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http://dx.doi.org/10.7854/JPSK.2017.26.3.221

Volcanological History of the Baengnokdam Summit Crater Area, Mt. Halla in Jeju Island, Korea  

Ahn, Ung San (World Heritage Office, Jeju Special Self-Governing Provincial Government)
Hong, Sei Sun (Korea Institute of Geoscience and Mineral Resources)
Publication Information
The Journal of the Petrological Society of Korea / v.26, no.3, 2017 , pp. 221-234 More about this Journal
Abstract
The Baengnokdam, the summit crater of Mt. Halla, is one of the representative geosites of World Natural Heritage and Global Geopark in Jeju Island. The crater is marked by two distinctive volcanic lithofacies that comprise: 1) a trachytic lava dome to the west of the crater and 2) trachybasaltic lava flow units covering the gentle eastern slope of the mountain. This study focuses on understanding the formative process of this peculiar volcanic lithofacies association at the summit of Mt. Halla through field observation and optically stimulated luminescence (OSL) dating of the sediments underlying the craterforming volcanics. The trachyte dome to the west of the crater is subdivided into 3 facies units that include: 1) the trachyte breccias originating from initial dome collapse, 2) the trachyte lava-flow unit and 3) the domal main body. On the other side, the trachybasalt is subdivided into 2 facies units that include: 1) the spatter and scoria deposit from the early explosive eruption and 2) lava-flow unit from the later effusion eruption. Quartz OSL dating on the sediments underlying the trachyte breccias and the trachybasaltic lava-flow unit reveals ages of ca. 37 ka and ca. 21 ka, respectively. The results point toward that the Baengnokdam summit crater was formed by eruption of trachybasaltic magma at about 19~21 ka after the trachyte dome formed later than 37 ka.
Keywords
Jeju Island; Mt. Halla; Baengnokdam; OSL; dome collapse;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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