Figure F20. Variation in magmatic foliation strength from strong to moderate, weak, and isotropic (under crossed polars). Red arrows = orientation of foliation. A. Strong magmatic foliation in olivine gabbro defined by shape-preferred orientation (SPO) of plagioclase, olivine, and clinopyroxene (Sample 345-U1415I-4R-1, 35–38 cm [Piece 6]). B. Moderate magmatic foliation in olivine-bearing gabbronorite defined by SPO of plagioclase, olivine, and clinopyroxene (Sample 345-U1415I-4R-1, 48–50 cm [Piece 8A]). C. Weak magmatic foliation in gabbro defined by plagioclase SPO (Sample 345-U1415I-4R-1, 136–139 cm [Piece 12]). D. Isotropic magmatic foliation in olivine gabbro (Sample 345-U1415I-3R-4, 16–19 cm [Piece 2]).
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