Metasomatism-induced wehrlite formation in the upper mantle beneath the Nograd-Gomor Volcanic Field (Northern Pannonian Basin): Evidence from xenoliths

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dc.contributor.authorPatko, Leventeen
dc.contributor.authorLiptai, Noraen
dc.contributor.authorAradi, Laszlo Eloden
dc.contributor.authorKlébesz, Ritaen
dc.contributor.authorSendula, Eszteren
dc.contributor.authorBodnar, Robert J.en
dc.contributor.authorKovacs, Istvan Janosen
dc.contributor.authorHidas, Karolyen
dc.contributor.authorCesare, Bernardoen
dc.contributor.authorNovak, Attilaen
dc.contributor.authorTrasy, Balazsen
dc.contributor.authorSzabo, Csabaen
dc.contributor.departmentGeosciencesen
dc.date.accessioned2020-08-26T12:54:52Zen
dc.date.available2020-08-26T12:54:52Zen
dc.date.issued2020-05en
dc.description.abstractClinopyroxene-enriched upper mantle xenoliths classified as wehrlites are common (similar to 20% of all xenoliths) in the central part of the Nograd-Gomor Volcanic Field (NGVF), situated in the northern margin of the Pannonian Basin in northern Hungary and southern Slovakia. In this study, we thoroughly investigated 12 wehrlite xenoliths, two from each wehrlite-bearing occurrence, to determine the conditions of their formation. Specific textural features, including clinopyroxene-rich patches in an olivine-rich lithology, orthopyroxene remnants in the cores of newly-formed clinopyroxenes and vermicular spinel forms all suggest that wehrlites were formed as a result of intensive interaction between a metasomatic agent and the peridotite wall rock. Based on the major and trace element geochemistry of the rock-forming minerals, significant enrichment in basaltic (Fe, Mn, Ti) and high field strength elements (Nb, Ta, Hf, Zr) was observed, compared to compositions of common lherzolite xenoliths. The presence of orthopyroxene remnants and geochemical trends in rock-forming minerals suggest that the metasomatic process ceased before complete wehrlitization was achieved. The composition of the metasomatic agent is interpreted to be a mafic silicate melt, which was further confirmed by numerical modelling of trace elements using the plate model. The model results also show that the melt/rock ratio played a key role in the degree of petrographic and geochemical transformation. The lack of equilibrium and the conclusions drawn by using variable lherzolitic precursors in the model both suggest that wehrlitization was the last event that occurred shortly before xenolith entrainment in the host mafic melt. We suggest that the wehrlitization and the Plio-Pleistocene basaltic volcanism are related to the same magmatic event.en
dc.description.notesThe authors would like to thank many people who supported the compilation of this work. Zsolt Bendo and Zoltan Kovacs are thanked for helping with SEM analyses at Eotvos University. We are also grateful to Anna Maria Fioretti and Raul Carampin for their help with EMPA analyses in Padua, Italy. We acknowledge Luca Fedele and Pilar Lecumberri Sanchez for their help with LA-ICP-MS measurements at Virginia Tech. This research was financially facilitated by Orlando Vaselli, supported by the Bolyai Postdoctoral Fellowship Program, a Marie Curie International Reintegration Grant (Grant No. NAMS-230937) and a postdoctoral grant (Grant No. PD101683) of the Hungarian Scientific Research Found (OTKA) to I. J. K., as well as a grant of the Hungarian Scientific Research Found (Grant No. 78425) to Cs. Sz. Work done at Virginia Tech was supported by a grant from the U.S. National Science Foundation (EAR-1624589) to R. J. B. L. Patko was supported by the GINOP-2.3.2-15-2016-00009 research program. This is the 88 publication of the Lithosphere Fluid Research Lab (LRG).en
dc.description.sponsorshipMarie Curie International Reintegration GrantEuropean Union (EU) [NAMS-230937]; Hungarian Scientific Research Found (OTKA)Orszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [PD101683]; Hungarian Scientific Research FoundOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [78425]; U.S. National Science FoundationNational Science Foundation (NSF) [EAR-1624589]; Bolyai Postdoctoral Fellowship Program; [GINOP-2.3.2-15-2016-00009]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.gsf.2019.09.012en
dc.identifier.issn1674-9871en
dc.identifier.issue3en
dc.identifier.urihttp://hdl.handle.net/10919/99854en
dc.identifier.volume11en
dc.language.isoenen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectWehrlite xenolithsen
dc.subjectUpper mantle metasomatismen
dc.subjectMafic silicate melten
dc.subjectTrace element modellingen
dc.titleMetasomatism-induced wehrlite formation in the upper mantle beneath the Nograd-Gomor Volcanic Field (Northern Pannonian Basin): Evidence from xenolithsen
dc.title.serialGeoscience Frontiersen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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