Pbの同位体の変動は,海洋の島の玄武岩からの溶融インクルージョンで,ポリネシア,ポリネシア
1A. E. Saal, S. R. Hart, N. Shimizu, G. D. Layne, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. E. H. Hauri, Department of Terrestrial Magnetism, Carnegie Institution of Washington,
まとめ
塩基岩融解中の微量元素の変動性は,マグマの融解だけでなく,マグマの混合に関連しています. この研究は,インクルージョン内の多様な同位体組成を明らかにし,火山系における複数のマグマ源を示唆しています.
科学分野:
- 地質化学 地質化学
- ペトロロジー・ペトロロジーとは
- 火山学 火山学とは
背景:
- 塩基岩溶融インクルージョンの微量元素の変動性は,しばしば溶融プロセスに起因する.
- 海洋島の玄武岩 (OIB) は,マントルの異質性とマグマの進化に関する洞察を提供します.
研究 の 目的:
- オリヴィン主体のベースアルティック溶融インクルージョンにおける微量元素の起源と同位体の異質性を調査する.
- 融解プロセスやマグマの混合が観測された変動の原因であるかどうかを判断する.
主な方法:
- マンガイアとタハア,クック諸島とソサエティ諸島からの溶融インクルージョンにおける鉛 (Pb) の同位体組成の分析.
- 同位体データを説明するために,2つの成分混合モデルの適用.
主要な成果:
- 溶融インクルージョンは異質なPb同位体組成を示し,同質な噴火した溶岩と対照的です.
- 個々の溶融インクルージョン内のPbイソトープ組成の範囲は,世界的なOIB範囲の50%をカバーし,相当です.
- データは,各島の2つの成分混合モデルと一致しています.
結論:
- マグマの混合は,単なる融解プロセスではなく,塩基岩融解インクルージョンにおける微量元素の変動を生成する重要な要因です.
- 同位体的に異なるマグマは,溶融集積の前またはその間,火山の配管システムの中で共存していた可能性が高い.
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