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Swiss Journal of Geosciences
Fig. 10 | Swiss Journal of Geosciences

Fig. 10

From: Microstructural characterization of natural fractures and faults in the Opalinus Clay: insights from a deep drilling campaign across central northern Switzerland

Fig. 10

Overview of optical light micrographs of cm-thick thrust faults showing multiple deformation by formation of veins, slickensides and micron-veinlets. a Thin section view of thrust fault constituted by fibrous veins, slickensides as well as micron-veinlets. b Zoom in on (a) shows slickensides and wiggly micron-veinlets that are bounded by the slickensides. a, b Includes sample BOZ2_1_482.70A. c Thin section view of thrust fault with blocky calcite vein and micron-veinlets bound by small slip planes. d Zoom in on (c) shows how the micron-veinlets, are sheared by thin slip planes. c, d includes sample BOZ2_1_507.70. e Results of WDS microprobe mapping of red area in (d) showing the different element distributions

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