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1998 Fiscal Year Final Research Report Summary

Basic research for K-Ar dating of volcanic rocks up to 10ka

Research Project

Project/Area Number 09440177
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionOkayama University of Science

Principal Investigator

ITAYA Tetsumaru  Okayama University of Science, Research Institute of Natural Sciences, Professor, 自然科学研究所, 教授 (60148682)

Co-Investigator(Kenkyū-buntansha) HYODO Hironobu  Okayama University of Science, Research Institute of Natural Sciences, Lecturer, 自然科学研究所, 講師 (50218749)
Project Period (FY) 1997 – 1998
KeywordsQuarternary / volcanic rock / historical lava / K-Ar age / unusual argon isotopic ratio / mass fractionation / HP-VEE / laser heating
Research Abstract

This study is to analyze noble gase isotopes such as mainly argon extracted from extremely small amount of groundmass and phenocrysts separated from young volcanic rocks. To perfome it, We have purchased an laser probe heating apparatus and then carried out the basic experiments using it and the high precision incremental heating device with the temperature control system.
We have collected volcanic rocks including historical lavas systematicaly from Asama, Akagi, Miyakejima, Sakurajima, Satsuma-lwojima, Miharayama (lzu Ohshima) and Kyushu-Aso which have been documented well for their volcano stratigraphy. The rocks were studied petrographically and their groundmass and phenocrysts were separated for K-Ar analyses. Groundmass and phenocrysts were analysed using single grains or crystals. The results show that the analytical errors were ca. 40% for ^<40>Ar/^<36>Ar ratio and higher than 50% for ^<38>Ar/^<36>Ar one due to extremely small amount of argon content. In bulk groundmass analysis of the rocks using the resistance furnace, a mass fractionation for argon isotopes were detected because of small error less than 1%.
We reformed completely the former gas extraction and purification line and then performed a computer systems controlling automatically the signal detection and valve control. HP-VEE processing on Windows was used for the programming. The newly constracted extraction and purification lines were controlled using the system. The program for argon analysis using the peak height comparison method was also developed. All the analytical works are done on a computer. This unique analytical system using HP-VEE program will be reported somewhere soon. The base to proceed this research program was completed although K-Ar dating of rocks was not carried out. K-Ar dating result of rocks using the former mass spectormeter has been published in part.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 板谷徹丸: "地質学に貢献する放射年代学-日本の現状と展望-." 地質学論集. 49号. 107-120 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sawada, Y.: "K-Ar ages of Miocene Hominoidea(Kenyapithecus and Samburuptithecus)from Samburu Hills, Northem Kenya." C. R. Acad. Sci. Paris/Earth, Planet Sci.326巻. 445-451 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ekwueme, B. N.: "K-Ar ages of intrusive rocks in the Oban-Obudu massif and their significance for the tectonic and plvtonic history of Southeastem Nigeria." The Island Arc.6巻. 353-360 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morris, P. A.: "Age relations and petrology of alkali igneous rocks from Oki Dozen, Southwest Japan." Geochemical Journal. 31巻. 135-154 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Briggs, R. M.: "Geology and geochemistry of Gannet(Karewa)island, Tasman Sea : a rift-rekated nephelinitic tuff ring." NZ. Jour. Geol. Geophys. 40. 263-273 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morris, P. A.: "The Matsue Formation : Evidence for gross mantle heterogeneity beneath southwest Japan at 11Ma." The Island Arc. 6巻. 337-352 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tararin, I.A., Lelikov, E.P.and Itaya, T.: "Pleistocene submarine volcanism within the eastern part of Kuril Basin (Okhotsk Sea)." Doklady of Russian Academy of Sciences. (in press.).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hyodo, H., Miyauchi, K., Itaya, T.and Matsuda, T.: "Automated valve system for ultra-low blank rare gas extraction" Bull.Res.Inst.Nat.Sci.23. 17-23 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sawada, Y., Pickford, M., Itaya, T., Makinouchi, T., Tateishi, M., Kabeto, K., Ishida, S.and Ishida, H.: "K-Ar ages of Miocene Hominoidea (Kenyapithecus and Samburupithecus) from Samburu Hills, Northern Kenya." C.R.Acad.Sci.Paris. 326. 445-451 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sawai, O., Matsumura, N.and Itaya, T.: "K-Ar ages of volcanic rocks and gold deposits in the Hoshino gold area, northern-central Kyushu, Japan." Jour.Geol.Soc.Japan. 104(6). 377-386 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itaya, T.: "Rediometric chronology contributed to geology -a view in Japan." Mem.Geol.Soc.Japan. 49. 107-120 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kim, S.J., Lee, H.K.and Itaya, T.: "K-Ar ages and geochemistry for granitic and volcanic rocks in the Euiseong and Shinryeong area, Korea." Econ.Environ.Geol.30(6), (in press.).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morris, P.A.and Itaya, T.: "The Matsue Formation : Evidence for gross mantle heterogeneity beneath southwest Japan at 11Ma." The Island Arc. 6. 337-352 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Imaoka, T., Nishimura, Y., Goto, Y., Nakajima, K., Saito, K.and Itaya, T.: "Modes of occurrrence and K-Ar ages of Yamashima volcanic rocks in western San-in district, southwest Japan" J.Min.Pet.Econ.Geol.92(8). 302-315 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Briggs, R.M., Rosenberg, M.D., de Lang, P.J., Itaya, T., King, P.R.and Price, R.C.: "Geology and geochemistry of Gannet (Karewa) island, Tasman Sea : a rift-related nephelinitic tuff ring." NZ.Jour.Geol.Geophys. 40. 263-273 (1997)

    • 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 Journal. 31. 135-154 (1997)

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

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Published: 1999-12-08  

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