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The improved molybdenite Re-Os dating method and its application

LI Jing,SUN YaLi,HE Ke,XIAN WeiSheng,QIU JianJun and ZHANG Xu 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China 2.Graduate School of the Chinese Academy of Sciences,Beijing 100049,China 3.The Laboratory of Mineralization and Dynamics,Chang' an University,Xi' an 710054,China 4.Henan Provincial Bureau for Nonferrous Metal Mineral Resources,Zhengzhou 450052,China  
As a robust proxy,molybdenite has been widely applied to determination of Re-Os age.This study simplified the chemical separation of Re and Os using concentrated HNO_3 for digestion of molybdenite.Based on the negligible level of common 0s relative to radiogenetic ~(187)Os in molybdenite,a common Os standard was used as spike,and as a result,Os isotopic mass fractionation during ICP-MS measurements could be on-line corrected,improving the quality of analytical data This method was validated using national certified molybdenite standards,and the results were well consistent with the certified values.Using this method for determination of molybdenite sampled from Xingping skarn-type Mo deposit,Liangyang granite composite,reasonable Re-Os age data have been obtained.In practice,it is suggested to use enough amounts of molybdenite,which should be homogenized fine-grain in order to obtain representative Re-Os age.
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