Author: Lothar Ratschbacher
Last saved by: Tamzin Anderson
Company: TU-Freiberg

Appendix 3. Methodical and technical aspects of petrology and geothermobarometry

To record petrography as well as PT conditions of rocks, we examined polished thin sections by polarization microscopy and microprobe analyses. Mineral analyses were performed using a JEOL JXA-8900R electron microprobe equipped with five spectrometers at Freiberg. Major and minor elements were determined at 15 kV acceleration voltage and a beam current of 20 nA with counting times of 20 s for Si, Al, Mg, Ca, Sr, Ba and K, and 30 s for Fe, Ni, Na, Cr, Mn and Ti. The standard sets of the Smithsonian Institute (Jarosewich et al. 1980) and of MAC^TM were used for reference. Mineral abbreviations follow Kretz (1983) and Spear (1995). The microprobe dataset is compiled in Bachmann (2003) and available from the authors.