云南普朗超大型斑岩铜矿特征及成矿模型  

Characteristics and metallogenic model of the Pulang superlarge porphyry copper deposit in Yunnan,China

作　　者：李文昌[1] 曾普胜[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]云南财经大学资源环境系,昆明650021

出　　处：《成都理工大学学报（自然科学版）》2007年第4期436-446,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金资助项目(40272046);中国地质调查局资助项目(200110200009);国土资源大调查项目(20021020001)

摘　　要：普朗斑岩铜矿床位于义敦岛弧带南端,是中国目前可以确定的印支期斑岩铜矿床的典型代表。矿床产于由石英闪长玢岩、石英二长斑岩小岩株组成的复式岩体中,通过野外观察和典型地质体的辉钼矿Re-Os年龄、黑云母Ar/Ar年龄和K-Ar年龄测定,确定成矿年龄为(213±3.8)^(216.0±1)Ma,为晚三叠世诺利期,表明普朗斑岩铜矿床的成矿作用在印支期完成。含矿岩体蚀变分带明显,由中心向外发育强硅化带(局部)→钾长石、黑云母化带→石英、绢云母化带→青磐岩化带(局部发育伊利石-碳酸岩化带)。工业矿体主要产于石英二长斑岩中的钾长石、黑云母化带和石英、绢云母化带。矿床具有斑岩铜矿中下部细粒状浸染、中上部细网脉状浸染和顶部围岩中产出大脉状矿体的"三层楼"模式。其斑岩体、元素组合及矿化特征与蒙古的欧玉.陶勒盖斑岩铜矿可以对比,资源潜力巨大。The westward subduction of the Ganze-Litang Paleo-ocean occurred earliest in the late Early Triassic, and up to the Late Triassic, the plate of the Ganze-Litang Paleo-ocean subducted in a largescale beneath the Zhongza massif to lead to the formation of the Yidun island arc belt （YIAB）. The Pulang porphyry copper deposit is just located at the southern end of YIAB, and is regarded as the typical Triassic porphyry copper deposit in China up to now. The deposit is hosted in a composite intrusion in the form of a stock consisting of quartz diorite porphyry and quartz monzonite porphyry. The host intrusion is quartz monzonite porphyry occupying an area of 1.09 km^2. By Re-Os dating for molybdenite and K/Ar, Ar/Ar dating for thermal minerals, such as biotite and orthoclase, and whole rock from the Pulang porphyry copper deposit, the mineralization period of the porphyry copper deposit is determined for the first time. The duration of thermal activity involving patassic silicates （biotite and K-feldspar） alteration ranges from （235.4±2.4） Ma to （221.5±2.0） Ma determined by K-Ar dating. The age of the quartz-molybdenite stage is （213±3. 8） Ma by molybdenite Re-Os dating, the plateau ages （214. 58±0. 91） Ma to （216. 0±1） Ma of the biotite from the main Cubearing orebody and Cu-Mo-bearing orebody of the Pulang district are the Late Triassic Norian, consistent with the Re-Os dating. These data suggest that the ore-formation of the Pulang porphyry copper deposit developed in Indosinian. The host intrusion has a distinct alteration zoning from the centre outward, formed the strong silisification zone （locally）→potassic silicate （K-felspar ＋biotite） zone→phyllic zone→propyllic zone （locally developed illite-carbonate zone）. The industrial orebodies are mainly hosted within the zones of potassic silicate and phyllic of the quartz monzonite porphyry. The deposit is of the three-storeyed model which consists of the orebodies with structures of dissaminated at the lower part, v

关 键 词：云南 普朗 斑岩铜矿 成矿模型 

分 类 号：P618.41[天文地球—矿床学]