インドの構造プレートの急速な漂流

Prakash Kumar¹, Xiaohui Yuan, M Ravi Kumar

¹National Geophysical Research Institute, Hyderabad 500 007, India.

Nature

|October 19, 2007

まとめ

インドインドインドインド.

科学分野:

地質物理学地質物理学とは地質物理学です.
プレート・テクトニクス (プレート・テクトニクス)
ジオダイナミクスは地力学です.

背景:

Gondwanalandの分裂は1億4000万年前に始まり,インド洋の開きにつながった.
大陸の断片は,さまざまな移動性を示す; インドの高速は,ゴンドワナランドの残骸の中でユニークです.
以前の研究では,マントルの羽根が大陸の裂け目とそれに続くプレート運動に影響を与えたことを示唆しています.

研究の目的:

ゴンドワナランドの断片の異なる速度を決定する際に石層の厚さの役割を調査する.
裂け目の後のインドの急速な北方移動を制御する地動力学的プロセスを理解するために.

主な方法:

石層板の厚さを推定するために,シェア波受容器の機能分析を使用しました.
インド,アフリカ,オーストラリア,南極の石層の根深さを比較した.

主要な成果:

インドは,ゴンドワナランドの断片の中で最も薄い石層 (~100 km) を所有しています.
他の断片 (南アフリカ,オーストラリア,南極) は,かなり厚い石層の根 (180300 km) を有しています.

結論:

インドの薄い石化層は,ゴンドワナランド分裂後の急速な移動を容易にした可能性が高い.
マントルプルームの活動により,インドの石層が薄くなり,山脊の押し力やスラブの引力により移動性が向上した可能性がある.

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