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ネパールの中部のヒマラヤ山脈で,連続性外推力のアクティブな故障が発生

Cameron Wobus¹, Arjun Heimsath, Kelin Whipple

¹Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. cwobus@mit.edu

|April 23, 2005

まとめ

新しい証拠は,ネパールの中央部に活発な推力欠陥があることを示し,インド-ユーラシアの収束のための唯一の宿泊施設としてメイン・ヒマラヤ・スラスト (MHT) に挑戦しています. この発見は,ヒマラヤ山脈のフロントの北にあるより深い地形構造の活動を強調しています.

科学分野:

テクトニクスと地球物理学
ヒマラヤ地質学ヒマラヤ地質学
コスモジェニック・デート

背景:

インド・ユーラシア・プレート収束は,主にメイン・ヒマラヤ・スラスト (MHT) に起因する.
MHTの表面表現はネパールのシワリックヒルズで,地質学および地震データと一致しています.
代替モデルでは,北部の断層の滑り方を示唆し,既存のデータにも適合する.

研究の目的:

ネパール中部におけるインド・ユーラシアの収束の構造的適応を調査する.
メイン・ヒマラヤ・スラスト (MHT) 沿いでのみ,既存の変形モデルをテストする.
MHTの既知の表面表現の北にあるアクティブな断層を特定するために.

主な方法:

千年の時間スケールの侵食率を決定するために,in situ宇宙学的10Beの年代測定.
ネパールの中央部の岩石上昇のグラデーションの分析.
既存の40Ar-39Ar熱クロノロジーデータとの統合.

主要な成果:

ネパール中部で短い距離 (<2km) で侵食率の4倍の増加が検出されました.
これは,MHTの表面軌跡から約100km北にアクティブな推力欠陥があることを示しています.
岩石の上昇パターンは,MHTのランプの上での被動的輸送によってのみ説明されません.

結論:

高いヒマラヤ山脈の足下にある,深く根付いた,地表を突破する構造は,岩石を積極的に掘り起こしています.
これらの発見は,インド-ユーラシアの収束のための単一のMHTの適応モデルに挑戦しています.
気候,侵食,地質学との強い結合が,ヒマラヤ山脈の前線の北に変形を維持している可能性が高い.

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