Dear Craig,
As an aside (and I know I'm always harping on about it) THERMOCALC can
do the job nicely for you. You can use Tim Holland's AX to recalculate
your probe analyses using (the most?) recent activity models. The
thermodynamic properties of the phases of interest and pertinent
reactions between them is based on the most recently available
experimental data so the answers you get (using 'Average P mode') should
give you the most accurate 'calibration' of the GADS barometer.
Both THERMOCALC v.2.75 and AX are available at Tim Holland web-site:
http://www.esc.cam.ac.uk/astaff/holland/index.html
Cheers,
Tim
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Dr. T.E. Johnson
Institut für Mineralogie und Petrologie,
Karl-Franzens-Universität Graz,
Universitätsplatz 2, A-8010 Graz, AUSTRIA
Tel.: +43-316 380-5522 Fax: +43-316 380-9865
Mobile: +43 664 794-0193
e-mail: [log in to unmask]
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