| 江西岩背斑岩锡矿的成岩成矿时代及其地质意义 |
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| 关键词:Yanbei tin deposit rock-forming age and ore-forming age Jiangxi |
| 基金项目:国家科技支撑计划“南岭地区有色—贵金属成矿潜力及综合探测技术示范研究”(编号:2006BAB01A01); 中国地质调查局《全国重要矿产和区域成矿规律研究》(编号:1212010633903); 国家重点基础研究发展规划项目(编号:G1999043201) |
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| 摘要: |
| Rock-forming and Ore-forming Ages of the Yanbei Porphyry Tin Deposit in Jiangxi Province and Their Geological Significance |
| Located in western Wuyi Mountain within Huichang County of Jiangxi Province,the Yanbei tin deposit with rich original topaz is the only large-sized tin deposit so far discovered in the study area.Isotopic chronological study of the tin-bearing granite-porphyry and quartz-topaz-cassiterite veins formed at the early ore-forming stage shows that the quartz-topaz-cassiterite veins have a quartz fluid-inclusion Rb-Sr isochron age of(125.5±6.1) Ma(2σ,MSWD=1.5,Ir=0.7130±0.0050),which accords with the whole-rock Rb-Sr isochron age((128.1±3.3) Ma,2σ,MSWD=1.07,Ir=0.7163±0.0052) of the granite-porphyry.It is thus concluded that the rock-forming and ore-forming activities of the Yanbei tin deposit occurred during the early Cretaceous episode,with the mineralization closely related to the post-volcanic high-level emplaced granite-porphyry. |
| MEI Yu-ping,LI Hua-qin,WANG Deng-hong,LU Yuan-fa,YANG Hong-mei,XU Jian-xiang,ZHANG Jia-jing.2007.Rock-forming and Ore-forming Ages of the Yanbei Porphyry Tin Deposit in Jiangxi Province and Their Geological Significance[J].Acta Geoscientica Sinica,28(5):456-461. |
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