Figure F11. Troctolitic olivine gabbro with radial cracks in plagioclase (Pl). A, B. Radial cracks interpreted as resulting from the apparent volume increase associated with serpentinization (Serp) of olivine (Ol) (Thin Section 21; Sample 345-U1415I-4R-1, 35–38 cm) C, D. Radial cracks interpreted as resulting from corona formation; olivine is replaced by tremolite (Tr) and chlorite (Chl) (Thin Section 14; Sample 345-U1415I-2R-1, 51–53 cm [Piece 11]). A and C are under plane-polarized light; B and D are under crossed polars.
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