Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)

Klébesz, Rita; Gráczer, Zoltán; Szanyi, Gyöngyvér; Liptai, Nóra; Kovàcs, István; Patkó, Levente; Pintér, Zsanett; Falus, György; Wesztergom, Viktor; Szabó, Csaba

doi:10.1007/s40328-014-0094-0

Cited by 16 publications

(30 citation statements)

References 41 publications

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“…Although the studied mantle section from the Styrian Basin shows widespread annealing, the xenoliths still exhibit strong to moderate olivine CPO and, thus, seismic anisotropy (Table and Figure b). We estimated the thickness of the anisotropic layer that could produce the observed shear wave splitting delay times using the average seismic properties of the SB xenoliths (e.g., Ben‐Ismail et al, ; Klébesz et al, ; Kovács, Falus, et al, ; Pera et al, ). As a reference we used the data measured at the seismic station Arzberg, ARSA (d t = 1.27 s; Qorbani et al, ), which is situated ~50 km northwest from the center of the studied area.…”

Section: Discussionmentioning

confidence: 99%

“…Most of these studies focused on the mineral and whole rock major and trace element geochemistry, Nd‐Sr‐Pb isotopes, and silicate melt and fluid inclusions in peridotites and pyroxenites (see Szabó et al, , for a review). Only a few report microstructural and crystal‐preferred orientation (CPO) data (Falus et al, , ; Hidas et al, ; Klébesz et al, ; Kovács, Falus, et al, ; Liptai et al, ). Yet these data are essential for reconstructing the deformation history of the mantle (e.g., Carter & Avé Lallemant, ; Karato et al, ; Tommasi et al, ; Vauchez et al, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

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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“…The APM direction is indicated by the cyan arrow (∼59°N, an average of MOR (MORVEL2010) and HS3‐NNR, see below). The location of xenoliths sample origin is shown by orange symbols; # 1: Szentbaekkala, in the Bakony‐Balaton Highland, BBH; # 2: Little Hungarian Plain, LHP [ Kovács et al , ]; # 3: Nógrád‐Gömör Volcanic field, NGVF [ Klébesz et al , ]. (b) Histogram of the distribution of the fast orientation.…”

Section: Methods and Datamentioning

confidence: 99%

“…In this study we used the petrofabric experimental results of natural rock samples. Samples are basalt‐hosted upper mantle xenoliths taken from the Nógrád‐Gömör Volcanic Field, NGVF [ Klébesz et al , ], and from the Bakony‐Balaton Highland (BBH) and Little Hungarian Plain (LHP) areas [ Kovács et al , , Figure ]. According to prior geochemical and petrological analysis on the BBH and LHP samples, two main groups could be distinguished.…”

Section: Methods and Datamentioning

confidence: 99%

“…The other group of xenoliths—representing the shallower and thin remnants of the lithospheric mantle after the extension—showed relatively weak shear wave anisotropy (3.0–5.3%). Because of the lower degree of anisotropy and very small thickness of this layer (∼10 km [see Kovács et al , ; Klébesz et al , ]), we did not use these data.…”

Section: Methods and Datamentioning

confidence: 99%

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Deformation in the asthenospheric mantle beneath the Carpathian‐Pannonian Region

et al. 2016

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To better understand the evolution and present‐day tectonics of the Carpathian‐Pannonian Region (CPR), we characterize the upper mantle anisotropic structure. We present a shear wave splitting analysis from teleseismic events recorded at the Carpathian Basin Project and permanent stations located in the CPR. The results show a large‐scale uniform NW‐SE fast orientation under the entire CPR. Compared with the complexity of geologic structures, the anisotropy expresses a relatively simple pattern of deformation. We attribute this anisotropy to an asthenospheric origin and interpret it as flow‐induced alignment within the upper mantle. We also observe a few measurements depicting NE‐SW fast orientation in line with the Mid‐Hungarian Shear Zone. This suggests the likely contribution of either lithosphere or northeastward flow into a slab gap under the northern Dinarides. We observe splitting delay times on average of 1 s, showing noticeable change (60%) in the middle Pannonian basin. This change correlates well with the variation in the thickness of low‐velocity zones that were previously imaged between a depth of 75 and 400 km by velocity tomography. In order to evaluate the relation between anisotropy and tectonics, we compare our data with the tectonic models that have so far been suggested to explain the evolution and current‐stage tectonics of the region. We present here a plausible tectonic model responsible for the NW‐SE anisotropy within the asthenospheric mantle. In this model, NW‐SE deformation is mainly generated in a northeastward compressional tectonic regime acting in a wide region between the Adriatic microplate and the East European platform.

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Upper mantle xenoliths as sources of geophysical information: the Perşani Mts. area as a case study

et al. 2018

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Constraints on the thickness and seismic properties of the lithosphere in an extensional setting (Nógrád-Gömör Volcanic Field, Northern Pannonian Basin)

Cited by 16 publications

References 41 publications

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

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

Deformation in the asthenospheric mantle beneath the Carpathian‐Pannonian Region

Upper mantle xenoliths as sources of geophysical information: the Perşani Mts. area as a case study

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