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Publications (46)
This study reveals the structural hydroxyl content in clinopyroxenes of three cumulate xenoliths from the Nógrád‐Gömör/Novohrad‐Gemer Volcanic Field (northern Pannonian Basin), with values ranging from 275 to 384 ppm. Based on these data, the water content of the equilibrium parental alkali basaltic melt was estimated to be between 1.5 and 2.1 wt.%...
In planning a magnetotelluric survey, there are several requirements to consider in order to record high-quality electromagnetic time series for geological investigation. In this paper, we present an example of a magnetotelluric field survey recently conducted in the Nógrád–Gömör Volcanic Field (Northern Pannonian Basin) during the summer of 2024,...
The Nógrád–Gömör Volcanic Field is one of the most thoroughly studied upper mantle xenolith-bearing localities in the Carpathian–Pannonian region. Dozens of upper mantle xenoliths collected there have been investigated from various aspects in the past decades. Major element compositions of upper mantle xenoliths available in scientific papers on th...
In this study, we performed high resolution 3D Raman mapping on primary multiphase fluid inclusions from a granulite and an eclogite of the Cabo Orte-gal Complex (NW Spain), the latter representing a former subduction zone environment. Several microns-sized inclusions are great targets to test the advantages and limitations of 3D Raman mapping. We...
Amphiboles in the upper mantle (most frequently pargasitic in composition) have recently gained attention due to their role in the water budget and potential control on the rheology and physical discontinuity layers of the mantle. Although nominally anhydrous minerals are often analyzed with Fourier-transform infrared (FTIR) spectroscopy, amphibole...
Single-lithology and composite xenoliths from Mindszentkálla (Bakony-Balaton Highland Volcanic Field) in the Carpathian-Pannonian region record geochemical evolution of the subcontinental lithospheric mantle. The dominant single-lithology xenoliths are orthopyroxene-rich (22 vol% on average) harzburgites. Three composite xenoliths contain either tw...
Apart from the lithosphere-asthenosphere boundary (LAB), mid-lithospheric discontinuities (MLDs) in thick and old continental lithospheres appear to play an important role in global plate tectonics. Initiation of intra-continental subduction, delamination of the lower continental lithospheric mantle and removal of cratonic roots are likely to occur...
Sulfides from lherzolite and wehrlite xenoliths from the Nógrád-Gömör Volcanic Field (NGVF), located in the Northern Pannonian Basin, were studied to understand the behavior of chalcophile and siderophile elements during mafic melt – peridotite interaction. We applied in situ methods to analyze the major and trace elements, as well as Fe isotope co...
Silicate melt inclusions (SMI) containing several daughter minerals, residual glass, and a CO 2 bubble were analyzed to constrain the composition and evolution of the metasomatic melt present in the upper mantle beneath the Nógrád-Gömör Volcanic Field (NGVF), northern Hungary to southern Slovakia. The SMI were analyzed with a combination of Raman s...
Silicate melt inclusions (SMI) containing several daughter minerals, residual glass, and a CO2 bubble were analyzed to constrain the composition and evolution of the metasomatic melt present in the upper mantle beneath the Nógrád-Gömör Volcanic Field (NGVF), northern Hungary to southern Slovakia. The SMI were analyzed with a combination of Raman sp...
Long period magnetotelluric (MT) data were collected at 14 locations along a ~50 km long NNW-SSE profile in the Nógrád-Gömör Volcanic Field (NGVF), which is one of the five mantle xenolith bearing Neogene alkali basalt locations in the Carpathian-Pannonian region. As a result, a low resistivity anomaly (<10 Ωm) was observed approximately at 30–60 k...
The Styrian Basin is located at the westernmost part of the Carpathian-Pannonian region, in the transition zone between the Pannonian Basin and the Eastern Alps. The lithospheric mantle beneath the Styrian Basin (SB) was sampled by Plio-Pleistocene alkali basalts, which brought mantle xenoliths to the surface. Mantle xenoliths from the SB are mostl...
Incorporation of hydrogen as structural hydroxyl (commonly referred to as water) in nominally anhydrous mantle minerals is known for the ‘hydrolytic weakening’ effect, which decreases the strength and electrical resistivity of the rock. Recent models have provided means of calculating rheological properties from geochemical data of upper mantle xen...
In this study, three clinopyroxene-enriched upper mantle xenoliths, petrographically classified as wehrlite, were investigated from the Nógrád-Gömör Volcanic Field with the use of X-ray microtomography. Our main goal was to quantify the volume of the glass phase and the vesicles to reveal their three-dimensional distribution. Among the studied wehr...
We present a new model for the formation of Plio-Pleistocene alkaline basalts in the central part of the Carpathian-Pannonian region (CPR). Based on the structural hydroxyl content of clinopyroxene megacrysts, the 'water' content of their host basalts is 2.0-2.5 wt.%, typical for island arc basalts. Likewise, the source region of the host basalts i...
By studying mantle xenoliths we can obtain direct information about the chemical and physical state of the lithospheric mantle. With this information, some important geophysical properties (e.g. seismic velocity, conductivity and effective viscosity) can be calculated, which provide a tool to better understand the evolution of the studied region. I...
Clinopyroxene-enriched upper mantle xenoliths classified as wehrlites are common (~20% of all xenoliths) in the central part of the Nógrád-Gömör 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 wehrl...
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...
The structural hydroxyl content of the nominally anhydrous minerals (olivine and pyroxenes) in the upper mantle is among the important attributes that influence the physical and chemical features of the upper mantle. In this study, we provide detailed Fourier-transform infrared (FTIR) data on 63 petrographically and geochemically well-defined upper...
The Nógrád-Gömör Volcanic Field (NGVF) is located in the northern part of the Pannonian Basin, and is one of the five xenolith-bearing alkali basalt occurrences in the region. In NGVF, a lherzolite and a wehrlite series were distinguished based on petrographic and geochemical investigations. The lherzolites represent precursors for the metasomatic...
The aim is to give an overview on how geochemical and petrological data, obtained from
upper mantle xenoliths, could be utilized to provide information on the geophysical properties of the upper mantle at their origin. First we demonstrate how a tentative lithospheric column may be constructed based on the equilibrium temperature of upper mantle xe...
A Kárpát–Pannon régió " tercier " bazaltvulkanizmusának ere-dete mai napig a hazai kőzettani és geokémiai kutatások kihívá-sokkal teli kérdése (l. Szabó et al., 1992; Embey-Isztin et al., 1993; Seghedi et al., 2004; Harangi et al., 2015). A legfontosabb kérdés az, hogy mi okozza az olvadást a földköpenyben (legnagyobbrészt az asztenoszférában) és a...
The Nógrád-Gömör Volcanic Field (NGVF) is located in the northern part of the Pannonian Basin, and is one of the five known xenolith bearing alkaline basalt occurrences in the region. In addition to the dominant lherzolites, great number of wehrlite xenoliths with unique textural and geochemical features have also been recognized. According to our...
Peridotite xenoliths from the Nógrád–Gömör Volcanic Field (NGVF) record the geochemical evolution of the subcontinental lithospheric mantle beneath the northern margin of the Pannonian Basin. This study is focused on spinel lherzolites and presents petrography, and major and trace element geochemistry for 51 xenoliths selected from all xenolith-bea...
The Nógrád-Gömör Volcanic Field (NGVF) is situated in the northern part of the Pannonian Basin, and
is one of the five known xenolith bearing Plio-Pleistocene alkaline basalt occurrences in the region.
In addition to the dominant lherzolites, a great number of wehrlite xenoliths, with particular textural
and geochemical features, have also been col...
Plio-Pleistocene alkali basaltic volcanism sampled sporadically the upper mantle beneath the Carpathian-
Pannonian Region (CPR, e.g. [1]). Lavas and pyroclasts often contain mantle derived xenoliths, and the majority
of them have been extensively studied [1], except the westernmost Styrian Basin Volcanic Field (SBVF, Eastern
Austria and Slovenia)....
We carried out detailed petrographic, major and trace element geochemical, microstructural and FTIR analyses on eight characteristic ultramafic xenoliths from Nyos and Barombi Mbo Lakes in the continental sector of the Cameroon Volcanic Line (CVL). The studied xenoliths are spinel lherzolites showing lithologies similar to the other xenoliths repor...
The Nógrád-Gömör Volcanic Field (NGVF) is one of the five mantle xenolith bear-ing alkaline basalt locations in the Carpathian Pannonian Region. This allows us to constrain the structure and properties (e.g. composition, current deformation state, seismic anisotropy, electrical conductivity) of the upper mantle, including the lithosphere-asthenosph...
We have carried out detailed petrographic, petrophysical (EBSD), geochemical and fluid inclusion study (e.g. Raman, FTIR coupled synchrotron radiation, FIB) on spinel lherzolite xenoliths from Barombi Mbo (BM) and Nyos Lake (from Cameroon Volcanic Line) coupled with study of the water content of their nominally anhydrous minerals (NAMs). Results in...
There are several localities in the Carpathian-Pannonian region where
Plio-Pleistocene alkali basalts lavas and pyroclasts on the surface
contain ultramafic xenoliths originating from the upper mantle. One of
these occurrences is the Nógrád-Gömör Volcanic
Field which is located in the northern part of the Pannonian Basin.
Xenoliths from this area h...
The Nógrád-Gömör Volcanic Field is situated in
the northern part of the Pannonian Basin, where Plio-Pleistocene
alkaline basalts brought upper mantle xenoliths to the surface. We
collected great number of ultramafic xenoliths from the central part of
the region, Medves-plateau (Eresztvény, Magyarbánya) and
Baby hill (Ratka, Filakovske Kovace, Terbe...
Detailed geochemical and deformation analysis of numerous of mantle
xenoliths from the Carpathian-Pannonian region revealed that the present
lithosphere, which suffered significant thinning in the Miocene, may be
divided into two major layers based on the equilibrium temperatures as
indicators for the depth of origin. The shallower layer, from the...
