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Phase equilibria and compositions of Fe-Mg-Al minerals and melts in water-saturated peraluminous granitic systems

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Abstract

Phase assemblages and phase compositions were studied experimentally in water-saturated, biotite-bearing peraluminous granitic melts as a function of alumina excess and temperature. The runs were performed at 2 and 5 kbars under NNO buffer. Biotite was stable only in composition containing 5% of normative corundum; it coexisted with cordierite and hercynite at 2 kbars and with hercynite at 5 kbars. In composition containing 10% of normative corundum biotite was not observed; abundant cordierite and hercynite were the only Fe-Mg-Al minerals. These relationships show that, at constant pressure, the amount of cordierite increases with increasing excess of alumina. Simultaneously the stability of biotite decreases due to preferential partitioning of Mg into cordierite and Fe into biotite. Besides the distribution of Fe, Mg and Al among the coexisting solid phases, solubility of these elements in the melts is given. Below 900° C melts are poor in iron and magnesium and correspond, in terms of these elements, to leucogranites. It is suggested that the leucogranitic magmas, such as parental magmas of European Hercynian and Himalayan leucogranites, must have been formed through highly efficient separation of partial melt from restite, in which ferromagnesian components are concentrated. Peraluminous granites rich in ferromagnesian minerals originate supposedly from restite-bearing magmas.

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  1. Institut für Mineralogie und SFB 173, Universität Hannover, Welfengarten 1, D-3000, Hannover 1, Federal Republic of Germany

    Jacek Puziewicz & Wilhelm Johannes

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  1. Jacek Puziewicz
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  2. Wilhelm Johannes
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Puziewicz, J., Johannes, W. Phase equilibria and compositions of Fe-Mg-Al minerals and melts in water-saturated peraluminous granitic systems. Contrib Mineral Petrol 100, 156–168 (1988). https://doi.org/10.1007/BF00373582

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