概括
在富含橄素的岩石中测量了爬行 (V*) 的激活体积. 结果表明V*与氧离子扩散有关,影响地幔粘度估计.
科学领域:
- 地质物理学 地质物理学
- 矿物物理 矿物物理
- 石化学 石化学是一门学科.
背景情况:
- 了解地球地幔的机械行为对于地力学过程至关重要.
- 橄是上层地幔中的主要矿物质,控制着它的风质.
- 在地幔岩石中的爬行变形受温度,压力和矿物成分的影响.
研究的目的:
- 在富含橄素的岩石 (杜尼特) 中确定爬行 (V*) 的激活体积.
- 为了研究V*和氧离子自我扩散之间的关系.
- 为了估计地幔应力,应变率和粘度与深度的变化.
主要方法:
- 压力差的爬行实验是在岩样本上进行的.
- 实验是在高温 (11001350°C) 和限制压力 (515 kbar) 下进行的.
- 爬行 (V*) 的激活体积是从实验数据计算出来的.
主要成果:
- 测量的V*值在10.6~15.4cm3/mol之间.
- 平均V*被确定为13.4厘米3/mol.
- 这个平均值接近于在olivine中预测氧离子自我扩散的平均值.
结论:
- 岩中爬行的激活体积与氧离子扩散机制一致.
- 将V*纳入流量方程,结合石数据,可以以深度估计地幔风学.
- 这项研究提供了对控制地幔粘度和变形的因素的见解.
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