パーミアン・トリアス期の境界危機とシベリアの洪水火山の間の同期と因果関係
まとめ
地球で最も深刻なペルミアン-トライアス絶滅は,シベリアの洪水火山活動と一致しました. 新しい年代測定は,この火山活動が約2.5億年前に始まり,大量絶滅を引き起こした環境変化を引き起こしたことを確認しています.
科学分野:
- 地質科学は地質科学である.
- パレオントロジー・パレオントロジー
- 火山学 火山学とは
背景:
- ペルム・トライアス紀の境界は,地球史上最も深刻な大量絶滅の出来事を示しています.
- シベリアの洪水噴火は,空中噴火で知られている最大の噴火事件であり,膨大な量の火山噴出物を放出しています.
- 火山活動と絶滅の間の正確なタイミングと因果関係を理解することは,古気候と古環境の研究にとって極めて重要です.
研究 の 目的:
- タフのサンプルを使ってペルミアン・トライアスの境界を正確に年代測定する.
- ペルム・トライアス境界の時期とシベリアの洪水火山の発生を相関させるため.
- 大量絶滅を誘発する火山活動による環境変化の潜在的役割を調査する.
主な方法:
- 中国南部から採取したタフのサンプルでアルゴン-アルゴン (40Ar/39Ar) 分析を用いた放射線年代測定.
- 火山噴出物の地化学分析により,噴火量と構成を理解する.
- 火山のエアロゾールと羽根のダイナミクスの影響を評価するための古気候および古環境モデリング.
主要な成果:
- 中国南部のタフのアルゴン・アルゴン年代測定により,ペルミアン・トライアスク境界の正確な年齢は250.0 ± 0.2百万年前とされた.
- この日付は,250.0 ± 0.3百万年前にシベリアの洪水火山活動の主段階の開始と同時期である.
- 火山由来の硫酸エアロゾールとシベリアの羽根の動態は,大量絶滅につながる極端な環境条件のドライバーとして関与しています.
結論:
- この研究は,シベリアの洪水火山活動とペルム・トライア紀の大量絶滅の間の直接的な時間的関連を確立している.
- 火山の放射能とその気候への影響は,この悲惨な出来事につながった環境の極端な状態を引き起こす重要な要因でした.
- 重要な地質学的および生物学的出来事のタイミングと因果関係を解明するために,正確な地質年代測定データは不可欠です.
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