Formal definition and description of lithostratigraphic units related to the Miocene silicic pyroclastic rocks outcropping in Northern Hungary: A revision

Lukács, Réka; Harangi, Szabolcs; Gál, Péter; Szepesi, János; Capua, Andrea Di; Norini, Gianluca; Sulpizio, Roberto; Groppelli, Gianluca; Fodor, László

doi:10.31577/geolcarp.73.2.3

Cited by 10 publications

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“…The boundary between the 3 rd and the 4 th sample area is the widest stream valley in the Bükkalja, the Eger Valley. Here, the Bogács ignimbrite is not observed, and the LPC and UPC (Upper Pyroclastic Complex sensu Szakács, A. et al 1998; see Figure 2) are not clearly separated (Lukács, R. et al 2022;Karátson, D. et al 2022). The 4 th sample area is also distinct with respect to the Bouguer anomaly, because it shows a slight positive anomaly like the 2 nd sample area.…”

Section: Methodsmentioning

confidence: 83%

“…et al 2005). The Paleogene-Lower Miocene sedimentary deposits is in turn overlain by a several 100 m-thick pyroclastic succession emplaced between ~18.2-14.3 Ma from dozens of large explosive eruptions of dominantly high-K rhyolitic magmas (Figure 2, Szakács, A. et al 1998;Lukács, R. et al 2018Lukács, R. et al , 2022Karátson, D. et al 2022). The current surface occurrence of the pyroclastic succession is confined to a ~10 x 40 km region with NE-SW elongation.…”

Section: Geomorphology and Geology Of The Bükkalja Volcanic Areamentioning

confidence: 99%

“…The pyroclastic succession of the BVA consists of layers from dozens of eruptive events (see Figure 2, Szakács, A. et al 1998;Lukács, R. et al 2018;Biró, T. et al 2020), which, according to the latest stratigraphic classification, belong successively to the Tihamér Rhyolite Lapilli Tuff, the Bogács Dacite Lapilli Tuff, the Tar Dacite Lapilli Tuff and the Harsány Rhyolite Lapilli Tuff Formation (Lukács, R. et al 2022). The pyroclastic deposits include layers of fallout origin, ignimbrites emplaced from pyroclastic density currents, and subordinately epiclastics formed by the resedimentation of the primary pyroclastic material mostly by fluvial processes (Capaccioni, B. et al 1995;Szakács, A. et al 1998;Lukács, R. et al 2007Lukács, R. et al , 2015Lukács, R. et al , 2018Biró, T. et al 2020;Hencz, M. et al 2021a, b).…”

Section: Geomorphology and Geology Of The Bükkalja Volcanic Areamentioning

confidence: 99%

“…2002). The Bükkalja exposes the thickest (often exceeding 500 m) and most complex succession of silicic pyroclastics of Miocene age in the northern part of the Pannonian Basin (Szakács, A. et al 1998;Lukács, R. et al 2018Lukács, R. et al , 2022. Moreover, the surface occurrence of the Miocene pyroclastics at the Bükkalja is the largest in Northern Hungary, covering an area of about 10 x 40 km (Less, Gy.…”

Section: Introductionmentioning

confidence: 99%

“…et al 1995;Szakács, A . et al 1998;Lukács, R. et al 2007Lukács, R. et al , 2015Lukács, R. et al , 2018Lukács, R. et al , 2022Biró, T. et al 2020;Hencz, M. et al 2021a, b;Karátson, D. et al 2022).…”

Section: Introductionunclassified

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The relationship between ignimbrite lithofacies and topography in a foothill setting formed on Miocene pyroclastics – a case study from the Bükkalja, Northern Hungary

et al. 2022

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Units with extremely variable erodibility are typical in the succession of pyroclastic-dominated volcanic fields. Welded ignimbrites are usually resistant to erosion, thus, they often appear as positive landforms, i.e., mesas or tilted plateaus after millions of years of denudation. The Bükkalja Volcanic Area being part of the most extended foothill area of the North Hungarian Mountains, is composed predominantly of Miocene ignimbrites, where the frequency distributions of elevation a.s.l., slope, aspect, as well as topographic openness, were investigated using a 30 m resolution SRTM-based digital surface model at four sample areas located at different relative distances from the assumed source localities of the ignimbrites, showing both non-welded and welded facies. The degree of dissection was also examined along swath profiles. The topography of the sample area closest to the source localities is dominated by slabs of moderately dissected welded ignimbrites, gently dipping towards SE. Farther away from the source the topography is dominated by erosional valleys and ridges, resulting in a narrower typical elevation range, a higher proportion of pixels with greater than 5° slope, higher frequencies of NE and SW exposures, and more significant incision resulted in more frequent pixels with positive topographic openness less than 1.5 radians here. Higher thicknesses and emplacement temperatures of ignimbrites, often showing welded facies are more common closer to the source vent. Thus, the erosional pattern around calderas can be used to draw conclusions on the spatial extent of the most intense ignimbrite accumulation, i.e., the location of eruption centres even in highly eroded ignimbrite fields.

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Section: Methodsmentioning

confidence: 83%

Section: Geomorphology and Geology Of The Bükkalja Volcanic Areamentioning

confidence: 99%