【摘要】：濱南鉬礦位于大興安嶺成礦帶,為近年來(lái)發(fā)現(xiàn)的燕山期中型斑巖型鉬礦床。為探討礦區(qū)賦礦巖體的成因,巖體構(gòu)造環(huán)境及成巖成礦關(guān)系,對(duì)賦礦圍巖花崗巖進(jìn)行了巖石地球化學(xué)分析。該花崗巖的鋯石U-Pb年齡為155 Ma±1.5 Ma,表明該花崗巖的侵位年齡為晚侏羅世。在地球化學(xué)組成上,該花崗巖具有高w(SiO_2)(70.79%~73.35%)、高w(K_2O)(3.23%~4.79%)、低w(P_2O_5)(0.08%~0.11%)、低w(TiO_2)(0.24%~0.30%)的特征,TFeO/MgO比值介于4.98~8.80,分異指數(shù)(DI)介于81.98~86.64均較高,經(jīng)歷了高度的結(jié)晶分異,屬高分異的I型花崗巖�；◢弾r的稀土元素總量較低(ΣREE=94.63×10~(-6)~124.94×10~(-6)),輕重稀土分異程度極高[(La/Yb)N=19.88~26.01],并具有中等—弱的負(fù)銪異常(δEu=0.69~0.87);具有大離子親石元素(K,Ba,Rb)富集和高場(chǎng)強(qiáng)元素(Nb,Ta,Ti)虧損的特征,表明賦礦花崗巖具有島弧花崗巖的特征。成礦與成巖在時(shí)間、空間及成分上的一致性,指示成巖與成礦產(chǎn)生于同一地質(zhì)事件,即形成于中生代蒙古-鄂霍次克洋向東北板塊俯沖的構(gòu)造環(huán)境。
[Abstract]:Binnan Mo deposit is located in the Daxinganling metallogenic belt and is a Yanshanian medium-sized porphyry Mo deposit discovered in recent years. In order to discuss the genesis, tectonic environment and diagenetic and metallogenic relationship of ore-bearing rock mass in mining area, the petrogeochemistry analysis of granites in ore-bearing surrounding rock is carried out. The zircon U-Pb age of the granite is 155 Ma 鹵1.5 Ma, indicating that the emplacement age of the granite is late Jurassic. In terms of geochemical composition, the granite has the characteristics of high (SiO_2) (70.79% 鈮，

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