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All,
   The question remains: how does Ti substitute in garnet?  This will
affect what buffer is required for ths system (e.g., rutile-quartz,
ilmenite-sillimanite-quartz, etc.).
eric


>Hello all,
>
>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.
>
>cheers horst
>
>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)
>
>
>=================================
>Horst Marschall
>Mineralogisches Institut
>Universitaet Heidelberg
>INF 236
>69120 Heidelberg
>++49-(0)6221-546021
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>=================================