Figure F52. Cataclasite (under crossed polars). A. Cataclastic gabbro with two domains (Thin Section 64; Sample 345-U1415J-12R-1, 115–117 cm [Piece 15]). Domain 1 (D1) is cataclasite with abundant prehnite clasts, some relatively coarse grained, and Domain 2 (D2) is a chlorite (Chl)-rich shear zone, chlorite after olivine, and extensively prehnitized plagioclase (Pl). Detail for S1 is given in B; for S2, see Figure F59. B. Cataclastic sample with chlorite rim developing between serpentine after olivine (Se) and prehnitized plagioclase. Few relics of plagioclase remain. C. Chlorite replacing olivine or phases after olivine in cataclasite with basaltic dike rock fragment (Thin Section 74; Sample 345-U1415J-19R-1, 64–67 cm [Piece 10]). D. Chlorite replacing plagioclase and pyroxene. Pyroxene is also partially replaced by amphibole (Am). Cpx = clinopyroxene, SPl = secondary plagioclase.
Previous | Close | Next | Top of page