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Swiss Journal of Geosciences
Fig. 7 | Swiss Journal of Geosciences

Fig. 7

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

Fig. 7

Overview of macro- and microphotographs from normal faults. a Microphotograph of normal fault without mineralization. b BSE SEM image of (a) shows grain size reduction within the normal fault as well as a change in the shape preferred orientation of the clay minerals, relative to the surrounding Opalinus Clay matrix. c, d Microphotograph of normal fault with parallel calcite vein cutting the matrix at high angle. e Macroscopic image of fault plane with calcite precipitates. f Microphotograph of thin section of (e) showing the normal fault. Horizontal bedding layers are dragged into the fault plane. g Microphotograph of fault plane shows: calcite veins, coarse-grained calcite (CC) and quartz (QZ), celestite (CT) ribbons and coarse-grained CC ribbon. Samples (a, b) TRU1_1_849.70B, (c, d) MAR1_1_668.85, (e, f, g) TRU1_1_846.70

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