Commissariat à l'Énergie Atomique, Direction des Applications Militaires, Île de France, Arpajon Cedex, France.
Science. 2013 Apr 26;340(6131):464-6. doi: 10.1126/science.1233514.
Earth's core is structured in a solid inner core, mainly composed of iron, and a liquid outer core. The temperature at the inner core boundary is expected to be close to the melting point of iron at 330 gigapascal (GPa). Despite intensive experimental and theoretical efforts, there is little consensus on the melting behavior of iron at these extreme pressures and temperatures. We present static laser-heated diamond anvil cell experiments up to 200 GPa using synchrotron-based fast x-ray diffraction as a primary melting diagnostic. When extrapolating to higher pressures, we conclude that the melting temperature of iron at the inner core boundary is 6230 ± 500 kelvin. This estimation favors a high heat flux at the core-mantle boundary with a possible partial melting of the mantle.
地球的核心结构分为一个主要由铁构成的固体内核和一个液体外核。内核边界的温度预计接近铁在 330 千兆帕斯卡（GPa）下的熔点。尽管进行了大量的实验和理论研究，但对于铁在这些极端压力和温度下的熔化行为仍存在很少的共识。我们使用基于同步加速器的快速 X 射线衍射作为主要的熔化诊断方法，在 200 GPa 下进行了静态激光加热金刚石压腔实验。当外推到更高的压力时，我们得出结论，铁在内核边界的熔点为 6230±500 开尔文。这一估计值支持核心-地幔边界处存在高热通量的观点，这可能导致地幔部分熔化。
