Abstract
Biotites occurring in igneous and metamorphic-metasomatic rocks have been critically studied. The study reveals a marked difference between the chemical composition of biotites from igneous rocks on one hand and those from metamorphic-metasomatic ones on the other. It is concluded that the chemical composition of a biotite reflects the environment of its formation as well as that of the rock containing it. The most frequently occurring ferromagnesian mineral in granites is biotite. As such it is thought that by processing the chemical data as suggested in this paper it should be possible to distinguish between granites formed by more than one mode of origin.
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