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Hydration and phase relations of grossular-spessartine garnets at P H 2O=2 Kb

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Abstract

The phase relations in the system grossular-spessartine-H2O were investigated at 2.0 Kb aqueous fluid pressure and at subsolidus temperatures down to 420 ° C. Despite metastable persistence of a compositional gap found in some intermediate members, a complete solid solution between grossular and spessartine exists.

Linear relations between the unit cell edge, a 0, and composition were readily observed down to 620 ° C with a 0=11.849(2) Å and 11.613(2) Å for grossular and spessartine, respectively. Hydrated garnets began to appear at higher temperature for the Ca-rich members. Grossular and spessartine formed at 420 ° C have a 0=11.901(2) Å and 11.632(2) Å, indicating the presence of 0.6 and 0.2 mol H2O, respectively. Intermediate members show varying degrees of hydration. Infrared spectra of the more hydrated members show a major and minor absorption bands at 3,620 cm−1 and 3,660 cm−1, respectively, in addition to a broad band around 3,430 cm−1. All the hydrogarnets formed at 420 ° C were proven to be metastable.

The rare occurrence of the intermediate grossular-spessartine garnets may be attributed to the lack of appropriate bulk chemistry of the rock rather than to the P-T conditions to which the rock is subjected. There may be a stability field for hydrogrossular below 420 ° C at 2 Kb, but not for hydrospessartine. Any occurrence of hydrogarnet may be used as a temperature indicator setting the maximum of formation for the hydrogarnet-bearing assemblage below 420 ° C at 2 Kb.

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  1. Nevada Bureau of Mines and Geology and Dept. of Geol. Sciences, University of Nevada, 89557, Reno, Nevada, USA

    L. C. Hsu

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Hsu, L.C. Hydration and phase relations of grossular-spessartine garnets at P H 2O=2 Kb. Contr. Mineral. and Petrol. 71, 407–415 (1980). https://doi.org/10.1007/BF00374712

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