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Petrology and Geochemistry of Dokdo Valcanic Rocks, East Sea
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  • Journal title : Ocean and Polar Research
  • Volume 24, Issue 4,  2002, pp.465-482
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2002.24.4.465
 Title & Authors
Petrology and Geochemistry of Dokdo Valcanic Rocks, East Sea
Lee, Jong-Ik; Hur, Soon-Do; Lee, Mi-Jung; Yoo, Chan-Min; Park, Byong-Kwon; Kim, Yea-Dong; Kwon, Moon-Sang; Nagao, Keisuke;
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Petrological, geochemical, and geochronological studies of Dokdo volcanic rocks, East Sea, have been carried out to understand their petrogenesis. Dokdo volcanic activity is divided into three stages according to occurrences and eruption ages of rocks. The second-stage activity is accompanied by large volume of pyroclastics and lavas of intermediate composition, and occupies most of the East and West islets. K-Ar biotite and whole-rock ages indicate that Dokdo volcanic activity occurred during late Pliocene and became systematically younger toward later stages: namely, 2.7-2.4 Ma for the first-stage trachyte, 2.4-2.3Ma for the second-stage trachyandesite and 2.2-2.1 Ma for the last-stage trachyte and dikes. Dokdo volcanic rocks are of intermediate to felsic compostions, and have OIB-like alkaline nature. The geochemical similarities between Dokdo and Ulleungdo volcanic rocks suggest that they were formed from the same mantle plume. However, considering the difference of eruption ages between Dokdo (2.7-2.1 Ma) and Ulleungdo (1.4-0.01 Ma) volcanic rocks, the former seems to have been formed by earlier hot spot activity.
Dokdo;ocean island basalt;hot spot activity;
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암석학회지, 2010. vol.19. 2, pp.141-156
Sr-Nd-Pb isotopic compositions of submarine alkali basalts recovered from the South Korea Plateau, East Sea, Geosciences Journal, 2011, 15, 2, 149  crossref(new windwow)
Geochemical evolution of basaltic volcanism within the tertiary basins of southeastern Korea and the opening of the East Sea (Sea of Japan), Journal of Volcanology and Geothermal Research, 2013, 249, 109  crossref(new windwow)
3D gravity modelling for Anyongbok Seamount in the East Sea, Marine Geophysical Researches, 2007, 28, 3, 257  crossref(new windwow)
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Isotope geochemistry of Jeongok basalts, northernmost South Korea: Implications for the enriched mantle end-member component, Journal of Asian Earth Sciences, 2014, 91, 56  crossref(new windwow)
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