(1. 合肥工業(yè)大學(xué) 資源與環(huán)境工程學(xué)院，合肥 230009；
2. 中國(guó)冶金地質(zhì)總局 山東正元地質(zhì)勘查院，濟(jì)南 250101)
摘 要: 夏甸金礦是膠東地區(qū)典型的蝕變巖型金礦床，該礦床沿走向NNE、傾向SE的招平斷裂帶展布，控礦斷裂上盤主要為膠東群變質(zhì)巖，下盤為中粗粒二長(zhǎng)花崗巖，礦體主要產(chǎn)于斷裂帶下盤的黃鐵絹英巖中。對(duì)取自夏甸金礦井下的巖和礦石進(jìn)行了主、微量元素地球化學(xué)特征分析，夏甸金礦床巖石具有LREE及LILE富集、HREE及HFSE虧損、殼幔混合的特征，且黃鐵絹英巖Eu負(fù)異常明顯。從巖石構(gòu)造環(huán)境判別圖解可以看出，斷裂帶下盤巖體是在古元古代擠壓造山環(huán)境下或由擠壓向伸展轉(zhuǎn)化時(shí)期形成。結(jié)合文獻(xiàn)綜合對(duì)比分析可知，夏甸金礦床可能是早白堊世華北克拉通伸展背景下形成的產(chǎn)物，作為郯廬斷裂帶的次級(jí)斷裂——招平斷裂在該時(shí)期發(fā)生伸展活動(dòng)，不僅為含礦熱液的上升提供通道，而且為金礦床的形成提供有利條件。
關(guān)鍵字: 夏甸金礦；微量元素；招平斷裂；華北克拉通；殼幔混合
（1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;
2. Shandong Zhengyuan Geological Engineering Survey, China Metallurgical Geology Bureau, Jinan 250101, China）
Abstract:Xiandian gold deposit in Eastern Shandong Province is a characteristic alteration-rock type gold deposit along the Zhaoping fault zone which strike in NNE and dip in SE. The hanging wall of the ore-controlling fault is Jiaodong rock group and the footwall is medium- and coarse-grained monzogranite. Ore bodies formed mainly in the fault’s footwall containing pyrite-beresite. The major and trace elements of the rocks were investigated. The results show that they are characterized by enrichment of LREE and LILE, depletion of HREE and HFSE, curst-mantle mixing, and obvious Eu negative anomaly. The tectonic discrimination diagrams show that the batholiths in the footwall formed in the compressive orogenic background or in the stage when the compressive orogenic environment transformed into extensional environment. Based on the research data of forefathers, the Xiadian gold deposit maybe formed in the extensional environment of the North China craton in early Cretaceous. Zhaoping fault which is the secondary fault of Tan-lu fault belts was in the stretch-faulted environment during this period. It provided not only the passage of ore-bearing hydrothermal solution but also the favorable conditions of the gold deposit formation.
Key words: Xiadian gold deposit; trace element; Zhaoping fault; North China craton; curst-mantle mixing
