Petrology and geochemistry of Dokdo volcanic rocks, East Sea SCOPUS KCI

Title
Petrology and geochemistry of Dokdo volcanic rocks, East Sea
Author(s)
Lee, J.I.; Hur, S.D.; Lee, M.J.; Yoo, C.M.; Park, B.-K.; Kim, Y.; Kwon, M.S.; Nagao, K.
KIOST Author(s)
Yoo, Chan Min(유찬민)
Publication Year
2002-12
Abstract
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, 2.4-2.3 Ma 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 compositions, 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.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5769
DOI
10.4217/OPR.2002.24.4.465
Bibliographic Citation
Ocean and Polar Research, v.24, no.4, pp.465 - 482, 2002
Publisher
Korea Ocean Research and Development Institute
Keywords
Dokdo; Hot spot activity; Ocean island basalt
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

Ocean Geology,Mineral resources,해양지질,광물자원

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