江西大吉山钨矿成矿年代学研究  

K-Ar AGES OF PLUTONISM AND MINERALIZATION AT THE DAJISHAN TUNGSTEN DEPOSIT, JIANGXI PROVINCE, CHINA

作　　者：蒋国豪[1] 胡瑞忠[1] 谢桂青[1] 赵军红[1] 唐群力[1] 

机构地区：[1]中国科学院地球化学研究所矿床重点实验室

出　　处：《矿物学报》2004年第3期253-256,共4页Acta Mineralogica Sinica

基　　金：国家杰出青年基金(49925309)

摘　　要：大吉山钨矿床是一个大型的石英脉型钨矿床。矿床在空间上与燕山早期复式花岗岩相伴。利用云母单矿物的K Ar同位素年龄测试方法,测定了矿床有关的花岗岩及矿脉的同位素年龄。结果表明,黑云母花岗岩中黑云母K Ar年龄为(160 3±3 03)Ma和(164 2±3 5)Ma,二云母花岗岩中白云母K Ar年龄为(160 6±2 8)Ma,含钨石英脉中白云母K Ar年龄为(152 6±2 35)Ma和(158 1±2 8)Ma。钨成矿与花岗岩的成岩基本不存在时差,推测含钨石英脉的形成可能与岩浆分异出的富含矿化剂和成矿元素的流体有关。The Dajishan tungsten deposit is a superlarge tungsten deposit. Mineralization of the Dajishan deposit has long been suggested to be related, both spatiallyand temporally, to the Dajishan complex granite. The complex granite consists of three rock types, i.e.,medium-megograined porphyroid biotite granite (167Ma, Rb-Sr; 164Ma, K-Ar), medium-grained two-mica granite (161Ma, Rb-Sr; 160Ma, K-Ar) and fine-grained muscovite granite (159Ma, Rb-Sr). The K-Ar ages of hydrothermal vein mineralization are 152Ma and 158Ma,probably related to the medium-grained two-mica granite. So the K-Ar age of the hydrothermal vein mineralization is 155Ma and is probably related to the complex granite.A conclusion may bedrawn thatthe deposit seems to have beenformed by fractional mineralization of liquid from the magma.

关 键 词：钨矿 成矿年代学 花岗岩体 同位素测年 热液脉矿化 

分 类 号：P597[天文地球—地球化学] P618.67[天文地球—地质学]