Figure F3. Occurrence of the high-temperature microscopic veins (HTMV). A. Photomicrograph of a high-temperature microscopic vein penetrating magmatic grains of olivine (Ol) and plagioclase (Plag) in olivine gabbro (Sample 176-735B-101R-1 [Piece 7, 106-108 cm]; cross-polarized light; field of view = 3.2 mm). See also Figure F2B, , for location of the vein. (Continued on next page.)

Figure F3. Occurrence of the high-temperature microscopic veins (HTMV). A. Photomicrograph of a high-temperature microscopic vein penetrating magmatic grains of olivine (Ol) and plagioclase (Plag) in olivine gabbro (Sample 176-735B-101R-1 [Piece 7, 106-108 cm]; cross-polarized light; field of view = 3.2 mm). See also Figure F2B for location of the vein. B. Mg compositional map. (Continued on next page.)