中文摘要:江西银山矿床是一个与火山_次火山热液有关的多金属矿床。文章通过对该矿床九区与铜金矿化有关的蚀变英安斑岩和石英斑岩中绢云母的40Ar_39Ar快中子活化年龄测试，获得蚀变英安斑岩中绢云母的坪年龄和等时线年龄分别为（178.2±1.4） Ma和（179.6±2.9） Ma；蚀变石英斑岩中2件绢云母样品的坪年龄和等时线年龄分别为（175.4±1.2） Ma和（175.3±1.1 Ma），（176.2±5.1） Ma和（176.6±3.3） Ma。这些数据表明，银山多金属矿床铜金矿化的成矿时代为175～180 Ma。该成果的获得对于进一步认识德兴地区乃至华南地区中生代的地球动力学背景具重要意义。
Abstract:The Yinshan polymetallic deposit in Jiangxi Province is a hydrothermal vein_type deposit closely related to Late Jurassic felsic_intermediate volcanic_subvolcanic activities. The second stage of Cu_Au mineralization is associated with dacite porphyry. Sericites from dacite porphyry and quartz porphyry in the Cu_Au ore zone were analyzed by the 40Ar-39Ar fast_neutron activation dating technique, and the results yielded the plateau age and the isochron age of (178.2±1.4) Ma and (179.6±2.9) Ma respectively in altered dacite porphyry, and (175.4±1.2) Ma and (176.2±5.1) Ma, (175.3±1.1) Ma and (176.6±3.3) Ma respectively in altered quartz porphyry. It is held that the Cu_Au mineralization in the Yinshan deposit took place in 175～180 Ma, resulting from the tectonic extension related to multiple lithospheric extension in South China.
文章编号：
中图分类号：
文献标志码：
基金项目:国家自然科学基金青年项目（40403006）、国家自然科学基金重点项目（40434011）和中国博士后资助金（2003033209）
引用文本：
李晓峰，陈 文，毛景文，王春增，谢桂青，冯佐海.2006.江西银山多金属矿床蚀变绢云母40Ar-39Ar年龄及其地质意义[J].矿床地质,25(1):17~26李晓峰，陈 文，毛景文，王春增，谢桂青，冯佐海.2006.40Ar/39Ar dating of sericite from altered dacite porphyry and quartz porphyry in Yinshan polymetallic deposit of Jiangxi Province and its geological significance[J].Mineral Deposits25(1):17~26
图/表
