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)

• 中井 俊一

  東京大学理学部地殻化学実験施設

書誌事項

タイトル別名

• Recent developments in dating mineralizations
• コウショウ ノ ネンダイ ソクテイ ノ サイキン ノ シンテン 1991ネンド

抄録

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 ¹³⁸La 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.

収録刊行物

• 地球化学

  地球化学 26 (1), 51-61, 1992

  一般社団法人日本地球化学会

詳細情報

• CRID: 1390001205742219008
• NII論文ID: 110008679864
• NII書誌ID: AN00141280
• DOI: 10.14934/chikyukagaku.26.51
• ISSN: 21885923
• ISSN: 03864073
• NDL書誌ID: 3780368
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3780368
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可