Remnants of boninitic melts in the upper mantle beneath the central Pannonian Basin?

Enikö Bali, György Falus, Csaba Szabó, David W. Peate, Károly Hidas, Kálmán Török, Theodor Ntaflos

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23 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)51-72
Number of pages22
JournalMineralogy and Petrology
Volume90
Issue number1-2
DOIs
Publication statusPublished - May 1 2007

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ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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