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Metasomatism-induced wehrlite formation in the upper mantle beneath the Nógrád-G?m?r Volcanic Field(Northern Pannonian Basin):Evidence from xenoliths

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Geoscience Frontiers 2020年第3期11卷 943-964页

作者： Levente Patko Nora Liptai Laszlo Elod Aradi Rita Klebesz Eszter Sendula Robert J.Bodnar Istvan Janos Kovacs Karoly Hidas Bernardo Cesare Attila Novak balazs trasy Csaba Szabo Lithosphere Fluid Research Lab Institute of Geography and Earth SciencesEotvos Lor and UniversityBudapestHungary Isotope Climatology and Environmental Research Centre Institute for Nuclear ResearchHungarian Academy of SciencesDebrecenHungary CCFS-GEMOC Department of Earth and Planetary SciencesMacquarie UniversitySydneyAustralia Geodetic and Geophysical Institute Research Centre for Astronomy and Earth SciencesHungarian Academy of SciencesSopronHungary Fluids Research Laboratory Department of GeosciencesVirginia TechBlacksburgVAUnited States MTA CSFK Lendület Pannon LitH2Oscope Research Group Geodetic and Geophysical InstituteResearch Centre for Astronomy and Earth SciencesHungarian Academy of SciencesSopronHungary Instituto Andaluz de Ciencias de La Tierra CSIC&UGRArmillaGranadaSpain Department of Geosciences University of PaduaPaduaItaly Department of Geology Eotvos Lorand UniversityBudapestHungary

Clinopyroxene-enriched upper mantle xenoliths classified as wehrlites are common(~20% of all xenoliths) in the central part of the Nograd-G(o| ")m(o|")r Volcanic Field(NGVF),situated in the northern margin of the Pannonian Basin in northern Hungary and southern *** this study,we thoroughly investigated 12 wehrlite xenoliths,two from each wehrlite-bearing occurrence,to determine the conditions of their *** textural features,including clinopyroxene-rich patches in an olivine-rich lithology,orthopyroxene remnants in the cores of newlyformed 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 *** 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 *** presence of orthopyroxene remnants and geochemical trends in rock-forming minerals suggest that the metasomatic process ceased before complete wehrlitization was *** 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 results also show that the melt/rock ratio played a key role in the degree of petrographic and geochemical *** 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 *** suggest that the wehrlitization and the Plio-Pleistocene basaltic volcanism are related to the same magmatic event.

关键词： Wehrlite xenoliths Upper mantle metasomatism Mafic silicate melt Trace element modelling

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