主要な炭酸塩は,深く沈んだ海洋地殻から溶け出します
M J Walter1, G P Bulanova, L S Armstrong
1Department of Earth Sciences, University of Bristol, Queen's Road, Bristol BS8 1RJ, UK. m.j.walter@bris.ac.uk
Nature
|August 1, 2008
まとめ
ダイヤモンドインクルージョンは,沈殿した海洋地殻から発生した炭酸塩の融解が,地球のマントルの奥深くに形成されていることを明らかにします. これらの古代の融解は,数十億年以上にわたってマントルの地化学と地力学に影響を与えています.
科学分野:
- 地質化学 地質化学
- ミネラロジーは,鉱物学です.
- ペトロロジー・ペトロロジーとは
- ジオダイナミクスは地力学です.
背景:
- 地球のマントルの部分的な融解は,火山岩の地化学的多様性を生み出します.
- マントルの地化学貯蔵庫と地動力学的プロセスは,原発的な溶融の組成と関連しています.
- ダイヤモンドに含まれる鉱物含有物は,マントルの深層のプロセスについての洞察を提供します.
研究 の 目的:
- マントルの原始および進化した炭酸塩の溶解の組成を特定するために.
- マントルの地化学貯蔵庫を,ダイヤモンドインクルージョンを用いた地動力学的プロセスと結びつけるため.
- マントルの進化における沈殿した地殻の役割を理解するために.
主な方法:
- 実験的ペトロロジー
- ダイヤモンドの鉱物含有物の地化学分析
- トレースエレメントの豊富度計算
主要な成果:
- 炭酸塩の溶解から結晶化したジュイナダイヤモンドのシリケート鉱物含有物.
- 融解の挿入は,移行地帯の深さで炭酸化海洋地殻の融解を示しています.
- ガーネットの挿入は,原始的な炭酸石に似た進化した溶融から結晶化を記録しています.
結論:
- 沈殿した地殻から派生した炭酸塩溶液は,マントルの化学質量移転の重要なエージェントである.
- これらの溶解は,上層マントルと移行領域に永続的な化学的痕跡を残します.
- ダイヤモンドインクルージョンは,マントルの深層のプロセスと地殻とマントルの相互作用に関する重要な証拠を提供します.
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