钻石中的冰VII含:地球深层地幔中水性流体的证据
O Tschauner1, S Huang2, E Greenberg3
1Department of Geoscience, University of Nevada, Las Vegas, NV 89154, USA. olivert@physics.unlv.edu.
概括
天然钻石含有冰VII,揭示了地球的深处
科学领域:
- 地质化学
- 矿物学
- 地质学
背景情况:
- 地球深层的水库影响全球的水循环和元素流动性.
- 这些水库的构成和范围尚不清楚.
研究的目的:
- 在地球深处发现富含水的区域.
- 调查钻石中特定矿物质含量的作用.
主要方法:
- 在天然钻石中分析矿物质含量.
- 高压和高温的矿物物理.
主要成果:
- 冰VII是水的高压多态体,被确定为天然钻石中的含有物.
- 冰VII的存在表明钻石形成过程中的水性流体结晶.
- 在高压 (高达24 GPa) 时,冰层VII的含有仍然存在,保留了深层地球条件的证据.
结论:
- 钻石中的冰度VII是深层地幔中富含水的直接指标.
- 这些发现表明上层过渡区和660公里边界是重要的液体丰富区域.
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