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The Geysers-Cobb Mountain magma System, California (Part 2): Timescales of pluton emplacement and implications for its thermal history

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


Over 400 ion microprobe U-Pb isotopic ages measured for zircons extracted from 24 geothermal wells that penetrate the Geysers Plutonic complex (GPC) allow us to conclude that the entire known extent of the GPC crystallized during the early Pleistocene. Nine samples of the microgranite porphyry that forms the shallow cupola (100-1,500 m below sea-level, mbsl) of the GPC yield the oldest model U-Pb age (1.75 ± 0.01 Ma after correction for initial U series disequilibrium; errors 1σ). Twelve...[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/S0016-7037(03)00126-1


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