Fig. 5
From: Peridotites with back-arc basin affinity exposed at the southwestern tip of the Mariana forearc
Photomicrographs of 139°E Ridge peridotites under cross-polarized light. The long side of each photomicrograph is parallel to the lineation. a Coarse-grained texture showing interlobate olivine. b Coarse-grained texture with irregularly shaped orthopyroxene (Opx). c Heterogeneous texture showing coarse olivine grains with undulose extinction and kink bands. d Heterogeneous texture showing olivine grains with polygonal textures and triple junctions. Pl: plagioclase. e Fine-grained texture showing a larger olivine with serrated grain boundaries (Ol) that is elongate parallel to the lineation. f Fine-grained texture showing grain boundaries in an orthopyroxene porphyroclast. Pl: plagioclase that appears as altered phases as irregular diffuse dark brown patches of hydrogrossular