コロラド高原の継続的な上昇は,デラミネーション型のコンベクティブ・リトスフィアのダウンウェリングによるものです
A Levander1, B Schmandt, M S Miller
1Earth Science Department, Rice University, Houston, Texas 77005-1892, USA. alan@rice.edu
Nature
|April 29, 2011
まとめ
コロラド高原 コロラド高原
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- ジオダイナミクスは地力学です.
背景:
- コロラド高原は,北米の高地地域であり,大きな変形がないため,その上昇メカニズムは不明です.
- 周囲の州は,内部的に安定した高原とは異なり,圧縮および拡張的変形を経験しました.
- 以前の理論では,等位平衡が示唆されていたが,高原の持続的な高さを説明できなかった.
研究 の 目的:
- コロラド高原の下にある深層の石層構造を調査するために.
- 高原の上昇と高度の上昇に起因する地動力学的プロセスを理解する.
- グランドキャニオンの切断のような地表の地質学的特徴を,地球の深いプロセスと結びつけるため.
主な方法:
- 地震トモグラフィーと受信機の機能分析により,地下構造物の画像を撮影します.
- 石油学および地化学データの統合.
- プレオセンの玄武岩火山活動とグランドキャニオンの切断率の分析.
主要な成果:
- コロラド高原の中西部下部に200km以上の深さで広がる,深い,高速の異常を特定しました.
- 地震画像は,地殻の下部から70~90キロメートルの深さまで浸透するインターフェースを明らかにし,Moho.が上昇しています.
- これらの特徴を,下層地殻と石層の進行中のデラミネーションの証拠として解釈する.
結論:
- コロラド高原の上昇と関連するマグマティズムは,深層の石層の沈みによって引き起こされています.
- 過去の沈下現象は,プロテロゾーイク時代のテクトスフィアのマントルを水分化させ,弱めた.
- ケノゾーイクにおけるマグマの浸透は,下流と石層の除去を誘発し,数百万年にわたって徐々に高原を上昇させた.
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