低融粘度使410公里不连续度以上的融倍增成为可能
Longjian Xie1,2, Denis Andrault3, Takashi Yoshino4
1Center for High Pressure Science & Technology Advanced Research, Shanghai, China. ddtuteng@gmail.com.
Nature communications
|April 4, 2025
概括
水性酸融化形成410公里不连续性以上厚厚的层. 融化的粘度较低,含水量增加,解释了地幔中单层或双层融化的形成.
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:
- 地震和磁数据显示,在410公里不连续度以上,30-100公里厚的酸盐化层存在.
- 一些地区呈现出两层不同的融化层,这归因于密度与周围地幔的相似性.
- 这些停滞的融层的形成机制和详细结构尚未完全理解.
研究的目的:
- 为了研究水含量对酸盐融粘度在高压下的影响.
- 阐明410公里不连续度以上的融化层的形成机制和结构变化.
- 为了解释单一厚厚的化层和双重化层"双重化"的观察现象.
主要方法:
- 高压,高温实验,以测量酸盐融的粘度.
- 分析地震和磁数据的分析.
- 1D有限元模拟地幔上升和脱水化的模拟.
主要成果:
- 在大约14 GPa时,观察到酸盐融粘度显著下降,因为水含量从15.5mol% H2O增加到31.8mol%.
- 发现低融粘度促进了快速融分离,似乎抵消了厚层的形成.
- 模拟表明,连续脱水融产生一个410公里以上的初级融层和一个在等地幔融密度的深度二级层.
结论:
- 随着含水量增加,水性酸盐化的粘度降低是化层动态的一个关键因素.
- 单厚层或双层的形成可以通过密度对比度和地幔上升速度的变化来解释.
- 这项研究为410公里不连续度以上的融化层的形成和结构提供了一个统一的模型.
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