Tuesday, April 21, 2009

Quaker Run mylonite

A little follow-up to this morning's post of pictures from the Garth Run high-strain zone. A short distance away is the Quaker Run high-strain zone, which I visited in spring of 2003 with my geology graduate advisor, Dazhi Jiang, and two other structure students from the University of Maryland, College Park. Here's a beautiful sample of the mylonite I collected then:


The sample is cut and polished. The maximum dimensions of the sample are ~15.0 cm (+ or - 2 mm). Particularly striking is the large amount of epidote in the sample and the alignment of the feldspar porphyroclasts along the plane of foliation. Some have been bookshelfed and boudinaged, too.

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