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Swiss Journal of Geosciences
Fig. 3 | Swiss Journal of Geosciences

Fig. 3

From: Episodes of fissure formation in the Alps: connecting quartz fluid inclusion, fissure monazite age, and fissure orientation data

Fig. 3

Compilation of most common fissure quartz habits as a function of fluid type (Kandutsch, 1989; Mullis & Ramseyer, 1996; Mullis et al., 1994; Mullis, 1976a, 1983, 1991; Poty, 1969; Stalder & Touray, 1970). Quartz crystals of the higher hydrocarbone zone are generally mm-sized. Note that in amphibolite facies rocks (or in eclogites overprinted by amphibolite facies) fissures and clefts form only during retrograde greenschist facies deformation. The quartz habit is a result of fluid generated at final prograde, peak- to beginning retrograde metamorphic conditions, or during the Barrow-type metamorphic overprinting of high-pressure rocks. In general, the quartz habit developing during the early growth stages of fissure quartz predominates, but retrograde quartz overgrowth is locally common (e.g., Mullis, 1976a, 1983, 1991; Mullis et al., 1994; Niedermayr, 1993; Poty, 1969; Rykart, 1995). –c– indicates the orientation of the c-axis. The quartz morphologies and temperature estimates are compiled in Poty et. al. (2007)

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