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Petrogenesis of the Barcroft pluton, northern White-Inyo Mountains, east-central California

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Abstract

The White-Inyo Range lies within the regional transition from Paleozoic-Precambrian North American continental basement to outboard Mesozoic and younger accreted terranes and a superimposed Andean-type arc. In the central White Mountains, the metaluminous Barcroft granodiorite invaded a major NE-striking, SE-dipping high-angle reverse fault—the Barcroft break. Because it is a relatively isolated igneous body and is well exposed over an elevation range of 1,500–4,000 m, its thermal history and that of the surrounding superjacent section are clearer than those of nearly coeval, crowded plutons emplaced in the hotter Sierra Nevada belt. The Barcroft pluton was emplaced as a compositionally heterogeneous series of areally scattered melt pulses episodically injected over the approximate interval 167–161 Ma. The oldest dated rocks are relatively quartzofeldspathic, whereas the youngest is more ferromagnesian, suggesting progressive partial fusion of a relatively mafic protolith. Heavy rare earth-enriched zircons indicate that Barcroft melts were derived at mid-crustal depths from a previously emplaced metabasaltic protolith containing plagioclase but lacking garnet. Granodioritic magma genesis involved the possible mixing of mafic and felsic melts, as well as very minor assimilation of country rocks, but mainly by fractional fusion and crystallization. Bulk chemical, rare earth, and isotopic data suggest that analyzed Barcroft rocks are members of a single suite. Granodioritic rocks are slightly more magnetite-rich at higher elevations on the NE, nearer the roof of the pluton. Earlier thermobarometry chronicled cooling and re-equilibration of the Barcroft pluton from its margins inward, as well as from mid-crustal generation depths of ~25 km through ascent and stalling at ~10–12 km. Refractory phase assemblages crystallized along the pluton margins, whereas subsolidus minerals in the interior of the of body continued to exchange with upper crustal deuteric and surficial aqueous fluids during exhumation and cooling.

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Acknowledgments

Over a 30-year period, Stanford University and the University of California, Los Angeles, provided geologic mapping and geochemical analytical support for my work in the White-Inyo Range. Access to the field area and accommodations were made available by the U. S. Forest Service and the University of California’s White Mountain Research Station, respectively. This paper represents the synthesis of published research results and new SHRIMP-RG age data. Uwe Martens and Chris Mattinson helped with the SIMS U–Pb data reduction. The draft manuscript was reviewed and improved by Allan Glazner, Rick Law, and Eric Ferré. Jade Star Lackay and Drew Coleman constructively criticized this paper for the journal. I am most grateful to these colleagues and institutions for support and helpful feedback.

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  1. Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305-2115, USA

    W. G. Ernst

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Communicated by T. L. Grove.

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Ernst, W.G. Petrogenesis of the Barcroft pluton, northern White-Inyo Mountains, east-central California. Contrib Mineral Petrol 165, 419–435 (2013). https://doi.org/10.1007/s00410-012-0815-8

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