Abstract
Petrographic, geochemical, and structural characteristics of the Target Range pluton, southern California, indicate that it is part of the system of gabbroic plutons that occupy the western margin of the Peninsular Ranges batholith. Modal variations within the pluton range from olivine-orthopyroxene gabbronorite to amphibole-biotite quartz diorite. Field evidence combined with Rayleigh fractionation models for the distribution of Sr, Ba, K, and Rb indicate that assimilation of prebatholithic granitic rocks is the main factor in producing the observed assemblages. Other reported dioritic plutons within the Peninsular Ranges batholith have petrographic and trace element characteristics similar to the study area and may also represent contaminated gabbroic melts. The trace element distributions appear to preclude the origin of the granitic components of the batholith by fractional crystallization of a parental gabbroic melt.
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