西藏尕尔穷铜金矿床矿石特征及成因意义  

Ore Characteristics and Genesis Significance of Ga’erqiong Copper-Gold Deposit,Tibet,China

作　　者：何佳乐[1] 孙燕[1] 王强[1] 李志军[1] 龚婷婷[1] 张世铭[1] 王瑜亮[1] 

机构地区：[1]成都理工大学,四川成都610059

出　　处：《矿物学报》2013年第1期49-56,共8页Acta Mineralogica Sinica

基　　金：国家公益性行业科研专项(资助号:201011013-3)

摘　　要：通过野外地质调查、镜下鉴定、扫描电镜、电子探针、流体包裹体测温等方法和手段,对尕尔穷铜金矿的矿石组构、矿物成分、成矿温度、成矿期及成矿阶段进行了研究。结果表明,矿石成分以氧化物、硫化物及硫盐矿物为主,自然元素矿物、金-银系列互化物次之,发现了自然元素矿物自然铁、自然铋和铜锌合金矿物,工业铋矿物-辉铋矿。矿石具块状、浸染状、细脉浸染状构造,以结晶结构、交代结构为主。成矿温度以高—中温为主。含矿岩体锆石U-Pb年龄为83.2-87.1 Ma,辉钼矿Re-Os模式年龄为86.87-87.29 Ma。与成矿有关的围岩蚀变主要为夕卡岩化、硅化。成矿过程具多期多阶段的特点,其中岩浆期后热液交代作用是主要的成矿作用。矿床成因类型为岩浆期后热液接触交代作用形成的夕卡岩型铜金矿床。Ga＇erqiong skarn-type copper-gold deposit is firstly detailed prospected deposit in the Bangong-nujiang metallogenic belt. In this paper, based on the geological observations, microthermometric, EDS, EPMA and fluid inclusions analyses, we provide the structures of ore, compositions of mineral, temperature of mineralization and mineralization and metallogenic stage. Ore are dominated by oxides, sulphides and sulfates, followed by Au-Ag minerals and natural minerals. Rare natural elements minerals including natural Fe, natural Bi, Cu-Zn alloy mineral and industrial bismuth minerals-bismuthinite are found. Ore structures are mainly resulted from crystallization and metasomatism. Disseminated and veinlet textures are major textures in the ores. The main ore-forming temperature is high-medium. The zircon U-Pb age of ore-bearing pluton is 83.2-87.1 Ma, and the molybdenite Re-Os age is 86.8-93.2 Ma. Wall-rock alterations mainly related to mineralization are skarn and silicified. Ore-forming process have the characteristics of multi-stage. Magmatic hydrothermal metasomatism is the main mineralization. The deposit is skarn-type copper-gold deposit with the genesis from magmatic hydrothermal contact-metasomatism.

关 键 词：铜金矿床 矿石特征 成因 尕尔穷 西藏 

分 类 号：P571[天文地球—矿物学]