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Throughout the ultrahigh-pressure (UHP) metamorphic unit of the Dora-Maira massif, western Alps, pyrope megablasts contain the typical assemblage clinochlore–kyanite–talc–rutile ± phlogopite ± ellenbergerite as prograde inclusions. In the upper part of the UHP unit in Val Gilba, some megablasts (XMg=0.89–0.98) contain in addition polymineralic inclusions consisting of various combinations of enstatite,...
In the ultrahigh-pressure metamorphic terrane of the Dora-Maira massif, western Alps, magnesiochloritoid (up to 97 mol% end-member) occurs along with ellenbergerite, talc, chlorite or kyanite as prograde inclusions in a few pyrope megablasts. Whereas most pyrope megablasts in this terrane are relatively homogeneous (Prp90-Prp98), the magnesiochloritoid-bearing megablasts commonly preserve a clear...
In the ultrahigh-pressure metamorphic terrane of the Dora-Maira massif, western Alps, magnesiochloritoid (up to 97 mol% end-member) occurs along with ellenbergerite, talc, chlorite or kyanite as prograde inclusions in a few pyrope megablasts. Whereas most pyrope megablasts in this terrane are relatively homogeneous (Prp90-Prp98), the magnesiochloritoid-bearing megablasts commonly preserve a clear...
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