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Figure F13. Boundary between gabbro and orthopyroxene (Opx)-bearing olivine (Ol) gabbro (red dashed lines) (Thin Section 127; Sample 345-U1415P-14R-1, 16–25.5 cm [Piece 3]). Boundary type = grain size and modal; boundary definition = sharp and sutured. For details see “Descriptions of igneous boundaries.” A. Core close-up. Blue box indicates the position of thin section in B and C. B. Plane-polarized light. Cpx = clinopyroxene, Pl = plagioclase. C. Under crossed polars.

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