Acta Geodaetica et Geophysica

, Volume 50, Issue 2, pp 133–149 | Cite as

Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)

  • R Klébesz
  • Z Gráczer
  • Gy Szanyi
  • N Liptai
  • I Kovács
  • L Patkó
  • Zs Pintér
  • Gy Falus
  • V Wesztergom
  • Cs Szabó
Article

Abstract

The Nógrád-Gömör Volcanic Field (NGVF) is one of the five mantle xenolith bearing alkaline basalt locations in the Carpathian Pannonian Region. This allows us to constrain the structure and properties (e.g. composition, current deformation state, seismic anisotropy, electrical conductivity) of the upper mantle, including the lithosphere-asthenosphere boundary (LAB) using not only geophysical, but also petrologic and geochemical methods. For this pilot study, eight upper mantle xenoliths have been chosen from Bárna-Nagykő, the southernmost location of the NGVF. The aim of this study is estimating the average seismic properties of the underlying mantle. Based on these estimations, the thickness of the anisotropic layer causing the observed average SKS delay time in the area was modelled considering five lineation and foliation end-member orientations. We conclude that a 142–333 km thick layer is required to explain the observed SKS anisotropy, assuming seismic properties calculated by averaging the properties of the eight xenoliths. It is larger than the thickness of the lithospheric mantle. Therefore, the majority of the delay time accumulates in the sublithospheric mantle. However, it is still in question whether a single anisotropic layer, represented by the studied xenoliths, is responsible for the observed SKS anisotropy, as it is assumed beneath the Bakony–Balaton Highland Volcanic Field (Kovács et al. 2012), or the sublithospheric mantle has different layers. In addition, the depths of the Moho and the LAB (\(25\,\pm \,5, 65\,\pm \,10\,\hbox {km}\), respectively) were estimated based on S receiver function analyses of data from three nearby permanent seismological stations.

Keywords

Seismic anisotropy Mantle xenolith S receiver functions  Lithospheric mantle LAB Moho 

Supplementary material

40328_2014_94_MOESM1_ESM.pdf (4.8 mb)
Supplementary material 1 (pdf 4874 KB)

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Copyright information

© Akadémiai Kiadó 2015

Authors and Affiliations

  • R Klébesz
    • 1
  • Z Gráczer
    • 1
  • Gy Szanyi
    • 1
  • N Liptai
    • 2
  • I Kovács
    • 3
  • L Patkó
    • 2
  • Zs Pintér
    • 2
    • 4
  • Gy Falus
    • 3
  • V Wesztergom
    • 1
  • Cs Szabó
    • 2
  1. 1.Geodetic and Geophysical InstituteMTA Research Centre for Astronomy and Earth SciencesSopronHungary
  2. 2.Lithosphere Fluid Research Lab, Department of Petrology and GeochemistryEötvös UniversityBudapestHungary
  3. 3.Geological and Geophysical Institute of HungaryBudapestHungary
  4. 4.Bayerisches GeoinstitutUniversity of BayreuthBayreuthGermany

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