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Petrolgy and geochemistry of Cenozoic igneous rocks in Northeast Japan arc

Research Project

Project/Area Number 59420015
Research Category

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

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

Principal Investigator

AOKI Ken-ichiro  Professor, Faculty of Science, Tohoku University, 理学部, 教授 (00004276)

Co-Investigator(Kenkyū-buntansha) ISHIKAWA Ken-ichi  Research Associate, College of General Education, Tohoku University, 教養部, 助手 (20158744)
KANISAWA Satoshi  Professor, College of General Education, Tohoku University, 教養部, 教授 (70005784)
FUJIMAKI Hirokazu  Research Associate, Faculty of Science, Tohoku University, 理学部, 助手 (90133933)
YOSHIDA Takeyoshi  Research Associate, Facultu of Science, Tohoku University, 理学部, 助手 (80004505)
ONUMA Kosuke  Professor, Faculty of Science, Tohoku University, 理学部, 教授 (50000865)
Project Period (FY) 1984 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥31,500,000 (Direct Cost: ¥31,500,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1984: ¥27,500,000 (Direct Cost: ¥27,500,000)
Keywordsnormalized incompatible element pattern / island arc volcanic rocks / active continental margin volcanic volcanic rocks / tholeiitic / 陸孤型 / 組成の時空分布と成因的考察 / ソレアイト / カルク・アルカリ / 玄武岩マグマ / ソレアイト系列 / カルクアルカリ系列 / 部分融解
Research Abstract

In order to elucite the geochemical characteristics and origin of igneous rocks in Northeast Japan arc, we have determined major elements of 2,000 and trace elements of 600 rock samples. The following several important conclusions have been clarified:
There are some chemical differences between the Pliocene to Quaternary and Miocene volcanic rocks even in the same regions. Namely, the latter do not have a nature of the typical island arc, but active continental margin. It seems likely that the change of chemical nature of magmas is related to the different tectonic setting, opening of the Japan Sea.
Quaternary volcanoes distributed widely are divided into four volcanic zones from the Pacific to continental side based on geological, petrographical and geochemical evidences.
Vlocanoes along the volcanic front consist of tholeiitic and calc-alkaline suites, both of which exhibit clearly different chemical and isotopic variation with eath other. It is suggested that two types of parental magmas have been generated in the upper mantle at different depths or from the common source but under different physic-chemical conditions.
Variations of the normalized incompatible trace element pattern are different between tholeiitic and calc-alkaline suites. Accordingly, it is very difficult to produce calc-alkaline andesites by simple magma mixing of tholeiitic basalt and its salic end product.
Not only alkalies and incompatible trace elements, but other major and compatible elements in volcanic rocks show the lateral variations across the arc as well.

Report

(2 results)
  • 1986 Final Research Report Summary
  • 1985 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Aoki,Ken-ichiro: Recent Progress of Natural Science in Japan,Science Council of Japan. 10. 89-92 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoshida,Takeyoshi;Aoki,Ken-ichiro: Science Report of Tohoku University,Series III. 16. 1-34 (1984)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 蟹沢聰史,吉田武義,青木誠一郎: 東北大核理研報告. 18. 403-413 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 吉田武義,大口健志,千葉とき子,青木謙一郎: 東北大核理研報告. 19. 163-177 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 佐々木寧仁,吉田武義,青木謙一郎: 東北大核理研報告. 19. 288-299 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 佐々木実,吉田武義,青木謙一郎: 東北大核理研報告. 19. 307-319 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Aoki, K.: "Petrology and geochemistry of the Quaternary volcanic rocks" Recent Progress of Natural Science, in Japan, Science Council of Japan. 10. 89-92 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoshida, T.; Aoki, K.: "Geochemistry of major and trace elements in the Quaternary volcanic rocks from Northeast Honshu, Japan" Sci. Rep. Tohoku Univ., Seri. <III> . 16. 1-34 (1984)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoshida, T.; Aoki, K.: "Photon-activation analysis of GSJ standard rocks." Res. Rep. Lab. Nucl., Tohoku Univ.18. 336-350 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Yoshida, T.; Masumoto, K.; Aoki, K.: "Photon-activation analysis of standard rocks using an automatic <gamma> -ray counting system with a micro-robot" Jour. Japan. Assoc. Min. Petr. Econ. Geol.81. 406-422 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岩石鉱物鉱床学会誌. 80-2. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 岩石鉱物鉱床学会誌. 80-4. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 東北大核理研報告. 18-1. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 東北大核理研報告. 18-1. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 東北大核理研報告. 18-2. (1985)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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