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Estimation of Primary Magma Composition of Esan-Aosoyama New Volcanic Front.

Research Project

Project/Area Number 63540640
Research Category

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

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionTohoku University

Principal Investigator

FUJIMAKI Hirokazu.  Tohoku Univ. Fac. Sci., Assoc. Prof., 理学部, 助教授 (90133933)

Co-Investigator(Kenkyū-buntansha) HASENAKA Toshiaki  ditto Assist. Prof, 理学部, 助手 (50202429)
AOKI Ken-ichiro  ditto Prof., 理学部, 教授 (00004276)
大沼 晃助  東北大学, 理学部, 教授 (50000865)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsNew volcanic front / Esan volcano / Aosoyama volcano / Low-K tholeiite / Low-K calc-alkali / Volcanic zone / HFS / スパイダ-グラム / 帯状配列 / 低Kソレアイト / 角閃石 / 軽石流 / ストロンチウム同位体組成 / 恵山-青麻山火山帯 / ストロンチウム同位体比 / 液相濃集元素 / 微量元素 / 地殻物質
Research Abstract

The Sr and Nd isotopic compositions for the 65 rock samples from Nanatsumori, Narugo, Onikobe volcanoes to clarify the isotopic nature of the new volcanic front and to examine whether the volcanic rocks of the new volcanic front follow the common chemical and isotopic regularities to the Quarternay volcanic rocks in Japan. The 87Sr/86Sr ratios of the same rocks from Nanatsumori volcano are as high as 0.7054, while the lowest ratio for them is 0.7047. It seems that the rocks can be divided into two groups in terms of Sr isotopic ratio. One has rather high ratios (0.7051-0.7054), and the other has low ratios (0.7047-0.7050). Only a few samples have intermediate ratios. The frequency distribution of each group forms Gaussian. In contrast, Narugo and Onikobe volcanoes erupted isotopically quite similar volcanic rocks. The rocks from Narugo volcano have 87Sr/86Sr ratios ranging from 0.070475 to 0.70505, while the ratios of those from Okikobe volcano are in 0.70477-0.70502. Both seem to have Gaussian distributions. The dacitic rocks of those volcanoes can be highly differentiated products of presumably basic magma. The basic magma is parental and have 87Sr/86Sr ratios of 0.7047-0.7051. On the other hand, some of the rocks from Nanatsumori volcano have similar ratios to those of the Narugo and Onikobe volcanoes, but some have higher ratios. The latter may imply crustal contamination to some extent. Therefore, the Sr isotopic compositions of the volcanic rocks from Esan-Aosoyama new volcanic front are consistent with lateral variation of the Sr isotopic composition of the Quarternary volcanic rocks in Japan and the parental magma of the new volcanic front must be related with the Pacific plate subduction.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 藤巻 宏和: "島根県隠岐、島後のミュジアライトのKーAr年代" 日本岩石鉱物鉱床学会誌. 84. 335-338 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 藤巻 宏和: "マグマの起源:地球化学的アプロ-チ" 火山. 34. 25-38 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 太田 岳洋: "大分県中部由布・鶴見火山群の地質と岩石" 日本岩石鉱物鉱床学会誌. 85. 113-129 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 新城 竜一: "中琉球粟国島、粟国層群東層の火山岩" 日本岩石鉱物鉱床学会誌. 85. 282-297 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 藤巻 宏和: "島根県隠岐、島後火山岩類のストロレチウム同位体組成の時間変化" 日本岩石鉱物鉱床学会誌. 86. 16-26 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Fujimaki, Hirokazu: "K-Ar dating of mugearites from Dogo, Oki island, Shimene prefecture, southwestern Japan" Jour. Mineral. Petrol. Econ. Geol.vol. 84. 335-338 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Fujimaki, Hirokazu: "The origin of magmas : Geochemical approach (I)" Kazan. vol. 2. 25-38 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Ohta, Takehiro: "Geology and petrography of Yufu-Tsurumi volcano group, Ohita prefecture" Jour. Mineral. Petrol. Econ. Geol.vol. 85. 113-129 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Shinjo, Ryuichi: "Petrology of volcanic rocks from the Higashi formation in Aguni-jima island, central Ryukyus" Jour. Mineral. Petrol. Econ. Geol.vol., 85. 282-297 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Fujimaki, Hirokazu: "Temporal variations of Sr isotopic compositions for the rocks from Dogo, Oki island, Shimane prefecture" Jour. Mineral. Petrol. Econ. Geol.vol., 86. 16-26 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 藤巻 宏和: "マグマの起源:地球化学的アプロ-チ" 火山. 34. 25-38 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 太田 岳洋: "大分県中部・由布鶴見火山群の地質と岩石" 日本岩石鉱物鉱床学会誌. 85. 113-129 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 新城 竜一: "中琉球粟国島、粟国層群東層の火山岩" 日本岩石鉱物鉱床学会誌. 85. 282-297 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 藤巻 宏和: "島根県隠岐、島後火山岩類のストロンチウム同位体組成の時間変化" 日本岩石鉱物鉱床学会誌. 86. 16-26 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 太田岳洋: "大分県由布・鶴見火山群の地質と岩石" 日本岩石鉱物鉱〓学会誌.

    • Related Report
      1989 Annual Research Report
  • [Publications] 藤巻,宏和: "マグマの発生:地球科学的アプロ-チ" 火山.

    • Related Report
      1989 Annual Research Report
  • [Publications] Fujimaki,H.Aoki,K.Hasenaka,T.: J.Mineral.Petrol.Econ.Geol.,. 83. (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Fujimaki,H.;Aoki,K.;Xu,H.: Contrb.Hineral.Petrol.112. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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