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有色金属(矿山部分):2019,71(6):32-36
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云南都龙锡锌多金属矿床硫铅同位素地球化学示踪
(1. 有色金属成矿预测与地质环境监测教育部重点实验室(中南大学),长沙 410083;2. 有色资源与地质灾害探查湖南省重点实验室,长沙 410083;3. 中南大学地球科学与信息物理学院,长沙 410083))
Sulfur and lead isotope geochemistry of the DulongSn-Zn polymetallicore deposit, Yunnan province, China
(1.(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;2.Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha 410083, China;3.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China))
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中文摘要: 深入探索云南都龙锡锌多金属矿床的成矿物质来源,解析矿床形成的构造环境与深部地球动力学背景,有助于揭示矿床的成矿作用机制及其形成机理。通过开展矿石硫铅同位素组成及其地球化学特征研究,结果表明,硫同位素δ34SCDT值介于-1.27‰~2.92‰,以正值为主,极差为4.19‰,均值为0.87‰;206Pb/204Pb为17.573~18.574,极差为1.001,均值为18.267;207Pb/204Pb为15.526~15.746,极差为0.22,均值为15.677;208Pb/204Pb为38.077~39.158,极差为1.081,均值为38.81;ω值介于38.87~41.09之间;μ值范围为9.43~9.74;Th/U为3.91~4.13。都龙矿床的硫源主要表现为岩浆硫的特点,而矿床的铅源具有多来源特征,主要来自于下地壳,另外造山带铅也具有一定贡献;矿床主体形成于下地壳构造环境。
Abstract:Exploring the ore-forming material sources of the Dulong Sn-Zn polymetallic deposit, Yunnan province, and analyzing the tectonic environment and deep geodynamic background, can help reveal the metallogenic mechanism and its formation mechanism of the ore deposit. Based on the study of sulfur-lead isotope composition and their geochemical characteristics, resultsindicatedthe δ34SCDT values of sulfur isotopevaried from -1.27‰ to 2.92‰, mainly positive values, with the maximum range of 4.19‰ and the average value of 0.87‰. The ratios of 206Pb/204Pb ranged from 17.573 to 18.574, with the maximum range of1.001 and the average value of 18.267. The ratios of 207Pb/204Pb ranged from15.526 to 15.746, with the maximum range of 0.22 and the average value of 15.677.The ratios of 208Pb/204Pb ranged from 38.077 to 39.158,with the maximum range of 1.081 and the average value of 38.81. The values of ω, μ and Th/U ranged from 38.87 to 41.09, 9.43 to 9.74, and 3.91 to 4.13, respectively. The sulfur source of the Dulong deposit was mainly characterized by the magma sulfur, yet the lead sources are multi-origin, which mainly originated from the lower crust; in addition, the orogenic belt lead also had a little contribution. The Dulong Sn-Zn ore deposit was mainly formed in the lower crustal tectonic environment.
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基金项目:国家自然科学基金资助项目(41672076)
引用文本:
成永生1, 2, 3,孙午萌1, 2, 3.云南都龙锡锌多金属矿床硫铅同位素地球化学示踪[J].有色金属(矿山部分),2019,71(6):32-36.
CHENG Yongsheng1, 2, 3,SUN Wumeng1, 2, 3.Sulfur and lead isotope geochemistry of the DulongSn-Zn polymetallicore deposit, Yunnan province, China[J].NONFERROUS METALS(Mining Section),2019,71(6):32-36.

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