由于在地球核心-地幔边界处的超离子过渡,缺乏脱水
Yu He1,2,3, Wei Zhang4, Qingyang Hu3
1State Key Laboratory of Critical Mineral Research and Exploration, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
深层地幔条件稳定了离子水 (H2O) 在水性阶段,如 δ-AlOOH. 这种超离子状态可以防止脱水,这表明地球深处可能存在长期的水库.
科学领域:
- 地质物理学 地质物理学
- 矿物物理 矿物物理
- 计算材料科学科学 计算材料科学
背景情况:
- 深水循环和水性阶段在极端压力和温度下的行为是不太了解的.
- 水和水性相在深层下层地幔中转化为超离子状态,但其对稳定性的影响尚不清楚.
研究的目的:
- 为了研究深层下层地幔条件下水性相对稳定性和脱水行为的超离子效应.
- 为了探索地球深处水的积累潜力.
主要方法:
- 一开始的分子动力学模拟.
- 深度学习潜力分子动力学模拟.
- 自由能量的计算.
主要成果:
- 在 δ-AlOOH 中发现了一种双重超离子过渡,具有高度扩散的和离子.
- 由于度增加,这种超离子状态使结构在140 GPa和3800 K稳定.
- 在深层下层地幔和核心地幔边界条件下观察到水结和不利的脱水动力学.
结论:
- 超离子水很可能在深层下层地幔中稳定且耐脱水.
- 地质时间可能会导致超离子水的积累,在地幔底部形成水库.
更多相关视频
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
12:02Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
Published on: November 3, 2017
相关概念视频
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Electrostatic Boundary Conditions
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
Electrostatic Boundary Conditions in Dielectrics
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Magnetostatic Boundary Conditions
Solubility Equilibria: Ionic Product of Water
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le Chatelier's...
Theory of Strong Electrolytes
