Figure F19. A. Close-up photograph of a 1-cm-wide xenolith of dunite in gabbroic material now replaced by amphibolite (interval 209-1271B-17R-1, 44.5–48 cm). B, C. Photomicrographs showing the reaction zone between xenolithic olivine and amphibolite at the contact between the xenolith in A (Sample 209-1271B-17R-1, 45–48 cm) (field of view = 5.5 mm); (B) ghosts of a symplectic mineral assemblage, now totally altered, are still recognizable (plane-polarized light: blue + light gray filters; image 1271B_085); (C) cross-polarized light: blue + light gray filters; image 1271B

Figure F19. A. Close-up photograph of a 1-cm-wide xenolith of dunite in gabbroic material now replaced by amphibolite (interval 209-1271B-17R-1, 44.5–48 cm). B, C. Photomicrographs showing the reaction zone between xenolithic olivine and amphibolite at the contact between the xenolith in A (Sample 209-1271B-17R-1, 45–48 cm) (field of view = 5.5 mm); (B) ghosts of a symplectic mineral assemblage, now totally altered, are still recognizable (plane-polarized light: blue + light gray filters; image 1271B_085); (C) cross-polarized light: blue + light gray filters; image 1271B_084).