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THE CHARACTERISTICS OF NEODYMIUM AND STRONTIUM ISOTOPES FROM LATE PROTEROZOIC GRANITE MASSES IN BENDONG AND SANFANG, GUANGXI

Li Zhichang Zhao Zijie ( Yichang Institute of Geology Mineral Resources)  
The average ∑_Nd~((t)) values of Late Proterozoic ganite masses in Bendong and Sanfang of Guangxi are respectively -5.0+0.38(7) and -6.7±0.68(8), but the ∑_Sr~((t)) values vary greatly. The Neodymium model age average value T_DM~Nd value in Bendong mass is 2120 Ma. According to their distribution characteristics on ∑_Sr~((t))-∑_Nd~((t)) and ∑_Nd~((t))--T maps, their genetic types are considered to be the same roughly, that is to say, they are derived from the same magmatic reservoir. This magmatic reservoir was the completely remetling product of the lower crust material one billion years ago and during its evolution, a small amount of deficient mantle material was added, the Sanfang mass was assimilated and contaminated with a large amount of sedimentary rocks. The forming age of the lower crust represented by Sibu group is more than 2120 Ma. The post-magmatic autometasomatism and pneumatolic-hydrothermal process leaded to the increase of the ratio of Rb to Sr, the decrease of ∑_Sr~((t)) and the redifferentiation of Sr-Nd system in rocks.
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