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Pan-African event in the East Antarctica : significance in the formation of the Gondwana

Research Project

Project/Area Number 06640591
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Geology
Research InstitutionNational Institute of Polar Research

Principal Investigator

SHIRAISHI Kazuyuki  National Institute of Polar Research, Department of Crustal Studies, Professor, 研究系, 教授 (90132711)

Co-Investigator(Kenkyū-buntansha) KAGAMI Hiroo  Okayama University, Institute of Earth Interior Studies, Associate Professor, 地球科学研究センター, 助教授 (20108179)
MOTOYOSHI Yoichi  National Institute of Polar Research, Department of Crustal Studies, Associate P, 研究系, 助教授 (90211606)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
KeywordsEast Antarctica / Geochronology / Metamorphism / Ion Microprobe / SHRIMP / Gondwana / Pan-African / Proterozoic
Research Abstract

1. The metamorphic and protolith ages of the Rayner Complex(RC) have been examined using SHRIMP U-Pb zircon ages in combination with Sm-Nd and Rb-Sr mineral and whole rock isochron ages. Within the RC we have determined distinct Proterozoic to Cambrian events ; -520-540 Ma at the coastal outcrops, -900-1000 Ma in more inland outcrops. These ages are considered to represent two high-grade metamorphic events. Another grouping of U-Pb zircon ages at -780-800 Ma is consistent with previously reported 770 Ma igneous activity. we intend to further examine the extent and nature of this event. The new U-Pb zircon data show that part of the area formerly considered to represent the western margin of the Proterozoic Rayner Complex underwent high grade metamorphism during the Cambrian (Pan-African) and we propose that it is an eastward continuation of the Lutzow-Holm Complex (LHC).
2. A Rb-Sr and Sm-Nd isotope study of meta-trondhjemites and a pelitic gneiss from Cape Hinode, LHC,has been performe … More d. Taking into account the initial ratios and the previous zircon U-Pb study, we concluded that the -1000 Ma age indicates the time of igneous crystallization of the trondhjemite. The pelitic gneiss, which probably originated from middle Proterozoic supracrustal material, is the host rock of the trondhjemite intrusion. However, the -500 Ma high grade metamorphic age, which is ubiquitous in the LHC,is not documented in these rocks, because of either the extent sample collection area or allochtonous origin of the terrane.
3. Data calibration for a X-ray fluorescence analyzer which was newly intstalled at NIPR was performed and geochemical studies at the Sor Rondane Mountains, Yamato Mountains and RC were carried out using the XRF.The results are compiled in the database at NIPR.
In conclusion, the Pan-African event extensively affected these terranes much more than previously considered and we presume the collisional tectonics playd an important role. Further geochemical and isotopic examination of the metamorphic and plutonic rocks from these area is ongoing. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] 本吉洋一・白石和行: "蛍光X線分析装置による岩石の定量化学分析:(1)主要元素" 南極資料. 39. 29-37 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Motoyoshi, Y., Shiraishi, K.: "Geological map of Northern Yamato mountains (2) Mt. Torimai, Antarctica." Antarctic Geol. Map Ser., Sheet. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kagami, H., Owada, M., Osanai, Y., Shiraishi, K. and Hiroi, Y.: "Rb-Sr and Sm-Nd ages from the Highland Complex of SriLanka." Proceedings of the Japan Academy. 71. 139-144 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ikeda, Y., Shiraishi, K. and Kagami, H.: "Geochemical characteristics of mafic dike rocks from the Sor Rondane Mountains, East Antactica." Proc. NIPR Symp. Antarct. Geosci.8. 49-64 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shiraishi, K., Kagami, H. and Yanai, K.: "Sm-Nd and Rb-Sr isochron ages for meta-trondhjemites from Cape Hinode, East Antarctica." Proc. NIPR Symp. Antarct. Geosci.,. 8. 130-136 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 本吉洋一・石塚英男・白石和行: "蛍光X線分析装置による岩石の定量化学分析:(2)微量元素" 南極資料. 40. 53-63 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 白石和行: "南極から見たゴンドワナの形成" 月刊地球. (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shiraishi, K., D. J. Ellis, C. M. Fanning, Hiroi, Y., Kagami, H. Motoyoshi, Y.: "Re-examination of the metamorphic and protolith ages of the Rayner Complex : Significance of the Pan-African event in East Antarctica," Proceedings of VII International Symposium on Antarctic Eath Sciences. (投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shiraishi, K.: "Amalgamation of East and West Gondwana : a view from Antarctica." Earth Monthly. (in Japanese), in submitting.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shiraishi, K., Ellis, D.J., Fanning, C.M., Hiroi, Y., Kagami, H.and Motoyoshi, Y.: "Re-examination of the Metamorphic and Protolith Ages of the Rayner Complex, Antarctica : Evidence for the Cambrian (Pan-African) regional metamorphic event." Proc.7th Intl Symp.Antarct.Earth Sci., Siena, Italy. (in submitting.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shiraishi, K., Kagami, H., and Yanai, K.: "Sm-Nd and Rb-Sr isochron ages for meta-trondhjemites from Cape Hinode, East Antarctica." Proc.NIPR Symp.Antarct.Geosci.8. 130-136 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Motoyoshi, Y., Ishikawa, M.and Fraser, G.L.: "Sapphirine-bearing silica-undersaturated granulites from Forefinger Point, Enderby Land, East Antarctica : Evidence for a clockwise P-T path?" Proc.NIPR Symp.Antarct.Geosci.8. 121-129 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Motoyoshi, Y., Ishizuka, H.and Shiraishi, K.: "Quantitative chemical analyzes of rocks with X-ray fluorescence analyzer : (2) Trace elements." Antarct.Record. 40, No.1 (in japanese with English abstract). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Motoyoshi, Y.and Shiraishi, K.: "Quantitative chemical analyzes of rocks with X-ray fluorescence analyzer : (1) Major elements." Antarct.Record. 39, No.1 (in japanese with English abstract). 29-37 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kagami, H., Owada, M., Osanai, Y., Shiraishi, K.and Hiroi, Y.: "Rb-Sr and Sm-Nd ages from the Highland Complex of Sri Lanka" Proc.Japan Academy. 71, Ser.B. 139-144 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ikeda, Y., Shiraishi, K.and Kagami, H.: "Geochemical characteristics of mafic dike rocks from the Sor Rondane Mountains, East Antactica." Proc.NIPR Symp.Antarct.Geosci.8. 49-64 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 本吉洋一: "蛍光X線分析装置による岩石の定量化学分析:(1)主要元素" 南極資料. 39. 29-37 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shiraishi,K.: "Cambrian Orogenic Belt in East Awtarctica and Sri Lanka:A Reply" Journal of Geology. 103. 469-471 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kagami,H.: "Rb-Sr and Sw-Nd ages from the Highland Conplex of Sri Lanka" Proceedings of the Japan Academy. 71. 139-144 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 本吉洋一: "蛍光X線分析装置による岩石の定量化学分析:(2)微量元素" 南極資料. 40. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Shiraishi,K.: "Sw-Nd and Rb-Sr isochron ages for meta-trond hjemites from Cape Hinode" Proceedings of NIPR Symposium on Antarctic Geusciences. 8. 130-136 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ikeda,Y.: "Geochewical characteristics of wafic dikevocks from the Sov Rondane Mts" Proceedings of NIPR Symposium on Antarctic Geosciences. 8. 49-64 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 本吉洋一・白石和行: "蛍光X線分析装置による岩石の定量化学分析:(1)主要元素" 南極資料. 39. 40-48 (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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