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《Geoscience》 2014-01
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Geology and C,O,S and Pb Stable Isotope Geochemistry of Lamasayi Cu Deposit in Western Tianshan,Xinjiang,China

DUAN Shi-gang;XUE Chun-ji;SHI Hai-gang;LI Ye;JIA Zhi-ye;MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences;Airborne Survey and Remote Sensing Center of Nuclear Industry;China Aero Geophysical Survey and Remote Sensing Center for Land and Resources;  
The Lamasayi copper deposit is a representative copper deposit in the Sailimu massif in Western Tianshan,Xinjiang,China. However,the genesis of this ore deposit is controversial. This study tries to discuss the problem through tracing the origin of ore forming material using stable isotopes of C,O,S and Pb and investigating the geological characteristics of the Lamasayi copper deposit. The δ13C values of gangue calcite vary between-1. 04‰ and-0. 87‰ which are lower than those of wall-rock limestone( δ13C = 3. 51‰-5. 47‰); the δ18O values of gangue calcite are from 9. 33‰ to 9. 61‰ and are quite lower than those of normal marine carbonate( δ18O = 20‰-26‰). The C and O isotopic compositions reflect that the ore-forming fluid may be a mixture of magmatic water and ground water. The δ34S values of sulfides mainly vary from 3. 75‰ to 8. 64‰which is close to the sulfur isotope composition of the Hercynian porphyries( for example,the δ34S values of sulfides from the Dabate porphyry copper-molybdenum deposit are from 4. 9‰ to 7. 9‰) and which reflects that the sulfur may be originated mainly from porphyry. The Pb isotope compositions of chalcopyrite are from 18. 264 to 19. 544 for206Pb /204Pb,from 15. 575 to 15. 656 for207Pb /204Pb,and from 38. 103 to 38. 705 for208Pb /204Pb, respectively,which shows characteristic of two-stage abnormal lead and being rich in radiogenic lead,similar to the Pb isotope composition of the Hercynian porphyries( for example,the Dabate rhyolitic porphyry) and which also indicates that the ore-forming metal may be derived from the porphyry. In summary,the Lamasayi copper deposit may be skarn type deposit related to porphyry.
【Fund】: 中央科研院所基本科研业务费项目(K1202);; 国家科技支撑计划项目(2011BAB06B02);; 中国地质调查局工作项目(1212011085069);; 中央高校基本科研业务费项目(2009PY04)
【CateGory Index】: P618.41
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