Ti-Magnetite Crystallization in Melt Inclusions of Trachytic Rocks from the Dokdo and Ulleung Islands, South Korea: Implications for Hydrous and Oxidized Magmatism SCIE SCOPUS

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Title
Ti-Magnetite Crystallization in Melt Inclusions of Trachytic Rocks from the Dokdo and Ulleung Islands, South Korea: Implications for Hydrous and Oxidized Magmatism
Author(s)
Moon, I.; Lee, H.; Kim, J.; Oh, J.; Seoung, D.; Kim, C.H.; Park, C.H.; Lee, I.
KIOST Author(s)
Moon, In Kyeong(문인경)Kim, Jonguk(김종욱)Oh, Ji Hye(오지혜)Kim, Chang Hwan(김창환)Park, Chan Hong(박찬홍)
Publication Year
2020-07
Abstract
The Dokdo and Ulleung islands (Korea) are volcanic islands in the East Sea (Sea of Japan), formed in the late Cenozoic. These volcanic islands, in the back-arc basin of the Japanese archipelago, provide important information about magma characteristics in the eastern margin of the Eurasian plate. The origin of the Dokdo and Ulleung intraplate volcanism is still controversial, and the role of fluids, especially water, in the magmatism is poorly understood. Here, we comprehensively analyzed the melt inclusions (10-100 mu m in diameter) hosted in clinopyroxene phenocrysts of trachyte, trachyandesite, and trachybasalt. In particular, we observed Ti-magnetite and amphibole which were crystallized as daughter mineral phases within melt inclusions, suggesting that Ti-magnetite was formed in an oxidized condition due to H2O dissociation and H(2)diffusion. The Ti-magnetite exhibited compositional heterogeneities of MgO (average of 8.28 wt %), Al2O3(average of 8.68 wt %), and TiO2(average of 8.04 wt %). The positive correlation of TiO(2)with Cr(2)O(3)is probably attributed to evolutionary Fe-Ti-rich parent magma. Correspondingly, our results suggested hydrous and oxidized magmatism for the Dokdo and Ulleung volcanic islands.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38602
DOI
10.3390/min10070644
Bibliographic Citation
MINERALS, v.10, no.7, pp.1 - 16, 2020
Publisher
MDPI
Subject
EAST SEA SEA; SILICA-RICH MELTS; VOLCANIC-ROCKS; EAST/JAPAN SEA; LAYERED INTRUSION; PLATE-TECTONICS; OPENING MODE; SW CHINA; BASIN; BASALTS
Keywords
Dokdo and Ulleung islands; late Cenozoic volcanic islands; Fe-rich melt inclusion; Ti-magnetite; hydrous magmatism
Type
Article
Language
English
Document Type
Article
Publisher
MDPI
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