CAJ | 학술논문

夏甸金矿是胶东地区典型的蚀变岩型金矿床，该矿床沿走向NNE、倾向SE的招平断裂带展布，控矿断裂上盘主要为胶东群变质岩，下盘为中粗粒二长花岗岩，矿体主要产于断裂带下盘的黄铁绢英岩中。对取自夏甸金矿井下的岩和矿石进行了主、微量元素地球化学特征分析，夏甸金矿床岩石具有 LREE 及 LILE 富集、HREE及HFSE亏损、壳幔混合的特征，且黄铁绢英岩Eu负异常明显。从岩石构造环境判别图解可以看出，断裂带下盘岩体是在古元古代挤压造山环境下或由挤压向伸展转化时期形成。结合文献综合对比分析可知，夏甸金矿床可能是早白垩世华北克拉通伸展背景下形成的产物，作为郯庐断裂带的次级断裂——招平断裂在该时期发生伸展活动，不仅为含矿热液的上升提供通道，而且为金矿床的形成提供有利条件。
하전금광시효동지구전형적식변암형금광상，해광상연주향NNE、경향SE적초평단렬대전포，공광단렬상반주요위효동군변질암，하반위중조립이장화강암，광체주요산우단렬대하반적황철견영암중。대취자하전금광정하적암화광석진행료주、미량원소지구화학특정분석，하전금광상암석구유 LREE 급 LILE 부집、HREE급HFSE우손、각만혼합적특정，차황철견영암Eu부이상명현。종암석구조배경판별도해가이간출，단렬대하반암체시재고원고대제압조산배경하혹유제압향신전전화시기형성。결합문헌종합대비분석가지，하전금광상가능시조백성세화북극랍통신전배경하형성적산물，작위담려단렬대적차급단렬——초평단렬재해시기발생신전활동，불부위함광열액적상승제공통도，이차위금광상적형성제공유리조건。
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.