Multiple Metasomatism beneath the Nógrád–Gömör Volcanic Field (Northern Pannonian Basin) Revealed by Upper Mantle Peridotite Xenoliths

Liptai, Nóra; Patkó, Levente; Kovàcs, István; Hidas, Károly; Pintér, Zsanett; Jeffries, Teresa; Zajacz, Zoltán; O’Reilly, Suzanne Y.; Griffin, William L.; Pearson, Norman J.; Szabó, Csaba

doi:10.1093/petrology/egx048

Cited by 26 publications

(57 citation statements)

References 101 publications

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“…The SSVF basalts span compositions from basanite through basaltic trachyandesite to phonotephrite. Trace element distribution patterns and radiogenic isotopes in the basalts (Embey-Isztin and Dobosi 1995) combined with those in mantle xenoliths (Downes and Vaselli 1995;Liptai et al 2017) reflect a 7-25 % partial melting of spinel-bearing mantle source with basalt compositions locally affected by the enriched (metasomatized) mantle.…”

Section: Geological Settingmentioning

confidence: 99%

Origin and provenance of 2 Ma–2 Ga zircons ejected by phreatomagmatic eruptions of Pliocene basalts in southern Slovakia

Paquette

Huraiová

Nemec

et al. 2019

Int J Earth Sci (Geol Rundsch)

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U-Pb ages of zircons recovered from Pliocene pyroclastic deposits in northern part of the Cenozoic intra-Carpathian back-arc basin (Pannonian Basin) span the interval from Pliocene (2.2 Ma) to Paleoproterozoic (Orosirian-Rhyacian, 1850-2115 Ma). The scattered U-Pb ages reflect eruption ages of the host basaltic volcanic centres, two episodes of post-Eocene magmatic crustal growth, and the possible tectonic affiliation, provenance and age of the subjacent basement or the sedimentary basin detritus sampled by the basaltic magma. The youngest zircons define maximum ages of phreatomagmatic eruptions during the Late Miocene-Pliocene extension. These zircons are distinguished from older zircons by Zr/Hf (40-90) and Th/U ratios (0.5-4.5) as well as super-chondritic εHf(t) values ranging from +7 to +14, indicating mantle-derived parental magmas. The locally increased Th/U ratios (up to 8) accompanied by Zr/Hf >60 are diagnostic of evolved phonolite parental melt. Hence, the youngest zircons can be interpreted as antecrysts, originating from evolved melts cogenetic zircons have been likely scavenged from pyroclastic and ash-fall deposits of the Palaeogene retroarc basin subjacent to the Miocene basin infilling. Sub-chondritic εHf(t) values between-2.5 and-8 in the Eocene-Early Miocene zircons attest their crystallization from subductionrelated felsic-to-intermediate melts containing large amounts of recycled crustal material. Palaeozoic-Proterozoic zircons create a heterogeneous population with variable trace element abundances and εHf(t) values. The determined age clusters are reminiscent of some basement units cropping out recently in Central Western Carpathians. Zircon Hf isotope data indicate recycling of up to 3.4 Ga old mafic crust and also the presence of 2 Ga old juvenile mafic crust. These units had either underlain the northern part of the Pannonian Basin during Pliocene, or had been exposed during the deposition of Miocene clastic sediments. The absence of Mesoproterozoic, Grenvillian zircons (0.9-1.8 Ga) in the pre-Cenozoic population of zircon xenocrysts is provisionally interpreted as indicating the evolution of the zircon source area within the west-African Craton.

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Section: Geological Settingmentioning

confidence: 99%

Origin and provenance of 2 Ma–2 Ga zircons ejected by phreatomagmatic eruptions of Pliocene basalts in southern Slovakia

Paquette

Huraiová

Nemec

et al. 2019

Int J Earth Sci (Geol Rundsch)

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“…The low Ca‐in‐opx equilibration temperatures of the equigranular peridotites in the southern domain contrast with their well‐annealed microstructures. These xenoliths record nevertheless significantly higher REE‐based equilibration temperatures (Figure e), which are interpreted to represent older, hotter mantle conditions, probably linked to the Miocene extension and asthenospheric uplift (Liptai et al, ). We interpret therefore these microstructures as recording deformation and annealing in the shallow lithospheric mantle related to the Miocene extension, which was followed by cooling.…”

Section: Discussionmentioning

confidence: 96%

Lateral and Vertical Heterogeneity in the Lithospheric Mantle at the Northern Margin of the Pannonian Basin Reconstructed From Peridotite Xenolith Microstructures

et al. 2019

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This study analyzes the microstructures and deformational characteristics of spinel peridotite xenoliths from the Nógrád-Gömör Volcanic Field (NGVF), located on the northern margin of a young extensional basin presently affected by compression. The xenoliths show a wide range of microstructures, bearing the imprints of heterogeneous deformation and variable degrees of subsequent annealing. Olivine crystal preferred orientations (CPOs) have dominantly [010]-fiber and orthorhombic patterns. Orthopyroxene CPOs indicate coeval deformation with olivine. Olivine J indices correlate positively with equilibration temperatures, suggesting that the CPO strength increases with depth. In contrast, the intensity of intragranular deformation in olivine varies as a function of the sampling locality. We interpret the microstructures and CPO patterns as recording deformation by dislocation creep in a transpressional regime, which is consistent with recent tectonic evolution in the Carpathian-Pannonian region due to the convergence between the Adria microplate and the European platform. Postkinematic annealing is probably linked to percolation of metasomatism by mafic melts through the upper mantle of the NGVF prior to the eruption of the host alkali basalt. Elevated equilibration temperatures in xenoliths from the central part of the volcanic field are interpreted to be associated with the last metasomatic event, which only shortly preceded the ascent of the host magma. Despite well-developed olivine CPOs in the xenoliths, which imply a strong seismic anisotropy, the lithospheric mantle alone cannot account for the shear wave splitting delay times measured in the NGVF, indicating that deformation in both the lithosphere and the asthenosphere contributes to the observed shear wave splitting.

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“…Many studies analyzed xenoliths from volcanic fields both at the margins and the central part of the CPR (Figure a). In the western and northern margins, xenoliths from localities in the Styrian Basin Volcanic Field (e.g., Coltorti et al, ; Dobosi et al, ; Kurat et al, ; Vaselli et al, ) and in the Nógrád‐Gömör Volcanic Field (e.g., Embey‐Isztin, ; Konecný et al, ; Liptai et al, ; Szabó & Taylor, ) have been studied. In the eastern margin, xenoliths from the Persani Mountains Volcanic Field (e.g., Chalot‐Prat & Boullier, ; Falus et al, ; Vaselli et al, ) were studied.…”

Section: Introductionmentioning

confidence: 99%

Fluid‐Enhanced Annealing in the Subcontinental Lithospheric Mantle Beneath the Westernmost Margin of the Carpathian‐Pannonian Extensional Basin System

et al. 2017

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Mantle xenoliths from the Styrian Basin Volcanic Field (Western Pannonian Basin, Austria) are mostly coarse granular amphibole‐bearing spinel lherzolites with microstructures attesting for extensive annealing. Olivine and pyroxene CPO (crystal‐preferred orientation) preserve nevertheless the record of coeval deformation during a preannealing tectonic event. Olivine shows transitional CPO symmetry from [010]‐fiber to orthogonal type. In most samples with [010]‐fiber olivine CPO symmetry, the [001] axes of the pyroxenes are also dispersed in the foliation plane. This CPO patterns are consistent with lithospheric deformation accommodated by dislocation creep in a transpressional tectonic regime. The lithospheric mantle deformed most probably during the transpressional phase after the Penninic slab breakoff in the Eastern Alps. The calculated seismic properties of the xenoliths indicate that a significant portion of shear wave splitting delay times in the Styrian Basin (0.5 s out of approximately 1.3 s) may originate in a highly annealed subcontinental lithospheric mantle. Hydroxyl content in olivine is correlated to the degree of annealing, with higher concentrations in the more annealed textures. Based on the correlation between microstructures and hydroxyl content in olivine, we propose that annealing was triggered by percolation of hydrous fluids/melts in the shallow subcontinental lithospheric mantle. A possible source of these fluids/melts is the dehydration of the subducted Penninic slab beneath the Styrian Basin. The studied xenoliths did not record the latest large‐scale geodynamic events in the region—the Miocene extension then tectonic inversion of the Pannonian Basin.

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Multiple Metasomatism beneath the Nógrád–Gömör Volcanic Field (Northern Pannonian Basin) Revealed by Upper Mantle Peridotite Xenoliths

Cited by 26 publications

References 101 publications

Origin and provenance of 2 Ma–2 Ga zircons ejected by phreatomagmatic eruptions of Pliocene basalts in southern Slovakia

Origin and provenance of 2 Ma–2 Ga zircons ejected by phreatomagmatic eruptions of Pliocene basalts in southern Slovakia

Lateral and Vertical Heterogeneity in the Lithospheric Mantle at the Northern Margin of the Pannonian Basin Reconstructed From Peridotite Xenolith Microstructures

Fluid‐Enhanced Annealing in the Subcontinental Lithospheric Mantle Beneath the Westernmost Margin of the Carpathian‐Pannonian Extensional Basin System

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