The Study on the Spherulitic Rhyolites in the northern part of Juwang Mt., Cheongsong. Chang Whan Oh1, Sung Won Kim2, Sang Koo Hwang3, Chang Whan Son1, Chang Suk Kim1 and Hyung Shik Kim41Department of Earth and Environmental Sciences, Chonbuk National Universlty, Jeonju 561-756, Korea2Basic Science Research Institute, Chonbuk National University, jeonju 561-756, Korea 3Department of Earth and Environmental Sciences, Andong National University, Andong 760-749, Korea4Department of Earth and Environmental Sciences, Korea University, Selul 136-701, Korea*Corresponding author: Tel. 82-63-270-3397, E-mail, ocwhan@chonbuk.co.krAbstract : In Cheongsong area, very rare spherulitic rhyolites both in Korea and foreign countries occur as dykes showing various types. The spherulites in them represent an undercooling caused by very fast cooling of the dykes in a shallow depth near to the surface and the variety of types were resulted from the difference of relative cooling rate. Cheongsong spherulit...