Origin and significance of poikilitic and mosaic peridotite xenoliths in the western Pannonian Basin

geochemical and petrological evidences

Antal Embey-Isztin, G. Dobosi, Jean Louis Bodinier, Delphine Bosch, G. A. Jenner, Simone Pourtales, Olivier Bruguier

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Peridotite xenoliths erupted by alkali basaltic volcanoes in the western Pannonian Basin can be divided into two fundamentally contrasting groups. Geochemical characteristics of the abundant protogranular, porphyroclastic and equigranular nodules suggest that these samples originate from an old consolidated and moderately depleted lithospheric mantle domain. In contrast, the geochemical features of the worldwide rare, but in the Pannonian Basin relatively abundant, poikilitic xenoliths attest to a more complex evolution. It has been argued that the origin of the peculiar texture and chemistry may be intimately linked to melt/rock reactions at successively decreasing liquid volumes in a porous melt flow system. The most likely site where such reactions can take place is the asthenosphere–lithosphere boundary. In this context, poikilitic xenoliths may provide petrological and geochemical evidence for reactions between magmatic liquids issued from the uprising asthenosphere and the solid mantle rocks of the lithosphere. These reactions are important agents of the thermal erosion of the lithosphere; thus, they could have considerably contributed to the thinning of the lithosphere in the Pannonian region. We suggest that in the Pannonian Basin, there could be a strong relation between the unusual abundance of poikilitic mantle xenoliths and the strongly eroded lithosphere.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalContributions to Mineralogy and Petrology
Volume168
Issue number3
DOIs
Publication statusPublished - Sep 1 2014

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peridotite
lithosphere
Rocks
Earth mantle
Volcanoes
Liquids
Alkalies
mantle
basin
Erosion
Textures
melt
rocks
liquid
asthenosphere
nodules
liquids
volcanoes
rock
erosion

Keywords

  • Melt/rock interaction
  • Pannonian basin
  • Peridotite
  • Poikilitic
  • Xenolith

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Origin and significance of poikilitic and mosaic peridotite xenoliths in the western Pannonian Basin : geochemical and petrological evidences. / Embey-Isztin, Antal; Dobosi, G.; Bodinier, Jean Louis; Bosch, Delphine; Jenner, G. A.; Pourtales, Simone; Bruguier, Olivier.

In: Contributions to Mineralogy and Petrology, Vol. 168, No. 3, 01.09.2014, p. 1-16.

Research output: Contribution to journalArticle

Embey-Isztin, Antal ; Dobosi, G. ; Bodinier, Jean Louis ; Bosch, Delphine ; Jenner, G. A. ; Pourtales, Simone ; Bruguier, Olivier. / Origin and significance of poikilitic and mosaic peridotite xenoliths in the western Pannonian Basin : geochemical and petrological evidences. In: Contributions to Mineralogy and Petrology. 2014 ; Vol. 168, No. 3. pp. 1-16.
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