Abstract
Mantle xenoliths in Neogene alkali basalts of the Bakony–Balaton Highland Volcanic Field (Western Hungary) frequently have melt pockets that contain silicate minerals, glass, and often carbonate globules. Textural, geochemical and thermobarometric data indicate that the melt pockets formed at relatively high pressure through breakdown of mainly amphibole as a result of temperature increases accompanied, in most cases, by the influx of external metasomatic agents. New elemental and Sr–Nd–Pb isotope data show that in several xenoliths the external agent was either a LIL-enriched aqueous fluid or a CO2-rich fluid, whereas in other xenoliths the melt pockets were additionally enriched in LREE and sometimes HFSE, suggesting metasomatism by a silicate melt. The compositional character of the external agents might have been inherited by melting of a hydrated and probably carbonated deeper lithospheric component, which itself was metasomatized by melts with significant slab-derived components.
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Acknowledgments
We thank Paolo Olmi, Orlando Vaselli (University of Florence) and Berit Wenzel (University of Copenhagen) for help during microprobe analyses. Hilary Downes (University of London), Szabolcs Harangi and Kálmán Török (Eötvös University), Attila Demény (Hungarian Academy of Science) are thanked for discussions. We are grateful to the fellows at the Lithosphere Research Fluid Lab (Eötvös University) for their assistance, and to Massimo Coltorti and an anonymous reviewer for their detailed work and suggestions. Previous reviews by G. Rivalenti and D. Ionov also significantly improved the paper. This work was supported by the Hungarian National Science Foundation (OTKA T030846 to C. Szabó), the European Commission Marie Curie Fellowship Program, and the Danish Lithosphere Centre. This is publication No 27 of the Lithosphere Fluid Research Lab of the Department of Petrology and Geochemistry at Eötvös University, Budapest.
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Bali, E., Zanetti, A., Szabó, C. et al. A micro-scale investigation of melt production and extraction in the upper mantle based on silicate melt pockets in ultramafic xenoliths from the Bakony–Balaton Highland Volcanic Field (Western Hungary). Contrib Mineral Petrol 155, 165–179 (2008). https://doi.org/10.1007/s00410-007-0234-4
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DOI: https://doi.org/10.1007/s00410-007-0234-4