• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Co-operative study of the oldest rocks of the Earth : essentials for the whole Earth history

Research Project

Project/Area Number 04302021
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 地質学一般
Research InstitutionSHIZUOKA UNIVERSITY

Principal Investigator

MASUDA Toshiaki  INSTITUTE OF GEOSCIENCES SHIZUOKA UNIVERSITY, ASSISTANT PROFESSOR, 理学部, 助教授 (30126164)

Co-Investigator(Kenkyū-buntansha) NOHDA Susumu  FACULTY OF LIBERAL ART, KYOTO-SANGYO UNIVERSITY PROFESSOR, 教養部, 教授 (30065841)
OTOFUJI Yoichiro  DEPARTMENT OF EARTH SCIENCES, KOBE UNIVERSITY, ASSISTANT PROFESSOR, 理学部, 助教授 (90160895)
ITAYA Tetsumaru  HIRUZEN RESEARCH INSTITUTE, OKAYAMA SCIENCE UNIVERSITY, PROFESSOR, 蒜山研究所, 教授 (60148682)
MARUYAMA Shigenori  DEPARTMENT OF EARTH AND PLANETARY SCIENCES, TOKYO INSTITUTE OF TECHNOLOGY PROFES, 理学部, 教授 (50111737)
WADA Hideki  INSTITUTE OF GEOSCIENCES SHIZUOKA UNIVERSITY, ASSISTANT PROFESSOR, 理学部, 助教授 (20126791)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥9,400,000 (Direct Cost: ¥9,400,000)
Fiscal Year 1993: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1992: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsGreenland / Isua / Oldest rocks of the Earth / Archaean / Metamorphism / Conglomerate / Pillow lave / Banded iron formation / メタチャート / 超塩基性岩 / マイクロブーディン構造 / イリジウム / イスア表成岩帯 / 地球史 / 太古代 / 38億年前 / 変成岩 / 地球外物質
Research Abstract

Strain analysis of the conglomerate showed that axial ratios of the strain ellipsoid is 3.73 and 1.23 in the XZ and YZ planes, respectively. The conglomerate before the deformation was restored by the de-straining technique, and found to be a pebbly mudstone. The deposition of the conglomerate is presumed to have taken place in deeper water environment than that previously considered. Five different lithologies are discriminated in the banded cherts : green, white, black gray and brown layrs. Anomalously large amount of lr was detected in a black layr by the INAA technique. Such high lr content suggests that anomalously large amount of extraterrestrial materials were accumulated in the early Archaean ocean. The banded iron formations were divided into five different lithologies : black, red, white, green and gray layrs, They commonly consists of quartz, magnetite, amphibole and carbonate. Their component are different from layr to layr. The depositional rhythm has not yet found out from the banded iron formation. Metamorphic zonation in the lsua region was proposed ; the region is divided into three zones on the basis of metamorphic mineral assemblages : amphibolite, amphibolite/greenschist and greenschist facies in the ascending order of metamorphic grade. Pyroxenes in the peridotite is found to be linearly arranged and boudinaged. These structures strongly indicate that the mantle convection in the early Archaean was much faster that that in Phanerozoic. The pillow lave conformably overlain by cherts has been discovered by the Japanese group. The pillow lava-chert assemblage is the same as the top of the present-day oceanic crust. This discovery suggests that the tectonic processes in the early Archaean is very similar to the plate tectonics active in the phanerozoic.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 丸山茂徳: "初期地球のテクトニクス-地球史研究の戦略と展望" 科学. 62. 175-184 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 増田俊明: "地球最古のBIF(縞状鉄鉱層)の縞:イスア,グリーンランド" 月刊地球. 15. 294-296 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 丸山茂徳: "Towards a new paradigm on the Earth's dynamics" Journal of Geological Society of Japan. 100. 1-3 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 深尾良夫: "Geologic implication on the whole mantle P-wave tomography" Journal of Geological Society of Japan. 100. 4-23 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 丸山茂徳: "Plume tectonics" Journal of Geological Society of Japan. 100. 24-49 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 熊沢峰夫: "Whole Earth tectonics" Journal of Geological Society of Japan. 100. 81-102 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 丸山茂徳: "46億年地球は何をしてきたか?" 岩波書店, 134 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigenori Maruyama: "The early tectonics of the Earth : strategy and prospect for the study of the Earth history" Kagaku. Vol.62. 175-184 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Toshiaki Masuda: "Bands of the oldest BIF (banded iron formation) of the Earth, Isua, Greenland" Chikyu Monthly. Vol.15. 294-296 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigenori Maruyama: "Towards a new paradigm on the Earth's ddynamics" Journal of Geological Society of Japan. vol.100. 1-3 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Yoshio Fukao: "Geologic implication on the whole mantle P-wave tomography" Journal of Geological Society of Japan. vol.100. 4-23 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigenori Maruyama: "Plume tectonics" Journal of Geological Society of Japan. vol.100. 24-29 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Mineo Kumazawa: "Whole Earth tectonics" Journal of Geological Society of Japan. vol.100. 81-102 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shigenori Maruyama: What does the Earth do for 4.6 billion years ?. Iwanami Syoten, 134 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 増田俊明: "地球最古のBIF(縞状鉄鉱層)の縞:イスア,グリーンランド" 月刊地球. 15. 294-296 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 丸山茂徳: "Plume tectonics" Journal of the Geological Society of Japan. 100. 24-49 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 熊沢峰夫: "Whole earth tectonics" Journal of the Geological Society of Japan. 100. 81-102 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 丸山茂徳: "Towards a new paradigm on the Earth's dynamics" Journal of the Geological Society of Japan. 100. 1-3 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 深尾良夫: "Geologic implication of the whole mantle P-wave tomography" Journal of the Geological Society of Japan. 100. 4-23 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 丸山茂徳: "46億年 地球は何をしてきたか?" 岩波書店, 139 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 増田 俊明: "地球最古のBIF(縞状鉄鉱層)の縞:イスア,グリーンランド" 月刊地球. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 丸山 茂徳: "グリーンランド、イスア地域の地質概要" 地質ニュース. (1993)

    • Related Report
      1992 Annual Research Report

URL: 

Published: 1992-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi