ペルーの南海岸沿いのプレカンブリア期後半の変形地下の20億年前の粒子が発見されました
まとめ
ウラン鉛による年代測定により,ペルーで20億年前のオロゲン現象が明らかになった. この古代の変形複合体は,現代の火山活動に影響を与え,ペルー・チリ溝に沿ったストロンチウム同位体比に影響を与えています.
科学分野:
- 地質学 地質学 地質学
- ジオクロノロジー (Geochronology) について
- ペトロロジー・ペトロロジーとは
背景:
- ペルーの沿岸地域には,高圧の粒状とチャルノキット状の成分を持つ中等級の変形複合体が特徴です.
- この複合体の地質学的歴史を理解することは,地域の地化学的異常を解釈する上で極めて重要です.
研究 の 目的:
- ペルーの沿岸地域の変形核の年齢を決定するために.
- 古代のオロゲン現象と最近の火山地化学との関係を調査する.
主な方法:
- ウラン-鉛 (U-Pb) の同位体年代測定は,変形岩の年齢を決定するために使用されました.
- 地化学分析,特にストロンチウム同位体比は,最近の火山活動を研究するために使用されました.
主要な成果:
- ウラン鉛のデータは,粒状核とチャルノキット核は,約20億年前のオロゲン現象と関連していることを示しています.
- この古代の粒状の地下室は,後期前カンブリア紀のオロゲニーによって改造されました.
- この古い地下室の存在は,最近のカルク-アルカリの火山で観察された高いストロンチウム同位体比を説明する重要な要因です.
結論:
- ペルーの沿岸の変形複合体は,20億年前のオロゲン現象に関連した,深いプレカンブリア時代の根源を持っています.
- プレカンブリア後期におけるこの古代地下室の改造は,現代の火山の地化学的特徴に影響を与えています.
- 古代のオロゲン現象と地下層の組成を含む地質史は,この地域の火山弧におけるストロンチウム同位体異常を理解するために不可欠です.
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