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Geochemistry

, Volume 1, Issue 4, pp 421–434 | Cite as

A study on cosmogenic nuclides in the Jilin meteorite and its irradiation history

  • Ouyang Ziyuan 
  • G. Heusser
Article
  • 35 Downloads

Abstract

44 samples of the Jilin meteorite were analyzed by various laboratories for spallogenic, radiogenic, and trapped rare gases. A non-uniform distribution has been found for the rare gases of different origins. There have been found correlations among the spallogenic rare gases, with apparent depth effects. 43 samples were analyzed for their cosmogenic radionuclides60Co,26Al,36Cl,40K,53Mn,54Mn, and22Na. Correlations have been found between60Co and53Mn and between60Co and21Ne. The Jilin meteorite has a complex history of cosmic-ray irradiation. According to the two-stage model and the other fragments have a burying depth two stages,T 1=11 m.y. andT 2=0.3 m.y. The burying depth of all samples in the parent body can be obtained by the content of21Ne. Jilin meteorite No. 1 is located 20–142 cm from the surface, No. 4 ranges from 106–134 cm, and the other fragments have a burying depth between 15 and 150 cm. The equation of the reference plane for the surface of the 1-stage Jilin meteoroid is 0.24x+0.81y+0.53z+0.5=0. Use can also be made of60Co to determine the burying depth of all samples in the 2-stage Jilin meteoroid (under a geometry of 4π), and further to restore the preatmospheric form and size of the parent body. During its atmospheric passage, the Jilin had an ablation rate of ca. 30%. On the basis of the two-stage model and the concentration of21Ne and60Co in the samples, we propose a scheme to restore the relative position of all samples in the parent body. 12 sample-distribution regions can be sketched out. Also can be restored the relative position of all the samples in the parent body during the two stages.

Keywords

Ablation Rate Parent Body Depth Effect Cosmogenic Nuclide Cosmogenic Radionuclide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1982

Authors and Affiliations

  • Ouyang Ziyuan 
    • 1
  • G. Heusser
    • 2
  1. 1.Institute of GeochemistryAcademia SinicaChina
  2. 2.Max-Planck-Institut für KernphysikGermany

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