溶融反応の同位体指紋から衝突マグマティズムへの洞察

Kurt M Knesel¹, Jon P Davidson

¹Department of Earth Sciences, University of Queensland, Brisbane, Qld 4072, Australia. k.knesel@earth.uq.edu.au

Science (New York, N.Y.)

|June 22, 2002

まとめ

同位体的に異なる溶液は単一の源から形成され,ストロンチウム (Sr) の同位体は溶融反応を明らかにします. これは,ヒマラヤの白砂岩石の地化学的変化を説明する.

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
同位体地質学とは,同位体地質学である.

背景:

アナテキス,つまり岩石の溶け方によるマグマの形成は,地殻の進化に極めて重要です.
マグマの地化学を制御するプロセスを理解することは,地質学的な設定を解釈する鍵です.

研究の目的:

単一の源から,同位体的に多様な溶液がどのように生成されるかを調査する.
溶融の同位体組成と溶融反応との関係を確立する.
ヒマラヤの白砂岩石のバイモダル地質化学を説明するために.

主な方法:

グラニット系でのピストン・シリンダー実験.
ストロンチウム (Sr) の同位体組成の分析.
溶融反応のステイキオメトリック分析.

主要な成果:

単一の源の漸進的な溶解により,同位体的に異なる溶液が生成された.
Srの同位体組成と溶融反応ステキオメトリーとの間には相関が認められた.
ヒマラヤの白玉石には,明確な融解エピソード (脱水および流体流出) が推論された.

結論:

アナテックスのマグマの同位体シグネチャーは,自然系における溶融反応を効果的に推論することができます.
ヒマラヤのルコグラニートの地化学的双方向性は,単一のメタペリト源の様々な融解の歴史の結果である可能性が高い.

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