On the problem of water diffusion in the cordierites |
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| Authors: | GG Lepezin VN Melenevsky |
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| Institution: | 1. G. G. Lepezin, Institute of Geology and Geophysics of Siberian Branch Academy of Sciences of the USSR Novosibirsk, 90 USSR;2. V.N. Melenevsky, Siberian Scientific Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, 104 USSR |
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| Abstract: | The dehydration of cordierites in vacuo has been studied by mass spectrometry. Activation energies of dehydration from cordierites of epidote-amphibolitic, amphibolitic and two-pyroxenitic facies have been established to be 25–40, 30–50 and 50–65 kcal/mol, respectively. The conclusion drawn, based on these values, is that natural cordierites with higher HaO were cooled at depth, or that they have been formed not by metamorphic processes of normal subsidence but by additional thermal sources. |
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