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Fig. 3 | Swiss Journal of Geosciences

Fig. 3

From: Evidence of hydrothermal fluid flow in a hyperextended rifted margin: the case study of the Err nappe (SE Switzerland)

Fig. 3

Photomicrographs of pre-tectonic sediments at Piz Val Lunga. a Cathodoluminescence (CL) image of a clast in the Bardella Fm. made of wackestones with sponge spicules replaced by brightly luminescent calcite spar. b Transmitted-light (TL) and (c) CL images of polymict rubble breccia cemented by coarse equant calcite spar which shows oscillatory zoning. d TL, e CL and f SEM-BSE images of former coarsely, crystalline, dull luminescent dolomite, dark grey in SEM-BSE, largely replaced by sparry calcite, which shows a moderate to bright yellow CL and is light grey in SEM-BSE. g TL and h CL images of clast-supported, monomict, poorly sorted breccias with dull luminescent dolomite clasts in a finely crystalline calcite matrix. i TL and l crossed polarizers images of mm-large fissures within the clast-supported, monomict breccias g and h with complex fills including fine-grained sediment, locally laminated, and quartz cement. m TL and n crossed polarizers images of larger veins filled with quartz. Note thin sediment drapes geopetally overlying euhedral crystal terminations of quartz crystals

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