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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 被引量:34

Genetic Types of Phyllosilicate(Micas) and Its ^(39)Ar-^(40)Ar Dating in Lannigou Gold Deposit,Guizhou Province,China
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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.
出处 《矿物学报》 CAS CSCD 北大核心 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)
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 phyllosilicate EPMA ^39 Ar-^40 Ar dating Carlin-type deposit Lannigou gold deposit Guizhou
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