Figure F39. A. Photograph of felsic dikes and veins that are common in Hole 1275B and may be present as well-defined dikelets or irregular, patchy domains (interval 209-1275B-18R-1, 54–69 cm). B. Photomicrograph of a felsic vein in which carbonate (ca) encloses numerous plagioclase grains. The rectangle shows the position of enlargement pictured in C (Sample 209-1275B-18R-1, 66–70 cm) (cross-polarized light: blue + dark gray filters; field of view = 2.75 mm; image 1275B_047). C. Enlargement of the area outlined by the rectangle in B. Carbonate appears to replace plagioclase. There are abundant fibrous needlelike crystals within the carbonate which could be apatite, tremolite, or zeolite (Sample 209-1275B-18R-1, 66–70 cm) (cross-polarized light: blue + light gray filters; field of view = 0.7 mm; image 1275B

Figure F39. A. Photograph of felsic dikes and veins that are common in Hole 1275B and may be present as well-defined dikelets or irregular, patchy domains (interval 209-1275B-18R-1, 54–69 cm). B. Photomicrograph of a felsic vein in which carbonate (ca) encloses numerous plagioclase grains. The rectangle shows the position of enlargement pictured in C (Sample 209-1275B-18R-1, 66–70 cm) (cross-polarized light: blue + dark gray filters; field of view = 2.75 mm; image 1275B_047). C. Enlargement of the area outlined by the rectangle in B. Carbonate appears to replace plagioclase. There are abundant fibrous needlelike crystals within the carbonate which could be apatite, tremolite, or zeolite (Sample 209-1275B-18R-1, 66–70 cm) (cross-polarized light: blue + light gray filters; field of view = 0.7 mm; image 1275B_048).