摘要
Metal grains in stony meteorites are relatively movable during thermal netamorphism(Wood,1967;Xie and Wang,1979;Xie,1986).In view of the fact that the Jilin meteorite is the largest in the world known up to now,its main body weighing 1770kg and its total volume amounting to 117×93×84cm^3,a de-tailed investigation into such a huge meteorite body would undoubtedly provide us with a lot of clues and information valuable in the study of the behavior of Fe-Ni metal during thermal metamorphism of meteorites.Our recent investigation has revealed that during thermal metamorphism of the Jilin chondirte fine Fe-Ni metal particles migrated easily by diffusion in solid state,and subsequently aggregated into metal nodules about 5-10mm in length,and the largest nodule we found is 30mm in size (Photo1).In this paper we present some new results of our study concerning the migra-tion and concentration of Fe-Ni metal in the Jilin chondrite on the basis of op-tical,SEM observations and high-temperature-high pressure as well as shock loading experiments.
Metal grains in stony meteorites are relatively movable during thermal netamorphism (Wood,1967;Xie and Wang,1979;Xie,1986).In view of the act that the Jilin meteorite is the largest in the world known up to now,its main body weighing 1770 kg and its total volume amounting to 117×93×84 cm^3,a de- tailed investigation into such a huge meteorite body would undoubtedly provide us with a lot of clues and information valuable in the study of the behavior of Fe-Ni metal during thermal metamorphism of meteorites. Our recent investigation has revealed that during thermal metamorphism of the Jilin chondirte fine Fe-Ni metal particles migrated easily by diffusion in solid state, and subsequently aggregated into metal nodules about 5-10 mm in length,and the largest nodule we found is 30 mm in size(Photo 1). In this paper we present some new results of our study concerning the migra- tion and concentration of Fe-Ni metal in the Jilin chondrite on the basis of op- tical,SEM observations and high-temperature-high pressure as well as shock loading experiments.
