吉林陨石的熔融实验研究及其在地球化学中的应用

组成地球的初始物质很可能是IAB铁陨石及H群球粒陨石,非均匀吸积形成地球以后,除由岩浆分异作用使幔中金属-硫化物下沉到原始地核外,在还原条件下还有部分Fe是由橄榄石中的FeO还原为Fe0而提供的并加入于地核内.对于大的陨石母体,由于内部加热或其表面受冲击加热而发生熔融和岩浆分异,导致形成某些铁陨石及无球粒陨石或7型岩石类型的球粒岩石.实验产物中的Fe-Ni-S相可作为判别宇宙球粒的标志之一. 

Experimental Study on Melting of the Jilin Meteorite and Its Application in Geochemistry

The primitive Material which the Earth consists of is probably IABiron meteorite (core of the Earth) and H-group chondrite (mantle of the Earth). When the experimental temperature is higher than 1300℃, noticeable magmatic differentiation took place in the Jilin chondrite, and this is quite similar to the process of the formation of the core and mantle of the Earth. The metal-sulfide components within chondrite would sink to the core. During melting and recry-stallization of the Jilin chondrite the partial FeOin olivine can be reduced and Fe0 formed. These metal Fe also would move to the core.Some large parent meteorite bodies seem to have undergone such a process leading to the formation of some iron meteorites and achondrites. The Fe-Ni-S phase in the experimental products may serve as a indicator in identifying the cosmic chondrules.