Re-Osの同位体の証拠は,マッシフ型のアノルソサイトが地殻下部から生じたことを示している
Schiellerup1, Lambert, Prestvik
1Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology, Trondheim, Norway. henrik.schiellerup@geo.ntnu.no
Nature
|June 24, 2000
まとめ
マッシフ型のアノルソサイト,大型のプロテロゾイク期の岩性複合体で,おそらく大陸の地殻下部の融解から発生した. ノルウェーからのレニウム・オスミウム同位体データ
科学分野:
- 地質学 地質学 地質学
- 地質化学 地質化学
- ペトロロジー・ペトロロジーとは
背景:
- マッシフ型のアノルソサイトは,大きなモノミネラル型,プロテロゾイク時代の岩性複合体である.
- 彼らのマグマ源と地力学的な設定は依然として議論の余地があり,マントル由来または下層地殻の融解を含む仮説があります.
- ノルウェーのロガランド州 (Rogaland anorthosite province) は,このマグマチズムの若い例である.
研究 の 目的:
- マシフ型アノースサイトの親マグマの起源を調査する.
- 同位体データを用いて,マントル由来と下層地殻由来の仮説を検証する.
- ロガランド地方の地力学的環境を明らかにする.
主な方法:
- ロガランド州からのサンプルでレニウムとオスミウムの同位体の分析.
- 地殻の汚染と地殻下部の融解のモデルに対する同位体データの評価.
- ネオジムイソトープ値の評価について.
主要な成果:
- レーニウム-オスミウム同位体データは,親マグマの低地殻源を強く支持しています.
- マントル由来マグマの地殻汚染モデルは,観測された同位体データには合わない.
- オスミウムとネオジミウムの初期同位体値は,地殻下部の1,4001,550 Myr古いマフィック源岩の融解を示しています.
結論:
- ロガランド・アノートソサイト州の親マグマは,下層大陸の地殻の融解から生じた.
- 同位体証拠は,マントル由来マグマの大幅な地殻汚染を含むモデルを否定する.
- この発見は,マッシフ型アノースサイトの源泉メカニズムとしての下層地殻アナテキスを強く支持しています.
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