Carbon cycling in the subduction zones deduced from in-situ Carbon isotope analyses

2013 Fiscal Year Final Research Report

• Project/Area Number: 23654185
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Kanazawa University
• Principal Investigator: MORISHITA Tomoaki 金沢大学, 自然システム学系, 教授 (80334746)
• Co-Investigator(Renkei-kenkyūsha): MIZUKAMI Tomoyuki 金沢大学, 理工研究域自然システム学系, 助教 (80396811) ; TAMURA Akihiro 金沢大学, 理工研究域自然システム学系, 博士研究員 (80401884)
• Project Period (FY): 2011 – 2012
• Keywords: 炭素 / 沈み込み帯 / 局所炭素同位体分析 / かんらん岩 / ヒスイ輝岩

Research Abstract

In-situ carbon isotopic analyses using SIMS was developed at the University of Hawaii. I analyzed 4 different natural samples: (1) high-pressure metamorphic rocks, (2) contact metamorphic rocks, (3) jadeites, and (4) graphite-bearing mantle xenoliths. Unfortunately, I was not able to reliable date from (1) and (2) because of matrix effects of silicate inclusions within carbon-bearing phases in these samples. Graphite in jadeites has similar carbon isotopic compositions to mantle value. This suggests that fluids with mantle-like carbon isotopic compositions are responsible for the formation of jadeite at the beginning of subduction. Graphite in the mantle xenolith has light-carbon isotopic compositions. This suggest the carbon in the sample was of biogenic origin. This graphite will provide us useful information on origin of diamond in the mantle.

Research Products

• [Journal Article] Moho Transition Zone in the Cretaceous Andaman ophiolite, India : a passage from the mantle to the crust (2014)
  • Author(s): Ghosh, B., Morishita, T., Gupta, B.S., Tamura, A., Arai, S. and Bandyopadhyay
  • Journal Title: Lithos Volume: 198-199 Pages: 117-128
  • Peer Reviewed
• [Journal Article] Geochemistry of spinel-hosted amphibole inclusions in abyssal peridotite : insight into secondary melt formation in melt-peridotite reaction (2014)
  • Author(s): Tamu ra, A., Morishita, T., Ishimaru, S., Arai, S.
  • Journal Title: Contrib. Mineral. Petrol Volume: (In press)
  • Peer Reviewed
• [Journal Article] A new approach to develop the Raman carbonaceous material geothermometer for low-grade metamorphism using peak width (2014)
  • Author(s): Kouketsu, Y., Mizukami, T., Mori, H., Endo, S., Aoya, M., Hara, H., Nakamura D. and Wallis S.
  • Journal Title: Island Arc Volume: 23 Pages: 33-50
  • Peer Reviewed
• [Journal Article] 海洋コアコンプレックスから得られたかんらん岩の重要性 : :中央海嶺下マントル物質の不均質性とメルトの存在 (2013)
  • Author(s): 田村明弘・ 森下知晃・荒井章司
  • Journal Title: 岩石鉱物科学 Volume: 42 Pages: 221-231
  • Peer Reviewed
• [Journal Article] オフィオライトから推定するかんらん岩の島弧成熟過程 (2013)
  • Author(s): 森下知晃
  • Journal Title: 岩石鉱物科学 Volume: 42 Pages: 258-275
  • Peer Reviewed
• [Journal Article] Significance of chromian spinels from the mantle sequence of the Andaman ophiolite, India : Paleogeodynamic implications (2013)
  • Author(s): Ghosh, B., Morishita, T., Bhatta
  • Journal Title: Lithos Volume: 164-167 Pages: 86-89
  • Peer Reviewed
• [Journal Article] The earliest mantle fabrics formed during subduction zone infancy (2013)
  • Author(s): Harigane, Y., Michibayashi, K., Morishita, T., Tani, K., Dick, H. and Ishizuka, O.
  • Journal Title: Earth and Planetary Science Letters Volume: 377-378 Pages: 106-113
  • Peer Reviewed
• [Journal Article] The role of water in coesite crystallization from silica gel (2013)
  • Author(s): Arasuna, A., Okuno, M., Mizukami, T., Arai, S., Katayama, S., Koyano, M. and Ito, N.
  • Journal Title: European Journal of Mineralogy Volume: 25 Pages: 791-796
  • DOI: 10.1127/0935-1221/2013/0025-2331
  • Peer Reviewed
• [Presentation] Gondwana subduction-modified mantle domain prevents magmatic seafloor generation in the Central Indian Ridge (2013)
  • Author(s): Morishita, T ., Nakamura, K., Senda, R., Suzuki, K., Kumagai, H., Sato, H., Sato, T., Shibuya, T., Minoguchi, K., Okino, K
  • Organizer: American Geophysical Union, fall meeting
  • Place of Presentation: SanFrancisco, USA
  • Year and Date: 20131209-13
• [Presentation] Petrology of peridotites in the southern part of the Central Indian Ridge : Implications for ocean floor formation (2013)
  • Author(s): Morishita, T., Senda, R., Nakamura, K., Suzuki, K., Kumagai, H., Sato, H., Okino, K
  • Organizer: 地球惑星関連連合大会
  • Place of Presentation: 幕張, 千葉
  • Year and Date: 20130519-24
• [Presentation] Fragments of deep oceanic lithosphere from the Yukawa knoll in NW Pacific (2013)
  • Author(s): Mizukami, T., Nakamura, K., Morishita, T., Tamura, A., Arai, S., Abe, N. and Hirano, N
  • Organizer: 日本惑星地球科学連合
  • Place of Presentation: 幕張
  • Year and Date: 20130519-24
• [Book] Petrology of peridotites and related gabbroic rocks around the Kairei hydrothermal field in the Central Indian Ridge. In Subseafloor Biosphere Linked to Hydrothermal Systems: TAIGA Concept (Ishibashi, J., Okino, K. and Sunamura, M. edts) (2014)
  • Author(s): Morishita, T., Nakamura, K.., Shibuya, T., Kumagai, H., Sato, T., Okino, K., Sato, H., Nauchi, R., Hara, K. and Takamaru, R
  • Publisher: Springer(in press)