Determination of the miscibility gap on the solid solution series paragonite-margarite by means of the infrared spectroscopy |
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| Authors: | Gerhard Franz Thomas Hinrichsen Ellen Wannemacher |
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| Institution: | (1) Mineralogisches Institut der Universität Karlsruhe, Kaiserstr. 12, D-7500 Karlsruhe, Federal Republic of Germany;(2) Universität Marburg, Fachbereich Geowissenschaften, Lahnberge, D-3550 Marburg, Federal Republic of Germany;(3) Present address: Inst. für Angewandte Geophysik, Petrologie und Lagerstättenkunde, Techn. Universität, Straße des 17. Juni 135, D-1000 Berlin 12 |
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| Abstract: | In order to study the miscibility gap of the solid solution series margarite-paragonite oxide mixtures corresponding to intermediate compositions were crystallized at H2O-pressures between 1 and 6 kb at 400 to 600 °C. Run products were examined by x-ray method and IR-spectroscopy; the latter proved to be the tool which allowed to distinguish between the two phases, the calcic and the sodic mica. A solvus exists in the region between 20 and 50 mole% margarite. Its width is temperature-dependent with a critical temperature above 600 °C. |
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