A Study on Tree-ring Dating and Speciation of Charcoal found in Pumiceous Deposit of the Quaternary Nari Caldera, Ulleung Island, Korea

신생대 제4기 울릉도 나리칼데라 부석층에서 산출된 탄화목의 연륜연대 및 수종식별 연구

Im, Ji Hyeon;Choo, Chang Oh

  • Received : 2015.11.19
  • Accepted : 2015.12.24
  • Published : 2015.12.28


The purpose of this study is to provide an inquiry into paleovegetation (paleoenvironment), eruption age and inferred emplacement temperature of pyroclastic deposit using charcoal occurred in the Quaternary Nari Caldera, Ulleung Island. In order to obtain the data, we carried out species identification and tree-ring analysis, radiocarbon dating for the charcoal. This sample was collected from pumiceous deposit in lowermost member(Member N-5) of the Nari Tephra Formation, which corresponds to the wood branch that has well preserved the tree-ring structure. Speciation and outermost tree-ring of wood reveal Picea spp. and $263+{\alpha}$ years. The calibrated ages from the center(pith) to the outermost tree-ring are $20,260{\pm}230$, $19,995{\pm}245$, and $19,975{\pm}265cal\;BP$, respectively, which are accordant with the tree-ring position. The youngest age, <19,710 cal BP would have implications for the eruptive age of Member N-5. Our results indicate that Picea spp. is the paleovegetation representing that Nari Caldera was under cold and wet climate conditions during the late Pleistocene. Based on the silky luster, brittleness, color, and streak of charcoal, etc., the lowest emplacement temperatures of pyroclastic flow are interpreted to have been at least as high as $350{\sim}500^{\circ}C$.


Ulleung Island;charcoal;wood species;tree-ring analysis;radiocarbon dating


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Cited by

  1. Geological heritage of the Ulleungdo·Dokdo National Geopark and its management system vol.52, pp.5, 2016,


Grant : 지질박물관 기초학술 연구 및 전시 콘텐츠 개발

Supported by : 한국지질자원연구원