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早期原生代超高压变形:微钻石的证据

Pierre Cartigny¹, Ingrid Chinn, K S Viljoen

¹Laboratoire de Géochimie des Isotopes Stables, Institut de Physique du Globe, UMR 7047, 2 Place Jussieu, F-75251 Paris, Cedex 05, France. cartigny@ipgp.jussieu.fr

Science (New York, N.Y.)

|May 8, 2004

概括

来自加拿大的微钻石表明,超高压变形发生在18亿年前. 这一发现表明,早期的地球潜水过程类似于现代板块构造学.

科学领域:

地质地质地质地质地质地
矿物学是什么?矿物学是什么?
地质化学地质化学

背景情况:

微钻石提供了对地球深层地质过程的洞察力.
加拿大努纳武特省的Akluilâk矿堤,拥有独特的钻石样本.

研究的目的:

调查来自Akluilâk矿堤的微钻石的起源和形成条件.
为了确定与钻石形成相关的地质年龄和构造环境.

主要方法:

分析微钻的特性,包括聚和同位素组成 (delta(15) N).
对Akluilâk矿堤和周围的Trans-Hudsonorogen进行了地质背景分析.

主要成果:

微型钻石具有高度的未聚合和正的三角值.
这些特征与钻石形成的潜变态岩石相比较.
证据表明,在18亿年前之前,在超高压下形成.

结论:

微钻石是在经过超高压变形的岩石中形成的.
这种变形发生在18亿年前之前,与跨哈德逊原有关.
这些发现表明早期的Proterozoic激活了Phanerozoic类型的降温过程.

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