シベリアのトラップの急速な噴火は,Permo-Triassicの境界でバサルトを洪水にする
まとめ
シベリアのトラップは,巨大な洪水ベースルト形成で,248百万年前に始まり,90万年以上にわたって急速に噴火し,マントルの羽根の起源を示唆しています. この火山活動がペルミア・トライア紀の大量絶滅と一致し,その因果関係が不確かになった.
科学分野:
- 地質科学は地質科学である.
- 火山学 火山学とは
- パレオントロジー・パレオントロジー
背景:
- シベリアのトラップは,地球最大の洪水ベースルト州の一つです.
- 噴火のダイナミクスを理解することは,大規模な火山の出来事を理解する鍵です.
研究 の 目的:
- シベリアのトラップス噴火の正確な年代を特定するために.
- 噴火率と潜在的な原因を決定するために.
- ペルミ・トライア紀の大量絶滅との時間的関係を調査する.
主な方法:
- レーザー加熱 (40) Ar/(39) Arジオクロノロジーは,玄武岩を年代測定するために使用されました.
- 噴火率は,噴火量と期間に基づいて計算されました.
- リトスフィアの裂け方に関する地質学的文脈が評価されました.
主要な成果:
- シベリア・トラップス・ベースルトの大部分は,90万年+/-80万年という短い間隔で噴火した.
- 噴火は,約2億4,800万年前に始まり,年間1.3km3を超えるペースで発生しました.
- 火山活動が重要な石層裂けに結びついていなかったため,圧縮解消融解が主な要因であると疑問視された.
結論:
- 高い噴火率は,シベリアのトラップのマントルプルームモデルを支持している.
- リトスフィアの裂け目によるマントルの減圧は,おそらく融解の主な原因ではありませんでした.
- シベリアのトラップス火山の発生時期は,ペルミアン・トライアスの大量絶滅期と密接に一致していますが,直接的な因果関係については,まだ未解決です.
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