Abstract
A fine network of aplites, pegmatites, and veins, together with partially assimilated granitic xenoliths, reveals the progress of differentiation within a set of lamprophyric dikes. First, intratelluric augite and biotite were replaced by pargasite, with simultaneous precipitation of more pargasite and of intermediate plagioclase and saussurite. These were followed by albite as aplite, by microcline and muscovite as micropegmatite, and by epidote and calcite as veins. A quantitative analysis shows that the dike rock corresponds to Camptonose III.I.5.3.4, and suggests that the average amphibole is low in lime and perhaps high in potash.
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