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Swiss Journal of Geosciences
Fig. 6 | Swiss Journal of Geosciences

Fig. 6

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

Fig. 6

Overview of microscopic images of three different types of tension gashes filled with calcite (“veins”). a, b Optical light micrographs of vertical veins with wiggly walls. Calcite fibres are oriented parallel to the bedding (S0) (sample BOZ2_1_541.82 (a) and BOZ2_1_546.69 (b)). c, d Optical light micrographs of a network of oblique veins with straight walls showing elongate-blocky calcite veins with crack-seal microfabrics. The veins cut the bedding (S0) under a 45° high angle (sample STA3_1_830.87). e, f Optical light micrographs of sub-horizontal tension gash with straight walls. This gash is crosscut by oblique tension gashes with straight walls (sample MAR1_1_676.56). Microphotograph in (f) is an inset of (e)

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