チベット中部では少なくとも1350万年前から正常な断層が発生しています
P M Blisniuk1, B R Hacker, J Glodny
1Institut für Geowissenschaften, Universität Potsdam, D-14415 Potsdam, Germany. blisniuk@rz.uni-potsdam.de
Nature
|August 9, 2001
まとめ
チベットの中央部の正常な断層は少なくとも1350万年前に始まり,深い地動力学的プロセスと地殻の薄めによって引き起こされた高原進化のモデルを支えている.
科学分野:
- 地質学 地質学 地質学
- テクトニクス (地質学) とは
- 地質物理学 地質物理学とは地質物理学です.
背景:
- チベット高原の東西上層地殻の薄れは,地殻の潜在エネルギー増加や無関係な地力学プロセスを含むモデルによって説明されています.
- 変形のタイミングを決定することは,これらの構造モデルを評価するために非常に重要です.
研究 の 目的:
- チベットの中央部で正常な故障が発生するタイミングを決定する.
- チベット高原の進化に関する既存の構造モデルを評価する.
主な方法:
- ルビジアム・ストロンチウム (Rb-Sr) とアルゴン・アルゴン (40Ar-39Ar) の方法による鉱化年代測定.
- チベットの中央部の断層からのデータを分析する.
主要な成果:
- チベットの中央部のグラベンの形成の最低年齢は,およそ1350万年であると決定されました.
- 証拠によると,チベットのグラベンスの正常な断層活動が長期間続いたことが示唆されています.
結論:
- この発見は,通常の断層と亜高原の地力学過程を結びつけるモデルを裏付けている.
- 上層地殻の薄めは,チベット下の地殻と上層マントルの異質な変化による潜在的なエネルギーの増加によって引き起こされる可能性が高い.
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