Hello Hassina,
perhaps (it isn't very very actual), the followed reference will be good for
you:
Nichols et al., 1992. Internally consistent gahnitic spinel-cordierite-garnet
equilibria in the FMASH Zn system: geothermobarometry and
applications. "Contrib. Min. Petrol. v.111, pp.362-377.
You can see, how the Zn contribuit to bigger the spinels' stability field with
the variations of P and T...
Cheers, antonio.
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Antonio Miguel Alvarez Valero
Dipartimento di Mineralogia e Petrologia, Universita' di Padova
Corso Garibaldi, 37, I-35137 PADOVA ITALY
Tel: 0039 049-8272032 Fax: 0039 049-8272010
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