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2002 Fiscal Year Final Research Report Summary

THERMAL PROCESSES OF SELSMOGENE ZONE REVEALED BY THERMOCHRONOLOGY

Research Project

Project/Area Number 12440137
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

TAGAMI Takahiro  KYOTO UNIVERSITY, ASSOCIATE PROFESSOR, 大学院・理学研究科, 助教授 (80202159)

Co-Investigator(Kenkyū-buntansha) YAMADA Ryuji  GRADUATE SCHOOL OF SCIENCE, DIVISION OF SOLID EARTH RESEARCH, NATIONAL RESEARCH INSTITUTION FOR EARTH SCIENCE AND DISASTER PREVENTION, RESEARCH FELLOW, 固体地球研究部門, 研究員
Project Period (FY) 2000 – 2002
KeywordsFISSION TRACK / THERMOCHRONOLOGY / EARTHQUAKE FAULT / PSEUDOTACHYLYTE / ZIRCON / NOSIMA FAULT
Research Abstract

(1) FT's were significantly shortened nearby a fault both in the University 500m borehole at the Toshima site and Geological Survey of Japan borehole at the Hirabayashi site. This suggests that rocks along the fault were reheated into the zircon FT' partial annealing zone, sometime after the initial cooling of the Ryoke granitic rocks.
(2) Zircon FT dating revealed that the reheating event took place at about 2 Ma for the University 500m borehole and at about 40 Ma for the Geological Survey of Japan borehole. The widths of reheated zones are about 3 m for the former and about 20 m for the latter. In conjunction with the deformation/alteration data of borehole rock, it is likely that the reheating was caused by the transfer and/or dispersion of hot fluids.
(3) Laboratory hydrothermal heating experiment revealed that the annealing kinetics is indistinguishable between atmospheric and hydrothermal conditions.
(4) A similar widespread zircon FT annealing was found for hanging wall of the Mozumi fault system.
(5) In the upper boundary fault of the Okitsu melange of the Shimanto accretionary complex. FT's were significantly annealed for over 3 km distant away from the fault plane.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] N.HASEBA: "Fission track ages of the Omine Acidic Rocks, Kii Peninsula, Southwest Japan"Geochemical Journal. 34. 229-235 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.HASEBE: "Exhumation of an accretionary prism -results from fission track thermochronology of the Shimanto belt, southwest Japan"Tectonophysics. 331. 247-267 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.TAGAMI: "Thermal anomaly around Nojima fault as detected by the fission-track analysis of Ogura 500M borehole samples"The Island Arc. 10. 457-464 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.MURAKAMI: "Ancient thermal anomaly of an active fault system : Zircon fission-track evidence of Nojima GSJ 750m borehole samples"Geophysical Research Letters. 29. 015679 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.TAGAMI: "(U-Th)/He geochronology of single zircon grains of known Tertiary eruption age"Earth Planetary Science Letters. 207. 57-67 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.HASEBE: "Geological partial annealing zone of zircon fission-track s stem : additional constraints from the deep dulling MITI-Nishikubiki and -Mishima"Chemical Geology. (in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hasebe, N., Suwargadi, B. W. and Nishimura, S.: "Fission track ages of the Dine Acidic Rocks, Kii Peninsula, Southwest Janan"Geochemical Journal. 34. 229-235 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hasebe, N. and Tagami, T.: "Exhumation of an accretlonary prism - results from fission track thermochronology of the Shimanto belt, southwest Janan"Tectonophys.. 331. 247-267 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagami, T., Hasebe, N., Kamohara, H. and Takemura, K.: "Thermal anomaly around Nojima, fault as detected by the fission-track analysis of Ogura 500M borehole sarnples"The Island Arc. 10. 457-464 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Murakami, M., Tagami, T. and Hasebe, N.: "Ancient thermal anomaly of an active fault system: Zircon fission-track evidence of Nojima GSJ 750m borehole samples"Geophys. Res. Lett.. 29,doi:10.1029/20O2GL015679. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagami, T., Farley, K. A. and Stockli, D. F.: "(U-Th)/He geochronology of single zircon grains of known Tertiary eruption age"Earth Planet. Sci. Lett.. 207/1-4. 57-67 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hasebe, N., Mori, N., Tagami, T. and Matsui, R.: "Geoological partial annealing zone of zircon fission-track system: additional constraints from the dccp drilling MITI-Nishikubiki and -Mishima"Chem. Geol.. in press. (2003)

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

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Published: 2004-04-14  

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