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Open AccessArticle

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

1
Deep–Sea and Seabed Mineral Resources Research Center, Korea Institute of Ocean Science and Technology, Busan 49111, Korea
2
School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
3
Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Gwangju 61186, Korea
4
East Sea Research Institute, Korea Institute of Ocean Science and Technology, Uljin 36315, Korea
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(7), 644; https://doi.org/10.3390/min10070644
Received: 7 July 2020 / Revised: 16 July 2020 / Accepted: 20 July 2020 / Published: 20 July 2020
(This article belongs to the Section Mineral Geochemistry and Geochronology)
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 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 H2 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 TiO2 with Cr2O3 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. View Full-Text
Keywords: Dokdo and Ulleung islands; late Cenozoic volcanic islands; Fe-rich melt inclusion; Ti-magnetite; hydrous magmatism Dokdo and Ulleung islands; late Cenozoic volcanic islands; Fe-rich melt inclusion; Ti-magnetite; hydrous magmatism
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MDPI and ACS Style

Moon, I.; Lee, H.; Kim, J.; Oh, J.; Seoung, D.; Kim, C.H.; Park, C.H.; Lee, I. Ti-Magnetite Crystallization in Melt Inclusions of Trachytic Rocks from the Dokdo and Ulleung Islands, South Korea: Implications for Hydrous and Oxidized Magmatism. Minerals 2020, 10, 644. https://doi.org/10.3390/min10070644

AMA Style

Moon I, Lee H, Kim J, Oh J, Seoung D, Kim CH, Park CH, Lee I. Ti-Magnetite Crystallization in Melt Inclusions of Trachytic Rocks from the Dokdo and Ulleung Islands, South Korea: Implications for Hydrous and Oxidized Magmatism. Minerals. 2020; 10(7):644. https://doi.org/10.3390/min10070644

Chicago/Turabian Style

Moon, Inkyeong; Lee, Hyunwoo; Kim, Jonguk; Oh, Jihye; Seoung, Donghoon; Kim, Chang H.; Park, Chan H.; Lee, Insung. 2020. "Ti-Magnetite Crystallization in Melt Inclusions of Trachytic Rocks from the Dokdo and Ulleung Islands, South Korea: Implications for Hydrous and Oxidized Magmatism" Minerals 10, no. 7: 644. https://doi.org/10.3390/min10070644

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