By: magic-gigapans
Image: Callan Bentley, Mid-Atlantic Geo-Image Collection
License: Creative Commons Non Commercial ⧉

Uploaded: 31 Mar 2020
Last Updated: 29 May 2020

2.74 gigapixels
60,868 x 45,016 pixels
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Striped Rock granite. Part of a Virginia Tech Master’s student's thesis. Crystallization dated at 695 Ma (U-Pb zircon; Odom and Fullagar, 1984). Part of the Crossnore plutonic-volcanic suite of the Blue Ridge Basement Complex, VA. Fine- to medium-grained equigranular, fluorite-, epidote-, and allanite bearing hornblende-biotite granite; locally weakly to moderately mylonitic (thought to be Late Proterozoic). All ductile deformation is cut by quartz-, chlorite- and stilpnomelane-filled cracks and extension gash arrays. I think most of the vein-fill in this sample will be chlorite. (Simpson and Kalaghan, 1989, Geology, 17, 2, 148-151) The sample location is a pavement outcrop that is (or was then) nearby Pine Mountain Church, Independence, VA. 36° 40’ 19” N; 81° 06’ 16” W From the structural geology teaching collection of Carol Simpson and Declan De Paor.