Geochemical Characterization of Intraplate Magmatism from Quaternary Alkaline Volcanic Rocks on Jeju Island, South Korea

Research on Jeju Island's Quaternary alkaline volcanic rocks reveals two distinct magmatic events shaped the island's geology. Analysis of major and trace elements indicates that these rocks originated from a single parent magma, with minimal continental crustal contamination (0–0.3% by AFC modeling), rather than mixing different magma sources. The study suggests that the upper mantle beneath Jeju was influenced by arc magmatism due to the subduction of the Pacific Plate beneath the Eurasian Plate, represented by mantle xenoliths. A second magmatic event occurred in a divergent setting, forming the host volcanic rocks. This dual process, combined with fractional crystallization and slight crustal assimilation, explains the geochemical diversity observed. The study also highlights that Jeju's xenoliths exhibit unique geochemical patterns, prompting further investigation.

Kim, C., Khant, N. A., Jeon, Y., Kim, H., & Lim, C. (2021). Geochemical Characterization of Intraplate Magmatism from Quaternary Alkaline Volcanic Rocks on Jeju Island, South Korea. Applied Sciences, 11(15), 7030. https://doi.org/10.3390/app11157030