Sample locations in the Hallasan Natural Reserve, Jeju Island.|@|~(^,^)~|@|Total alkali(Na₂O+K₂O) vs. Silica(SiO₂) diagram of the volcanic rocks from the Halla Natural Reserve. Rock nomenclature is by Le Maitre et al.(2002). The solid(Irvine and Baragar, 1971) and dashed(Macdonald and Katsura, 1964) lines divide alkali and sub-alkaline rocks. Abbreviations – AB : alkali basalt, TrnB : trasitional basalt, ThB : tholeiitic basalt, TB : trachybasalt, BTA : basaltic trachyandesite, BA : basaltic andesite, TA : tracyandesite, T : trachyte, A : andesite, D : dacite, R : rhyolite.|@|~(^,^)~|@|Photographs of ⁴⁰Ar/³⁹Ar dating sites from the Hallasan Natural Reserve, Jeju Island. (A) Eorimok(HL062), (B) Eoseungsaeng (HL021), (C) Janggumok(HL023), (D) Manseidongsan(HL039), (E) Witsebuleun-Oreum(HL055), (F) Witsejokeun-Oreum (HL034), (G) Witsenueun-Oreum(HL031), (H) Bangae-Oreum(HL212), (I) Witbangae-Oreum(HL213), (J) Albangae-Oreum(HL216).|@|~(^,^)~|@|Photographs of ⁴⁰Ar/³⁹Ar dating sites from the Hallasan Natural Reserve, Jeju Island. (A) Dongsuak(HL143), (B) Seongneol- Oreum(HL112), (C) Nongoak(HL173), (D) Heugbuleun-Oreum(HL117), (E) Boriak(HL163), (F) Muljangol(HL127), (G) Samgagbong (HL089), (H) Yeongsil(HL172), (I) Dongheung-cheon(HL219), (J) Gungsan-cheon(HL209).|@|~(^,^)~|@|Photographs of ⁴⁰Ar/³⁹Ar dating sites from the Hallasan Natural Reserve, Jeju Island. (A) Eorimok-kyo(HL064), (B) Donnaeko, 1,510m(HL233), (C) Donnaeko, 910m(HL236), (D) Baengnokdam(HL043), (E) Dosun-cheon(HL231).|@|~(^,^)~|@|⁴⁰Ar/³⁹Ar plateau age of the whole rock(groundmass) samples from the Hallasan Natural Reserve, Jeju Island.|@|~(^,^)~|@|The altitude and Ar-Ar ages of volcanic lava from the outcrops in the Hallasan Natural Reserve.|@|~(^,^)~|@|Modified geologic map of the Hallasan Natural Reserve (modified after Park et al., 2000). Qbntb : Baengnokdam Trachybasalt, Qbtb : Beopjeongdong Trachybasalt, Qbtbs : Beopjeongdong Trachybasalt Scoria cone, Qhta : Hallasan Trachyte, Qks : Kuljeongdong Conglomerate, Qmtbs : Muljangol Trachybasalt Scoria cone, Qsntb : Seongneolorem Trachybasalt, Qsntbs : Seongneolorem Trachybasalt, Qstb : Sioreum Trachybasalt, Qwtbs : Witseoreum Trachybasalt, Qbrtb : Boriak Trachybasalt, Qhata : Haeandong Trachybasalt.

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