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Morphology and petrology of Jisagae columnar joint on the Daepodong basalt in Jeju Island, Korea  

Koh Jeong-Seon (Institute of Science Education, Pusan National University)
Yun Sung-Hyo (Department of Earth Sciences, Pusan National University)
Hong Hyun-Chu (Department of Earth Sciences, Pusan National University)
Publication Information
The Journal of the Petrological Society of Korea / v.14, no.4, 2005 , pp. 212-225 More about this Journal
Abstract
This study has been designed to elucidate the morphology of Jisagae columnar joints and the petrography and petrochemistry of Daepodong basalt in Jeju Island, distributed along the 3.5 km-long coast from Seongcheonpo to Weolpyeongdong. Colonnade of the Jisagae columnar joint typically occurs within the upper part of a flow and consists of relatively well-formed basalt columns. Most columns are straight with parallel sides and diameters from 100 cm to 205 cm, $130\~139\;cm$ in maximum. Length of the columns extends up to 20 m. Most columns tend to have 6 or 5 sides but sometimes they have as few as $3\~4$ or as many as 7 or 8 sides. The Daepodong basalt consists of plagioclase, olivine, orthopyroxene, clinopyroxene, ilmenite and magnetite. Plagioclase is labradorite, clinopyroxene is augite, orthopyroxene is bronzite and olivine is chrysolite and hyalosiderite. The Daepodong basalt shows porphyritic texture with matrix of mainly intersetal texture. The Daepodong basalt is plotted into alkali rock series on the TAS diagram. The tectonic setting of the Daepodong basalt represents within plate environment.
Keywords
Daepodong basalt; Jisagae; columnar joint; morphology; petrology;
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