乌奴格吐山斑岩铜钼矿床中金属矿物的特征  

Characteristics of Metallic Minerals from the WunugetushanPorphyry Copper Molybdenum Deposit

作　　者：陈殿芬[1] 艾永德[1] 李荫清[1] 

机构地区：[1]中国地质科学院矿床地质研究所

出　　处：《岩石矿物学杂志》1996年第4期346-354,共9页Acta Petrologica et Mineralogica

摘　　要：乌奴格吐山矿床是一个大型斑岩铜钼矿床。金属矿物中以贯通性矿物黄铁矿含量最多。钼、铜、铅锌三个主要成矿阶段，黄铁矿的平均温度分别为３３１℃、２２８℃、＜２００℃。黄铁矿中Ｃｏ、Ｎｉ、Ａｓ等微量元素特征为成矿物质来源提供了重要信息。辉钼矿是唯一重要的钼矿物，主要赋存在石英－钾长石化带，以２Ｈ型为主。铜矿物有黄铜矿、锌砷黝铜矿、斑铜矿等，以黄铜矿为主，主要赋存在石英－绢云母－水白云母化带。不同世代黄铜矿微量元素的差异反映了成矿溶液的变化。方铅矿、闪锌矿主要赋存于石英－伊利石－水白云母化带。闪锌矿贫铁（ＸＦｅＳ＝４ｍｏｌ％—８ｍｏｌ％），方铅矿含Ａｇ（０．０１％—０．３５％）。The Wunugetushan deposit is a large sized porphyry copper molybdenum deposit with pyrite as the most abundant metallic mineral. The average decrepitation temperatures of pyrite for three major ore forming stages (molybdenum, copper, lead zinc) are 331℃, 228℃ and <200℃, which on the whole represent main ore forming temperatures of three major mineralization stages. Pyrite is characterized by low Co (64.84×10 -6 ) and Ni (15.6×10 -6 ) but very high As (588.6×10 -6 ),diametrically different from pyrite in porphyry copper molybdenum deposits of China whereas similar to pyrite of sedimentary or stratabound origin in features of trace elements. This suggests to certain extent that some ore forming substances of the ore deposit had nothing to do with mentle materials. Molybdenite, the only important molybdenum mineral, is dominantly of 2H type and occurs mainly in the quartz potash feldspathization zone. Different from most porphyry copper molybdenum deposits in China, this ore deposit contains very low Re, implying not only high differentiation degree of the rock body but also the derivation of Mo from biotite granite of upper crust remelting origin. Copper minerals are mainly chalcopyrite and subordinately Zn tennantite and bornite, which mainly occur in the quartz sericite hydromus covitization zone. The differences in trace elements of chalcopyrite of different generations reflect variation in ore forming solutions. Galena and sphalerite mainly occur in the quartz illite hydromuscovite zone, with sphalerite deficient in iron (X FeS =4 mol% 8 mol%),and galena containing Ag(0.01% 0.35%).

关 键 词：铜矿床 钼矿床 斑岩型 金属矿物 

分 类 号：P618.410.4[天文地球—矿床学] P618.650.4[天文地球—地质学]