日露フィールドセミナー'98に参加して「島弧の火山熱水系における鉱化作用:モデルから開発まで」

• 大和 裕

  東京大学大学院理学系研究科地質専攻

• 中西 哲也

  九州大学大学院工学研究科地球資源システム工学専攻

• 楫野 聡

  九州大学大学院工学研究科地球資源システム工学専攻

• 対馬 教夫

  北海道大学大学理学研究科地球惑星科専攻

書誌事項

タイトル別名

• An airborne electromagnetic survey for a Uranium exploration project in Arnhem land, Australia.
• ニチロ フィールドセミナー 98 ニ サンカ シテ トウコ ノ カザン ネッスイケイ ニ オケル コウカ サヨウ モデル カラ カイハツ マデ

抄録

In this paper, I introduce an example of an airborne electromagnetic survey for a uranium exploration project, focusing on the newly adopted data-processing method.<BR>In 1996, we performed an airborne electromagnetic survey for a uranium exploration project in Arnhem Land, Australia. The aim of the survey was to map conductive zones, which might be related to uranium mineralization. A major concern in airborne electromagnetic surveys in this area is the existence of a conductive near-surface layer, which is considered to mask deeper resistivity features. After performing some simulations, we confirmed that our target conductive zones could be identified by using a multifrequency airborne electromagnetic survey despite the existence of the relatively conductive surface in this area.<BR>In the data processing of the survey, we tried multi-element image-processing techniques, such as RGB compositi and image ratio operations, to cope with surface conductivity variations. That those processing results mapped basement conductive zones was supported by vertical electric sounding and confirmed by drilling.<BR>The application of these image-processing techniques to the survey data was also intended as a test of the suitability of these techniques for further multi-element intergrated analysis: combined analysis using several survey methods. The phrase "multi-element integrated analysis" refers here to the production of geological indicators from several types of (geophysical) data, which usually have different spatial density, accuracy and resolution, by analyzing them together statistically. Since a direct correspondence between geological features and observed geophysical survey data is rare, our final goal was to establish multi-element integrated anlysis as a tool for linking them. The trial described in this paper is the efirst step toward this goal.

収録刊行物

• 資源地質

  資源地質 49 (1), 71-79, 1999

  資源地質学会

キーワード

• Kamchatka
• Asacha
• Pauzhetka
• Mutnovsky
• Uzon Caldera
• Geysers Valley

詳細情報

• CRID: 1390001204470547968
• NII論文ID: 10002860629
• NII論文ID: 130003645455
• NII書誌ID: AN10379890
• DOI: 10.11456/shigenchishitsu1992.49.71
• ISSN: 21854033
• ISSN: 09182454
• NDL書誌ID: 4702914
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4702914
• 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