Abstract
An investigation of rates of reaction in granite-water systems was undertaken at 10 kb pressure using five chemically-analyzed calc-alkaline rocks and two haplogranitic compositions in the system KAlSi3O8-NaAlSi3O8-SiO2. Production of melt in the Sierra Nevada granite, granodiorite, and tonalite was determined at 665° C as a function of time. At least three hours seem necessary to develop a constant amount of melt in the granite and granodiorite; the tonalite requires at least 24 hours. In reversal runs from 665° C (hypersolidus) to 620° C (subsolidus), between 7 and 18 days are required to completely crystallize the granitic glasses. Composition and structural state of coexisting alkali feldspars from reversal runs on the hypersolvus granite further suggest that 18 days are insufficient to attain a tentative equilibrium state.
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Piwinskii, A.J., Martin, R.F. An experimental study of equilibrium with granitic rocks at 10 kb. Contr. Mineral. and Petrol. 29, 1–10 (1970). https://doi.org/10.1007/BF00387994
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DOI: https://doi.org/10.1007/BF00387994