| 粤西河台金矿床富硫化物石英脉Rb-Sr等时线年龄讨论 |
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| 关键词:Hetai gold deposit sulfide-rich quartz vein Rb-Sr isochron age |
| 基金项目:国家自然科学基金项目(编号:49873018)，广东省自然科学基金项目(编号:001255) |
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| 摘要: |
| Rb-Sr Isochron Age of Sulfide-rich Quartz Veins in the Hetai Gold Deposit, Western Guangdong |
| The Hetai gold deposit is hosted in Hetai ductile shear zone. Its ore-forming process can be divided into the ductile shear metamorphic ore-forming stage of the ductile shear metamorphic metallogenic epoch and the gold quartz vein stage,gold sulfide stage and galena-sphalerite-carbonate vein stage of the hydrothermal alteration metallogenic epoch. Gold mineralization occurred mainly in the gold quartz vein stage and the gold sulfide stage. The two types of ores thus formed are altered mylonites and sulfide-rich quartz veins. Individual mineral quartz in sulfide-rich quartz veins contain many fluid inclusions consisting mainly of CO_2-rich liquid,fluid-melt inclusions and melt inclusions. Different from the previously-used Rb and Sr extraction method of decrepitation and crushing of fluid inclusions,the method used by the authors lies in dissolving quartz to obtain the Rb-Sr isochron age of quartz in sulfide-rich quartz vein. The result shows that the age is 172±2 Ma(1σ)and the initial 87 Sr/ 86 Sr ratio is 0.72816±0.00096. Considering other researchers′ isotopic ages and regional metallogenic characteristics,it is held that this isochron age may represent the metallogenic age of the Hetai gold deposit. |
| ZHAI Wei,LI Zhao-lin,HUANG Dong-lin,WEN Yong-jun.2004.Rb-Sr Isochron Age of Sulfide-rich Quartz Veins in the Hetai Gold Deposit, Western Guangdong[J].Acta Geoscientica Sinica,25(2):243-247. |
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