Preliminary communication

Pyroclastic flow sediment (ignimbrite) in Miocene Tar Formation, Drava Depression

Dijana Bigunac ; INA-Industry of Oil Plc., Exploration and Production, Sector for Geology and Reservoir Management, Department for Geomodelling, Šubićeva 29, Zagreb, Croatia
Krešimir Krizmanić ; INA Industry of Oil Plc., Exploration & Production BD, Field Engineering & Operations Sector, E&P Research Laboratory Department, Geology and Geochemistry BU, Lovinčićeva bb, Zagreb
Branko Sokolović ; INA Industry of Oil Plc., Exploration & Production BD, Field Engineering & Operations Sector, E&P Research Laboratory Department, Geology and Geochemistry BU, Lovinčićeva bb, Zagreb
Zlata Ivaniček ; INA Industry of Oil Plc., Exploration & Production BD, Field Engineering & Operations Sector, E&P Research Laboratory Department, Geology and Geochemistry BU, Lovinčićeva bb, Zagreb

Abstract

In the 2009 one of the exploration wells near Croatian-Hungarian borderline instead of prognosed primary target (Miocene barrier bar composed of sandstones, biogenic limestones and clayey limestones) 72 m shallower drilled through massive, 88 m thick pyroclastic flow sediment. Petrological analyses had been done on core as well as on drilling cuttings and the sediment is described as devitrified vitroclastic welded tuff, i.e. ignimbrite. As a result of micropaleontological and palynological analyses from overlying and underlying deposits, the age of the pyroclastic flow sediment was determined as the most probably Badenian. Lithostratigraphically that ignimbrite belongs to the Tar Formation.

Keywords

pyroclastic flow; ignimbrite; Tar Formation; Miocene; Drava Depression

Hrčak ID:

92322

URI

https://hrcak.srce.hr/92322

Publication date:

31.10.2012.

Article data in other languages: croatian

Visits: 2.672 *