| 西藏努日、程巴铜-钼-钨矿床硫铅同位素地球化学 |
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| 关键词:sulfur isotope lead isotope metallogenic element association source of ore-forming materials Nuri Chengba |
| 基金项目:国家973项目(编号: 2011CB403103);中国地质调查局青藏高原专项项目(编号: 1212010012005) |
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| Sulfur and Lead Isotopic Geochemistry of the Nuri and Chengba Cu-Mo-W Deposits in Tibet |
| The Nuri and Chengba deposits adjacent to the Yarlung Zangbo suture zone are two porphyry-skarn deposits occurring at the southern edge of the eastern Gangdise metallogenic belt. The metallogenic element combinations in these two deposits are Cu-Mo-W and Mo-Cu, respectively. In this paper, S and Pb isotopic compositions in main metal sulfides from the Nuri and Chengba deposits were studied to investigate the source of the ore-forming materials. The sulfur isotopic characteristics show that the δ34S values of sulfides from these two deposits vary in a narrow range and have obvious characteristics of tower-type distribution, which implies that the sulfur in the two deposits was mainly derived from the deep-seated magma; however, the sulfur isotopic composition of the Nuri mineral deposit shows a certain degree of variation in space, indicating that the buried magmatic rock mass occurred in an area near No.41 exploration line in this mining area. Ore lead isotopic composition indicates that the ore-forming metal materials of these two deposits were derived from both the mantle and the crust, but they were different in the crust-derived material source. The crust-derived materials in the Nuri ore deposit came from the crystalline basement of Lhasa block, while those in the Chengba ore deposit might have been derived from the substances of the Indian continental lithosphere during the continental collision between the India and the Asian continent. The ore-forming element combinations of the Nuri and Chengba deposits are consistent with their source features of ore-forming materials. Therefore, from south to north in the Gangdise metallogenic belt, the zonation of mineralization was caused by the different sources of crust-derived materials and different degrees of mantle-derived material contamination. |
| WANG Li-qiang,TANG Ju-xing,CHEN Wei,LUO Mao-cheng,JIANG Hua-zhai,ZHANG Kai.2014.Sulfur and Lead Isotopic Geochemistry of the Nuri and Chengba Cu-Mo-W Deposits in Tibet[J].Acta Geoscientica Sinica,35(1):39-48. |
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