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The trace element and isotope composition and their restriction on the origin mineralization matter of Laowangzhai gold ore deposit,Yunnan

YING Han-long, LIU Bing-guang (Institute of Geology Chinese Academy of sciences,Beijing 100029,China)  
The trace elements as Au,Ni and Cu of basalt,mineralization basalt,lamprophyry,mineralization are not simultaneouly rich in the Laowangzhai mine.Therefore it is indicated that the gold mineralization did not take place in the basaltic and lamprophyric magmatism and magmatic fluid process.The relative gold content in the mineralization wallrocks is high,and the Cu,Pb,Zn and Au are low.The δ18O of the mineralisation basalt,basalt,serious mineralization lamprophyry,thin mineralisation lamprophyry and serious mineralization lamprophyry are 10.5‰,8.7‰,11.1‰,14.7‰ and 11.2‰ separately.It is shown that mineralization fluid was not of meteroic origin,but added by fliud of meteroic origin at late mineralization stage.The(87Sr/86Sr)_i,ε_Nd(0) and f_Sm/Nd of the hydrothermal calcite are 0.721123±30,1.14 and 0.13 respectively,which are unanimous with the crust rocks formed in the ocean.
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