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Swiss Journal of Geosciences
Fig. 2 | Swiss Journal of Geosciences

Fig. 2

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

Fig. 2

Plot of vitrinite reflectance and bituminite reflectance values from samples where both macerals were measured. In all areas referred, the same preparation and measurement technique was applied and may give the reason of the low variance along the 1:1 reference line between 1.5 and 4.5. Solid bituminite can be used for determining very low-grade metamorphism. The scattering above 5.5 is due to different trends related to strain increase and contact metamorphism in the studied tectonic settings

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