2012 GSA Annual Meeting in Charlotte
403 Thursday, 1 November 2012
5:00 PM-5:05 PM, Charlotte Convention Center: Concourse C, MLK Jr Blvd. Entrance

The Neoacadian Orogenic Core of the Southern Appalachians: A Geo-Traverse Through the Migmatitic Inner Piedmont From the Brushy Mountains to Lincolnton, North Carolina

Primary Leader: Arthur J. Merschat
Leader(s): Robert D. Hatcher Jr, Heather E. Byars, William Gilliam
Field Trip Description: This two-day field trip through the NC Piedmont, located a few hours northwest of Charlotte, highlights some of the most significant recent developments in southern Appalachian geology: recognition of the sillimanite grade, mixed Laurentian and peri-Gondwanan affinity, Siluro-Devonian metasedimentary Cat Square terrane in the Inner Piedmont (IP). Siluro-Devonian rocks in the interior southern Appalachians have fundamental implications. Consistent with field observations and geochronology, we have hypothesized that the Carolina superterrane collided obliquely with Laurentia during the Devonian near the Pennsylvanian embayment, overrode the Cat Square terrane and Laurentian margin, and squeezed the IP out to the west and southwest, buttressing against the Brevard fault zone. The objective of this field trip is to examine the key attributes of the Cat Square terrane in a NW–to–SE traverse across the NC IP. We will compare Tugaloo and Cat Square terrane lithostratigraphies, examine mylonites of the Brindle Creek fault, Devonian-Mississippian plutonism and metamorphism in the IP, and the Newton window. Day 1 will begin near Lenoir in the western IP to examine Tugaloo terrane rocks, followed by a traverse across the Brindle Creek fault, and then into the core of the Cat Square terrane to examine relationships between metamorphism, migmatites, and granitoids. Day 2 will focus on the eastern boundary of the Cat Square terrane, where the Brindle Creek fault frames the Newton window exposing the Tugaloo terrane. Exposures will include the Brindle Creek fault, the Vale charnockite xenolith in Walker Top Granite, and rocks inside the Newton window.
Field Trip will span: 2 days
Sponsor(s): GSA Structural Geology and Tectonics Division; USGS National Cooperative Geologic Mapping Program, EDMAP component;

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