RT info:eu-repo/semantics/article
T1 A Miocene Phreatoplinian eruption in the North-Eastern Pannonian Basin, Hungary: The Jató Member
A1 Biró, Tamás
A1 Hencz, Mátyás
A1 Németh, Károly
A1 Karátson, Dávid
A1 Márton, Emő
A1 Szakács, Alexandru
A1 Bradák, Balázs
A1 Szalai, Zoltán
A1 Pécskay, Zoltán
A1 Kovács, István János
K1 Silicic hydrovolcanism
K1 Accretionary lapilli
K1 Dry-to-wet transition
K1 Miocene
K1 Bükk Foreland Volcanic Area
K1 Carpatho-Pannonian region
K1 Geología
K1 Geology
K1 Física
K1 Physics
AB A Middle Miocene, ~8 m thick pyroclastic succession, reported from the Bükk Foreland Volcanic Area (BFVA) inNorthern Hungary (Central Europe) specified here as the Jató Member, was produced by silicicphreatomagmatism (Phreatoplinian sensu lato). Two well-preserved outcrops ~8 km apart and inferred to bewithin ~10–50 km from source represent the discontinuously exposed, layered, paleosol-bounded,phreatomagmatic JatóMember. They show an identical phenocrystal assemblage of feldspar, biotite and amphibolewithout weathered zones or signs of erosion, that suggest deposition in one eruption phase lasting hours tomonths. The succession contains three subunits: 1) subunit A, 1.8 m thick, a series of well-sorted fine to coarseash or lapilli tuff layers with constant thickness; 2) subunit B, 2.1 m thick, a series of normal-graded layerswith an upper fine-grained zone containing abundant ash aggregates with a coarser-grained core and distinctivelyfiner-grained outer rim; 3) subunit C, 4.5 m thick, a massive, poorly to well-sorted coarse ash with gas escapestructures and ash aggregates at its base. The upward change of these lithofacies implies an initiallysustained dry fallout-dominated deposition of ash and pumice lapilli resulting in subunit A. Subsequently, multiplewet and dilute Pyroclastic Density Currents (PDCs) dispersed subunits B and C. The general abundance ofPDC-related ash aggregates in the middle-upper part of the succession (particularly in subunit B), and the transformationof a fall-dominated to a collapsing depositional regime producing wet dilute PDCs, imply the increasinginfluence of water during the eruption (Phreatoplinian sensu lato). The presence of water is related to anepicontinental sea duringMiddle to LateMiocene in the Carpatho-Pannonian region. The transition from an initialdry magmatic phase generated fallout activity followed by the emplacement of wet PDCs' rich in ash aggregates,when external water infiltrated from a surrounding lake or sea water entered the vent.
PB Elsevier
SN 0377-0273
YR 2020
FD 2020-09
LK http://hdl.handle.net/10259/6096
UL http://hdl.handle.net/10259/6096
LA eng
NO ÚNKP-16-3New National Excellence Program of the Ministry of Human Capacitiesand the National Talent Program – Young Talents of the Nation (NTPNFTÖ-18-B-0130). Thisworkwas supported by theHungarian ScientificResearch Fund project nos. K105245, K115472, K128625, K131894,K128122 and by the European Union and the State of Hungary, cofinancedby the European Regional Development Fund in the projectof GINOP - 2.3.2 - 15 - 2016 - 00009 ICER. KN's contribution and fieldwork were possible by the fund available under the Erasmus+ InternationalCredit Mobility, - ELTE –Massey University Research CooperationProgram. Balázs Bradák acknowledges the financial support of projectBU235P18 (Junta de Castilla y León, Spain) and the European RegionalDevelopment Fund (ERD).
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024