%0 Journal Article
%T Noble gas and cosmic-ray exposure age of Juancheng chondrite<br>
%A Daode Wang
%A Ruitian Wang
%A <br>
%J 科学通报(英文版)
%D 1999
%I 
%X The analytical results of noble gase in recently fallen Juancheng chondrite indicate that cosmic-ray ages of cosmogenic nuclei of3He,21Ne and38Ar are 5.1, 5.0 and 5.8 Ma, respectively, averaging 5.3 Ma. The gas retention ages radiogenic nuclei of4He and40Ar are 3 200 and 4 200 Ma, respectively. The average cosmic-ray age shows that it has occurred at breakup of the meteoroid from its parent body by impact before 5.3 Ma.
%K noble gas
%K cosmic-ray exposure age
%K chondrite
%K Juancheng
%K Shandong<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=BACCE97A5D5DE8C56A84410CF5FB592F&yid=B914830F5B1D1078&vid=1AE5323881A5ECDC&iid=59906B3B2830C2C5&sid=4442BFF895478018&eid=4442BFF895478018&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=5