Ultra-high Pressure Earth Science of the Core and Core-Mantle Boundary

在这项研究中，我们利用金刚石砧细胞和多砧细胞两种类型的仪器澄清了地核-地幔边界发生的反应和地核的结构和性质。研究结果总结如下：1。我们澄清了金属铁和水在高达84 GPa和高温下的反应。在高于10gpa的压力和高于1000K的温度下，铁和水反应生成水合铁和氧化铁。这一反应在岩心形成阶段和现今的核幔边界具有重要意义。这一结果意味着氢可以并入地核。实验研究了金属铁与钙钛矿及后钙钛矿在3000 K、30 ~ 135gpa压力范围内的反应，这是真实的核幔边界条件。我们观察到在当前的压力和温度条件下，氧化镁形成，Si和0溶解到铁水中。这些元素的溶解度随压力和温度的升高而显著增加。在135 GPa和3500 K的核心条件下，研究了钾在铁水中的溶解。铁水溶解钾约为0.8 wt. %，目前的结果首次表明岩心中含有放射性成因钾，并能产生一定的放射性成因热。

In this study we clarified the reactions occurring at the Core-Mantle boundary and structure and properties of the Earth's Core using two types of apparatuses such as a diamond anvil cell and multianvil apparatus.The results can be summarized as follows :1.We clarified the reactions between metallic iron and water up to 84 GPa and high temperatures. At pressures above 10 GPa and temperatures above 1000K, Iron and water react to form iron hydrite and iron oxide. This reaction is important during the core formation stage and at the present core-mantle boundary. This result implies that hydrogen can be incorporated into the Earth core.2.We have studied experimentally the reactions between metallic iron and perovskite and post-perovskite in the pressure range from 30 to 135 GPa at 3000 K which is the real Core-mantle boundary condition. We observed formation of magnesiowusite and dissolution of Si and 0 into the molten iron under the present pressure and temperature conditions. The solubility of these elements increases with increasing pressure and temperature significantly.3.We studied the dissolution of potassium into the molten iron under the Core conditions of 135 GPa and 3500 K. Molten iron dissolves potassium about 0.8 wt. %, and the present results showed at first that the core can contain radiogenic potassium and can produce some radiogenic heat.