まとめ
今日,ペルーの大陸の縁に沿って,フォスフォライトの結節が活発に形成されています. シリアル・ウラン・デッティングにより,これらの堆積物が最近のものであることが確認され,生物的に豊かなこの地域では現在進行中の地質学的プロセスが強調されています.
科学分野:
- 海洋地質学 海洋地質学
- ジオクロノロジー (Geochronology) について
- バイオジオケミストリー バイオジオケミストリー
背景:
- 大陸の縁は,沈殿物の蓄積とダイアゲネシスの重要な場所です.
- 生物学的生産性のある地域は,異性鉱物の形成に影響を与える可能性があります.
- フォスフォライトの形成は,ゆっくりとしたプロセスであり,通常,長い地質的な時間スケールで起こります.
研究 の 目的:
- ペルー大陸の縁のフォスフォライトノードルの形成年齢を決定する.
- 現代の生産性の高い海洋環境における現在のフォスフォライト形成の速度を調査する.
主な方法:
- ウラン系 (U系) 年代測定法を使用した.
- 放射測定法による年代測定は,フォスフォライトノードルの年齢を決定するために使用されました.
主要な成果:
- フォスフォライトノードルの放射線年代は,プレイストセンの終わりから近年期までをカバーしています.
- 年代測定の結果は,研究領域で現在,フォスフォライトの形成が起きていることを示しています.
結論:
- ペルーの生物学的生産性の高い大陸の縁に沿って,フォスフォライトの結節が活発に形成されています.
- ペルー沖のような現代の海洋環境は,活発なリン酸塩生成を宿すことができます.
- この発見は,フォスフォライトの形成が,純粋に古生物学的な環境指標であるという仮定に異議を唱える.
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