Abstract

Geochemistry and Petrogenesis of the Bonanza King Mafic Intrusive Complex, Trinity Terrane Ophiolite, California by Keith R. Wiltse Dr. Rodney V. Metcalf, Examination Committee Chair Professor of Geology University ofNevada, Las Vegas The Bonanza King mafic intrusive complex (MIC) (>25 km) of the Trinity terrane ophiolite, northern California, consists of cogenetic plutonic and dike lithologies. Steep intrusive contacts exist between cumulate pyroxenite, isotropic gabbro, and peridotite country rock. Near vertical east-west trending, bimodal dikes intruded gabbro and are centered within the complex. Geochemical modeling indicates that accumulation/fractionation of a gabbroic parental magma produced lithologic trends of cumulate pyroxenite and fractionated gabbro and dike lithologies. Similarities between all lithologies suggest cogenetic formation of all the elements of the Bonanza King MlC during the Late Silurian ( 431 +/3) Parental magma for the Bonanza King MTC formed in an subduction-related tectonic setting by partial melting of a depleted mantle enriched by slab-derived fluids.

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