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  • 1 Laboratory for Geochemical Research, Hungarian Academy of Sciences, Budapest H-1112 Budapest, Budaörsi út 45, Hungary
  • | 2 Hungarian Geological Survey, Budapest H-1143 Budapest, Stefánia út 14, Hungary
  • | 3 Institute of Geodynamics, Romanian Academy, Bucharest 19-21, Jean-Louis Calderon Str., 70201 Bucharest 37, Romania
  • | 4 Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4026 Debrecen, Bem tér 18/c, Hungary
  • | 5 Palaeomagnetic Laboratory, Eötvös Loránd Geophysical Institute of Hungary, Budapest H-1145 Budapest, Columbus u. 17-23, Hungary
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New K/Ar ages and paleomagnetic data connected with volcano-tectonic observations detected three intermediate (andesitic) and three acidic (dacitic-rhyolitic) magmatic phases. Cserhát magmatic activity occurred between 21-12 Ma. The timing of the initial and final acidic and intermediate phases may be connected with the Mátra volcano situated to the east. During the Badenian (15-14 Ma) the volcano-tectonic evolution was relatively independent in the Cserhát Mts. The third acidic and intermediate volcanic phases, which developed in the Lower Sarmatian, show similar features as the final phases of the Mátra volcano. Based on the major and trace element geochemistry the acidic rocks result from partial melting of the lower crust. Most of the intermediate volcanic rocks were generated from a rather homogeneous fluid-modified source (lithospheric), as triggered by an important heat transfer event. Initial melts sometimes experienced mixing or contamination in the lower or upper crust. This was a period of strong extensive tectonics. The rock of the second and third intermediate phases suggests minor fractional crystallization in the intermediary magma chamber(s).

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