ベースアルティックマグマのコンベクティブ移転中にプラジオクラズ鎖の形成
1Department of Geology and Geophysics, University of Connecticut, Storrs 06269, USA. philpotts@geol.uconn.edu
Nature
|July 14, 2000
まとめ
ホリオークの溶岩流は,
科学分野:
- 地質学 地質学 地質学
- 火山学 火山学とは
- ペトロロジー・ペトロロジーとは
背景:
- バサルト岩は,フェルドスパート結晶のネットワークのようなユニークな質感を示しています.
- コネチカット州とマサチューセッツ州のホリョーク・ラバ流は,顕著な結晶ネットワークを示しています.
- 以前の解釈では,この質感の起源として初期の結晶化と凝縮が示唆されていた.
研究 の 目的:
- ホリオークの溶岩流におけるフェルドスパート結晶のネットワークの起源を調査するために.
- マグマの固化と分化におけるこの質感の役割を理解するために.
主な方法:
- ホリョーク・ラバ流の下部からの玄武岩質感の分析.
- 高温で結晶ネットワークの持続性を判断するための加熱実験.
- 地質学的なフィールドエビデンス解釈.
主要な成果:
- 下流に存在するフェルドスパート・クリスタル・ネットワークは,実際には上方固化フロントで形成される.
- このネットワークは,密度の高い結晶のキノコの羽根の中で下方に運ばれます.
- これは,溶岩流におけるコンベクションのフィールド証拠を提供します.
結論:
- 下のホリョークの溶岩流で観察された質感は,上部の固化フロントから発生しました.
- 流動は,溶岩の固化と微分化において重要な役割を果たします.
- この研究は,マグマのコンベクションプロセスに関する重要なフィールド証拠を提供します.
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