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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6096

    Título
    A Miocene Phreatoplinian eruption in the North-Eastern Pannonian Basin, Hungary: The Jató Member
    Autor
    Biró, Tamás
    Hencz, Mátyás
    Németh, Károly
    Karátson, Dávid
    Márton, Emő
    Szakács, Alexandru
    Bradák, BalázsUBU authority Orcid
    Szalai, Zoltán
    Pécskay, Zoltán
    Kovács, István János
    Publicado en
    Journal of Volcanology and Geothermal Research. 2020, V. 401, 106973
    Editorial
    Elsevier
    Fecha de publicación
    2020-09
    ISSN
    0377-0273
    DOI
    10.1016/j.jvolgeores.2020.106973
    Abstract
    A Middle Miocene, ~8 m thick pyroclastic succession, reported from the Bükk Foreland Volcanic Area (BFVA) in Northern Hungary (Central Europe) specified here as the Jató Member, was produced by silicic phreatomagmatism (Phreatoplinian sensu lato). Two well-preserved outcrops ~8 km apart and inferred to be within ~10–50 km from source represent the discontinuously exposed, layered, paleosol-bounded, phreatomagmatic JatóMember. They show an identical phenocrystal assemblage of feldspar, biotite and amphibole without weathered zones or signs of erosion, that suggest deposition in one eruption phase lasting hours to months. The succession contains three subunits: 1) subunit A, 1.8 m thick, a series of well-sorted fine to coarse ash or lapilli tuff layers with constant thickness; 2) subunit B, 2.1 m thick, a series of normal-graded layers with an upper fine-grained zone containing abundant ash aggregates with a coarser-grained core and distinctively finer-grained outer rim; 3) subunit C, 4.5 m thick, a massive, poorly to well-sorted coarse ash with gas escape structures and ash aggregates at its base. The upward change of these lithofacies implies an initially sustained dry fallout-dominated deposition of ash and pumice lapilli resulting in subunit A. Subsequently, multiple wet and dilute Pyroclastic Density Currents (PDCs) dispersed subunits B and C. The general abundance of PDC-related ash aggregates in the middle-upper part of the succession (particularly in subunit B), and the transformation of a fall-dominated to a collapsing depositional regime producing wet dilute PDCs, imply the increasing influence of water during the eruption (Phreatoplinian sensu lato). The presence of water is related to an epicontinental sea duringMiddle to LateMiocene in the Carpatho-Pannonian region. The transition from an initial dry 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.
    Palabras clave
    Silicic hydrovolcanism
    Accretionary lapilli
    Dry-to-wet transition
    Miocene
    Bükk Foreland Volcanic Area
    Carpatho-Pannonian region
    Materia
    Geología
    Geology
    Física
    Physics
    URI
    http://hdl.handle.net/10259/6096
    Versión del editor
    https://doi.org/10.1016/j.jvolgeores.2020.106973
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