ホーンブレンドの溶解と,オーソアンフィボール中のカリクムの溶解度限界
まとめ
オーソアンフィボールからのホーンブレンドの排出は,ゲドライトで観察されました. このプロセスは,カルシウムによって駆動された.
科学分野:
- ミネラロジーは,鉱物学です.
- 地質学 地質学 地質学
- マテリアルサイエンス 材料科学
背景:
- オーソロンビックアンフィボールとモノクリニックアンフィボールの間の溶解は,結晶化学的および構造的差異のために長い間理論化されてきました.
- 以前の研究は間接的な証拠に依拠し,直接的な微細構造的観測が欠けていた.
研究 の 目的:
- アンフィボールの溶解に対する直接的な微細構造的証拠を提供するため.
- 溶解過程におけるカルシウム溶解性と構造的欠陥の役割を調査する.
主な方法:
- 送信電子顕微鏡 (TEM) は,高解像度イメージングに使用されました.
- 分析電子顕微鏡 (AEM) は,詳細な化学分析を提供しました.
- ニューハンプシャー州南西部のカルシウム豊富なゲドライト標本の検査.
主要な成果:
- フェロマグネシアン・オルトアンフィボールからのカルシック・クリノアンフィボール (ホーンブレンド) 溶液の直接的な証拠が特定されました.
- AEMのデータは,オルトアンフィボール構造内のカルシウムの低溶解限界を示しています.
- 溶解したホーンブレンドラメラは,数個の単位細胞から約80nmまでの厚さで異なった.
- 異質な核形成と (100) の堆積欠陥に沿っての成長で始まったラメラ形成.
結論:
- この研究は,微細構造レベルでアンフィボールの溶解を確認した.
- 堆積欠陥を生成する変形プロセスは,溶解部位を容易にする上で極めて重要です.
- オルトアンフィボールにおけるカルシウムの限られた溶解性は,ホーンブレンドの溶解を促します.
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