CHEMICAL DIVERSITY OF GRANITE-HOSTED BASI C ROCKS - THE ANSIGNAN VARISCAN GRANITE (PYRENEES ORIENTALES, FRANCE)

The Variscan Ansignan granite (Pyrenees Orientales) displays a high Mg -K calc-alkaline chemistry and holds a large variety of igneous enclav es. Basic members are classified into four distinct groups on the basi s of their Al, Cr, Mg, Fe and Ti contents and the ratios between inert incompatibles; in addition to the tholeiites present in the surroundi ng metamorphic series, we observe two types of calc-alkaline basalts a nd minette-like compositions. Despite their relative rarity, only the latter may have some genetic link with the granite. This granite thus rose through the same channel as a wide range of unrelated, mantle-der ived melts.