Papoose Flat, Eureka Valley–Joshua Flat–Beer Creek, and Sage Hen Flat plutons: Examples of rising, sinking, and cookie-cutter plutons in the central White–Inyo Range,eastern California
Published:January 01, 2000
Sven S. Morgan, Richard D. Law, Michel de Saint Blanquat, 2000. "Papoose Flat, Eureka Valley–Joshua Flat–Beer Creek, and Sage Hen Flat plutons: Examples of rising, sinking, and cookie-cutter plutons in the central White–Inyo Range,eastern California", Great Basin and Sierra Nevada, David R. Lageson, Stephen G. Peters, Mary M. Lahren
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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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Great Basin and Sierra Nevada, the second volume of the Geological Society of America Field Guide Series, focuses on the dynamic and spectacular geology of this region, providing the inspiring backdrop for the 2000 GSA Annual Meeting in Reno. This volume gives complete coverage of field trips held in conjunction with that meeting, and contains 20 chapters organized into three sections. The first section consists of 16 chapters arranged in geochronological order, beginning with the active tectonics of Lake Tahoe and the historical surface faulting and paleoseismicity of the central Nevada seismic belt, and ending with the Neoproterozoic glacial record of Death Valley. In between are chapters dealing with Basin and Range extension, Eocene magmatism, Mesozoic plutonism in the Sierra Nevada, Paleozoic subduction, and Ordovician stratigraphy, to name a few. The second section covers the geology of the Nevada Test Site and the nuclear-waste repository at Yucca Mountain. The last section is an invited field guide from the 1999 GSA Cordilleran Section meeting that covers the wines and geology of Napa Valley, California. Overall, Great Basin and Sierra Nevada is a comprehensive compilation of new and exciting research on this amazingly diverse region, with well-crafted guides to field localities of special interest. Full-color plates in some chapters make this guide an especially appealing and useful volume.