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

Fig. 3

From: The pioneer work of Bernard Kübler and Martin Frey in very low-grade metamorphic terranes: paleo-geothermal potential of variation in Kübler-Index/organic matter reflectance correlations. A review

Fig. 3

Plot of: a mean crystallite thickness and Kübler-Index values from samples of Helvetic units. b Mean lattice strain and Kübler-Index of the same samples. c Mean lattice strain and mean crystallite thickness showing the close relationship with the Kübler-Index. Filled symbols are from air-dried and open symbols from ethylene glycol-solvated mounts. Squares and triangles are from deformed rocks, where triangles are mostly from tectonites of the Gellihorn nappe and quartz-ductile deformed rocks with a penetrative cleavage. In samples with strong value scattering and in the outlier at 0.53 Δ°2θ an intensive fluid driven re-crystallisation of illite (more prominent than chlorite) was recognised (modified after Árkai et al. 2002a)

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