Remnants of boninitic melts in the upper mantle beneath the central Pannonian Basin? |
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Authors: | E. Bali G. Falus C. Szabó D. W. Peate K. Hidas K. Török T. Ntaflos |
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Affiliation: | Lithosphere Fluid Research Lab, Department of Petrology and Geochemistry, E?tv?s University, Budapest, Hungary E?tv?s Loránd Geophysical Institute, Budapest, Hungary Department of Geoscience, University of Iowa, Iowa, USA Department of Geological Sciences Geozentrum, University of Vienna, Wien, Austria
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Abstract: | Summary We present a detailed textural and compositional study of two orthopyroxene-rich olivine websterites. One occurs as a vein in a harzburgite xenolith and the other is an individual xenolith, both found at Szentbékkálla in the Bakony–Balaton Highland Volcanic Field (central Pannonian Basin, western Hungary). The textural features of these orthopyroxene-rich rocks suggest that they crystallized from silicate melts to form veins in peridotite mantle rock. Their geochemical features, such as the presence of Al2O3-poor orthopyroxenes, Cr-rich spinels, and clinopyroxenes with U-shaped chondrite-normalized REE-patterns, indicate that the vein material formed from Mg-rich silicic (boninitic) melts at mantle depths. The olivine fabric investigation of both the veins and the wall-rock suggest that the development of the veins was followed by subsequent recrystallization during the Cenozoic evolution of the Carpathian–Pannonian region. |
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