Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)
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Tartalom: http://real.mtak.hu/27287/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published



Type = Article
Cím:
Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)
Létrehozó:
Klébesz, Rita
Gráczer, Zoltán
Szanyi, Gyöngyvér
Liptai, Nóra
Kovács, István János
Patkó, Levente
Pintér, Zsanett
Falus, György
Wesztergom, Viktor
Szabó, Csaba
Dátum:
2015
Téma:
QE01 Geophysics / geofizika
QE02 Geochemistry / geokémia
QE03 Geodynamics / geodinamika
Tartalmi leírás:
TheNógrád-GömörVolcanic 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-Nagyk?o, 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?
333km 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 ± 5, 65 ± 10 km, respectively) were estimated based on S receiver function
analyses of data from three nearby permanent seismological stations.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Klébesz, Rita and Gráczer, Zoltán and Szanyi, Gyöngyvér and Liptai, Nóra and Kovács, István János and Patkó, Levente and Pintér, Zsanett and Falus, György and Wesztergom, Viktor and Szabó, Csaba (2015) Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin). Acta Geodaetica et Geophysica. ISSN 2213-5812
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