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http://dx.doi.org/10.9719/EEG.2021.54.2.187

Geology and Volcanism of Hyeongjeseom (Islet) Volcano, Jeju Island  

Park, Jun Beom (US Army Corps of Engineers Far East District)
Koh, Gi Won (Water Resources R&D Center, Jeju Province Development Corporation)
Jeon, Yongmun (Jeju World Natural Heritage Headquarters, Jeju Special Self-Governing Province)
Park, Won Bae (Groundwater Researh Center, Jeju Research Institute)
Moon, Soo Hyoung (Water Resources R&D Center, Jeju Province Development Corporation)
Moon, Deok Cheol (Water Resources R&D Center, Jeju Province Development Corporation)
Publication Information
Economic and Environmental Geology / v.54, no.2, 2021 , pp. 187-197 More about this Journal
Abstract
The Hyeongjeseom (Islet) is an erosional remnant of volcano which is located about 2 km northeast of sea shore of the Songaksan tuff ring, and is composed of volcaniclastic deposit, agglomerate and scoria deposit, ponded lava, aa lava flows, reworked deposit and beach deposit in ascending order from the base. The volcano is formed by volcaniclastic deposits and lava flows that recorded a transition from initial phreatomagmatic to magmatic explosions followed by lava effusion. It is interpreted that the outcropped volcaniclastic deposit may be a remaining portion of outer ring of a tuff cone. A bomb and a ponded lava yield geochemically basaltic trachyandesite compositions (SiO2 51.3 wt%, Na2O+K2O 6.0 wt%) and belong to olivine basalt with scarce (<5 %) phenocrysts of olivine, petrographically. By incremental heating Ar-Ar dating method, the plateau age of lava flow in the Heongjesom is 9.2±3.6(2σ) ka, implying that the volcanism of Heongjeseom may have occurred earlier than the Songaksan tuff ring which erupted ca. 3.7 ka. It still remains a task to find a volcano which matches with a historical record of volcanic activity that occurred a thousand years ago.
Keywords
Hyengjeseom (Islet); volcanic cycle; Ar-Ar age; Jeju Island;
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