CHIME年代測定法とその造山帯形成過程解析への応用  [in Japanese] CHIME dating method and its application to the analysis of evolutional history of orogenic belts  [in Japanese]

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Author(s)

    • 鈴木 和博 SUZUKI Kazuhiro
    • 名古屋大学大学院理学研究科 Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University
    • 足立 守 ADACHI Mamoru
    • 名古屋大学大学院理学研究科 Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University
    • 與語 節生 YOGO Setsuo
    • 名古屋大学大学院理学研究科 Department of Earth and Planetary Sciences, Graduate School of Science, Nagoya University

Abstract

This paper outlines the CHIME (chemical Th-U-total Pb isochron method: Suzuki and Adachi, 1991a, b; Adachi and Suzuki, 1992) dating method and reviews its application to the event analysis of orogenic belts. The reviewed examples of the CHIME geochronology include (1) the electron microprobe observations of Pb diffusion in metamorphosed detrital monazites from high-grade Ryoke paragneisses (Suzuki et al., 1994), (2) the recycled Precambrian clastic materials from the Mino terrane (Adachi and Suzuki, 1993, 1994), (3) the late Permian-early Triassic metamorphism and plutonism in the Hida terrane (Suzuki and Adachi, 1991b, 1994), (4) the relationship between the Hikami Granite and Siluro-Devonian clastic rocks in the South Kitakani terrane (Suzuki et al., 1992 ; Adachi et al., 1994), and (5) the denudation history of the high T/P Ryoke metamorphic belt (Suzuki and Adachi, 1998). The CHIME dating method is based on precise electron microprobe analyses of Th, U and Pb as low as 0.01wt.% in an area of 5um across within a single grain of compositionally ununiformed Th-and U-bearing accessory minerals like monazite and zircon. This method has an advantage of high spatial resolution, and provides a new vista on the study of igneous, metamorphic and sedimentary rocks that underwent complex thermo-tectonic history. Monazite is most suitable to the CHIME dating, since it shows a concordant Th-U-Pb relation, contains 5-20wt.% ThO<sub>2</sub> and 0.1-1.5wt.% UO<sub>2</sub> that can produce 0.01-0.06wt.% PbO during 50 Myr, and remains immune to significant Pb-loss during the sillimanite grade metamorphism ; it has great chronological potential for the analysis of the detailed sequence of geologic events.

Journal

  • Chikyukagaku

    Chikyukagaku 33(1), 1-22, 1999

    The Geochemical Society of Japan

References:  86

Cited by:  3

Codes

  • NII Article ID (NAID)
    110008679968
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    4678621
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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