中東エルリアン盆地,マングライウラン鉱床のサイハン群の起源と古沉積環境の再構築
Yisu Zheng1, Jianbing Duan2,3, Yonghua Lü4
1School of Earth Sciences, East China University of Technology, Nanchang, Jiangxi 330013, China.
ACS omega
|September 2, 2025
まとめ
マングライのウラン鉱床のサイハン・フォーメーションの地化学分析は,受動的な大陸の縁からのフェルシック岩源を明らかにしています. この研究は,乾燥状態から半乾燥状態まで,酸素に富んだ堆積状態を示しています.
科学分野:
- 地化学
- 堆積物学
- 経済地質学
背景:
- マングライウラン鉱床は,古代のウラン金属帯域の重要なエリアであるエルリアン盆地の東部のタベイサグ,マニット低地に位置しています.
- 下白紀サイハン形成の地化学的特性を理解することは,鉱床の形成環境と地質学的な設定を解読するために不可欠です.
研究 の 目的:
- サイハン山脈から採取した 粘土と泥石の地化学的性質を分析する
- マングライ鉱床の地質学的な設定,原産地方向,再酸化条件,そして古気候環境を決定する.
主な方法:
- 粘土と泥石のサンプル22の地化学分析.
- 稀土元素 (REE) と微量元素の分析
- 化学変化指数 (CIA) と組成変動指数 (ICV) の計算
主要な成果:
- 主に受動的な大陸の縁の岩から採取された沈殿物.
- LREEの濃縮とHREEの枯渇がサイハン群で観測された.
- 証拠によると,北部の源地地域 (チャガナオバオとウェイジング) からの派生は,地質学的な出来事と花岩磁石に結びついている.
- CIAとICVの値によって示された中等から激しい気象と比較的低い岩の成熟度.
- 微量元素の地化学は,乾燥から半乾燥,わずかに塩分があり,酸素が豊富な堆積環境を示しています.
結論:
- 地化学データは,マングライウラン鉱床のサイハン形成の起源,構造,堆積環境を制限しています.
- この発見は,古代の渓谷環境におけるウラン金属生成の理解に寄与する.
- この研究は,沈殿物の地化学と鉱石形成に及ぼす地域構造の進化の影響を強調している.
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