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Fig. 9 | Swiss Journal of Geosciences

Fig. 9

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

Fig. 9

Summarized relation between vitrinite and the illite maturation paths from high diagenesis to the epizone, divided by low, moderate, and high geothermal trends (Ferreiro Mählmann et al. 2012). Note the shift of CIS to KI values at the Kübler limits of the anchizone from low to high orogenic geothermal gradient. The maximum difference on the CIS values (published by Brime 1999) has been chosen to show the largest possible discrepancy on the correlation variance

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