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Received date: 2003-06-24

  Revised date: 2003-07-02

  Online published: 2003-08-01

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Xiao Xiantao,Sun Chengquan . [J]. Advances in Earth Science, 2003 , 18(4) : 643 -652 . DOI: 10.11867/j.issn.1001-8166.2003.04.0643

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