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Fig. 2 | Swiss Journal of Geosciences

Fig. 2

From: Geochemical signature of paleofluids in microstructures from Main Fault in the Opalinus Clay of the Mont Terri rock laboratory, Switzerland

Fig. 2

a Photograph showing a detail from upper fault zone boundary of the Main Fault. The picture was taken at the outcrop in gallery 98 (viewing direction ENE). Numbers refer to samples types as given in Fig. 6. Note the thin, continuous dark band of gouge (7) next to brighter undeformed material (1) and the scaly clay next to (8) and away from the gouge (5). b Photograph (shaded light) of a water immersed gouge sample taken from the Main Fault outcrop in gallery 98. Due to the water immersion, the foliation stands out, illustrating two different gouge types (7a and 7b). The foliation also suggests high fabric intensity within the gouge. Note the sharp boundary between both types. c Photograph (shaded light) of a water immersed scaly clay sample from the Main Fault outcrop in gallery 98. Note the high variability in foliation orientation. d Detail of c showing bend bedding foliation (micro-fold) and discordant shear zones (6)

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