Muscovites: d060 versus d331̅,060 spacing: its use for geobarometric purposes
Rieder, Milan; Guidotti, Charles V.; Sassi, Francesco P.; Weiss, Zdenek
European Journal of Mineralogy Volume 4 Number 4 (1992), p. 843 - 846
published: Aug 11, 1992
manuscript accepted: May 19, 1992
manuscript received: Mar 28, 1992
ArtNo. ESP147050404004, Price: 29.00 €
Abstract The phengite peak at d = 1.5Å, formerly often labelled as 060, is a convolution of 331̅and 060, whose intensities are in the ratio of about 2: 1 . Since both diffracting planes are practically perpendicular to (001), no preferred orientation can separate one diffraction peak from the other. By converting d331̅,060 to b, we introduce a systematic error. The correlation between d331̅,060 and the (Fe + Mg) content of muscovites remains valid as does the use of d331̅,060 for geobarometry within a given petrological and bulk-compositional context.