The constraints from U-Th radioactive disequilibrium on genetic processes of volcanoes in the Kyshu arc

• Project/Area Number: 26400523
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: The University of Tokyo
• Principal Investigator: Shun'ichi Nakai 東京大学, 地震研究所, 教授 (50188869)
• Co-Investigator(Kenkyū-buntansha): 三好 雅也 福井大学, 学術研究院教育・人文社会系部門(教員養成), 准教授 (50557353)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 九州弧 / ウラン－トリウム放射非平衡 / 火山岩 / スラブ溶融 / 堆積物溶融 / 沈み込み流体 / ウランートリウム放射非平衡 / スラブ流体 / 九州 / ウラン-トリウム放射非平衡 / アダカイト / 火山 / ウラン‐トリウム放射非平衡

Outline of Final Research Achievements

We examined whether the volcanisms in Kyushu island are related to the addition of slab derived fluids or the melting of slab or sediments with the index of radioactive disequilibrium between 230Th and 238U. Forty five samples from Yufudake, Kuju, Oninomi, Aso, Kirishima, Kaimon, Unzendake and Fukue-jima were analyzed.
The results of the analyses indicated most of the samples have (230Th/238U) of close to unity. Samples of Oninomi, a part of Aso, Unzendake, Fukue-jima and a part of Kaimon have (230Th/238U) larger than 1.05, suggesting melting under the presence of residual garnet. The results also indicated the absence of (230Th/238U) less than 1.0, which is commonly observed among the volcanic rocks originated by the volcanisms triggered by the addition of slab derived fluids.

Research Products

• [Journal Article] Age of Mirny field kimberlites (Siberia) and application of rutile and titanite for U-Pb dating of kimberlite emplacement by LA-ICP-MS (2016)
  • Author(s): Agashev, A. M., Y. Orihashi, N. P. Pokhilenko, I. V. Serov, A. V. Tolstov and S. Nakai
  • Journal Title: Geochem. J. Volume: 50 Issue: 5 Pages: 431-438
  • DOI: 10.2343/geochemj.2.0438
  • NAID: 130005249800
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 火成岩カードの開発と中学校理科授業における活用 (2016)
  • Author(s): 三好雅也・淺原雅浩・大山利夫・葛野剛司・佐々木直広
  • Journal Title: 福井大学教育実践研究 Volume: 41 Pages: 27-35
  • NAID: 120005983095
• [Journal Article] A trachyte-syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dozen, south-west Japan) (2015)
  • Author(s): Brenna, M., S. Nakada, D. Miura, K. Toshida, H. Ito, N. Hokanishi and S. Nakai
  • Journal Title: Contrib. Mineral. Petrol Volume: 170 Issue: 2 Pages: 1-22
  • DOI: 10.1007/s00410-015-1181-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Rare Earth Elements of the Arima Spring Waters, Southwest Japan: Implications for Fluid–Crust Interaction during Ascent of Deep Brine (2015)
  • Author(s): Nakamura, H., K. Chiba, Q. Chang, S. Nakai, K. Kazahaya and H. Iwamori
  • Journal Title: J. Geol. Geoｐｈｙｓ. Volume: 4 Pages: 1-8
  • NAID: 130005492421
  • Peer Reviewed / Open Access
• [Journal Article] Progressive interaction between dry and wet mantle during high-temperature diapiric upwelling: constraints from Cenozoic Kita-Matsuura intraplate basalt province, northwestern Kyushu, Japan (2014)
  • Author(s): Tetsuya Sakuyama, Shun'Ichi Nakai, Masako Yoshikawa, Tomoyuki Shibata, Kazuhito Ozawa
  • Journal Title: Journal of Petrology Volume: 印刷中 Issue: 6 Pages: 1083-1128
  • DOI: 10.1093/petrology/egu020
  • Peer Reviewed / Open Access
• [Journal Article] Isotope evolution in the HIMU reservoir beneath St. Helena: Implications for the mantle recycling of U and Th. (2014)
  • Author(s): Hanyu , T., Kawabata, H. Tatsumi, Y., Kimura J., Hyodo, H., Sato, K., Miyazaki, T., Chang, Q., Hirahara, Y., Takahashi, T., Senda, R. and Nakai, S.
  • Journal Title: Geochimica Cosmochimica Acta Volume: 143 Pages: 232-252
  • DOI: 10.1016/j.gca.2014.03.016
  • Peer Reviewed / Open Access
• [Journal Article] Feasibility studies of Sn isotope composition for provenancing ancient bronzes (2014)
  • Author(s): Yamazaki, E.; Nakai, S.; Sahoo, Y.; Yokoyama, T.; Mifune, H.; Saito, T.; Chen, J.; Takagi, N.; Hokanishi, N.; Yasuda, A.
  • Journal Title: Journal of Archaeological Science Volume: 52 Pages: 458-467
  • DOI: 10.1016/j.jas.2014.09.014
  • NAID: 130005492214
  • Peer Reviewed / Open Access
• [Presentation] 阿蘇のマグマ供給系の変遷 (2017)
  • Author(s): 三好雅也
  • Organizer: 国際火山噴火史情報研究集会
  • Place of Presentation: 福岡大学（福岡県福岡市）
  • Year and Date: 2017-01-21
• [Presentation] 阿蘇火山のマグマ供給系の変遷 (2017)
  • Author(s): 三好雅也
  • Organizer: 災害の軽減に貢献するための地震火山観測研究 「噴火履歴及び観測事例に基づく噴火事象系統樹の試作」研究集会
  • Place of Presentation: 熊本大学（熊本県熊本市）
• [Presentation] The influence of U, Th mobility in hydrothermal fluids on U-Th radioactive disequilibrium dating of sulphide minerals (2016)
  • Author(s): S. NAKAI, A. TAKAMASA, R. YOSHIZUMI, T, URABE, T. FUJIWARA, S. TOYODA AND J. ISHIBASHI
  • Organizer: Goldschmidt 2016
  • Place of Presentation: 横浜国際平和会議場（神奈川県横浜市）
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] 海底熱水鉱床の硫化鉱物のウラン－トリウム放射非平衡について (2016)
  • Author(s): 中井 俊一、賞雅 朝子、藤原 泰誠、豊田 新、石橋 純一郎、浦辺 徹郎、吉住 亮人
  • Organizer: 日本地球惑星科学連合 連合大会 2016年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2016-05-22
  • Invited
• [Presentation] スズ同位体を用いた青銅器の産地推定の可能性 (2015)
  • Author(s): 中井俊一，山崎絵里香，横山哲也，三船温尚，齋藤努，陳建立，サフーユービン
  • Organizer: 日本地球化学会
  • Place of Presentation: 横浜国立大学教育人間科学部（神奈川県横浜市）
  • Year and Date: 2015-09-17
• [Presentation] タングステン同位体から探る地球初期進化 (2015)
  • Author(s): 賞雅朝子，中井俊一，飯塚毅
  • Organizer: 日本地球化学会
  • Place of Presentation: 横浜国立大学教育人間科学部（神奈川県横浜市）
  • Year and Date: 2015-09-16
  • Invited
• [Book] Boron and Chlorine contents of basalts from Shatsky Rise, IODP Expedition 324: implications for the alteration of oceanic plateaus. In: "The Origin, Evolution, and Environmental Impact of Oceanic Large Igneous Provinces (eds. Neal C.R., Sager W., Sano T., Erba E)". (2015)
  • Author(s): Masaya Miyoshi, Takashi Sano, Kenji Shimizu, Adelie Delacour, Toshiaki
  • Total Pages: 339
  • Publisher: Geological Society of America
• [Book] Rubidium-Strontium dating, Hydrothermal Events, in “Encyclopedia of Scientific Dating Methods” (2015)
  • Author(s): Nakai, S.
  • Total Pages: 978
  • Publisher: Springer
• [Book] Dating of Hydrothermal Mineralizatoin in Active Hydrothermal Fields in the Southern Mariana Trough, In "Subseafloor Biosphere Linked to Hydrothermal Systems (Eds. Ishibashi, Okino and Sumamura)" (2014)
  • Author(s): Ishibashi, J., K. Shimada, F. Sato, A. Uchida, S. Toyoda, A. Takamasa, S. Nakai, H. Hyodo, K. Sato, H. Kumagai, and K. Ikehata
  • Total Pages: 666
  • Publisher: Springer
• [Book] Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses, In "Subseafloor Biosphere Linked to Hydrothermal Systems (Eds. Ishibashi, Okino and Sumamura)" (2014)
  • Author(s): Kumagai, H., H. Watanabe, T. Yahagi, S. Kojima, S. Nakai, S. Toyoda and J. Ishibashi
  • Total Pages: 666
  • Publisher: Springer
• [Book] ESR Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough. In "Subseafloor Biosphere Linked to Hydrothermal Systems (Eds. Ishibashi, Okino and Sumamura)" (2014)
  • Author(s): Fujiwara, T., S. Toyoda, A. Uchida, J. Ishibashi, S. Nakai, A. Takamasa
  • Total Pages: 666
  • Publisher: Fujiwara
• [Book] 226Ra-210Pb and 228Ra-228Th Dating of Barite in Submarine Hydrothermal Sulfide Deposits Collected at the Okinawa Trough and the Southern Mariana Trough. In "Subseafloor Biosphere Linked to Hydrothermal Systems (Eds. Ishibashi, Okino and Sumamura)" (2014)
  • Author(s): Uchida, A., S. Toyoda, J. Ishibashi, S. Nakai
  • Total Pages: 666
  • Publisher: Springer
• [Book] Crystal uptake into aphyric arc melts: insights from two-pyroxene pseudo-decompression paths, plagioclase hygrometry, and measurement of hydrogen in olivines from mafic volcanics of southwest Japan. In: Gomez-Tuena A., Straub S.M., Zellmer G.F. (eds) Orogenic andesites and crustal growth. (2014)
  • Author(s): Zellmer, G. F., N. Sakamoto, Y. Iizuka, M. Miyoshi, Y. Tamura, H. Hsieh, Hi. Yurimoto
  • Total Pages: 385
  • Publisher: Geological Society, London, Special Publications
• [Book] Along-Arc Geochemical Variations in Quaternary Magmas of Northern Kyushu Island, Japan. In: Gomez-Tuena A., Straub S.M., Zellmer G.F. (eds) Orogenic andesites and crustal growth. (2014)
  • Author(s): Shibata, T., M. Yoshikawa, J. Itoh, O. Ujike, M. Miyoshi, K. Takemura
  • Total Pages: 385
  • Publisher: Geological Society, London, Special Publications