⁸⁷Sr/⁸⁶Sr and ¹⁸O/¹⁶O variations within a single intrusive unit of the Peninsular Ranges batholith, San Jacinto mountains, southern California

Abstract

The Peninsular Ranges batholith (PRB) of southern California and Baja California shows striking transverse asymmetries in many geochemical parameters (e.g. Early and Silver, 1973; Taylor and Silver, 1978; Silver et. al., 1979). Initial ⁸⁷Sr/⁸⁶Sr (Sr_i) generally becomes more radiogenic (0.703-0.708) and δ¹⁸o increases (6.0 to 12.8) from west to east (continentward), except in the San Jacinto - Santa Rosa Mtns block at the extreme northeast. Taylor and Silver (1978) suggested this anomalous region may be attributable to local involvement of the southwest edge of North American cratonic crystalline basement in the fusion process that produced these magmas.

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