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3-Dimensional Strain Analysis of Quartz Arenite in the Antietam Formation, Blue Ridge province, Virginia, USA
Knuth, Freidrich Alexander
Knuth, Freidrich Alexander
Abstract
The Antietam formation is a lower Cambrian quartz arenite, forming distinctive cliffs along the SW rim of the Virginian Appalachian mountains. The formation strikes in congruence with the general trend of the mountain range, app. 30° NE. The study site is about four miles SE of Harriston, VA, located in the Shenandoah National park. 19 samples have been collected thus far. Sample selection has been based of field data indicating local folds, limbs and overturned beds. I aim to illustrate and recollect the magnitudes and orientation of deformation across the folds using the 2-Dimensional Rf/® and Fry (center-to-center) methods applied to three perpendicular planes cut out of the sample rock. I have begun a 3-Dimensional strain analysis on a grain scale on 6 out of the 19 samples. My study indicates the Antietam underwent flattening strain with volume loss of up to 30%. Sample FK1 shows the elongation of the X-axis strikes generally NE to SW, in congruence with the general trend of the Blue Ridge.
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2008-01-01
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Geology