Volume relaxation of compacted SiO2 glass: a model for the conservation of natural diaplectic glasses |
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| Authors: | Sabine Höfler Friedrich Seifert |
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| Institution: | Mineralogisches Institut, Universität Kiel, Olshausenstrasse 40, 2300 Kiel F.R.G. |
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| Abstract: | Relaxation experiments on vitreous SiO2, densified at 900°C, 20 kbar to a permanent density of 2.36 g cm?3 yield an activation energy of69 ± 5kcal mol?1 in the temperature range 700–800°C. The data can be used to estimate minimum cooling rates, maximum depositional temperatures or maximum thicknesses of shock-metamorphosed rocks containing diaplectic glasses, if relaxation of a glass densified under dynamic conditions is assumed to be similar to that of statically densified glass. |
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