胶东大邓格金多金属矿床地质地球化学特征及意义  

Geological and geochemical features of the Dadengge gold polymetallic deposit in Jiaodong Peninsula

作　　者：李杰[1] 宋明春 李世勇 周晓剑[4] 宋英昕 丁正江 杨立新 王珊珊 姜帆 李倩[1] 

机构地区：[1]石家庄经济学院资源学院,河北石家庄050031 [2]山东省地质矿产勘查开发局,山东济南250013 [3]山东省物化探勘查院,山东济南250013 [4]环境保护部核与辐射安全中心,北京100082 [5]山东省地质科学研究院,山东济南250013 [6]山东省第三地质矿产勘查院,山东烟台264200 [7]山东省第六地质矿产勘查院,山东威海264209

出　　处：《中国地质》2016年第1期221-237,共17页Geology in China

基　　金：石家庄经济学院博士科研基金(BQ201317);泰山学者工程专项经费;山东省地矿局科技攻关项目(KY201004;KY201305)联合资助~~

摘　　要：本文介绍了大邓格金多金属矿床地质特征,对矿床主量元素、硫同位素、氢-氧同位素及流体包裹体作了测试分析,总结了矿床地球化学特征,讨论了成矿物质来源及成矿物理化学条件。主量元素分析表明蚀变过程中Si O2、K2O含量增高,Na2O、Al2O3、Ca O等含量降低;硫同位素组成δ34SCDT值为7.0‰~7.1‰,指示硫可能来自于均一化程度较高的统一流体库;氢同位素组成δDV-SMOW变化范围较大,为-83.68‰^-116.95‰,氧同位素组成δ18O水值为-2.57‰~8.35‰,显示了成矿流体以岩浆水与大气降水组成的混合水为主;成矿流体主要为中温(86~429℃)、低盐度(1.74%~22.38%Na Cleq),属CO2-H2O-N2-Na Cl体系。成矿期流体表现出多期、多来源特征,体系物理化学条件的改变和流体的不混溶是导致金等成矿元素沉淀和富集的重要机制。In this paper, the authors described the geological features of the the Dadengge gold polymetallic deposit, analyzed major elements, REE, sulfur isotope, δDV- SMOW-δ^18OH2O, and fluid inclusions, and then summarized the geochemical features so as to find the ore- forming genesis and physicochemical conditions. Major element analyses show that the alteration zone gained Si O2, K2 O but lost Na2 O, Al2O3, Ca O during alteration. The sulfur isotope composition ranges between 7.0‰ and 7.1‰ δ^34SCDT, suggesting that the sulfurs were of the same origin, being a unified source. The δDV-SMOWvalues range from-83.68‰ to-116.95‰, and the δ^18OH2O values range from-2.57‰ to 8.35‰, suggesting that the mineralizing fluids were derived from the mixed magmatic and meteoric water. The mineralizing process took place under the condition of medium temperature（86-429℃） and low salinity（1.74%-22.38%Na Cleq）, and the mineralizing fluid might have been a CO2- H2O- N2- Na Cl system. The mineralizing fluids of the main mineralization stage exhibited feature of multiple sources, and the change of physicochemical conditions and fluid immiscibility were the important mechanisms for deposition and enrichment of gold and other mineralizing elements.

关 键 词：地球化学特征 氢氧同位素 流体包裹体 大邓格金多金属矿床 胶东 

分 类 号：P618.2[天文地球—矿床学]