【摘要】 冬瓜山矿区是铜陵矿集区的一个重要组成部分.前人对铜陵地区岩浆岩做了大量研究,但对冬瓜山矿区闪长质岩浆岩则缺乏专题性研究.基于前人在铜陵地区所做研究,从区内岩体地质特征着手,结合岩相学及相关岩石地球化学研究,表明区内石英闪长岩及闪长玢岩均属高钾钙碱性系列高分异闪长岩类,闪长玢岩明显比石英闪长岩更加亏损稀土元素.两类岩石均为轻稀土富集型,但其分布模式又稍显不同,石英闪长岩岩体的结晶分异程度明显低于闪长玢岩体的结晶分异度.闪长质岩浆岩形成时以幔源物质为主,并有少量地壳组分参与.但石英闪长岩与闪长玢岩源区性质不同.区内与成矿密切相关的闪长岩中成矿元素Cu等元素都表现出明显的富集性,而闪长玢岩则与成矿基本无关.更多还原

【Abstract】 Dongguashan mine is one of the most important part of the Tongling deposit-intensive area. A lot of studies have been made on the magmatic rocks in the Tongling area; however,we lack monographic study on dioritic rock in the Dongguashan Mine. The study based on the previous studies of Tongling area,combining with previous research results of the geological feature of Dongguashan mine rock body and the related petrologic and petrochemical has shown that quartz diorite and diorite porphyrite in the area all belong to High-K calc-alkaline series,highly fractionated granodiorite; diorite porphyrite deplate significantly more in REE than quartz diorite. Both two group rocks exhibit a LREE enrichment,however,their REE distribution pattern can be slightly different. The stallization & differentiation of quartz diorite body have a lower degree than that of diorite porphyrite. Diorite rock is mainly formed from mantle material,and has a small amount of crustal component. However,the properties of these two magma sources are different. Ore-forming elements,such as Cu,in the dioritic rock closely related with the regional metamorphism,are highly accumulated,by contrast,dioritic rock has nothing to do with mineralization of this area.更多还原