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In troductionRelatively old ages of chondrites(normally around 4.5 Ga)suggest that their parent bodies didnot experience any melt-fractionation under high temperature and high pressure conditions pertainingto the interior of terrestrial planets.Therefore,it is reasonable to take chondrites as starting materialsin the study of the chemical evolution of the early earth.The silicate phase in the Jilin chondrite(H5)was chosen for this purpose because it possesses a chemical composition similar to that of theprimitive mantle.
In troductionRelatively old ages of chondrites (normally around 4.5 Ga) suggest that their parent bodies didnot experience any melt-fractionation under high temperature and high pressure conditions pertaining to the interior of terrestrial planets.Therefore, it is reasonable to take chondrites as starting materials in the study of the chemical evolution of the early earth. silicate phase in the Jilin chondrite (H5) was chosen for this purpose because it possesses a chemical composition similar to that of the primate mantle.