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The Clear Lake Volcanics (~2.1 to 0.01 Ma) are the youngest of a series of volcanic fields in the nothern Coast Ranges of California whose ages roughly parallel the timing of northerly migration of the Mendocino triple junction (Dickinson and Snyder, 1979; Johnson and O’Neil, 1984; Fox et al., 1985). There is compelling chemical, isotopic, and textural evidence that partial melting of crustal rocks played a major role in magmatism at Clear Lake (Futa et al.,1981; Hearn et al., 1981; Johnson and O’Neil, 1984). Physical evidence includes the presence of high-grade metamorphic xenoliths in many basaltic to andesitic lavas...

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