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Complex growth textures in a polymetamorphic metabasite from the Kraubath Massif (Eastern Alps)

, : Complex growth textures in a polymetamorphic metabasite from the Kraubath Massif (Eastern Alps). Journal of Petrology 45(7): 1441-1451

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 (sub Mg) = 0.83) to rim (X (sub Mg) = 0.6-0.7). A number of compositional varieties of garnet occur in the metabasite. An older porphyroblastic garnet (Py (sub 23-27) , Alm (sub 41-43) , Grs (sub 29-33) ) has two different compositional domains, one relatively rich in Mg (Py (sub 27-30) ) and the other rich in Ca (Grs (sub 35-38) ) with a low Mg (Py (sub 20-25) ) content. The youngest variety, which forms rims on, or microveins in, the porphyroblastic garnet, has high Ca and low Mg (Grs (sub 40-57) , Py (sub 2-7) , Alm (sub 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 degrees C at 1.0 GPa.


DOI: 10.1093/petrology/egh018

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