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Evolution of Columnar Joint Polygonal Patterns at Rupnica Geosite (Papuk Geopark, Croatia)

The Rupnica locality is situated in the NW part of the Nature Park Papuk (Croatia), near the small town of Voćin. Geological importance of this site lies in an exceptional geomorphological appearance of the columnar jointing in volcanic rocks (albite rhyolite comprising quartz, albite and mica with subordinate alkali pyroxene, magnetite, apatite, amphibole, chlorite, illite, smectite and calcite). Cracking pattern on the Rupnica geosite shows that four-sided and five-sided columns prevail which is in the good accordance to the results expected for shallow placed and relatively rapidly cooled volcanic mass.

columnar jointing; Rupnica; Papuk; geopark

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