Geologic characteristics of Jeju Samdasoo watershed in Jeju Island, Korea (I): Regional surface geology and volcanic activities

Conceptualizing a multi‐layered shingle aquifer model based on volcanic stratigraphy and water inflow to lava caves in Jeju Island, Korea

“…The earliest evidence of volcanism is represented by the buried Seoguipo Formation, which was formed by hydrovolcanic activity between 1.8 and 0.5 Ma and consists of numerous superimposed phreatomagmatic volcanoes (tuff rings/cones) with intervening volcaniclastic sediments (Sohn et al, 2008; Sohn & Park, 2004). Later, volcanic activity was dominated by lava effusion, producing the lava shield dotted with hundreds of volcanic cones and the 1950‐m‐high central peak composed of a lava dome complex (Koh et al, 2013). Several tuff rings and tuff cones had formed atop the lava shield due to hydrovolcanic activity, which occurred mainly in coastal regions during the Late Pleistocene and Holocene (Ahn et al, 2015; Cheong et al, 2007).…”

Helium isotopes and olivine geochemistry of basalts and mantle xenoliths in Jeju Island, South Korea: Evaluation of role of SCLM on the Cenozoic intraplate volcanism in East Asia

“…1). The DB samples are low-Al alkaline basalts, while rocks from SB and KB are tholeiitic basalts (Brenna et al 2012b;Koh et al 2013). The DB basalts contain olivine, clinopyroxene, and plagioclase phenocrysts while the SB and KB basalts include only olivine phenocrysts.…”

“…The volcanic activity of Jeju is mainly divided into submarine (1.88 Ma to 0.5 Ma) and subaerial periods (0.5 Ma to Holocene), separated by the hydrovolcanic activity of the Seoguipo Formation (Koh et al, 2013). During the subaerial period (Stage 1 of Brenna et al, 2015), the melt flux was relatively low, and both high Al alkaline basalts and trachytic lava flows erupted (Brenna et al, 2015(Brenna et al, , 2012b.…”

“…In order to test the prevailing hypotheses, we report a study of Jeju Island, a large Cenozoic intraplate volcanic center in the Korean Strait (Brenna et al, 2012a;Koh et al, 2013).…”

Korean geoheritage: the volcanic landforms of the Jeju Island UNESCO Global Geopark

“…Research on Jeju Island's volcanic processes progressed significantly from 1970 as groundwater drilling projects began to obtain subterranean rock cores. In addition to this, there has been significant research on hydromagmatic volcanoes and lava flows (Chough and Sohn, 1990;Tamanyu, 1990;Koh, 1997;Park et al, 1999;Sohn and Park, 2004;Sohn and Park, 2008;Sohn et al, 2012;Koh et al, 2013;Go and Sohn, 2021;Jeon et al, 2022) in addition to the island's UNESCO World Heritage sites (Hwang et al, 2005;Ahn and Hwang, 2009;Woo et al, 2013;Woo et al, 2019).…”