地殻におけるマグマの化学的分化,冷蔵,再移動
M D Jackson1, J Blundy2, R S J Sparks2
1Department of Earth Science and Engineering, Imperial College London, London, UK. m.d.jackson@imperial.ac.uk.
Nature
|December 5, 2018
まとめ
マグママッシュ貯蔵庫の反応性溶融流は,異なるマグマの形成と古い結晶の貯蔵を説明します. このプロセスは火山地質学と火山学における伝統的なマグマ室モデルに 挑戦しています
科学分野:
- 火山地質学
- 火山学
- 地化学
背景:
- 状マグマリズムの伝統的なモデルは,高溶解率の"マグマ室"パラダイムに依存しています.
- 最近のデータによると,マグマは溶解率の低い"マッシュ貯蔵庫"に貯蔵されている.
- 現存するモデルでは,地殻のマグマティズムのいくつかの一般的な特徴を説明できません.
研究 の 目的:
- 地殻のマッシュ貯蔵庫における反応性溶融流の役割を調査する.
- 化学的に異なるマグマの生成と 古い結晶の貯蔵を説明するために
- マグマの貯蔵と分化のための新しいパラダイムを提案する.
主な方法:
- マッシュ貯蔵庫内の反応性溶融流動性の分析
- 融解と結晶融解の反応のモデリング.
- モデルで生成された微量元素のプロファイルと自然の例を比較する.
主要な成果:
- 浮遊性溶融の浸透によって引き起こされる反応性溶融流は,マッシュ貯水池における重要なプロセスである.
- このプロセスは低結晶性,化学的に異なるマグマを生成し,上昇または噴出します.
- 反応性流は,異なるマグマとマグマ組成のバイモダリティの古い結晶の存在を説明します.
結論:
- マグマの貯蔵と分化は,主に長寿マッシュ貯蔵庫の反応性溶融流によって起こります.
- これはマグマ室における 長期にわたる 分割結晶化モデルに挑戦しています
- 反応性溶融流は,観測されたマグマ特性のより包括的な説明を提供します.
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