The formation and the evolution process of the Jilin meteorite
Based on the data from an integrated study by a multidisciplinary group on the Jilin meteorite, we discuss the following aspects concerning its formation and evolution: (1) The fractionation-condensation of the solar nebula was examined based on the condensation and solidification age and the mineral composition of the Jilin meteorite. (2) The thermometamorphic history of the Jilin parent body was discussed based on the data on the loss of rare gases, the chemical composition of the whole rock, the self-purification of rare-earth elements and the composition stability of olivine and orthopyroxene. (3) The cooling process of the Jilin parent body was analyzed according to the Ni content and the width of taenite, and the retentivity 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 He/sup 3/, Ne/sup 20,21,22/, Ar/sup 38/, Na/sup 22/, Al/sup 26/, Mn/sup 54/, Mn/sup 53/, Co/sup 60/ etc., a two-stage model of the irradiation history of the Jilin meteorite was proposed. From the data on the Jilin meteorite parent body of the first stage (the age = 10--11 MY and r = 10 m) and that of the second stage (the age = 0.3--0.5 MY and r = 80--90 cm). The relative positions of samples in the parent body, their burial depths as well as the post-atmospheric loss by ignition were determined. (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 were discussed.
- Research Organization:
- Institute of Geochemistry, Academia Sinica
- OSTI ID:
- 6239534
- Journal Information:
- Chin. Phys.; (United States), Journal Name: Chin. Phys.; (United States) Vol. 3:1; ISSN CHPHD
- Country of Publication:
- United States
- Language:
- English