大庄子金矿床稳定同位素地球化学研究  

STUDY ON STABLE ISOTOPE GEOCHEMISTRY AND GENESIS OF DAZHUANGZI GOLD DEPOSIT

作　　者：连国建[1] 

机构地区：[1]中国冶金地质勘查工程总局山东局三队,山东烟台264002

出　　处：《地质找矿论丛》2003年第z1期126-131,140,共7页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金项目(49973001)资助

摘　　要：大庄子金矿为新近发现的大型金矿床,矿床产于胶北地体与胶莱断陷盆地拼合带附近的荆山群地层中,同时产出石英脉和蚀变岩两种类型的矿体。矿物组合中含有非常丰富的方铅矿、闪锌矿和黄铜矿。同位素研究表明,成矿物质具多源性特点,既有深部来源,又与荆山群地层有一定关系。成矿流体δ(^(18)O_(H_2O))=+5.30×10^(-3)～+2.31×10^(-3)),δ(D_(H_2O))=-66.4×10^(-3)～-72×10^(-3),反映了成矿流体由大气降水和岩浆水混合组成的特点,成矿时代为115Ma。Dazhuangzi Au deposit is a large one recently found in the southwestern margin of Jiaobei Precambrian terrain. It shows different characteristics from the other gold deposits in the middle and north of the terrain. Dazhuangzi gold deposit occurs in Early Proterozoic Jingshan group near the amalgamation zone of Jiaobei terrain and Jiaolai fault basin. Two types of ore bodies, quartz-vain type and altered-rock type, are found in this gold deposit. According to the data from hydrogen and oxygen isotopic compositions(δ(^(18)O_(H_2o))=+5.30×10^(-3)～+2.31×10^(-3),δ(D_(H_2o))=-66.4×10^(-3)～-72×10^(-3)), the conclusion can be reached that the mineralizing fluid of Dazhuangzi gold deposite was a kind of mixed hydrothermal solution which was mainly composed of meteoric water and magmatic water. The minerogenetie epoch of 115 Ma is proposed.

关 键 词：大庄子金矿 稳定同位素地质地球化学 成因探讨 山东省 

分 类 号：P597.2[天文地球—地球化学] P618.51[天文地球—地质学]