江西冷水坑银铅锌矿田闪锌矿铷-锶测年及地质意义
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国家自然科学基金项目(面上项目,重点项目,重大项目)


Rb-Sr Dating of Sphalerite from the Lengshuikeng Ag-Pb-Zn Deposit, Jiangxi, and Its Geological Significances
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    摘要:

    江西冷水坑矿田是武夷山地区重要的银铅锌集中区之一。无论其世界上少有的斑岩型银铅锌矿床还是火山沉积-热液改造型矿床都独具特色,具有很高的研究价值。冷水坑矿田含矿斑岩的锆石年龄162-155Ma左右作为花岗斑岩侵入的时间,绢云母Ar-Ar年龄与含矿斑岩活动时间的一致性说明冷水坑早期成矿发生于斑岩成岩过程中。本文首次采用闪锌矿Rb-Sr同位素测年方法,获得冷水坑矿田成矿年龄为 (126.9±7.1) Ma,代表了冷水坑矿田晚期阶段叠加改造的成矿年龄。冷水坑Ag-Pb-Zn矿田中大型-超大型矿床的形成,不但受中国东部燕山期构造体制转换的制约,而且受长期多阶段矿化的影响。

    Abstract:

    The Lengshuikeng ore field in Jiangxi Province is one of the most important Ag-Pb-Zn deposits in northern Wuyi Mountains, China. It’s a typical porphyry Ag-Pb-Zn deposit in the world, as well as volcanic sedimentary-hydrothermal reworked deposit are quite unique and rare, and therefore worthy of detailed research. Mineralization age from 40Ar/39Ar age of sericite is consistent with the emplacement age of ~ 162-155Ma from the ore-bearing porphyry, indicating that the deposit formed on early stage of mineralization age. Rb-Sr dating of sphalerite yielded an isochron age of 126.9±7.1Ma, which represents the late stage of mineralization age. The Lengshuikeng deposit is not only restricted by the tectonic regime transformation of the intra-continental setting in Eastern China, but also affected on long-term and multiple stage mineralizations.

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徐贻赣,吴淦国,王长明,张达,张垚垚.2013.江西冷水坑银铅锌矿田闪锌矿铷-锶测年及地质意义[J].地质学报,87(5):621-633.
XU YIGAN, WU GANGUO, Wang Changming, ZHANG DA, Zhang Yaoyao.2013. Rb-Sr Dating of Sphalerite from the Lengshuikeng Ag-Pb-Zn Deposit, Jiangxi, and Its Geological Significances[J]. Acta Geologica Sinica,87(5):621-633.

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  • 收稿日期:2011-11-20
  • 最后修改日期:2012-12-06
  • 录用日期:2013-05-03
  • 在线发布日期: 2013-05-03
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