在地球深层上层地幔的条件下,酸融化的密度
Kyoko N Matsukage1, Zhicheng Jing, Shun-ichiro Karato
1Department of Environmental Sciences, Ibaraki University, Mito, Ibaraki 310-0056, Japan. kmatsu@mx.ibaraki.ac.jp
Nature
|November 25, 2005
概括
在410公里深的水性酸盐融化密度是理解元素封存的关键. 水水水水水,这是一个很好的方法.
科学领域:
- 地质化学 地质化学
- 矿物物理 矿物物理
- 行星科学 行星科学
背景情况:
- 酸盐融密度控制着陆地行星中的化学演变和元素结合.
- 以前的研究集中在干上,这表明密度随着深层地幔的压力而增加.
- 预计深层地幔融会含有水,这可能会降低融密度.
研究的目的:
- 为了确定410公里深处水性酸盐化的密度.
- 在高压条件下评估水含量对融密度的影响.
- 评估410公里不连续性的融捕获和元素捕获潜力.
主要方法:
- 实验性确定酸融化密度.
- 高压和高温实验模拟地幔条件.
- 分析融的压缩性和水的作用.
主要成果:
- 酸溶液中的水具有很高的压缩性,在高压下降低其密度的效果.
- 水性酸盐的融化密度可以超过周围固体在约410公里的深度.
- 融化成分显著影响密度和可压缩性.
结论:
- 在410公里边界捕获水性融物存在一系列条件.
- 这种捕获机制允许在深层地幔中封存不兼容的元素.
- 了解融化成分和地幔状况对于预测元素分布至关重要.
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