Genetic Types of Phyllosilicate (Micas) and Its 39Ar-40Ar Dating in Lannigou Gold Deposit, <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Guizhou Province</st1:City>, <st1:country-region w:st="on">China</st1:country-region></st1:place> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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

详细信息

责任者：Chen Maohong (China University of Geosciences ; Beijing 100083 ; China) ; Huang Qingwen
刊名：Acta Mineralogica Sinica
出版年：2009
卷期：29(3)
关键词：卡林型金矿床 ; Carlin-type gold deposit ; Ar ; Ar dating ; 层状硅酸盐 ; sheet silicates ; 贵州 ; Guizhou Province
页码：p.353-362
图表：6 illus., 7 tables, 23 refs.
分类号：1001
issnNo：ISSN1000-4734
isbnNo：CN52-1045/P

摘要

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 Province: clastic flakes of muscovite, diagenesis or metamorphic hydromuscovite, fine-grained matrix alteration illite, and vein-filling hydrothermal sericite. 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.

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