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a study on cosmogenic nuclides in the jilin meteorite and its irradiation history

Acta Geochimica 1982年第4期1卷 421-434页

作者：欧阳自远 G.HEUSSER Institute of Geochemistry Academia Sinica Max-Planck-Institut für Kernphysik

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 raregases of different *** have been found correlations among the spallogenic raregases,with apparent depth effects.43 samples were analyzed for their cosmogonic radionuc-lides;Co,;Al,;Cl,;K,;Mn,;Mn,and;*** have been found between;Co and;Mn and between;Co and;*** jilin meteorite has a complex history of cosmic-ray *** to the two-stage model and the other fragments have a burying depthtwo stages,T;=*** T;=*** burying depth of all samples in the parentbody can be obtained by the content of;*** meteorite No.1 is located 20—142 cm fromthe surface,No.4 ranges from 106—134 cm,and the other fragments have a burying depthbetween 15 and 150 *** equation of the reference plane for the surface of the 1-stagejilin meteoroid is 0.24x+0.81y+0.53z+0.5=*** can also be made of;Co to determinethe 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 *** its at-mospheric passage,the jilin had an ablation rate of ca.30%.On the basis of the two-stagemodel and the concentration of;Ne and;Co in the samples,we propose a scheme to restorethe relative position of all samples in the parent body.12 sample-distribution regions can besketched *** can be restored the relative position of all the samples in the parent bodyduring the two stages.

关键词： a study on cosmogenic nuclides in the jilin meteorite and its irradiation history

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