Abstract
Mafic layers displaying transition between clinopyroxenite and eclogite within peridotite from felsic granulite in the Bohemian Massif (Lower Austria) have been investigated. The mafic–ultramafic bodies shared a common granulite facies metamorphism with its hosting felsic rocks, but they still preserve evidence of eclogite facies metamorphism. The selected mafic layer for this study is represented by garnet with omphacite in the core of coarse-grained clinopyroxene, while fine-grained clinopyroxene in the matrix is diopside. In addition, garnet contains inclusions of omphacite, alkali feldspars, hydrous and other phases with halogens and/or CO2. Textural relations along with compositional zoning in garnet from the clinopyroxenite-eclogite layers favour solid-state recrystallization of the precursor minerals in the inclusions and formation of garnet and omphacite during subduction. Textures and major and trace element distribution in garnet indicate two stages of garnet growth that record eclogite facies and subsequent granulite facies overprint. The possible model explaining the textural and compositional changes of minerals is that the granulite facies overprint occurred after formation and exhumation of the eclogite facies rocks.
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Acknowledgements
This work was supported by the Czech Science Foundation (research project number 18-03160S) and by institutional project Progres Q45. We are grateful to an anonymous reviewer for detailed review that helped us to considerably improve the manuscript. We also thank M.A.T.M. Broekmans for editorial handling.
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Editorial handling: M. A.T.M. Broekmans
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Faryad, S.W., Jedlicka, R., Hauzenberger, C. et al. High-pressure crystallization vs. recrystallization origin of garnet pyroxenite-eclogite within subduction related lithologies. Miner Petrol 112, 603–616 (2018). https://doi.org/10.1007/s00710-018-0557-z
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DOI: https://doi.org/10.1007/s00710-018-0557-z