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1993 Fiscal Year Final Research Report Summary

Temporal and apatial variations of the Cenozoic volcanic rocks from the Notrheast Japan

Research Project

Project/Area Number 03302022
Research Category

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

Allocation TypeSingle-year Grants
Research Field 地質学一般
Research InstitutionNiigata University

Principal Investigator

SHUTO Kenji  Niigata Univ., Faculty of Science, Professor, 理学部, 教授 (50143748)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Takeyoshi  Tohoku Univ., Faculty of Science, Assosiate Professor, 理学部, 助教授 (80004505)
KAGAMI Hiroo  OkaYama Univ., Inst.for Study of the Earth's Interior, Assosiate Professor, 地球内部研究センター, 助教授 (20108179)
NAGAO Takashi  Yamaguchi Univ., Faculty of Science, Assosiate Professor, 理学部, 助教授 (40136164)
TATEISHI Masaaki  Niigata Univ., Faculty of Science, Assosiate Professor, 理学部, 助教授 (00126426)
MIYASHITA Sumio  Niigata Univ., Faculty of Science, Assosiate Professor, 理学部, 助教授 (60200169)
Project Period (FY) 1991 – 1993
KeywordsVolcanic history / Northeast Japan arc / Southwesr Japan / Japan Sea back-arc basin / K-Ar age / Sr and Nd isotopes / The spreading of the Japan Sea / Source
Research Abstract

The results obtained from this research project are summarized as follows.
1) The excellent petrological investigations have been made for numerous Cenozoic volcanic rocks from various localities in the Kyushu, Chugoku Hokuriku, northern Kanto, Tohoku and southwestern and northeastern Hokkaido discricts. Basaltic rocks dredged from the Okushiri Ridge, off western Hokkaido were also described prtographically. These petrological data may play an important role in revealing not only the origin of these volcanic rocks from each field but also the tectonic events around the circum Japan Sea region.
2) K-Ar age determination has been carried out for many Tertiary volcanic rocks, especially those from the Northeast Japan arc. Our new data and the available rediometric age data for the Tertiary volcanic rocks provided by many previous workers have made it possible to distinguish the three different volcanic fronts in the NE Japan arc in temporal and spacial distribution.
3) Based on Sr and Nd iso … More topic data for Tertiary and Quaternary basaltic rocks from the NE and SW Japan arcs, relationships are discussed between the temporal variation on magma source characteristics and the opening of the Japan Sea back-arc basin. Basaltic rocks from the back-arc side of the NE Japan arc during 35 0 Ma can be divided into two different groups with respect to initial Sr isotopic ratios, initial epsilonNd values and ages. One is characterized by higher Sri ratios (0.7040-0.7058) and lower epsilonNd values (0-+3) and the other by lower Sri ratios (0.7029-0.7040) and higher epsilonNd values (+3-+8). The former basaltic activity has taken place continuously during 30-10 Ma, whereas the latter activity occurred mainly in two periods ; i.e. ; at around 34-35 Ma and after 15 Ma. Similar evidences are also observed in basaltic rocks from the transitional zone to the back-arc side where basaltic activity characterized by higher Sri ratios took place continuously during 15-0 Ma, whereas that by lower Sri ratios occurred at around 15 Ma and after 3 Ma. These evidences suggest that the sub-continental mantle beneath the NE Japan arc may have constructed layred structure ; upper isotopically enriched (Sri=0.7040-0.7058, epsilonNd=0-+3) and lower depleted (Sri=0.7029-0.7040, epsilonNd=+3-+8) layrs. Basaltic magmas with enriched isotopic nature are considered to have been formed from the upper layr, while those with depleted isotopic one from the lower layr. Less

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Shuto Kenji: "Temporal variation of Sr isotopic compositions of the Cretaceous to Tertiary volcanic rocks from Okushiri Island,Northeast Japan Sea" 岩鉱. 87. 165-173 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shuto Kenji: "A Rb-Sr geo ehronological study on the Early Cretaceous Monai volcanie rocks from Okushiri Island,Hortheast Japan Sea." 岩鉱. 87. 510-519 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohki Jyun-ichi: "K-Ar ages of the Miocence Ryozen bascets from the northera margin of the Abukuma Highland,Japan" 岩鉱. 88. 313-319 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Watanabe Naoki: "K-Ar ages of the Miocene volcanic rocks from the Tomari area in the Shinokita Peninsula,Northeast Japan arc." 岩鉱. 88. 352-358 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohki Jyun-ichi: "Shifting of the volcanic fronts during Early to Late Miocene in the Northeast Japan arc." The Island Arc. 2. 87-93 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shuto Kenji: "The relationships between drastic changes in Sr isotope ratios of magma sousces beneath the N E Japan arc and the spreading of the Japan Sea back-arcbasin" Mineralogy and Petrogy. 49. 71-90 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuhiro Yamamoto: "K-Ar ages of the Tertiary volcanic rocks from Okushiri Island and the petrological characters of the Oligocene to Early Miocene volcanic rocks from the Northeast Japan arc and the surrounding areas" J.Min.Pet.Econ.Geol.86. 507-521 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Shuto: "K-Ar ages and petrologic characteristics of the Inase volcanic rocks from eastern part of the Kitakami district of Iwate Prefecture, Northeast Japan" J.Min.Pet.Econ.Geol.87. 20-34 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Shuto: "The niddle Miocene(16-12 Ma) volcanic activity in the Northeast Japan arc and tectonics" Commemorative Paper for Prof.Y.Maysumoto. 333-346 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Shuto: "The Middle Miocene icelandite-like dacites from the northern Abukuma district, Northeast Japan" Contrib.Dep.Geol.Min., Niigata Univ.7. 105-110 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Shuto: "Temporal variation of Sr isotopic compositions of the Cretaceous to Tertiary volcanic rocks from Okushiri Island, Northeast Japan Sea" J.Min.Pet.Econ.Geol.87. 165-173 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Shuto: "The relationships between drastic changes in Sr isotope ratios of magma sources beneath the NE Japan arc and the spreading of the Japan Sea back-arc basin" Mineralogy and Petrology. 49. 71-90 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jyun-ichi Ohki: "Sr and Nd isotopic compositions of the basaltic rocks(30-0 Ma) in the Northeast Japan arc" MAGMA. 86. 1-6 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jyun-ichi Ohki: "K-Ar ages of the Miocene Ryozen basalts from the northern margin of the Abukuma Highland, Japan" J.Min.Pet.Econ.Geol.88. 313-319 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Naoki Watanabe: "K-Ar ages of the Miocene volcanic rocks from the Tomari area in the Shimokita Peninsula, Northeast Japan arc" J.Min.Pet.Econ.Geol.88. 352-358 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jyun-ichi Ohki: "Shifting of the volcanic fronts during Early to Late Miocene age in the Northeast Japan arc" The Island Arc. 2. 87-93 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Shuto: "Evolving the continental arc volcanism into the island arc one - Temporal variation of the Tertiary volcanism in the Northeast Japan arc -." CHISHITSU NEWS. 464. 6-18 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jyun-ichi Ohki: "Middle Miocene bimodal volcanism by asthenospheric upwelling : Sr and Nd isotopic evidences from the back-arc region of the Northeast Japan arc" Geochemical J.(in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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