胶东蓬莱河西金矿床铅、硫同位素地球化学特征  

Lead and Sulfur Isotope Geochemistry of the Hexi Gold Deposit in Penglai,Eastern Shandong

作　　者：侯明兰[1] 丁昕[1] 蒋少涌[1] 

机构地区：[1]南京大学地球科学系成矿作用国家重点实验室

出　　处：《地球学报》2004年第2期145-150,共6页Acta Geoscientica Sinica

摘　　要：蓬莱河西金矿位于胶东三大金矿带中的栖蓬金矿带内 ,金矿体受NE向断裂构造控制 ,赋存围岩既有花岗岩也有胶东群变质岩 ,特别是郭家岭花岗闪长岩的内外接触带 ,金矿化更为富集。矿石以含金石英脉型为主。对该矿床S同位素研究表明 ,δ3 4 S值为 7.4‰～ 8.5‰ ,平均值为 7.8‰。矿石Pb同位素组成2 0 6Pb/ 2 0 4Pb为 17.30 86～ 17.4 799,2 0 7Pb/ 2 0 4Pb为15 .5 2 6 4～ 15 .5 6 92 ,2 0 8Pb/ 2 0 4Pb为 38.0 973～ 38.36 98;与矿区出露的煌斑岩脉的铅同位素组成十分相近 ,而与赋矿围岩郭家岭花岗闪长岩的铅同位素组成不同。研究表明 ,该矿床的成矿物质可能部分来自幔源 ,具有与玲珑、焦家等超大型金矿类似的特征。The Hexi gold deposit is located in the Qi-Peng gold zone,one of the three major gold mineralization zones in Jiaodong(eastern Shandong). This deposit occurs mainly in the Goujianling granite body,with a part in the Precambrian metamorphic rocks. The ores are mainly of the auriferous quartz vein type hosted in NE-trending fractures and faults. Sulfur isotope analyses show that δ 34 S values of pyrites vary in the range of 7.4‰～8.5‰,with an average of 7.8‰. Pb isotope analyses reveal that 206 Pb/ 204 Pb , 207 Pb/ 204 Pb and 208 Pb/ 204 Pb ratios of the ore lead are 17.3086～17.4799,15.5264～15.5692,and 38.0973～38.3698,respectively,which are quite similar to the Pb isotope data of lamprophyres in the region,but are significantly different from the data of granites. The research results suggest that the Hexi gold deposit might have partly derived its ore-forming materials from the mantle,and that it shares similar geochemical characteristics with the giant Linglong and Jiaojia gold deposits.

关 键 词：金矿床 硫同位素 铅同位素 同位素地球化学 蓬莱河 

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