Thank everybody for information about the Ti/rutile in garnet problem. I
also received some e-mails on the topic beside the discussion-list.
The most interesting one is about measurements on natural garnets and
experiments done by A. Brandelik (Stuttgart/Germany) who is currently
working on a Ti-in-Grt Thermometer/Barometer. There was an abstract in an
1998 AGU volume.
Massone HJ & Brandelik A (1998) Ti in Al-Garnet - a Newly Calibrated
Geothermobarometer for HP and UHP Metamorphic Rocks. EOS, Transactions,
AGU Fall Meeting, Vol 79, No.45 November 10, 1998/Supplement (page F972)
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