平板の形成と長寿における山頂の役割
Sanja Knezevic Antonijevic1, Lara S Wagner2, Abhash Kumar1
1Department of Geological Sciences, University of North Carolina at Chapel Hill, CB 3315, Chapel Hill, North Carolina 27599, USA.
Nature
|August 14, 2015
まとめ
ナズカ山脈はペルーの平らな岩盤の沈殿に不可欠であり,マントルの正常な下降を防ぐ. ララミド・オーロゲニーのような 過去の地質学的な出来事の洞察を 提供します
科学分野:
- 地理学
- 構造学
- 地質学
背景:
- フラット・スラブ・サブデュークションは,下降する構造板が水平になる場合,地殻の上昇と,板の境界から遠く離れた異常な火山活動に関連しています.
- 米国西部のララミド・オロジェニーのような過去の出来事は,古代の平板沈殿に起因する.
研究 の 目的:
- ペルー最大の近代的な平板を調査し,平板沈殿の形成と範囲を理解する.
- ペルーの平らな板の維持における ナスカ山脈の役割を決定する.
主な方法:
- レイリー波の相速度の分析
- 地震の移転が改善されました
- 地質学的データの解釈
主要な成果:
- ナズカ山脈は約90kmの深さで水平スラブの発展とサポートに不可欠です.
- 平らな板は山頂上では最も浅く,北西に沈んで裂け始め,正常な沈下を再開する.
- 斜面の存在は必要ですが,平板の形成には不十分です.その除去は,その失敗に十分です.
結論:
- ペルーの平板の進化の概念モデルが提案され,溝の撤退,吸い込み,山頂の沈下が含まれています.
- この発見は,ララミドオロゲニーやその他のフラットスラブ現象の開始と停止に関する新しい制約を提供します.
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