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Swiss Journal of Geosciences
Fig. 4 | Swiss Journal of Geosciences

Fig. 4

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

Fig. 4

Macro and microphotographs of mirror fault planes and fault zones. a, b Mirror-like fault planes with striated clay minerals. c Fault plane with striations and calcite slickenfibres. d Macroscopic photograph of a core including a several cm-wide fault zone (orange line). e Microscopic photograph of cm-scale area in (d) showing an individual fault plane within the fault zone. Note that the latter is a composite deformation structure which is also associated with calcite veins and dismembered clasts

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