Technical development of in-situ dating method for tiny zircon and implication for metamorphic dynamics.

• Project/Area Number: 20340151
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Okayama University
• Principal Investigator: KOBAYASHI Katsura Okayama University, 地球物質科学研究センター, 准教授 (20325129)
• Co-Investigator(Kenkyū-buntansha): TSUJIMORI Tatsuki 岡山大学, 地球物質科学研究センター, 准教授 (00436833)
• Research Collaborator: REHMAN Hafiz Ur 鹿児島大学, 理工学研究科, 助教 (60505410)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000); Fiscal Year 2010: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2009: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2008: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
• Keywords: 地球惑星進化 / ジルコン / 年代測定 / 二次イオン質量分析計 / 変成岩 / エクロジャイト / コヒースタン / ICP-MS / 花崗岩 / 微小領域 / DUOレンズ / 自動研磨装置 / 円形岩石薄片 / 標準試料 / クリーンルーム

Research Abstract

The main subject of this research was development of in-situ zircon dating method by the secondary ion mass spectrometer. The author succeeded to develop sample polishing technique to get the very flat surface and to prepare reliable zircon standards by conventional techniques, then established new dating method, which can be applied less than 10 micron zircon grain. The method had been applied to the Kohistan high pressure metermorphic rocks and determined ~45 Ma as their metermorphic age.

Research Products

• [Journal Article] Provenance and reconnaissance study of detrital zircons of the Palaeozoic Cape Supergroup in South Africa : revealing the interaction of the Kalahari and Rio de la Plata cratons, Int. (2011)
  • Author(s): Fourie, P.H., Zimmermann, U., Beukes, N. J., Naidoo, T., Kobayashi, K., Kosler, J., Nakamura, E., Tait, J., Theron, J.N.
  • Journal Title: J. Earth Sci. Vol.100 Pages: 527-541
• [Journal Article] Provenance and reconnaissance study of detrital zircons of the Palaeozoic Cape Supergroup in South Africa : revealing the interaction of the Kalahari and Rio de la Plata cratons (2011)
  • Author(s): Fourie, P.H., Zimmermann, U., Beukes, N.J., Naidoo, T., Kobayashi, K., Kosler, J., Nakamura, E., Tait, J., Theron, J.
  • Journal Title: Int.J.Earth Sci. Volume: 100 Pages: 527-541
  • Peer Reviewed
• [Journal Article] Ion microprobe U-Pb geochronology and trace element geochemistry of the zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan. (2010)
  • Author(s): Rehman H.U., Kobayashi K., Tsujimori T., Nakamura E., Yamamoto H., Khan T.
  • Journal Title: Eos Trans. AGU Vol.91
• [Journal Article] Recycled crustal melt injection into lithospheric mantle : implication from cumulative composite and pyroxenite xenoliths (2010)
  • Author(s): Zhang, H.-F., Nakamura.E., Kobayashi, K., Ying.J.-F., Tnag.Y.-J.
  • Journal Title: Int.J.Earth Sci.(Geol.Rundsch) Volume: 99 Pages: 1167-1186
  • Peer Reviewed
• [Journal Article] Ion microprobe U-Pb geochronology and trace element geochemistry of the zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan. (2010)
  • Author(s): Rehman H.U., Kobayashi K., Tsujimori T., Nakamura E., Yamamoto H., Khan T.
  • Journal Title: Eos Trans.AGU Volume: 91
• [Journal Article] Mineralogical and geochemical constraints on magmatic evolution of Paleocene adakitic andesites from the Yanji area, NE China (2009)
  • Author(s): Guo.F., Nakamura, E., Fan, W., Kobayashi, K., Li, C., Gao, X.
  • Journal Title: Lithos 112 Pages: 321-341
  • Peer Reviewed
• [Journal Article] Eclogite-high-pressure granulite metamorphism records early collision in West Gondwana : new data from the Southern Braslia Belt. Brazil (2009)
  • Author(s): Reno, B.L., Brown, M., Kobayashi, K., Nakamura, E., Piccoli, P.M., Trouw, R.A.J.
  • Journal Title: J. Geol. Soc. London 116 Pages: 1013-1032
  • Peer Reviewed
• [Journal Article] Multiple Pulses of the Mantle Plume : Evidence from Tertiary Icelandic Lavas (2008)
  • Author(s): Kitagawa, H., Kobayashi, K., Makishima, A., Kakamura, E.
  • Journal Title: J. Petrol. 49 Pages: 1365-1396
  • Peer Reviewed
• [Journal Article] Boron cycling by subducted lithosphere ; insights from diamondiferous tourmaline from the Kokchetav ultrahigh-pressure metamorphic belt (2008)
  • Author(s): Ota, T., Kobayashi, K., Kunihiro, T., Nakamura, E.
  • Journal Title: Geochim. Cosmochim. Acta 72 Pages: 3531-3541
  • Peer Reviewed
• [Journal Article] Late Mesozoic silicic magmatism of the North Chukotka area (KE Russia) : Age, magma sources, and geodynamic implications (2008)
  • Author(s): Tikhomirov, P. L., Kalinina, E. A., Kobayashi, K., Nakamura, E.
  • Journal Title: Lithos 105 Pages: 329-346
  • Peer Reviewed
• [Presentation] Ion microprobe U-Pb geochronology and trace element geochemistry of the zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan. (2011)
  • Author(s): Rehman H.U., Kobayashi K., Tsujimori T., Nakamura E., Yamamoto H., Khan T.
  • Organizer: Western Pacific Geophysics Meeting
  • Place of Presentation: Taipei, (Taiwan)(招待講演)
  • Year and Date: 2011-06-24
• [Presentation] Ion microprobe U-Pb geochronology and trace element geochemistry of the zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan. (2010)
  • Author(s): Rehman H.U., Kobayashi K., Tsujimori T., Nakamura E., Yamamoto H., Khan T.
  • Organizer: Western Pacific Geophysics Meeting
  • Place of Presentation: Taipei (Taiwan).
  • Year and Date: 2010-06-24
• [Presentation] Geochemistry of volcanic and Plutonic rocks from the southern Musoma-Mara greenstone belt : Implication for the evolution of the Tanzania craton (2008)
  • Author(s): Mcsso, CW, Yamashita, K. Kobayashi. K, Makishima, A, Sakaguchi. C, Xakmura E.
  • Organizer: Goldschmidt Conference 2008
  • Place of Presentation: Vancouver, Canada
  • Year and Date: 2008-07-16
• [Remarks]
  • URL: http://www.misasa.okayama-u.ac.jp/
• [Remarks]
  • URL: http://www.misasa.okayama-u.ac.jp/
• [Remarks]
  • URL: http://www.misasa.okayama-u.ac.jp/
• [Remarks]
  • URL: http://www.misasa.okayama-u.ac.jp/