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Zoned garnet and amphibole occur in metabasites of the Kraubath Massif, Eastern Alps, that contain relic magmatic clinopyroxene. The amphibole composition gradually changes from core ( X  Mg  = 0·83) to rim ( X  Mg  = 0·6–0·7). A number of compositional varieties of garnet occur in the metabasite. An older porphyroblastic garnet (Py 23–27 , Alm 41–43 , Grs 29–33 ) has two different compositional domains, one relatively rich in Mg (Py 27–30 ) and the other rich in Ca (Grs 35–38 ) with a low Mg (Py 20–25 ) content. The youngest variety, which forms rims on, or microveins in, the porphyroblastic garnet, has high Ca and low Mg (Grs 40–57 , Py 2–7 , Alm 46–51 ). The amphibole cores and garnet porphyroblasts are interpreted to represent minerals formed during Variscan regional metamorphism under amphibolite-facies conditions. Alpine metamorphism is represented by the most recent Ca-rich and Mg-poor variety of garnet that coexists with the amphibole rims, epidote and chlorite. Fracturing in the porphyroblastic garnet probably originated during retrogression of the Variscan amphibolite-facies assemblages. Textural relations suggest that the garnet in the microveins formed by dehydration of hydrous phases during an Alpine metamorphic overprint that reached  P – T  conditions of 550–583°C at 1·0 GPa.

Complex Growth Textures in a Polymetamorphic Metabasite from the Kraubath Massif (Eastern Alps)