胶东邓格庄金矿床流体包裹体氦、氩同位素组成及其成矿物质来源示踪  

Helium and Argon Isotopic Composition in Fluid Inclusions and the Source of Ore-Forming Materials of Denggezhuang Gold Deposit in Jiaodong Peninsula

作　　者：薛建玲[1,2] 李胜荣[1] 孙文燕[1] 张运强[1] 张旭[1] 刘春岚 

机构地区：[1]地质过程与矿产资源国家重点实验室/中国地质大学地球科学与资源学院,北京100083 [2]中国地质调查局发展研究中心,北京100037 [3]烟台市牟平金矿,山东烟台264109

出　　处：《吉林大学学报（地球科学版）》2013年第2期400-414,共15页Journal of Jilin University：Earth Science Edition

基　　金：全国危机矿山接替资源找矿项目(20089937);国家自然科学基金重大研究计划重点支持项目(90914002);中国地质调查局计划项目(1212011220926);高等学校学科创新引智计划资助项目(B07011)

摘　　要：矿床成因和成矿物质来源一直是成矿理论研究和实际找矿中争论的焦点。选择了邓格庄金矿床5件不同成矿阶段的矿石样品,对黄铁矿流体包裹体氦、氩同位素进行了测试。研究结果表明:R/Ra值为0.008 33～3.612 00,平均为1.400 00;40 Ar/36 Ar值为465.7～4 674.7;4 He/40 Ar*值为0.36～1.36,成矿流体中地幔端元流体的比例为3.73%～45.87%,平均为17.67%。结合氢氧同位素、岩浆岩、围岩蚀变和流体包裹体等证据,反映了成矿流体具地壳流体和地幔流体混合特征,主要来源于地壳,并有明显地幔流体混入,上升过程中可能还有少量大气降水的参与。Ore genesis and source of ore forming materials are always be debated in the study of the metallogenic theory and ore prospecting. In the paper, helium and argon isotopic characteristics of the pyrite from five gold ore samples formed in different stages are analyzed. It is showed that the R/Ra ratio in the fluid ranges from 0. 008 33 to 3. 612 00, with an average of 1. 400 00; the ~~Ar/36Ar ratio ranges from 465.7 to 4 674.7, the ratio of 4He/4~Ar~ varies from 0.36 to 1.36. The ratio of the mantle fluid in ore-forming fluid is from 3. 73~ to 45. 87~,average value is 17. 67~. Combined with the characteristics of H - O isotope, magmatic rock, wall rock alteration and fluid inclusion etc. , it is suggested that ore-forming fluid belongs to the mixture of mantle-derived and crustal-derived fluid. It is mainly derived from the crust, and mixed by the mantle-derived fluid and the small amount of meteoric water in the metallogenic process.

关 键 词：邓格庄 氦、氩同位素 流体包裹体 地壳流体 地幔流体 金矿 

分 类 号：P618.51[天文地球—矿床学]