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Rb-Sr DATING AND GENESIS OF CHANGKENG-FUWAN SUPERLARGE SILVER DEPOSIT IN WEST GUANGDONG

Liang Huaying Wang Xiuzhang Cheng Jingping Xia Ping Zhang Hu Shan Qiang (Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640) Zhang Guoheng (757 Geological Team, Guangdong Bureau of Geological and Mineralogical Resou  
Fuwan large silver deposit occured in silicolites and limestone directly under the unconformity between the lower Carboniferous limestone and the upper Triassic carbonaceous shale Silver vein composed of quartz, calcite, galena, sphalerite and different kinds of silver minerals occurs in limestone and siliceous rocks. Rb-Sr isochron age of fluid inclusion in quartz of silver vein is 69±8 5Ma, with strontium isotope initial ratio ( 87 Sr/ 86 Sr) I=0 7164. δ 18 O and δ D of ore-forming fluid of silver mineralization are in ranges of -0 864‰—4 1‰ and -39 8‰— -59‰, respectively, suggesting that the ore-forming fluid come from circulating meteoric water or formational water. Lead isotope of Changkeng-Fuwan silver ore body, which differs from that of ore-bearing strata, falls in the same region in 207 Pb/ 204 Pb- 206 Pb/ 204 Pb diagram as those of the Chadong silver orebody occured in Proterozic formation Based on the characteristics of lead isotope and Rb-Sr age, it is concluded that the Changkeng-Fuwan superlarge silver ore is the product of reworking processes. The first reworking process results in enrichment of silver in the source rock. The second reworking process leads the enriched silver to move out of the source rock to the boundaries between the limestone and silicolites as well as silicolites and carbonaceous shale and precipitate due to the sudden change of physico-chemical environment.
【Fund】: “九五”攀登计划;;国家自然科学基金
【CateGory Index】: P618.5
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