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| Geochemical Characteristics of Trace Elements and Sulfur Isotopes of Sulfides from the Chenjiaba Cu-Pb-Zn Polymetallic Deposit, Lveyang County, Shaanxi Province |
| DING Kun1, WANG Rui-ting1,2, QIAN Zhuang-zhi1,3, LUAN Yan1,3, ZHANG Tian-yun4, FENG Yan-qing1, LI Yong-qin4 |
1. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054 China;
2. Shaanxi Mineral Resources Comprehensive Utilization Engineering Technology Research Center, Xi'an 710054, China;
3. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry Education, Xi'an 710054, China;
4. No. 711 Geological Team, Northwest Bureau of Geological Exploration for Nonferrous Metals, Hanzhong Shaanxi 723000, China |
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Abstract In order to explore the source of ore-forming materials and the genesis of the Chenjiaba Cu-Pb-Zn polymetallic deposit in the Mian-Lve-Yang ore-concentrated district, a geochemical study on REE, trace elements, and S isotopes of pyrite, chalcopyrite and sphalerite of the deposit has been carried out by using the ICP-MS and EA-IRMS instruments in this paper. The results show that the ore-forming elements, such as Cu, Pb, Zn, Ag, and Au etc. in pyrite are enriched comparing with the abundances of trace elements in the upper crust of the earth. It might reflect that the ore-forming elements were enriched in the ore-forming fluid. The Y/Ho ratios of pyrite (varying from 5.5 to 42) are similar to those of the quartz keratophyre, indicating the involvement of magmatic hydrothermal fluid in the mineralization. In addition, the pyrite has Co contents of 54.8×10-6-165.02×10-6 and Co/Ni ratios ranging from 1.29 to 5.95, indicating that the deposit was formed in a medium to low temperature environment by the early volcanic exhalative mineralization and late hydrothermal mineralization. Sulfur isotopes of sulfides vary from 4.88‰ to 8.90‰, indicating that sulfur could be sourced from the mixture of the brine sulfate and sea water sulfate.
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