Figure F42. Photomicrographs of porphyroclastic gabbro mylonite entirely pseudomorphed by near-static secondary amphibole (Am). Cross-fiber secondary amphibole replacing clinopyroxene augen, demonstrating near-static replacement of the pyroxene. Slight inclination of the amphibole fibers to the foliation plane suggests continued postalteration deformation (Sample 209-1270-14R-1 [Piece 7, 32–35 cm]). A. Plane-polarized light: blue filter; field of view = 5.5 mm; image 1271B_115. B. Cross-polarized light: blue filter; field of view = 5.5 mm; image 1271B

Figure F42. Photomicrographs of porphyroclastic gabbro mylonite entirely pseudomorphed by near-static secondary amphibole (Am). Cross-fiber secondary amphibole replacing clinopyroxene augen, demonstrating near-static replacement of the pyroxene. Slight inclination of the amphibole fibers to the foliation plane suggests continued postalteration deformation (Sample 209-1271B-14R-1 [Piece 7, 32–35 cm]). A. Plane-polarized light: blue filter; field of view = 5.5 mm; image 1271B_115. B. Cross-polarized light: blue filter; field of view = 5.5 mm; image 1271B_116.