Figure F58. Foliated cataclasite (Thin Section 77; Sample 345-U1415J-21R-1, 17–19 cm [Piece 4]). Plagioclase (Pl) grains become increasingly fractured toward the cataclastic zone (CC) and are highly fractured within the zone. B shows the fragments of plagioclase in the cataclasite are highly embayed and do not fit well together. This suggests that the chlorite surrounding these grains has replaced a substantial amount of plagioclase. Cpx = clinopyroxene, Am = amphibole, Pr = prehnite, Ph = phyllonite. A. Under crossed polars. B. Plane-polarized light.
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