熱クロノメトリーは,アルプス山脈の景観における侵食の向上の拡散を明らかにします
David L Shuster1, Kurt M Cuffey, Johnny W Sanders
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA. dshuster@bgc.org
まとめ
プレイストセンの氷河は,過去200万年にわたって,ニュージーランドのフィオルドランドの景観を完全に再構築しました. 侵食パターンは,氷床下の侵食率は氷の滑り速度に依存し,気候と構造を結びつけることを示唆しています.
科学分野:
- ジオモルフォロジー ジオモルフォロジー
- 氷河学 氷河学とは
- テクトニクス (地質学) とは
背景:
- 氷河の侵食は山脈を形成し,地質物理現象に影響を与えます.
- プレイストセンの氷河期への地形調整のタイミングと空間的なパターンは,十分に理解されていません.
研究 の 目的:
- ニュージーランドのフィオルドランドで地形進化を調査し,古典的な氷河の景色です.
- プレイストセンの氷河期が景観の発展に及ぼす影響を決定する.
主な方法:
- 熱クロノメトリー (U-Th) / He熱クロノメトリーを使用して,熱クロノメトリーデータを分析しました.
- 過去200万年における景観の進化を再現した.
主要な成果:
- プレイストセンの前の全景が侵食され,地形は根本的に形を変えた.
- 侵食は急な谷の部分に集中し,幹谷から排水盆の頭部に広がった.
- 観測された侵食パターンは,氷河下の侵食が氷の滑り速度に依存するモデルと一致しています.
結論:
- プレイストセンの氷河の侵食は,フィオルドランドの景観を大きく変えました.
- この発見は,気候,氷の動態,地球の表面形態学の複雑な相互作用を強調しています.
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