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Tuesday, April 24 • 12:00pm - 1:30pm
The Beaucatcher Road Cut, Asheville, NC: New Constraints On Shearing Within The Ashe Metamorphic Suite

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The Ashe Metamorphic Suite (AMS), composed of schist, gneiss, and amphibolite is found in the Blue Ridge Mountains and was thrust onto ~1 Ga Grenville basement gneiss during the Ordovician Taconic orogeny. The Taconic was followed by strike-slip faulting during the Silurian-Devonian Acadian orogeny and then thrusting during the Paleozoic Alleghanian orogeny. The Beaucatcher Cut is located along Interstate 240 in Asheville, North Carolina and exposes the AMS which exhibits abundant deformation. The cut provides a detailed view of the rock layers and folds in the AMS, within an undocumented shear zone within the interior of a large scale fold that contains many shear sense indicators. Detailed field mapping and interpretation of shear sense recorded in the rocks were combined to evaluate which orogeny the shearing relates to. The strike is consistently northeast and the dip varies throughout the cut. On the east, the dip is 24° east and progresses to vertical toward the west. The plunge of the mineral stretching lineation also varies throughout the cut, most are greater than 12° towards the northwest indicating mostly thrust motion. Three of the samples were right lateral, or dextral, which indicates a strike-slip fault, while five samples indicated a thrust fault along with dextral movement. The Beaucatcher Cut most likely supports the Taconic Orogeny due to the majority of the lineations plunging more than 20°, which is not documented with Acadian deformation. Alleghanian thrusting has been recorded at temperatures of


Tuesday April 24, 2018 12:00pm - 1:30pm PDT
Sherrill Center Concourse

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