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Plio-Pleistocene alkali basalt hosted mafic garnet granulite xenoliths were studied from the Bakony-\udBalaton Highland Volcanic Field (BBHVF) to trace fluid-melt-rock interactions in the lower crust. Two unique\udmafic garnet granulite samples were selected for analyses (optical microscopy, microthermometry, electron\udmicroprobe, Raman and IR spectroscopy), which contain clinopyroxene-plagioclase vein and patches with\udprimary silicate melt inclusions (SMI). The samples have non-equilibrium microtexture in contrast with\udoverwhelming majority of previously studied mafic garnet granulite xenoliths. Primary silicate-melt inclusions\udwere observed in plagioclase, clinopyroxene and ilmenite in both xenoliths. The SMI-bearing minerals located\udrandomly in Mi26 and in a clinopyroxene-plagioclase vein on the edge of Sab38 granulites. Petrography, fluid\udand melt inclusion study suggests that at least three fluid events occurred in the deep crust represented by these\udxenoliths.\ud1. Primary CO2-dominated±CO±H2S fluid inclusions were observed in the wall-rock part of Sab38 xenolith.\ud2. The crystallization of new clinopyroxene from melt, with CO2+H2O fluid.\ud3. The crystallization of new plagioclase occurred in a heterogeneous fluid-melt system with additional N2 and\udCH4 during crystallization. A local reaction was observed between sphene and acidic melt, which formed ilmenite+clinopyroxene+plagioclase±orthopyroxene.\udThe ‘water’ content of the rock forming minerals was determined by infrared spectroscopy. The calculated bulk ‘water’ content of the Mi26 xenolith is 171±51 ppm wt. %. The bulk wall rock part of the Sab38 granulite contains 55±17 ppm wt. % of ‘water’, whereas the bulk plagioclase-clinopyroxene vein contains 278±83 ppm wt. %. These results imply a very dry lower crust, locally hydrated by percolating fluids and melts

mineralogy and petrology

Melting, fluid migration and fluid-rock interactions in the lower crust beneath the Bakony-Balaton Highland volcanic field: a silicate melt and fluid inclusion study