| 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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| 引用本文：梅玉萍,李华芹,王登红,路远发,杨红梅,许建祥,张家菁.2007.江西岩背斑岩锡矿的成岩成矿时代及其地质意义[J].地球学报,28(5):456-461. |
| DOI：10.3975/cagsb.2007.05.06 |
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| 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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| 中文摘要:岩背锡矿地处南武夷山西坡江西会昌县境内.该矿以富含原生黄玉为特征,是本区至今发现的唯一大型独立锡矿床.笔者对矿区内含锡花岗斑岩和成矿作用早阶段形成的石英-黄玉-锡石-硫化物脉进行了Rb-Sr同位素年代学研究,获得全岩和石英矿物Rb-Sr等时线年龄分别为(128.1±3.3)Ma(2σ,MSWD=1.07,Ir=0.7163±0.0052)和(125.5±6.1)Ma(2σ,MSWD=1.5,Ir=0.7130±0.0050),表明岩背锡矿的成岩成矿作用均发生于早白垩世晚期,其成因与中生代火山期后高位侵入的花岗斑岩密切相关. |
| 中文关键词:岩背斑岩锡矿 成岩成矿时代 江西 |
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| Rock-forming and Ore-forming Ages of the Yanbei Porphyry Tin Deposit in Jiangxi Province and Their Geological Significance |
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| Abstract: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. |
| keywords:Yanbei tin deposit rock-forming age and ore-forming age Jiangxi |
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