4.4 Article

Intraplate volcanism in the Danube Basin of NW Hungary: 3D geophysical modelling of the Late Miocene Pasztori volcano

Journal

INTERNATIONAL JOURNAL OF EARTH SCIENCES
Volume 107, Issue 5, Pages 1713-1730

Publisher

SPRINGER
DOI: 10.1007/s00531-017-1567-5

Keywords

Multiphase intraplate volcanism; 3D modelling; Potential fields; Seismic interpretation; Danube Basin

Funding

  1. Slovak Research and Development Agency [APVV-16-0146, APVV-16-0482]
  2. VEGA Slovak Grant Agency [1/0141/15, 2/0042/15]
  3. Hungarian National Fund through the New National Excellence Program of the Ministry of Human Capacities (Hungary) [OTKA 109255K]

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Three-dimensional geophysical modelling of the early Late Miocene Pasztori volcano (ca. 11-10 Ma) and adjacent area in the Little Hungarian Plain Volcanic Field of the Danube Basin was carried out to get an insight into the most prominent intra-crustal structures here. We have used gridded gravity and magnetic data, interpreted seismic reflection sections and borehole data combined with re-evaluated geological constraints. Based on petrological analysis of core samples from available six exploration boreholes, the volcanic rocks consist of a series of alkaline trachytic and trachyandesitic volcanoclastic and effusive rocks. The measured magnetic susceptibilities of these samples are generally very low suggesting a deeper magnetic source. The age of the modelled Pasztori volcano, buried beneath a 2 km-thick Late Miocene-to-Quaternary sedimentary sequence, is 10.4 +/- 0.3 Ma belonging to the dominantly normal C5 chron. Our model includes crustal domains with different effective induced magnetizations and densities: uppermost 0.3-1.8 km thick layer of volcanoclastics underlain by a trachytic-trachyandesitic coherent and volcanoclastic rock units of a maximum 2 km thickness, with a top situated at minimal depth of 2.3 km, and a deeper magmatic pluton in a depth range of 5-15 km. The 3D model of the Danube Basin is consistent with observed high Delta Z magnetic anomalies above the volcano, while the observed Bouguer gravity anomalies correlate better with the crystalline basement depth. Our analysis contributes to deeper understanding of the crustal architecture and the evolution of the basin accompanied by alkaline intraplate volcanism.

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