is -1.5 per mil. The

U-Pb and Ar-Ar constraints on the age of granitic intrusions beneath Medicine Lake Volcano, California, USA 2000
Temperature of the granitic magma, by whole-rock Zr geothermometry, was 875±25°C.

Granophyre.html 1998