海底のゴミの流れが始まり,原始の大規模な地滑りから遠く離れた場所に堆積する
P J Talling1, R B Wynn, D G Masson
1Department of Earth Sciences, University of Bristol, Queens Road, Bristol, BS8 1RJ, UK. peter.talling@bris.ac.uk
Nature
|November 23, 2007
まとめ
巨大な潜水艦の地滑りが,これまでに記録された中で最も長い大規模な堆積物流を生み出します. これらの流れは,源泉から数百キロメートル離れた場所に沈殿物を堆積させ,深海にさえも沈殿させることができます.
科学分野:
- 地質学 地質学 地質学
- 海洋学 海洋学とは
- 堆積物学 堆積物学 堆積物学 堆積物学 堆積物学
背景:
- 海底の地滑りにより,巨大な堆積物で満たされた流れが生じ,堆積物は1,500kmまで広がります.
- これらの流れは膨大な量の堆積物を運んでおり,世界のすべての河川の年間負荷を合わせると上回ります.
- 潜水艦の流れの進化を直接監視することは困難です.
研究 の 目的:
- 巨大な潜水艦のゴミの流れを分析し,その形成と進化を理解するために.
- 潜水艦の流れが長距離にわたって沈殿物を変化させ,堆積させるメカニズムを調査する.
- 乱気流と瓦の流れの侵食と堆積の振る舞いを洞察する.
主な方法:
- 特定で広範囲の海底流出貯蔵庫の分析.
- 堆積物の特徴と海底の地形に基づいて流れのプロセスを再構築する.
- 観測された堆積物の特徴を,堆積物輸送の理論モデルと比較.
主要な成果:
- 地滑りから数百キロ離れたところから発生した巨大なゴミの流出堆積物の証拠は,流動堆積物の中に閉じ込められています.
- 海底の広大な広域で,沈殿物の堆積が最小限にある地域では,重大な侵食が発生しました.
- 沈殿物の堆積は,海底の傾斜 (0.05°から0.01°) の微妙な減少によって引き起こされた.
結論:
- 海底の乱流は,源から遠く離れたゴミの流れに変化し,広範囲の堆積物を形成します.
- 海底の微妙な傾斜の変化は,深海における重要な沈殿物の堆積を誘発する要因となり得る.
- 侵食性があり,最初はよく混ざった海底流は,微妙な斜面の断裂を超えて大きな破片流の堆積物を生み出すことができます.
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