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Swiss Journal of Geosciences
Fig. 8 | Swiss Journal of Geosciences

Fig. 8

From: Standardisation, calibration and correlation of the Kübler-index and the vitrinite/bituminite reflectance: an inter-laboratory and field related study

Fig. 8

Simplified cross section of the Arosa zone near Arosa (Grisons, Switzerland). KI-VR values are combined to draw metamorphic zones (low-grade and high-grade anchizone and epizone). At three localities, spots of the epizone are related to occurrences with a Jurassic hydrothermal oceanic metamorphism. Using the CIS standards according to the Basel calibration (see Fig. 7), the low anchizone would shift out of the tectonic limits and all the Arosa zone would be of high anchizone. The shift represents an altitudinal difference of 200 m compared to the Küber-Frey standard calibration (compare Ferreiro Mählmann and Giger 2012)

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