鉱床の年代測定の最近の進展 (1991年度日本地球化学会奨励賞受賞記念)  [in Japanese] Recent developments in dating mineralizations  [in Japanese]

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Author(s)

    • 中井 俊一 NAKAI Shun'ichi
    • 東京大学理学部地殻化学実験施設 Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo

Abstract

Recent developments in dating two types of deposits, Mississippi Valley-type (MVT) deposits which are related to crustal fluid flow and rare-earth deposits, are reviewed here. The MVT deposits are epigenetic carbonate-hosted Pb-Zn deposits. They have concealed their precise ages in spite of many attempts using variety of techniques. The Rb-Sr method has been sucessfully applied to sphalerites from MVT deposis. The result indicated that mineralization in East Tennessee took place at 350-380Ma, which denies genetic linkage of the deposits to the late Paleozoic crustal fluid flow during the Alleghanian orogeny (320-250Ma). The application of this dating method will put reliable geochronological constraints on the formation of the MVT deposits and shed light on the genesis of the deposits. A new geochronometer using electron capture decay of <sup>138</sup>La has been applied to rare-earth rich minerals such as monazite, allanite and bastnaesite. The method allowed to determine an age of otherwise undatable bastnaesite in Gakara, Burundi.

Journal

  • Chikyukagaku

    Chikyukagaku 26(1), 51-61, 1992

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    110008679864
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    3780368
  • NDL Source Classification
    ME51(鉱物・鉱床)
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  NII-ELS  J-STAGE 
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