类地行星金属与硅酸盐分离机制的初步探讨

太阳星云的化学分馏和冷凝物质的吸积作用是形成类地行星原始金属核和原始硅酸盐幔的主要原因,在类地行星的演化过程中看来存在过原始金属核和原始硅酸盐幔之间的金属-硅酸盐的进一步调整。随着星体内部温度的不断增高,这种调整的机制可能是金属的热扩散;金属及金属-硫化物的部份熔融;金属-硫化物-硅酸盐的完全熔融和分异。这种调整的结果,使原始金属核里的少量硅酸盐被排到核外的硅酸盐幔中去,而原始硅酸盐幔中原先含有的金属和硫化物组分也将不断下沉而加入到原始内核中去。调整的最终结果导致了类地行星现有核-幔结构的形成。 

A PRILIMINARY STUDY ON MECHANISM OF METAL-SILICATE SEPARATION OF THE TERRESTRIAL PLANETS

It seems reasonable to assume the mechanism of metal-silicate separation between the initial cores and mantles of terrestrial planets during their thermal evolution process as thermal diffusion of Pe-Ni metals in solid state, partial melting of metals and metal-sulfides, and full melting and differentiation of metals, metal-sulfides and silicates. As a result of such metal-silicate redistribution, a small amount of silicate within the initial cores would move to the silicate mantles, and the metal-sulf ide components within the initial rock mantles would gradually sink to the cores, thus forming the final core-mantle struture patterns of terrestrial planets.