Figure F29. Plagioclase phenocrysts from the lower sequence of Hole 1189B are typically fresh and rounded. This group of fresh crystals are typical, with only slight clay alteration along the cracks. Fresh plagioclase microlites lie within altered groundmass. The granular texture in this photomicrograph is caused solely by a rough polish of the underlying glass side, not alteration (Sample 193-1189B-16R-1 [Piece 2, 36-39 cm]; width of view = 2.75 mm). A. Photomicrograph in plane-polarized light (Photomicrograph ID# 1189B_70; thin section 136). B. Photomicrograph in cross-polarized light (Photomicrograph ID# 1189B

Figure F29. Plagioclase phenocrysts from the lower sequence of Hole 1189B are typically fresh and rounded. This group of fresh crystals are typical, with only slight clay alteration along the cracks. Fresh plagioclase microlites lie within altered groundmass. The granular texture in this photomicrograph is caused solely by a rough polish of the underlying glass side, not alteration (Sample 193-1189B-16R-1 [Piece 2, 36-39 cm]; width of view = 2.75 mm). A. Photomicrograph in plane-polarized light (Photomicrograph ID# 1189B_70; thin section 136). B. Photomicrograph in cross-polarized light (Photomicrograph ID# 1189B_71; thin section 136).