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)