Hydration of natural glass and formation of perlite
The hydration rate of rhyolitic glass has been determined at temperatures ranging from 5° C to 100° C. The relationship between the depth of hydration, x, and time, t is x2 = kt; k varies from 0.4 μ2/103 years at 5° C to 104 μ2/103 years at 100° C; k is independent of the water pressure from a few hundredths of a centimeter to 1 atm. water pressure. The activation energy of hydration is about 20 kcal/mole. The determined hydration rates are consistent with the observation that perlite commonly forms by the hydration of shattered rhyolitic glass, either during the late cooling of a deposit or after the deposit has cooled to a surficial temperature.
Citation Information
Publication Year | 1966 |
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Title | Hydration of natural glass and formation of perlite |
DOI | 10.1130/0016-7606(1966)77[323:HONGAF]2.0.CO;2 |
Authors | I. Friedman, R. L. Smith, W.D. Long |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Geological Society of America Bulletin |
Index ID | 70206947 |
Record Source | USGS Publications Warehouse |