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Abstract

In the morning, we will drive to the northern Inyo Mountains to examine ductile deformation of wall rocks and other structures found at the margins of the EJB pluton (Fig. 35). In the afternoon, we will return to Crooked Creek in the White Mountains to examine the Sage Hen Flat pluton. Much of the guide for Day 5 was adapted and modified from Morgan et al. (1998b, 2000) and Nelson (1980).

The central White-Inyo range in eastern California (Figs. 35, 36) is an excellent area to study emplacement of both concordant plutons with deformed aureoles and discordant plutons because the plutons are well exposed at various structural levels, and because the wall rocks belong to a well-mapped sedimentary section (Fig. 37) that underwent regional shortening before the plutons were emplaced but has scarcely been deformed since. Stevens et al. (1997), Dunne et al. (1998) and Stockli et al. (2003) described the Phanerozoic geologic evolution of the eastcentral California region, and Morgan and Law (1998) summarized the regional deformation recorded in the central White-Inyo range.

The EJB composite pluton and the Sage Hen Flat pluton (Figs. 35, 36, 38) are similar in age but differ drastically in the amounts and styles of deformation at their margins. As we will see today, ductile strain is practically absent adjacent to the Sage Hen Flat pluton whereas the contact aureole of the EJB pluton underwent intense emplacement-related ductile deformation that has been interpreted to record outward and downward translation and tilting of sedimentary wall rocks. In addition to examining these contrasting emplacement styles, we will examine and consider the interpretation of magmatic and solid-state foliations related to pluton emplacement.

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