ポリ結晶のダイヤモンドで記録されたクラトン石層における再動員
1Institut fur Geologische Wissenschaften, Universitat Greifswald, F. -L. Jahnstrasse 17a, D-17487 Greifswald, Germany. DeBeers Geoscience Center, Post Office Box 82232, Southdale 2135, South Africa. Department of Geology, Royal Holloway Universi.
Science (New York, N.Y.)
|August 19, 2000
まとめ
南アフリカの多結晶ダイヤモンドは,噴火の直前に古い炭素とシリケート材料の再動員を証明しています. これは,クラトン石層内の古代成分から最近のダイヤモンドの形成を示しています.
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
背景:
- キンベルライトは,ダイヤモンドを宿すことができる火山岩です.
- ダイヤモンドの起源と形成プロセスは複雑で議論の余地があります.
- ダイヤモンドの形成を理解することは,地球の深いプロセスへの洞察を提供します.
研究 の 目的:
- ベネチアのキンベルライトから多結晶ダイヤモンド (フレームサイト) の起源を調査する.
- フレームサイト形成に伴うタイミングとプロセスを決定する.
- これらのダイヤモンドの炭素とシリケート成分の源を理解するために.
主な方法:
- フレームサイト内のシリケート鉱物のイソトープおよび微量元素特性の分析.
- 石榴石の化学変化とダイヤモンドの炭素同位体との相関.
- エクロジットと炭酸塩溶融の相互作用のモデリング.
主要な成果:
- シリケート鉱物のデータは,古い炭素とシリケート成分のリモビライゼーションを示しています.
- 石榴石の化学的変異は,ダイヤモンドの炭素同位体と相関しており,同時に形成されたことを示唆しています.
- 同位体および微量元素の変動は,エクロジット-炭酸塩酸性溶融相互作用と一致しています.
結論:
- フレームサイトは,石層物質の再動員によってキンバーライト噴火直前に形成された.
- ダイヤモンドの形成には,エコロギットと炭酸塩溶融の相互作用が伴いました.
- ダイヤモンドは,クラトンの石層に保存された古代の物質から最近形成された.
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