Figure F88. Low-temperature crystal-plastic and semi-brittle microstructures. Scale bars are 2 mm. A. The large pyroxene porphyroclast has a tail of small recrystallized pyroxene grains + am-phiboles (1). An elongated plagioclase ribbon (2) is surrounded by a fine-grained recrystallized plagioclase matrix. In the latter, the finest grained zones are semi-brittle shear zones rich in amphibole. Sample 176-735B-92R-1 (Piece 3A, 12-15 cm). B. Localized semi-brittle shear zone (shown by the arrow), with a very fine grained size, overprinting a previously localized high--temperature shear zone (fine-grained recrystallized matrix). Sample 176-735B-95R-1 (Piece 8, 123-125 cm). C. Localized anastomosing shear zones, with Fe-Ti oxides and small, recrystallized plagioclase grains, wrapping around deformed plagioclase porphyroclasts. Sample 176-735B-90R-4 (Piece 4B, 112-116 cm). D. Close-up of (C), showing the fine-grained Fe-Ti oxide-plagioclase matrix around plagioclase porphyroclasts. Deformation in the plagioclase porphyroclasts is semi-brittle (undulose extinction, recrystallization, and microcracks). The arrow shows an area where oxides appear to cut the recrystallized mantle of the plagioclase porphyroclast and fill the crack in the same plagioclase. Sample 176-735B-90R-4 (Piece 4B, 112-116 cm). (Continued on next page.)