Geochemical characterization of the Pannonian Basin mantle lithosphere and asthenosphere: An overview

A. Embey-Isztin, G. Dobosi, H. Downes

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Petrologic, geochemical and geophysical research revealed that the mantle lithosphere is thin and hot beneath the Pannonian Basin. Deformation, recrystallization and shear zones are characteristic of the uppermost part of the mantle lithosphere and they are intensively developed in the central part of the basin. Ductile shearing is linked to LREE-enrichment in the mantle. Major and trace-element abundance as well as Sr, Nd and Pb isotope studies enabled us to delineate the major geologic events occuring in the mantle lithosphere. The oldest known event was a partial melting and a major extraction of basalt that resulted in LREE-depleted refractory mantle. Later in its history the refractory mantle was re-enriched in highly incompatible elements and components with radiogenic Sr and Pb isotope compositions. The enrichment was a complex process that occurred in several steps. We can identify at least two types of enrichment and metasomatism in the mantle, (1) related to the passage of alkaline magmas similar to the host lavas, and (2) related to the subduction-derived fluids. The latter component is not seen in other regions of Neogene alkaline magmatism of Europe where subduction has not occurred since Hercynian times.

Original languageEnglish
Pages (from-to)259-280
Number of pages22
JournalActa Geologica Hungarica
Volume44
Issue number2-3
Publication statusPublished - 2001

Fingerprint

asthenosphere
lithosphere
mantle
basin
subduction
isotope
metasomatism
Neogene
partial melting
shear zone
magmatism
basalt
trace element
fluid
history

Keywords

  • Alkali basalt
  • Astenosphere
  • Deformation
  • Depletion
  • Enrichment
  • Mantle lithosphere
  • Peridotite xenolith

ASJC Scopus subject areas

  • Geology

Cite this

Geochemical characterization of the Pannonian Basin mantle lithosphere and asthenosphere : An overview. / Embey-Isztin, A.; Dobosi, G.; Downes, H.

In: Acta Geologica Hungarica, Vol. 44, No. 2-3, 2001, p. 259-280.

Research output: Contribution to journalArticle

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