A NEW LOOK AT THE BAKERSVILLE INTRUSIVE SUITE: IMPLICATIONS FOR DELINEATING STRUCTURAL BOUNDARIES WITHIN THE BLUE RIDGE THRUST COMPLEX
Previous work suggests that a thrust fault within the Fries thrust sheet, the Cox Creek fault, separates high grade dikes in the hanging wall from lower grade dikes in the footwall. In the upper part of the Fries, interpreted as the hanging wall of the Cox Creek fault, assemblages are characterized by abundant garnet, hornblende, and plagioclase with minor biotite. Structurally lower within the Fries thrust sheet (footwall of the Cox Creek fault) assemblages are dominated by abundant biotite, hornblende, and plagioclase; garnet is rare to absent. There is a notable difference in metamorphic assemblages between dikes contained within the Fries thrust sheet and the underlying thrust sheets. Dikes within both the Fork Ridge and Linville Falls-Stone Mountain-Unaka Mountain thrust sheets exhibit typical greenschist-facies metamorphic assemblages. Differences in metamorphic assemblages are evident across known thrust sheet boundaries and also within the Fries thrust sheet. Our data support the hypothesis that the Cox Creek fault separates higher grade dikes from lower grade dikes.