オーストラリアプレートの漂流の急速な変化は,オントンジャワ高原との衝突を記録しています
Kurt M Knesel1, Benjamin E Cohen, Paulo M Vasconcelos
1Earth Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia. k.knesel@uq.edu.au
Nature
|August 8, 2008
まとめ
オントン・ジャワ高原 (オントング・ジャワ高原) とは
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)
- ジオクロノロジー (Geochronology) について
背景:
- オントン・ジャワ高原のような海洋高原は,プレート運動モデルに影響を与えます.
- 彼らの潜水の歴史を理解することは,プレート再編成の鍵です.
- 以前の研究では,オントン・ジャワ高原のメラネシアの溝衝突の正確なタイミングが欠けていた.
研究 の 目的:
- オントン・ジャワ高原とオーストラリアプレートとの衝突の歴史を解読するために.
- プレート運動に対する海洋高原沈殿の影響を評価するために.
- オントン・ジャワ高原がメラネジアの溝に到着するタイミングを制限するために.
主な方法:
- (40) Ar-(39) Ar オーストラリア東部のホットスポット火山の地表年代測定.
- タスマン海における海底山脈連鎖軌道偏移の分析.
- 地質年代データとプレート運動モデルとの相関.
主要な成果:
- 新しい地質年代測定データは,オントン・ジャワ高原の衝突とオーストラリア・プレート運動の間の関連性を明らかにしています.
- 北へのプレート移動の短期間 (26-23 Myr ago) の減少が確認されました.
- メラネジアの溝への高原の入り口の間にオーストラリアプレートの西向きの傾斜の証拠.
結論:
- オントング・ジャワ高原とメラネジアの弧との衝突は,オーストラリアプレートの短い西向きの傾きを引き起こした.
- このイベントは26万年前に発生し,トロブリアンド谷に沿って南西方向の沈殿を開始しました.
- 巨大な海洋高原は,プレート境界や移動において,地球規模で重大な変化を引き起こす可能性があります.
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