Uncertainties in the activities of garnets and their propagation into geothermobarometry
European Journal of Mineralogy Volume 6 Number 2 (1994), p. 291 - 296
published: Mar 31, 1994
manuscript accepted: Jan 3, 1994
manuscript received: Oct 15, 1993
ArtNo. ESP147050602013, Price: 29.00 €
Abstract The effect of uncertainties in the activities of garnets on P-T estimates are explored by propagating the (co-)variances of an internally consistent set of the least squares-derived mixing parameters through the thermodynamic formulations of(l) the garnet-biotite geothermometer and (2) the garnet-Al2SiO5-plagioclase-quartz (GASP) geobarometer. In combination with uncertainties related to ΔH°R, ΔS°R and composition, total uncertainties incorporating all types of errors can now be estimated.