吉林陨石雨物质成分研究并讨论其对地球起源和演化问题的启示

吉林陨石雨陨落面积近500平方公里(图1),搜集到陨石150余块,重近2700公斤,获得世界上最大的石陨石标本(吉林Ⅰ号陨石重1770公斤)。(照片1、2)。吉林陨石雨的陨石分布,由西而东在宏观上反映出一定的规律性:1.陨石标本由西而东,体积(或重量)逐渐减小(或少);2.陨石表面的气印由极发育到不发育直到极不发育,表面只有定向明显的流纹线;3.陨石表面由平滑到粗糙;4.陨石熔壳由厚变薄。

INVESTIGATION ON THE MATERIAL CONSTITUTION OF JILIN METEORITE SHOWER AND DISCUSSION ON ITS SIGNIFICANCE TO THE STUDY OF ORIGIN AND EVOLUTION OFTHE EARTH

This paper deals with the following aspects: 1. the distribution and morphological characteristics of specimens collected from the Jilin meteorites shower on 8 March 1976, 2. the determinations by various techniques showing the Jilin meteorites to belong to H-group chondrite and petrologically to chrysolite-bronzite chondrite, 3. the identification of orthopyroxene by the equation proposed on the basis of values of d420 and d610 from X-ray powder analysis, 4. comparison of the genesis of chondrule with that of casting stones, 5. the microstructure of the fusion crust of the meteorite, 6. the mb’ssbauer effect of minerals and the magnetic properties of the meteorite, 7. the degree of metamorphism and the evolutional history of the meteorite in connection with absolute dating, 8. the coexisting relationship between orthopyroxenes and olivines, giving the linear equation of Fs versus Fa, applicable to ordinary chondrates, 9. the mutual relationship between the meteorite shower and the moon, the earth and the sun, and 10. the properties of chemical bond of iron in meteorites and evolutional process of iron under discussion, considering as a criterion of study of stratified-substance and evolution of the earth.