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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 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)

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Abstract

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.

Item Type: Article
Subjects: Q Science / természettudomány > QE Geology / földtudományok > QE02 Geochemistry / geokémia
Q Science / természettudomány > QE Geology / földtudományok > QE06 Petrology. Petrography / kőzettan, petrográfia
Depositing User: Dr. István János Kovács
Date Deposited: 02 Oct 2015 11:48
Last Modified: 02 Oct 2015 11:48
URI: http://real.mtak.hu/id/eprint/29459

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