Isotope and fluid inclusion geochemistry of the Cangyuan Pb-Zn-Ag polymetallic deposit in Yunnan, SW China | |
Xian-Ze Deng; Yan Tao; Juan Li; Feng Xiong | |
刊名 | Ore Geology Reviews
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2017 | |
卷号 | 90页码:928-942 |
关键词 | Cangyuan Pb-zn-ag Deposit Isotope And Fluid Inclusion Geochemistry Magmatic-derived Fluids Sanjiang Orogen |
英文摘要 | The Cangyuan Pb-Zn-Ag polymetallic deposit is located in the Baoshan Block, southern Sanjiang Orogen. The orebodies are hosted in low-grade metamorphic rocks and skarn in contact with Cenozoic granitic rocks. Studies on fluid inclusions (FIs) of the deposit indicate that the ore-forming fluids are CO2-bearing, NaCl-H2O. The initial fluids evolved from high temperatures (462–498 C) and high salinities (54.5–58.4 wt% NaCl equiv) during the skarn stage into mesothermal (260–397 C) and low salinities (1.2–9.5 wt% NaCl equiv) during the sulfide stage. The oxygen and hydrogen isotopic compositions (d18OH2O: 2.7–8.8‰; dD: 82 to 120‰) suggest that the ore-forming fluids are mixture of magmatic fluids and meteoric water. Sulfur isotopic compositions of the sulfides yield d34S values of 2.3 to 3.2‰; lead isotopic compositions of ore sulfides are similar to those of granitic rocks, indicating that the sulfur and ore-metals are derived from the granitic magma. We propose that the Cangyuan Pb-Zn-Ag deposit formed from magmatic hydrothermal fluids. These Cenozoic deposits situated in the west of Lanping-Changdu Basin share many similarities with the Cangyuan in isotopic compositions, including the Laochang, Lanuoma and Jinman deposits. This reveals that the Cenozoic granites could have contributed to Pb-Zn-Cu mineralization in the Sanjiang region despite the abundance of Cenozoic Pb-Zn deposits in the region, such as the Jingding Pb-Zn deposit, that is thought to be of basin brine origin. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/8340] ![]() |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, China 2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China |
推荐引用方式 GB/T 7714 | Xian-Ze Deng;Yan Tao;Juan Li;Feng Xiong. Isotope and fluid inclusion geochemistry of the Cangyuan Pb-Zn-Ag polymetallic deposit in Yunnan, SW China[J]. Ore Geology Reviews,2017,90:928-942. |
APA | Xian-Ze Deng;Yan Tao;Juan Li;Feng Xiong.(2017).Isotope and fluid inclusion geochemistry of the Cangyuan Pb-Zn-Ag polymetallic deposit in Yunnan, SW China.Ore Geology Reviews,90,928-942. |
MLA | Xian-Ze Deng;Yan Tao;Juan Li;Feng Xiong."Isotope and fluid inclusion geochemistry of the Cangyuan Pb-Zn-Ag polymetallic deposit in Yunnan, SW China".Ore Geology Reviews 90(2017):928-942. |
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