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Ar data from the region. Illite crystallinity points to temperatures of c. 200 8C. The peak temperature of overprint was at c. 180 8C in the Berchtesgaden mine (vitrinite reflectance, fluid inclusions) and .240 8C in the Altaussee mine (fluid inclusions). These temperatures are below the value of 255 8C, where polyhalite starts to dehydrate. Disturbed age spectra patterns result from multiphase polyhalite growth; however, single phases and completely recrystallized fabrics yield good results. As in the Alpine test case, polyhalite may characteristically serve as a geochronometer for diagenetic and very-low-grade metamorphic processes.

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