Water transport to the core-mantle boundary

• 作者: Michael J.Walter
• 来源期刊: 国家科学评论（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Special Topic:Key Problems of the Deep Earth
• 页码范围: 8-11
• 页数: 4页
• 语种: 英文
• DOI: 10.1093/nsr/nwab007

摘要

Water can have remarkable effects when exposed to rocks at high pressures and temperatures.It can form new minerals with unique properties and often profoundly affects the physical, transport and rheological properties of nominally anhydrous mantle minerals.It has the ability to drastically reduce the melting point of mantle rocks to produce inviscid and reactive melts, often with extreme chemical flavors, and these melts can alter surrounding mantle with potential longterm geochemical consequences.At the base of the mantle, water can react with core iron to produce a super-oxidized and hydrated phase, FeO2Hx, with the potential to profoundly alter the mantle and even the surface and atmosphere redox state, but only if enough water can reach such depths [1].