Phase Stability and Hydroxyl Vibration of Brucite Mg(OH)_(2) at High Pressure and High Temperature
Phase Stability and Hydroxyl Vibration of Brucite Mg（OH）2 at High Pressure and High Temperature作者机构：Center for High Pressure Science and Technology Advanced Research(HPSTAR)Beijing 100094China
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2021年第38卷第3期
页 面：111-115页
核心收录：
学科分类：081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0704[理学-天文学]
基 金：Supported by the National Key Research and Development Program of China(Grant No.2019YFA0708502)。
摘 要：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_(1g)(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 MgCO_(3) in subduction zones.This implies that the global water cycle is largely coupled with the deep carbon cycle in Earth’s interior.
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