地質学的な枠組みは,非海洋クレタシウス-三次期の境界地,ラトン盆地,ニューメキシコ,コロラド州の地質学的な枠組みです
まとめ
高濃度のイリジウムは,ラトン盆地における白亜紀と三次紀の境界で発見されました. この発見は,ラトン・フォーメーション内の特定の粘土石層と関連しており,重要な地質的なイベントを示しています.
科学分野:
- 地質化学 地質化学
- パレオントロジー・パレオントロジー
- 堆積地質学 堆積地質学とは
背景:
- クレタセウス-第3期 (K-T) の境界線は,地球の歴史における重要な絶滅の出来事を示しています.
- イリジウムの異常は,チクスルブ衝突事故などの地外衝突としばしば関連しています.
- 河川の堆積岩は,陸上の古生物学的な環境についてのユニークな洞察を提供します.
研究 の 目的:
- パリノロジカル・クレタセアス・テリシアル境界における異常なイリジウム濃度を調査する.
- ラトン盆地におけるイリジウム異常の地質学的文脈を特徴づける.
- 発見を潜在的地球外イベントマーカーと相関させるため.
主な方法:
- イリジウムの濃度を決定するために堆積岩のサンプルを地化学的に分析する.
- クレータ紀・三次紀の境界を正確に特定するためのパリノロジック分析.
- レイトン・フォーメーションの流動性沈殿岩のストラトグラフィック記録と記述.
主要な成果:
- アノマルの高いイリジウム濃度が,白亜紀と三次紀の境界で検出されました.
- イリジウム異常は空間的に薄いカオリン酸性粘土石の床と関連しています.
- この粘土石は,下部ラトン形成の連続しない炭酸性シェールと石炭の配列の中で発見されています.
結論:
- ラットン盆地で検出されたイリジウム異常は,地上の生態系に影響を与える地球外イベントの仮説を支持する.
- 特定の石質学 (カオリニット性粘土石,炭酸シェール,石炭) との関連は,堆積環境のヒントを提供します.
- この異常が北米におけるK−T境界イベントに及ぼす影響を完全に理解するために,さらなる研究が必要である.
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