大陸の風化と粒子の海への輸送の長期の歴史
Don E Canfield1, Shuichang Zhang2, Ross N Mitchell3,4
1Department of Biology, University of Southern Denmark, Odense M 5230, Denmark.
まとめ
過去20億年の間に 大陸の気象と 粒子の海への移動が 大きく変化しました 地殻のダイナミクスと地質学的な活動が 主にこれらの長期的地化学的サイクルを制御していました
科学分野:
- 地化学
- 堆積物学
- 構造学
- 古代気候学
背景:
- 大陸の気象と粒子の輸送の 長期の歴史を理解することは 地球の元素の循環を解読するのに 極めて重要です
- 以前の研究はより短い時間スケールや特定の地質学期に焦点を当てており,プレカンブリアとファネロゾイク進化の知識にギャップを残しています.
- 海洋沈殿物の地化学的プロキシは 過去の大陸のプロセスに ユニークな窓を開くことができます
研究 の 目的:
- 過去20億年にわたる 化学的気象と 大陸から海洋への 粒子の移動の歴史を再構築する
- これらの過程における地質学的な活動,マントルの動態,および陸上の植物の進化の影響を調査する.
- 大陸と海の元素交換の進化を理解するための枠組みを確立する.
主な方法:
- 過去20億年の海洋堆積物におけるZr/Al,Rb/Al,Na/Alの比率の分析
- 現代の気象環境と海洋沈殿物の振る舞いを用いた地化学データの解釈.
- 地質学的記録のスペクトル分析で,地質学的な出来事に関連する周期的なパターンを特定する.
主要な成果:
- 2000年から6億5000万年前 (ミア),物理的な侵食が優勢で,化学的気象は現在のものに比べて効率が悪かった.
- 650万年後に,マントルのダイナミクスが気象と輸送を制御するようになった.
- 激しい沈殿期は,純大陸浸食と化学的気象変動の減少と相関し,沈殿期の減少は粒子の蓄積と気象変動の増大につながり,陸上の植物はこれらのサイクルに最小限の影響を及ぼした.
結論:
- 大陸の気象と粒子の移動は 過去20億年にわたって 主にマントルの動力学と地質学活動によって 支配されてきた.
- 大陸と海の間の地球の元素の循環を制御する上で重要な移行を記した.
- 陸上の植物は化学的気象の強度に影響を及ぼしたが,粒子輸送と貯蔵の基本的な周期的性質を変化させなかった.
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