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The upper mantle beneath the Nógrád-Gömör Volcanic Field (Northern Hungary - Southern Slovakia) ? an integrated study on spinel lherzolite xenoliths

Liptai, Nóra

Patkó, Levente

Kovács, István János

Pintér, Zsanett

Hidas, Károly

Tommasi, Andrea

Jeffries, Teresa

Zajacz, Zoltán

Falus, György

Szabó, Csaba

2015

QE02 Geochemistry / geokémia

QE06 Petrology. Petrography / kőzettan, petrográfia

Peridotite xenoliths of the Nógrád-Gömör Volcanic Field (NGVF) record the
geochemical and structural evolution of the lithospheric mantle beneath the northern margin
of the Pannonian basin. We analyzed petrography, major and trace element geochemistry of
mineral constituents, ?water? content of nominally anhydrous minerals (NAMs), and olivine
crystal preferred orientation (CPO) in 17 selected spinel peridotite xenoliths from the central
and southern part of the NGVF. Xenolith textures from the central and southern localities
differ in abundance: porphyroclastic texture predominates in the central part, whereas the
southern part exhibits a wider variety, having a significant ratio of equigranular textures.
Geochemical analyses indicate similar major element contents of minerals with a variability
of Fe- and LREE-enrichment in xenoliths from the central localities, indicating that cryptic
metasomatism has affected the xenoliths to different degrees. This is also supported by
?water? content of pyroxenes, which is generally lower in the southern part than in the central
part. Strength of CPO also varies: porphyroclastic xenoliths from the southern part generally
display weak orthorhombic olivine CPOs, whereas equigranular textures are associated with
axial?[010] olivine CPOs, respectively. On the other hand, all but one xenoliths from the
central part show strong orthorhombic patterns, independently from geochemical features.
Based on these results, we presume that the NGVF xenoliths sampled two geochemically and
rheologically different domains of the upper mantle and have recorded imprints of major
processes such as the Miocene extension and the accompanying melt production, which
occurred during the Neogene evolution of the Pannonian Basin.

Article

NonPeerReviewed

text

http://real.mtak.hu/29459/1/Liptaietal2015Submitted.pdf

Liptai, Nóra and Patkó, Levente and Kovács, István János and Pintér, Zsanett and Hidas, Károly and Tommasi, Andrea and Jeffries, Teresa and Zajacz, Zoltán and Falus, György and Szabó, Csaba (2015) The upper mantle beneath the Nógrád-Gömör Volcanic Field (Northern Hungary - Southern Slovakia) ? an integrated study on spinel lherzolite xenoliths. Journal of Petrology. ISSN 0022-3530, ESSN: 1460-2415 (Submitted)

http://real.mtak.hu/29459/