Fluid-controlled grain boundary migration and switch in slip systems in a high strain, high temperature contact aureole, California, USA.pdfVIP

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Fluid-controlled grain boundary migration and switch in slip systems in a high strain, high temperature contact aureole, California, USA.pdf

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Fluid-controlled grain boundary migration and switch in slip systems in a high strain, high temperature contact aureole, California, USA.pdf

Tectonophysics 676 (2016) 42–55 Contents lists available at ScienceDirect Tectonophysics journal homepage: /locate/tecto Fluid-controlled grain boundary migration and switch in slip systems in a high strain, high temperature contact aureole, California, USA Sven S. Morgan a,?, Peter I. Nabelek b, James Student a, Joseph F. Sadorski a a Department of Earth Atmospheric Sciences, Central Michigan University, Mt. Pleasant, MI 48859, USA b Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA article info Article history: Received 16 March 2015 Received in revised form 21 January 2016 Accepted 25 February 2016 Available online 10 March 2016 Keywords: Contact aureole deformation Crystallographic preferred orientation Grain boundary migration Oxygen isotope Fluids Water fugacity abstract Within the highly strained aureole surrounding the Eureka Valley–Joshua Flat–Beer Creek (EJB) composite pluton of eastern California, an inversion in microstructures and crystallographic preferred orientations (CPOs) exists with distance from the contact. An inner aureole (b250 m from the contact) consists of quartzites that are interbedded with marbles and calc-silicates. These quartzites are incompletely recrystallized. Most grain boundaries have migrated, although it is clear that grain boundary migration (GBM) is not extensive. Multiple data sets indicate that temperatures of deformation were above 650 °C. CPOs are indicative of b aN slip in quartz. Within the outer aureole (250 m to 1500 m from the contact), quartzites are interbedded with pelitic schist and are completely recrystallized and microstructures are indicative of extensive GBM. CPOs are indicative of prism [c] slip. Oxygen isotope ratios in the inner aureole are only slightly shifted from their original values. Oxygen isotopes from the outer aureole are shifted more, which is consistent with equilibration with locally derived ?uids. We suggest that recrystallization in the outer aureole was ai