山东招远金矿集中区矿床及围岩中硫和铅同位素的研究  

STUDY ON THE SULFUR-LEAD ISOTOPE OF ZHAOYUAN GOLD MINERALIZATION AREA AND WALL ROCKS

作　　者：李金祥[1] 邓军[1] 吴文根[1] 王银宏[1] 程敦伍[1] 李剑[1] 

机构地区：[1]中国地质大学"岩石圈构造,深部过程及探测技术"教育部重点实验室,北京100083

出　　处：《现代地质》2004年第2期187-192,共6页Geoscience

基　　金：教育部"跨世纪人才培养计划"基金项目 ;国家自然科学基金项目 (4 0 172 0 3 6)

摘　　要：山东招远金矿集中区金矿床的围岩为新太古代胶东岩群变质岩和中生代花岗岩。胶东岩群、花岗岩及金矿床的δ3 4 S值分别为 4 7‰、 7 4‰和 8 1‰ ,3个数值均为正值 ,之间差值较小 ,且依次有规律增加 ,表现出它们具有硫的同源性和演化上的连续性。铅同位素也呈现相同的变化规律 ,N(2 0 7Pb) /N(2 0 4Pb)值在胶东岩群、花岗岩及金矿床中分别为 15 381、15 5 6 2和 15 4 75 ,与区内来自地幔的玄武岩的N(2 0 7Pb) /N(2 0 4Pb)的平均值 18 2 6 9相比差异非常明显。铅同位素中的 μ值均小于 9 5 8的临界线 ,表明铅来自同一构造环境下形成的岩石。此外 ,胶东岩群、花岗岩和金矿床The wall rocks of gold deposits located in Zhaoyuan gold mineralization area were rooted in metamorphic rocks in Jiaodong rock group in Archaean era and granites in Mesozoic era. The average values of δ ()^(34)S in Jiaodong rock group, granites and gold deposits are 7.4 ‰, 6.9 ‰ and 8.1 ‰ respectively. Three positive values increase successively, so they have sulfur homologue and continuity in evolvement. Lead isotope is similar to sulfur isotope, the average values of()^(207)Pb/()^(204)Pb in Jiaodong rock group, granites and gold deposits are 15.381, 15.562 and 15.475 respectively, and it is very clear that their values are all less than the average value of basalt rooted in mantle 18.269. The μ values in lead isotope are all less than their critical value 9.58, so it is indicated that lead was rooted in rocks formed at the same structural settings. In addition, it is also indicated by contact relations among them that Jiaodong rock group, granites and gold deposits are the evolutive results at the different geological stages with the same mineral source rock.

关 键 词：金矿床 硫同位素 铅同位素 招远 山东 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]