贵州烂泥沟金矿层状硅酸盐矿物及其^(39)Ar-^(40)Ar年代学研究  

Genetic Types of Phyllosilicate(Micas) and Its ^(39)Ar-^(40)Ar Dating in Lannigou Gold Deposit,Guizhou Province,China

作　　者：陈懋弘[1,2] 黄庆文[1] 胡瑛[1] 陈振宇[2] 章伟[1] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿物学报》2009年第3期353-362,共10页Acta Mineralogica Sinica

基　　金：中央级公益性科研院所基本科研业务费专项资金(K2007-1-2);中国博士后科学基金(20080430456);国家重点基础研究发展计划(973计划)(2007CB411407)

摘　　要：野外地质和室内光学显微镜、EPMA和XRD分析研究表明,贵州烂泥沟金矿矿石中存在4种不同成因的层状硅酸盐矿物(云母类),即碎屑成因白云母、成岩或变质成因水云母、基质热液蚀变交代成因伊利石和热液脉状充填成因绢云母。后两类矿物与金成矿过程中的热液蚀变有关,其中热液脉状充填绢云母形成于第四成矿阶段,其39Ar4-0Ar阶段升温测年法获得坪年龄为(194.6±2)Ma,代表了成矿末期热液蚀变的年龄,即成矿时代的上限。The studies, including optical petrography and mineragraphy, EPMA and XRD, show that four different generation phyllosilicate （micas） were distinguished petrographically in Lannigou gold deposit of Guizhou： clastic flakes of muscovite, diagenesis or metamorphic hydromuscovite, fine-grained matrix alteration illite, and vein-filling hydrothermal serieite. Of the four, the latter two are related with the hydrothermal alteration and gold mineralization. The ^39Ar-^40Ar dating of vein-filling hydrothermal sericites ,formed during the fourth metallogenic stage, gives a plateau age of （ 194. 6 ± 2） Ma, which represents the age of the latest hydrothermal alteration during the mineralization period, that is, the upper limit of ore-forming time.

关 键 词：层状硅酸盐矿物 EPMA ^39Ar-^40Ar测年 卡林型金矿 贵州烂泥沟金矿 

分 类 号：P571[天文地球—矿物学] P579[天文地球—地质学]