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SSA could not be possible without the generous support of Drs. Herbert A. and Betty Lou Lubs and the Science, Society, and the Arts Research Conference Endowment. We are deeply grateful!
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Friday, March 17 • 3:00pm - 4:15pm
Easel 73: 3D Strain from Rutilated Quartz and its Relationship to Quartz Crystallographic Preferred Orientations

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Strain analysis can assess variations in deformation along the strike of a mountain belt, while deformed rutile inclusions in quartz can be used to quantify the three-dimensional strain within a rock. We have studied rutile inclusions within quartz from samples of the Antietam Formation, an Early Cambrian orthoquartzite in the Blue Ridge of central VA. Both prolate and oblate strain shapes are observed, while maximum stretch values vary from 1.2 to 1.6. The 3D strain solutions are used to orient quartz crystallographic preferred orientation (CPO) data collected through electron backscatter diffraction. Usually, CPO results are interpreted with respect to the macroscopic foliation and lineation directions; however, these features are generally lacking in hand samples of the Antietam. When aligned parallel to the principal directions determined from the strain analysis, the quartz CPO data show coaxial deformation with small circles oriented around the maximum shortening direction.


Friday March 17, 2017 3:00pm - 4:15pm
Leyburn Library