THE PROCESS OF THE FORMATION AND EVOLUTION OF THE JILIN METEORITE
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摘要: 在对吉林陨石进行多学科综合研究所取得的成果基础上,我们对吉林陨石的形成演化过程作了如下讨论:(1)太阳星云的凝聚过程:根据吉林陨石的凝聚和固化年龄和矿物的组合,探讨了太阳星云凝聚的过程;(2)吉林陨石母体的热变质过程:从稀有气体的丢失,全岩化学成分的特征,稀土元素的自纯化过程和橄榄石、斜方辉石成分的稳定性,讨论了热变质过程的特征;(3)吉林陨石母体的冷却过程:根据镍纹石的镍含量和宽度,还根据矿物中Ar和裂变径迹的保存性,分析了吉林陨石母体的冷却史;(4)吉林陨石母体的破碎和宇宙线照射历史:根据对宇宙成因He3、Ne20,21,22、Ar38、Na22、Al26、Mn54、Mn53和Co60的测定结果,提出了吉林陨石的两阶段照射历史的模式。第一阶段的吉林陨石母体,年龄10—11my,r=10m,确定了各样品在母体中的相对位置;第二阶段的吉林陨石母体,年龄0.3—0.5my,r=80—90cm确定了各样品的埋藏深度及通过大气层后的烧失量;(5)吉林陨石的降落过程:讨论了吉林陨星在太阳系空间和大气层中的轨道及降落过程。Abstract: On the basis of the data from a multi disciplinary integrated study of the Jilin meteorite,we have made a discussion on the formation and evolution of it involving the following aspects: (1) the fractionation-eondensation of the solar nebula,based on the condensation conglomeration age and the mineral association of the Jilin meteorite; (2) the thermoametamorphic history of the Jilin parent body,based on the data on the loss of rare gases,the chemical composition of the whole rock,the self-purification of BEEand the compositional stability of olivine and orthopyroxene; (3) the cowling process of the Jilin parent body,in reference to the Ni content and range of taenite as well as to the retention of argon and fission tracks in the minerals: (4) the breakup of the Jilin parent body and its cosmic ray irradiation history.Based on the measurements of the cosmogenic nuclides as He3,Ne20,21,22,Ar38,Na22,Al26,Mn54,Mn53,Co60 etc,a tw,o-stage model of irradiation history of the Jilin meteorite has been proposed.From the data on the Jilin parent body of the first stage (the age=10-11 my and r=10m) and that of the second stage (the age=0.3-0.5 my and r=80-90cm),we have defined the relative positions of the samples in the parent body,and their burial depths as well as the post-atmospheric loss on ignition,respectively; (5) the falling process of the Jilin meteorite,the orbits of the Jilin meteor in the solar system and in the atmosphere,and its falling process have been discussed.
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