| 云南会泽铅锌矿床粘土矿物K-Ar测年及其地质意义 |
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| 引用本文：.2005.K-Ar dating of altered clay minerals from Huize Pb-Zn deposit in Yunnan Province and its geological significance[J].Mineral Deposits,24(3):317~324 |
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| 基金项目:中国地质调查局地质调查项目（200310200002）和国家重点基础研究发展规划项目(G1999043211) |
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| 中文摘要:文章应用K_Ar法测得会泽铅锌矿床矿体中的蚀变粘土矿物年龄为（176.5±2.5） Ma，该年龄为成矿作用第一阶段黄铁矿形成的年龄，略早于第二阶段方铅矿、闪锌矿和方解石的形成年龄。该年龄表明这些铅锌矿床的形成与峨眉山玄武岩浆活动(251～262 Ma)有明显的时间间隔，而可能为特提斯板块向大陆俯冲期间在大陆边缘岩浆弧后伸展带形成的MVT矿床。 |
| 中文关键词:地球化学 K_Ar年龄 粘土矿物 成矿作用 会泽铅锌矿 云南 |
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| K-Ar dating of altered clay minerals from Huize Pb-Zn deposit in Yunnan Province and its geological significance |
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| Abstract:The large_size Huize Pb_Zn deposit is a typical ore deposit in the Sichuan_Yunnan_Guizhou Pb_Zn ore district. Accurate metallogenic ages of the deposits in this district were not determined in the past. In this paper, the age of （176.5±2.5） Ma is obtained by K_Ar dating of altered clay minerals, which is the same as the age of the first_stage pyrite and is a bit older than the age of sphalerite, galena and calcite which were formed at the second stage. The data indicate that the ore_forming event of the Pb_Zn deposits is obviously later than the activity of Emeishan basalt (251～262 Ma). The deposit is likely to be of MVT which was formed in the extension belt of the landmass margin back_arc magma when Tethyan block subducted to the landmass. |
| keywords:geochemistry, K_Ar dating, clay mineral, ore_forming process, Huize Pb_Zn deposit, Yunnan |
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