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Abstract

The central White-Inyo Range in eastern California has been an excellent field area to study concordant (deformed aureoles) and discordant, or “cookie cutter” plutons (see Nelson and Sylvester, 1971; Nelson et al., 1978; Sylvester et al, 1978a; Sylvester et al, 1978b; Paterson et al., 1991; Law et al., 1992, 1993; Bilodeau and Nelson, 1993; Morgan and Law, 1994; Morgan et al., 1998a and b, Saint Blanquat et al., in review), because: 1) the range is dominantly composed of a well-mapped sedimentary section where the dominant contractional regional deformation predates pluton emplacement, and 2) the plutons are well exposed at various structural levels. In this contribution, we present some of our work on three of the plutons in the range, the Eureka Valley-Joshua Flat-Beer Creek (EJB) composite pluton, the Sage Hen Flat pluton, and the Papoose Flat pluton. These three plutons exhibit drastic differences in the style and amount of deformation at their margins. Description and examination of the deformation (or lack of) at the margins of these plutons, which accommodated their emplacement, along with a characterization of the internal magmatic/solid state/magnetic foliations, are the foci of this paper and field trip.

Specifically, field trip participants will have the opportunity to observe the following; 1) Total lack of strain at a pluton contact (Sage Hen Flat pluton), 2) Intense strain at two pluton contacts related to emplacement (Papoose

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