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Located at the internal border of the Grand-Saint-Bernard Zone, the diorite and its aureole lie on top of intensively studied Alpine eclogitic units but this pluton, poorly studied yet, has kept locally almost undeformed. The pluton intruded, at ~360Ma, country-rocks mostly composed of dark shales with Na 2 O>K 2 O and minor mafic intercalations of tholeiitic basalt affinity. This...
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