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《地质科学》 1998-03
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SHOSHONITIC SERIES:Sr,Nd,AND Pb ISOTOPIC COMPOSITIONS OF ORE BEARING PORPHYRY FOR YULONGCOPPER ORE BELT IN THE EASTERN XIZANG(TIBET)

Zhang Yuquan Xie Yingwen Qiu Huaning Li Xianhua(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640) Chung Sunlin (Department of Geology, Taiwan University, Taibei 10770)  
Some multi metallic deposits containing Cu,Mo,Pb,Zn,Au,Ag and Pt of the porphyry types such as middle types of Zalagar and Mangzong,large types of Doxarsumdo and Malasumdo and super large type of Yulong from the Yulong Copper Ore Belt(YCOB) are located in the middle part of Ailaosha Jingshajiang Cenozoic shoshonitic series magmatic rock belt in Eastern Tibet.Studies of the isotopic samples were conducted in the ore bearing porphyry and coexisting alkaline plutonic rocks and volcanic rocks.Sr,Nd and Pb isotopic compositions of orebearing porphyry and coexisting rocks have been analyzed in the isotopic geochemistry laboratory of Guangzhou Institute of Geochemistry,Chinese Academy of Sciences.Mass spectrum analysis for Sr,Nd and Pb isotopes was done by VG354. 87S/86Sr and 143Nd/144Nd ratios were standardized by 86Sr/88Sr=0119 4 and 145Nd/144Nd=0.348 417.Lead isotope ratios were determined using NBS981 as standard to calibrate mass discrimination,and the precision is about 0.02%.Analytical results show that the ore bearing porphyry and coexisting alkaline potassic plutonic rocks and volcanic rocks have very similar Sr,Nd and Pb isotopic compositions with variance range of 0,512 427-0.512 552 for 143Nd/144Nd,0.705 1-0.706 8 for 87Sr/86Sr,18.75-18.88 for 206Pb/204Pb,15.62-15.66 for 207Pb/204Pb and 38.90-38.99 for 208Pb/204Pb,which indicates that their material was originated from the same source region of mantle. Being partial overlap with Kerguelen in south Indian Ocean,most of the plots in Sr Nd,Pb Sr and Pb Nd correlation diagrams are concentrated and close to the East Africa Rift and appoximately close to the EMII end member of the mantle,which implies obvious difference from MORB and a metamorphic mantle derived source.Quantitatively modelling results suggest that mantle derived component (98.7%-99.2%) is much preponderant than crust derived one (0.8%-1.3%),which is compatible with the theories that crust derived contamination will be rare for the volcanic rocks and alkaline plutonic rocks.
【Fund】: 国家自然科学基金 中国科学院矿床地球化学开放实验室课题
【CateGory Index】: P597.2
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