Geodynamic implications of flattened tabular equigranular textured peridotites from the Bakony-Balaton Highland Volcanic Field (Western Hungary)

Károly Hidas, György Falus, Csaba Szabó, Péter János Szabó, István Kovács, Tamás Földes

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Peridotite xenoliths showing unusual tabular equigranular textures (addressed as flattened tabular equigranular) were found in Neogene alkali basalts from the Bakony-Balaton Highland Volcanic Field (Western Hungary), Carpathian-Pannonian Region. The olivines have a characteristic crystallographic preferred orientation (CPO) with [0 1 0]-axes perpendicular to the foliation and the [1 0 0]- and [0 0 1]-axes forming a continuous girdle in the foliation plane. Contrarily, the CPO pattern of orthopyroxene is much more scattered, although a single maximum can be observed in [0 0 1] axes subparallel to the plane of foliation. In case of olivine, the activation of (0 1 0)[1 0 0] and also probably (0 1 0)[0 0 1] is suggested. The deformation micro-mechanisms of orthopyroxenes are suggested to be a combination of intracrystalline glide on the (1 0 0)[0 0 1] system and some kind of other mechanism resulting in quite scattered patterns. We suggest that the unusual orientation patterns of olivines and orthopyroxenes are the result of the complex tectonic evolution of the region. The flattened tabular equigranular xenoliths represent a structural domain within the subcontinental lithospheric mantle beneath the volcanic field with particular seismic characteristics. The occurrence of flattened domains in the upper mantle may considerably influence the percolation and residence time of the mantle melts and fluids, which could promote or prevent melt/wall-rock interaction.

Original languageEnglish
Pages (from-to)484-503
Number of pages20
JournalJournal of Geodynamics
Volume43
Issue number4-5
DOIs
Publication statusPublished - May 1 2007

Keywords

  • Bakony-Balaton Highland Volcanic Field
  • Carpathian-Pannonian Region
  • Crystallographic preferred orientation (CPO)
  • EBSD
  • Flattened tabular equigranular texture
  • Peridotite xenoliths

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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