【摘要】 松江Cu-W-Zn多金属矿床是我国东北地区开发较早的一个矿床,随着开采的深入已进入危机矿山阶段。结合区域地质背景、矿床特征、地球化学特征综合分析认为:松江矿床具有典型接触交代成因特征,成矿作用与花岗闪长岩体有密切关系,且花岗闪长岩形成环境具有典型岛弧或活动大陆边缘火山岩相类似的属性。花岗闪长岩、矽卡岩矿石和大理岩三者在稀土丰度、配分型式上均具有较强可比性。W、Mo等成矿元素主要来自花岗闪长岩,Pb主要来自碳酸盐围岩,而Cu、Zn则可能同时来源于二者,但Cu更趋向于后者,Zn更趋向于前者;这很好地解释了松江矿床由岩体到围岩依次出现的Mo-W矿化、Fe-Cu矿化、Cu-Pb-Zn矿化、Pb-Zn矿化的分带现象。更多还原

【Abstract】 The Songjiang Cu-W-Zn polymaetallic deposit,early discovered and exploited in Northeast China,has already become a crisis mine for lasting exploitation.Comprehensive analysis on regional geological background,deposit characteristics,and especially the associated rocks’ geochemical characteristic analysis indicate that the deposit belongs to the contact metasomatisc deposit,and the granodiorite colsely associated with the mineralization is the typical product of island arc or active continental margin tectonic setting.The chondrite-normalized REE patterns of the granodiorite,skarn and marble show a great commparability.Moreover,the W and Mo elements mainly originated from the granodiorite,and the Pb element mainly came from the carbonate.While the Cu,Zn elements might originate from both,and the Cu element tend to come from the latter more,the Zn element from the former more.These conclusions can explain the obvious mineral zonation from the granodiorite to carbonate:Mo-W,Fe-Cu,Cu-Pb-Zn and Pb-Zn in Songjiang polymetallic deposit.更多还原