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

A comprehensive geological survey of the Jeju Samdasoo watershed, covering approximately 27 km², reveals that the region's volcanic activity spans from about 48.5 thousand to 17.3 thousand years ago. The study identifies 15 distinct lava flows, primarily composed of alkali basalt to trachyandesite, with a notable oldest flow dating back to 48.5±11.4 ka and the youngest, Noseorim lava flow, at 17.3±8.6 ka. The research also highlights the formation of alluvial-proluvial layers during quiescent periods between volcanic eruptions, significantly shaping the landscape. By integrating geological mapping with geochemical analysis and radiometric dating (Ar40/Ar39), the study reconstructs the temporal sequence of volcanic events, providing critical insights into the region's dynamic geological history.

Koh, G. W., Park, J. B., Kim, T. H., Moon, D. C., & Moon, S. H. (2021). Geologic characteristics of Jeju Samdasoo watershed in Jeju Island, Korea (I): Regional surface geology and volcanic activities. Journal of the Geological Society of Korea, 57(1), 49–65. https://doi.org/10.14770/jgsk.2021.57.1.49