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Phase Stability and Hydroxyl Vibration of Brucite Mg(OH)2 at High Pressure and High Temperature
Chinese Physics Letters ( IF 3.5 ) Pub Date : 2021-03-25 , DOI: 10.1088/0256-307x/38/3/038101
Wei-Bin Gui , Chao-Shuai Zhao , Jin Liu

Brucite Mg(OH)2 is an archetypal hydrous mineral and it has attracted a great deal of attention. However, little is known about the evolution of hydroxyl groups in brucite with respect to subduction fluids. We carried out Raman measurements up to 15.4 GPa and 874 K via an externally heated diamond anvil cell, investigating the stability of brucite under the conditions relevant to subducting slabs. The hydroxyl vibration mode A 1_g(I) of brucite is weakened under simultaneous high pressure-temperature conditions. Meanwhile, the presence of carbonated solution can destabilize the hydroxyl groups of brucite at low pressure. Our results suggest that brucite releases water when reacting with hydrogen carbonate ion to form magnesite MgCO3 in subduction zones. This implies that the global water cycle is largely coupled with the deep carbon cycle in Earth’s interior.



中文翻译:

水镁石Mg(OH)2在高压高温下的相稳定性和羟基振动

水镁石Mg(OH) 2是一种典型的含水矿物,引起了广泛的关注。然而,关于俯冲流体中水镁石中羟基的演化知之甚少。我们通过外部加热的金刚石砧座进行了高达 15.4 GPa 和 874 K 的拉曼测量,研究了在俯冲板片相关条件下水镁石的稳定性。水镁石的羟基振动模式A 1_g (I) 在同时高压-温度条件下减弱。同时,碳酸溶液的存在会在低压下破坏水镁石的羟基。我们的结果表明,水镁石在与碳酸氢根离子反应形成菱镁矿 MgCO 3时会释放水在俯冲带。这意味着全球水循环在很大程度上与地球内部的深层碳循环相结合。

更新日期:2021-03-25
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