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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

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

Fig. 4

a, b Schematic sketch and stratigraphic log, not to scale, of the Fuorcla Cotschna area based on transects A and B described in the text. c Massive dolostones belonging to the Hauptdolomit Fm. crossed by randomly oriented fractures filled with orange-yellow saddle dolomite. d Bardella Fm.: sedimentary clast-supported breccias made up of Triassic carbonate clasts. e Saluver A Fm.: clast- to matrix-supported conglomerates with carbonate and basement-derived clasts in a coarse sandy matrix. Note veins within clasts stopping at clast edges. f Decimeter-sized block of Bardella Fm. reworked in the red sandstones of the Saluver Fm. g Thick-bedded conglomerates constituted of carbonate and basement-derived clasts showing a peculiar brownish color of the carbonate clasts. The shiny black portion is silicified matrix. h Big “nodule” of chert within the lowermost part of Radiolarian Cherts crossed by an irregular network of quartz-filled fractures. Scales hammer (33 cm long), lens cap (6 cm in diameter)

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