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1996 Fiscal Year Final Research Report Summary

Geochemical evolution of lower crust in relation to formaiton of a marginal sea -An approach based on geochemistry of igneous rocks and their enclaves.

Research Project

Project/Area Number 06452094
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionShimane University

Principal Investigator

IIZUMI Shigeru  Interdisciplinaly Fac.Sci.& Eng., Professor., 総合理工学部, 教授 (80032639)

Co-Investigator(Kenkyū-buntansha) SHUTO Kenji  Niigata Univ.Faculty of Science., Professor., 理学部, 教授 (50143748)
AKASAKA Masahide  Interdisciplinaly Fac.Sci.& Eng., Professor., 総合理工学部, 教授 (20202509)
SAWADA Yoshihiro  Interdisciplinaly Fac.Sci.& Eng., Professor., 総合理工学部, 教授 (80196328)
Project Period (FY) 1994 – 1996
KeywordsSW Japan / Cretaceous / Granite / Basic rocks / Lower Crust / Sr isotope / Nd isotope / Neogenc Tertiury
Research Abstract

During the first and second years of this project, we established extraction method of Rb, Sr, Sm and Nd from powdered rock and mineral samples, and measuring methods of Sr and Nd isotope ratios using a thermal ionization mass spectrometer (MAT262), which has recently been installed in the Department of Geology. The mass spectrometer gave high precision Sr and Nd isotope data for international and domestic standard samples. These data have been summarized in three papers and have reported in the Memoirs of the Faculty of Science, Shimane University.
Using the mass spectrometer, we measured Sr and Nd isotope ratios of Cretaceous basic and intermediate intrusive and volcanic rocks in southwest Japan, and examined petrogenetic relationship betweeen these basic to intermediate rocks and voluminous Cretaceous felsic volcanic and intrusive rocks, which are widely distributed in southwest Japan. The basic to intermediate rocks show regional variations in initial Sr and Nd isotope ratios. The basic to intermediate rocks from the Sanyo Belt have high initial Sr and low initial Nd isotope ratios, whereas those from the San'in Belt have low low initial Sr and high Nd isotope ratios. This regional variations in Sr and Nd isotope ratios are comparable with that of the felsic igneous rocks in this district. These data indicate that magma sources of both basic to intermediate rocks and felsic rocks (mostly granitoid rocks), probably uppermost mantle and lower crust, were geochemically more enriched beneath the Sanyo Belt, compared with the sources beneath the San'in Belt.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Rezanov, A. I. ほか: "Rb Sr isochron ages of Cretaceous-Paleosene granitoid rocks in the central port of the Chugodu distrid, Soushued Japan" Jour, Geal, Soc, Jpan.100. 651-657 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taiosho, Y. ほか: "Preliminary result for the fin Nd whole rock age of the metomaplic rocks from North Pardie in the Napier Conplex, East Autarctica." Proc. NIPR. Sympo. Astorct. Geosci.7. 115-121 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Izumi, S. ほか: "Srisotope data of some GSJ reterence sanples." Mem. Fac. Sci., shimane Univ.28. 83-86 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kagami, H. ほか: "Sm-Nd isochron ages of matic igheous rocks from the Ryoke Belt, so ush west Japan, Remicy of Juroisic is heous activity in a late Crataceovs granitic terane." GeochemiCal J.29. 123-135 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加々美寛雄ほか: "瀬戸内・近畿領家帯地域に分布するジュラ紀〜中新世火成岩類のSr. Nd同位体比の変遷" 地質学論集. 44. 309-320 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Izumi ; S. ほか: "Nd isotope data for GSJ refereuce sanoles, JB-la, JB-3 and JG-la and the La Jolla standard." Mem. Fac. Sci. shimaue Univ.29. 73-76 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Rezarov, A, I. ほか: "A Rb-Sr whols rock isoilion age ot the Gozu Granite, Niigata Prefecture, central, Japan" Jour. Geal. Soc. Japan.102. 828-832 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 飯 泉 滋 ほか: "表面電離型質量分析計MAT262による岩石・鉱物試料のSr・Nd同位体組成の測定" 島根大学地球資源環境学研究報告. 15. 153-159 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morris,P. M. ほか: "Age relations and petrclogy of alkolmigneces rocks from Oki Dozen, soubweit Japan." Geochomical J.(発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kim, Y. H. ほか: "Retrograply and geochschelogy of the Paleogenc Deokdong and Girimga Granikes in edstevu part of the kyesngsong Basin kovea : Implicoton, for Eccenc oligacsue inginat in SE korea an JW Japan." Jodrauli of Japanese Assoc. Miu. Pet. Econ. Geol.(発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Rezanov, A.I., Kagami, H., and Iizumi, S.: "Rb-Sr isochron ages of Cretaceous-Paleogene granitoid rocks in the central part of the Chugoku district, Southwst Japan." Jour.Geol.Soc.Japan. 100. 651-657 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tainosho, Y., Kagami, H., Takahashi, Y., Iizumi, S., Osanai, Y.and Tsuchiya, N.: "Preliminary result for the Sm-Nd whole rock age of the metamorphic rocks from Mount Pardoe in the Napier Complex, East Antarctica." Proc.NIPR Symp.Antarct.Geosci.7. 115-121 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Iizumi, S., Maehara, K., Morris, P.and Sawada, Y.: "Sr isotope data of some GSJ reference samples." Memorirs of Fac.of Sci., Shimane Univ.28. 83-86 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kagami, H., Yuhara, M., Tainosho, Y., Iizumi, S., Owada, M.and Hayama, Y.: "Sm-Nd isochron ages of mafic igneous rocks from the Ryoke Belt, Southwest Japan : Remains of Jurassic igneous activity in a late Cretaceous granitic terrane." Geochemical J.29. 123-135 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kagami, H., Yuhara, M., Iizumi, S., Tainosho, Y., , Owada, M., Hayama, Y and Nureki, T.: "Temporal variation in Sr and Nd isotopic composition of Jurassic to Miocene igneous rocks in the Seto Inland Sea and Kinki Districts of the Ryoke Belt, Southwest Japan Arc." Memoirs of Geol.Soc.Japan. 44. 309-320 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Iizumi, S., Morris, P.M.and Sawada, Y.: "Nd isotope data for GSJ reference samples, JB-1a, JB-3 and JG-1a and the La Jolla standard." Memoirs of Fac.of Sci., Shimane Univ.29. 73-76

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Rezanov, A.I.: "A Rb-Sr whole rock isochron age of the Gozu Granite, Niigata Prefecture, central Japan." Jour.Geol.Soc.Japan. 102. 828-831 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Iizumi, S.: "Sr and Nd isotopic analyzes, using a thermal inonization mass spectrometer, MAT 262." Geoscience Rept., Shimane Univ.15. 153-159 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morris, P.A., Itaya, T., Iizumi, S., Kagami, H., Watling, R.J.and Murakami, H.: "Age relations and petrology of alkali igneous rocks from Oki Dozen, southwest Japan." Geochemical J.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kim, Y.H., Iizumi, S.and Kagami, H.: "Petrography and geochronology of the Paleogene Deokdong and Girimsa Granites in eastern part of the Kyeongsang Basin, Korea : Implications for Eocene-Oligocene magmatism in SE Korea and SW Japan." Japanese Assoc.of Min.Pet.Econ.Geol.(in press).

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

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Published: 1999-03-09  

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