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Erupt-spread-emplace-modify: Fate and weight of the Carpathian-Pannonian Region silicic volcanism during Early and Middle Miocene

Mihovil Brlek 1, Nina Trinajstić1, Sean P. Gaynor2, Steffen Kutterolf3, Julie Schindlbeck-Belo3, Folkmar Hauff3, Sanja Šuica4,5, Vlatko Brčić1, Kuo-Lung Wang6,7, Hao-Yang Lee6, Matija Vukovski1, Sava Markovic8, Elena Watts9, Francisco Apen10, Ivan Mišur1, Duje Kukoč1, Dawid Szymanowski8, Svetoslav V. Georgiev11, Elizabeth Niespolo9, Blair Schoene9, Réka Lukács12, 13

  • Affiliations: 1Croatian Geological Survey, Department of Geology, Sachsova 2, HR-10000 Zagreb, Croatia; 2U.S. Geological Survey, Geology, Geophysics, and Geochemistry Science Center, Denver, 80225, USA; 3GEOMAR Helmholtz Centre for Ocean Research Kiel, FB4, Dynamics of the Ocean Floor, Wischhofstrasse 1-3, D-24148 Kiel, Germany; 4INA-Industrija nafte, d.d., Rock and Fluid Analysis, Lovinčićeva 4, HR-10000 Zagreb, Croatia; 5University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102a, Zagreb HR-10000, Croatia; 6Institute of Earth Sciences, Academia Sinica, 128 Academia Road Sec. 2, Nangang, Taipei 115, Taiwan; 7Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan; 8Institute of Geochemistry and Petrology, ETH Zürich, 8092 Zürich, Switzerland; 9Department of Geosciences, Guyot Hall, Princeton University, New Jersey, 08544, USA; 10School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ 86011, USA; 11Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria; 12HUN-REN-ELTE Volcanology Research Group, Budapest Pázmány Péter Sétány 1/C, 1117 Budapest, Hungary; 13Institute for Geological and Geochemical Research, HUN-REN Research Centre for Astronomy and Earth Sciences (MTA Centre of Excellence), Budaörsi út 45, 1112 Budapest, Hungary 

  • Presentation type: Talk

  • Presentation time: Tuesday 09:45 - 10:00, Room S150

  • Programme No: 3.13.6

  • Theme 3 > Session 13

Abstract

Explosive silicic volcanism of the Carpathian-Pannonian Region (CPR) is increasingly recognized as the primary source of tephra across the Alpine-Mediterranean region (AMR) during Early and Middle Miocene. This calls for a unified tephrostratigraphic framework for this period of volcanic activity to resolve the nature, extent, scale and frequency of large silicic eruptions of the CPR, as well as conditions of magma genesis, the timing of changing depositional environments, and climate-related weathering regimes. Here, we present new volcanological, sedimentological, petrological, high-precision and in situ zircon geochronological, and zircon and volcanic glass compositional data from distal Lower and Middle Miocene volcaniclastic (e.g., ignimbrites and ashfalls) and residual (e.g., karst bauxites) deposits from southwestern CPR and the Dinarides. We integrate new and existing datasets to provide new constraints on the volcanic history and petrogenesis of the CPR, which occurred between ~18.1 Ma and ~16.8 Ma. Recognition of at least seven regionally extensive Early Miocene volcanic events suggests that large volume CPR ignimbrite-forming eruptions were more frequent, widespread and larger than previously considered. The multi-proxy approach applied on a distal record of the ~14.32 Ma silicic eruption of the CPR, stored within the Dinaride Lake System, implies more frequent CPR explosive volcanism during the Middle Miocene and permits us to interpret the emplacement of over-thickened volcaniclastic deposits as volcaniclastic turbidites. Finally, we unravel the Dinaridic residual record of the long-lasting Oligo--Miocene volcanic history of the AMR as well as the timing of intense chemical weathering at mid-latitudes during this time period.