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Contributions to Mineralogy and Petrology

, Volume 146, Issue 4, pp 493–505 | Cite as

Magmatism-related localized deformation in the mantle: a case study

  • György Falus
  • Martyn R. Drury
  • Hermann L. M. van Roermund
  • Csaba SzabóEmail author
Original Paper

Abstract

A deformed composite peridotite-pyroxenite xenolith in Pliocene alkali basalts from the Pannonian Basin (Szentbékkálla, Bakony—Balaton Highland Volcanic Field) has been studied in detail. A narrow shear zone of intense deformation marked by porphyroclast elongation and recrystallization runs along the peridotite-pyroxenite contact. The xenolith contains a large volume of euhedral olivine neoblasts and tablet grains of olivine away from the “shear zone” interpreted as products of annealing and recrystallization in the presence of grain boundary fluid. Estimates of the time required for growth of recrystallized olivine grains suggest that the annealing took place in situ in the mantle and not during transport of the xenolith in the basalt magma. The grain boundary fluid present during recrystallization was a vapor rich silicate-melt different from the host basaltic melt that entrained the xenolith. This study demonstrates that high-stress deformation zones and associated fluid-assisted recrystallization, which are common features in kimberlite mantle xenoliths, also occur in some mantle xenoliths from alkali basalts. The suggested high-stress deformation zones in the mantle beneath the Pannonian Basin may be produced by paleoseismic events in the lithosphere associated with faulting related to the ascent of basalt magma.

Keywords

Olivine Shear Zone Mantle Xenolith Alkali Basalt Pannonian Basin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful for Kálmán Török (Eötvös University, Budapest) for the sample. We also acknowledge the analytical and SEM facilities of the Utrecht University. We thank the HPT lab, Department of Earth Sciences, Utrecht University for digital images. Special thanks to the members of the Lithosphere Fluid Research Lab (Eötvös University, Budapest) for their great help. Partial funding for this work was provided by the Hungarian National Scientific Foundation (OTKA) Grant T030846 to Csaba Szabó. We acknowledge the support of the European Community Access to Research Infrastructure action of the Improving Human Potential Programme, contract HPRI-CT-1999-00008 awarded to Prof. B.J. Wood (EU Geochemical Facility,University of Bristol). We are very grateful for professor David Green for fruitful discussion. We also acknowledge the careful and helpful reviews of Alfons Berger (University of Bern), Mark Handy (Free University, Berlin) and the anonymous reviewers.

This is publication no.11 of the Lithosphere Fluid Research Lab of the Department of Petrology and Geochemistry at Eötvös University, Budapest.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • György Falus
    • 1
  • Martyn R. Drury
    • 2
  • Hermann L. M. van Roermund
    • 2
  • Csaba Szabó
    • 1
    Email author
  1. 1.Department of Petrology and GeochemistryEötvös UniversityBudapestHungary
  2. 2.Department of Earth SciencesUtrecht UniversityUtrechtThe Netherlands

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