Geomorphology and volcaniclastic deposits around Dokdo: Dokdo caldera SCOPUS KCI

Title
Geomorphology and volcaniclastic deposits around Dokdo: Dokdo caldera
Author(s)
Chun, J.H.; Cheong, D.K.; Park, C.H.; Huh, S.; Han, S.J.
Publication Year
2002-12
Abstract
Detailed investigations on both submarine and subaerial volcaniclastic deposits around Dokdo were carried out to identify geomorphologic characteristics, stratigraphy, and associated depositional processes of Dokdo caldera. Dokdo volcano has a gently sloping summit (about 11 km in diameter) and relatively steep slope (basal diameter is about 20-25 km) rising above sea level at about 2,270 m. We found ragged, elliptical-form of Dokdo caldera with a diameter of about 2 km estimated by Chirp (3-11 kHz) sub-bottom profile data and side scan sonar data for the central summit area of Dokdo volcano. We interpreted that the volcaniclastic deposits of Dokdo unconformably consist of the Seodo (west islet) and the Dongdo (east islet) formations based on internal structure, constituent mineral composition, and bedding morphology. The Seodo Formation mainly consisted of massive or inversely graded trachytic breccias (Unit S-I), overlain by fine-grained tuff (Unit S-II), which is probably supplied by mass-wasting processes resulting from Dokdo caldera collapse. The Dongdo Formation consists of alternated units of stratified lapilli tuff and inversely graded basaltic breccia (Unit D-I, Unit D-III, and Unit D-V), and massive to undulatory-bedded basaltic tuff breccias (Unit D-II and Unit D-IV) formed by a repetitive pyroclastic surge and reworking processes. Although, two islets of Dokdo are geographically near each other, they have different formations reflecting their different depositional processes and eruptive stages.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5759
DOI
10.4217/OPR.2002.24.4.483
Bibliographic Citation
Ocean and Polar Research, v.24, no.4, pp.483 - 490, 2002
Publisher
Korea Ocean Research and Development Institute
Keywords
Dokdo; Dokdo caldera; Mass-wasting processes; Pyroclastic surge
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
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