火山と冥王星の平衡と大陸の地殻の分化
C Brenhin Keller1, Blair Schoene1, Melanie Barboni2
1Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544, USA.
Nature
|July 17, 2015
まとめ
地化学分析により,火山岩とプラトン岩は,潜水地帯では同様に,大陸の裂け目では異なることが明らかになった. フラクチャル結晶は地殻の融解ではなく,主にフェルシックマグマを形成する.
科学分野:
- 地化学
- ペトロロジー
- 地球科学
背景:
- 大陸地殻の進化は 地球の歴史の鍵です
- 地殻の異質性は,火山岩の地化学的比較を妨げています.
- フェルシックのマグマ形成には 微分化過程を理解することが重要です
研究 の 目的:
- 世界的に火山岩とプルトン岩の地化学的差異化傾向を比較する.
- 異なる地質学的な環境で中間とフェルシックのマグマを形成する過程を調査する.
- 地殻の分化に起因する主要なメカニズムを決定する.
主な方法:
- 火山とプルトンの全岩地化学の包括的なグローバルデータセットの分析.
- 主要元素と微量元素の差異化パターンの比較
- 異なる地質学環境におけるマグマの水分と噴出可能性の評価.
主要な成果:
- サブドクションゾーンの火山岩とプラトン岩は区別できない.
- 異なる傾向は大陸裂けの設定で異なっており,プルトンマグマの水分含有量が高いことを示唆している.
- 元素のパターンのオフセットは,乾燥した火山岩と比較して水性プラトン性マグマの噴火性の低下を示しています.
結論:
- 断片結晶は,潜流と裂け目環境の両方で,中間およびフェルシックのマグマを生成する主要なプロセスです.
- 地殻の融解はフェルシックマグマの形成にマイナーな役割を果たします.
- マフィック・カミュレットは 大陸地殻の分化による主要な残留物です
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