新城金矿稳定同位素地球化学特征及成矿物质来源探讨  

Geochemical Characteristics of Stable Isotopes and Metallogenic Material Source in the Xincheng Gold Deposit

作　　者：姜盛洪 王长明[1] 赵海[2] 贺昕宇[1] 夏锐[1] 郭春影[3] 赖相濡 欧阳学财 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]山东黄金集团有限公司,山东济南250000 [3]核工业北京地质研究院,北京100029

出　　处：《地质与勘探》2015年第1期68-78,共11页Geology and Exploration

摘　　要：新城金矿是胶东金矿集区招远—莱州成矿带的一个"焦家式"蚀变型金矿床。本文主要通过C、H、O、S、Pb同位素研究,对新城金矿成矿流体、物质来源和成矿作用进行探讨和研究。新城金矿矿石中δD值范围为-116‰^-91‰,δ18O水值范围为3.8‰~7.2‰,表明成矿流体早期来源于岩浆水,成矿晚期混入大气降水。矿石硫化物、郭家岭花岗闪长岩、玲珑花岗岩和胶东群δ34S平均值分为7.9‰、6.5‰、8.5‰和6.2‰,认为矿石硫具有对矿区地层及岩浆岩硫的继承性。硫化物矿石206Pb/204Pb=17.115~17.414,207Pb/204Pb=15.460~15.577,208Pb/204Pb=37.912~38.196,显示铅具有壳幔混合来源的特征。碳、氢、氧、硫、铅同位素反映新城金矿成矿物质和流体主要来源于深部岩浆。The Xincheng gold deposit,located in the Zhaoyuan-Laizhou gold metallogenic belt,is one of the'Jiaojia'altered rock type gold deposit.This paper aims at revealing ore-forming fluids source,metal source and metallogenesis by C,H,O,S and Pb isotopes. The δDvalues of fluid inclusion in quartz are-116‰ ^-91‰,and δOwatervalues are 3. 8‰ ~ 7. 2‰,which suggest the ore-forming fluids were derived mainly magmatic water in the early period,with addition of minor amounts of meteoric water in the later period. The δ34S average value of the pyrites in the ores,Guojialing granodiorite,Linglong granite and Jiaodong Group,are 7. 9‰,6. 5‰,8. 5‰,and 6. 2‰,respectively,indicating their contribution from strata and granitoids. The ratios206 Pb /204 Pb,207Pb /204 Pb and208Pb /204 Pb are 17. 115 ~ 17. 414,15. 460 ~ 15. 577 and 37. 912 ~ 38. 196,respectively,indicating that Pb isotope is from crustal-mantle mixing. The C-H-O-S-Pb isotope values in the ores demonstrate that the ore-forming fluids and metal were derived mainly from magmatic sources.

关 键 词：同位素 流体来源 物质来源 成矿作用 新城金矿 

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