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The Geysers - Cobb Mountain magma system, California (Part 1): U-Pb zircon ages of volcanic rocks, conditions of zircon crystallization and magma residence times

Schmitt, Axel K; Grove, Marty; Harrison, Timothy; Lovera, Oscar; Hulen, Jeffrey; Walters, Mark

Description

Combined U-Pb zircon and 40Ar/39Ar sanidine data from volcanic rocks within or adjacent to the Geysers geothermal reservoir constrain the timing of episodic eruption events and the pre-eruptive magma history. Zircon U-Pb concordia intercept model ages (corrected for initial 230Th disequilibrium) decrease as predicted from stratigraphic and regional relationships (1 σ analytical error): 2.47 ± 0.04 Ma (rhyolite of Pine Mountain), 1.38 ± 0.01 Ma (rhyolite of Alder Creek), 1.33 ± 0.04 Ma...[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
URI: http://hdl.handle.net/1885/88435
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/S0016-7037(03)00140-6

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