Abstract
In Kamativi, Rhodesia, large, flat dipping cassiterite pegmatites are emplaced as dome-like structures in Precambrian schists, gneisses and granites. In these complex, unzoned tin-bearing pegmatites, which were probably formed by intrusive silicate melts, three main mineral phases are superposed on each other: 1. alkali feldspar-quartz-spodumene; 2. quartz-albite; 3. muscovite-quartz. Petalite is sometimes developed at the expense of the first two mineral phases and is in its turn attacked by the muscovite-quartz assemblage.
Résumé
A Kamativi en Rhodésie, de grandes pegmatites contenant de la cassitérite, à pente faible, se trouvent mises en place sous forme de dômes dans des schistes, des gneiss et des granites de l'Anté-Cambrien. Dans les pegmatites stannifères complexes, non-zonées, probablement formées par des intrusions de silicates, trois phases minérales principales sont superposées les unes aux autres, à savoir: 1. feldspath alcalin-quartz-spodumène; 2. quartz-albite; 3. muscovite-quartz. Quelquefois, de la pétalite s'est formée aux dépens des deux premières phases minérales et se trouve, à son tour, attaquée par la combinaison de muscovitequartz.
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Rijks, H.R.P., van der Veen, A.H. The geology of the tin-bearing pegmatites in the eastern part of the Kamativi district, Rhodesia. Mineral. Deposita 7, 383–395 (1972). https://doi.org/10.1007/BF00208367
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DOI: https://doi.org/10.1007/BF00208367