Controls on tetrahedral Fe(III) abundance in 2:1 phyllosilicates—Discussion
Résumé
Cuadros et al. (2019) used a wide range of data from dioctahedral and trioctahedral Fe 3+-bearing 2:1 phyllosilicates, to propose a model describing how tetrahedral occupancy by Fe 3+ takes place in both dioctahedral and trioctahedral 2:1 phyllosilicates. The partition coefficient approach (Decarreau and Petit, 2014) while focusing on distribution of Al 3+ and Fe 3+ between octahedral and tetrahedral sites of dioctahedral smectites has been disregarded in the Cuadros et al. (2019)'s study. This approach was applied here on the Cuadros et al. (2019)'s set of data. The partition coefficient value linked to the distribution of Al 3+ and Fe 3+ between octahedral and tetrahedral sites determined from natural and synthetic dioctahedral smectites applies well to trioctahedral phyllosilicates too. Data from synthetic iron-rich 2:1 smectites fit also well with both Cuadros et al. (2019) and Decarreau and Petit (2014) models.
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