Fig. 3From: Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zoneMicrostructures of the CMVs. a Photograph of the CMVs within thin sections. The highly reflective CMV is in white. b Sketch of (a). Dashed lines represent foliations. c Reflected-light photomicrograph of a CMV. d Plane-polarized-light photomicrograph of the CMV. a–c Close-ups of the CMVs from Fig. 2d, and (d) is a magnification of Fig. 2e Back to article page