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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

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

Fig. 4

a, b Photo and interpretative sketch of a water-immersed gouge sample showing gouge (dark black) internal shear zones and grains, as-well as brighter wall rock clasts. The pictured sample was collected in the gallery 08, at the limit between the upper and lower Main Fault segments (from Techer et al. 2017). c Slightly dissolved pyrite grains of the gouge. d Authigenic gypsum crystals of the gouge. The c′, d’ chemical spectra highlight the dominant occurrence of S in both and of Fe in the former and Ca in the latter

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