Determination of a normal orogenic palaeo-geothermal gradient with clay mineral and organic matter indices: a review
Rafael Ferreiro Mählmann,
Meinert Rahn,
Sébastien Potel
et al.
Abstract:A collection of large data sets from different orogenic belts was compiled for a correlation between organic matter (OM) versus clay mineral (CM) indices calibrated with the vitrinite reflectance, (VR) vs Kübler-Indices (KI) method. Data selection was based on a normal geothermal gradient (25 to 35 °C/km) as determined in previous studies, e.g. by maturity modelling and clay mineral reaction progress calculations. In the Lower Austroalpine (Eastern Switzerland, European Alps) a 20 myr lasting metamorphic overp… Show more
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