Figure F18. Photomicrographs of multifilled veins from Hole U1362A basalt. A. Irregular iron oxyhydroxide vein (0.2 mm), with discontinuous sections of fibrous cross-vein saponite core, cutting through plagioclase phenocrysts (Sample 327-U1367A-13R-1 [Piece 15, 41–43 cm]) (FOV = 2.5 mm; plane-polarized light). B. Variable microvein (<0.1 mm) composition (left to right): saponite lining, saponite with iron oxyhydroxide core, iron oxyhydroxide only, and saponite only (Sample 327-U1367A-21R-1 [Piece 16, 104–106 cm]) (FOV = 2.5 mm; plane-polarized light). C. Microvein of saponite lining with interchangeable iron oxyhydroxide (top right) and saponite (bottom left) cores (Sample 327-U1367A-21R-1 [Piece 16, 104–106 cm]) (FOV = 2.5 mm; plane-polarized light).
Previous | Close | Next | Top of page