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The Korean Peninsula is situated on the southeastern margin of the Eurasian plate, in a transitional setting between island arc and back-arc terranes resulting from subduction of the Philippine Sea plate beneath the Eurasian plate. Seismic tomography data show that the subduction zone near the Korean Peninsula is several hundred kilometers deep (Zhao et al., 2004(Zhao et al., , 2007. Previous studies have extensively investigated the noble gas isotopic ratios of rock, water, and gas samples obtained from the volcanoes and hot springs of the Japanese Island Arc around the subduction zones of the Pacific and Philippine Sea plates (