安徽省池州市马头斑岩型铜钼矿床特征、成因和找矿方向  

Characteristics,origin and future prospecting of porphyry copper-molybdenum deposit at Matou of Chizhou City,Anhui Province,China

作　　者：赵超[1,2] 谢兴楠[1,2] 柳建新[1] 顾连兴[2,3] 胡建[2] 肖娥[2] 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]江苏省有色金属华东地质勘查局,南京210007 [3]南京大学地球科学与工稗学院,南京210008

出　　处：《中国有色金属学报》2013年第12期3503-3517,共15页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(41174103,41102036);国家博士点基金资助项目(20110162130008);国家“十二五”科技支撑计划项目(2011BAB04B08);中国地质调查局科研项目(资[2011]03-01-64)

摘　　要：安徽省池州市马头铜钼矿区燕山期花岗闪长斑岩在距地表400 m以下,被众多细粒钾长花岗岩脉穿插,其热液蚀变-矿化从上往下可分为上部石英-绢云母化带、中部线型钾长石化带以及下部面型钾长石化带。典型的细脉-浸染状铜钼矿化主要发育于面型钾长石化带中,但钾长花岗岩中也常见铜钼硫化物的细脉和浸染。花岗闪长斑岩中石英脉流体包裹体均一温度为101.4～437.8℃,并集中于150～300℃;盐度(NaCl equiv,质量分数)多数为0～12%。辉钼矿和黄铁矿δ34S变化范围为1.2×10-3～9×10-3,平均值为4.5×10-3。辉钼矿的δ34S略大于黄铁矿的,表示成矿流体已经达到了同位素平衡。作为一个斑岩型矿床,马头矿区花岗闪长岩体下方可能存在一个较大的钾长花岗岩体,为该铜钼矿床的形成提供了金属物源及成矿流体,而花岗闪长斑岩主要起了容矿围岩的作用。The Yanshanian granodiorite porphyry of the copper-molybdenum ore district at Matou of Chizhou City in Anhui Province is inserted by numerous fine-grained moyite dikes at depths more than 400 m below surface. Hydrothermal alteration and mineralization of the granodiorite porphyry,the major ore-host,can be divided into three zones： the upper quartz-sericitization zone,the middle linear K-feldspar zone,and the lower K-feldsparization zone. Ores of the veinlets-disseminations-type occur typically in this zone,although veinlets and disseminations of copper and molybdenum sulfides can also be found in moyite dikes. Homogenization temperatures of fluid inclusions in quartz veins in the granodiorite porphyry range from 101.4 to 437.8 ℃,with a majority being 150-300 ℃. Most of the salinity（NaCl equiv,mass fraction） determinations distributed in the range of 0-12%（mass fraction）. δ34S of molybdenite and pyrite vary in the range between 1.2×10-3 and 9×10-3,with an average of 4.5×10-3. Slightly higher δ34S values of molybdenite than those of pyrite indicate isotope equilibrium in the ore-forming fluids. As the source of the moyite dikes,a bigger moyite intrusion is suggested to occur below the granodiorite body in the deposit area. The deposit is of the porphyry type with metals and fluids came essentially from the moyite,whereas the granodiorite can only be regarded as a host rock.

关 键 词：铜钼矿石 胶辉钼矿 斑岩型铜钼矿 江南深断裂 马头 池州 

分 类 号：P588.121[天文地球—岩石学] P611.1[天文地球—地质学]