云南普朗斑岩型铜矿床成矿流体特征及矿床成因  

Characteristics of the Ore-Forming Fluid and Genesis of the Pulang Copper Deposit in Yunnan Province

作　　者：李文昌[1,2] 尹光侯 余海军 薛顺荣 王可勇[3] 王承洋[3] 王文旭[3] 

机构地区：[1]云南省地质调查局科技规划处,昆明650051 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]吉林大学地球科学学院,长春130061

出　　处：《吉林大学学报（地球科学版）》2013年第5期1436-1447,共12页Journal of Jilin University：Earth Science Edition

基　　金：国家"973"计划项目(2009CB421007)

摘　　要：普朗铜矿床为滇西北地区一超大型斑岩型铜多金属矿床,它产于印支晚期石英闪长玢岩-石英二长斑岩-花岗闪长斑岩复式侵入体内,已有研究表明其形成于印支期。本次流体包裹体岩相学、显微测温及碳、氢、氧同位素综合研究表明:黄铜矿±黄铁矿-石英脉石英中主要发育含NaCl子矿物三相、气液两相及富气相3种类型的包裹体,成矿流体属中高温、高盐度(ω(NaCl))NaCl-H_2O热液体系,来源于印支晚期岩浆活动;辉钼矿±黄铜矿-石英脉石英中发育含NaCl子矿物三相、气液两相及含CO_23种类型的包裹体,成矿流体属中高温、高盐度NaCl-CO_2-H_2O热液体系,推测来源于后期岩浆活动;晚期黄铜矿±辉钼矿-方解石脉中主要发育气液两相包裹体,成矿流体为中低温、低盐度NaCl-H_2O热液体系,系NaClCO_2-H_2O型成矿流体演化产物。据此,结合区域广泛叠加发育燕山期斑岩钼矿化成矿背景,提出普朗超大型斑岩矿床可能存在燕山期Mo、Cu成矿作用叠加的认识。The Pulang copper deposit is a superlarge porphyry type polymetallic deposit in northwestern Yunnan Province. It occurs in an Indosinian quartz diorite-quartz monzonite porphyry- granodiorite porphyry complex and previous study showed it was formed during the Indo-Chinese period. Comprehensive studies on petrology, microthermometry as well as carbon-hydrogen-oxygen isotope of fluid inclusions showed that there are such three types of fluid inclusions as halite-bearing three-phase, aqueous two-phase as well as vapor-rich in quartz from chalcopyrite± pyrite-quartz veins, the ore- forming fluids are of medium to high temperature, high salinity NaCl - H2O type hydrothermal solutions and mainly derived from the Indonisian magmatism; whereas three types of fluid inclusions, including halite-bearing three-phase, aqueous two-phase as well as COe-bearing three-phase respectively are observed in quartz from molybdenite± chalcopyrite-quartz veins, the ore-forming fluids are of medium to high temperature, high salinity NaC1 - CO2 - H20 type hydrothermal solutions and might come from later magmatism. Only aqueous two-phase fluid inclusions are found in calcite from the latest chalcopyrite^molybdenite-caleite veins and the ore-forming fluids are of low to medium temperature, low salinity NaC1 - H20 type hydrothermal solutions, a later evolution product of the former NaCI - CO2 H20 type hydrothermal solutions is presumed. In combination with the regional metallogenie background that Mo and Cu mineralization in the Yanshanian period are widely spread in the area, so the conclusion can be drawn that in the Pulang copper deposit Mo and Cu mineralization of the Yanshanian period might also co-exist.

关 键 词：普朗铜矿床 成矿流体特征 矿床成因 同位素 云南 

分 类 号：P618.41[天文地球—矿床学]