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丹东地区是中国重要的金矿集中区,到目前为止还没有较准确的成岩成矿年代数据报道。本文采用Rb-Sr等时线法和单颗粒锆石U-Pb法分别测出了丹东三股流花岗岩成岩年龄为131±5Ma和129±3Ma,因此三股流花岗岩综合同位素年龄定为130 Ma。五龙金矿主成矿阶段石英流体包裹体Rb-Sr等时线年龄为120±3Ma。这一组年龄数据理顺了该地区构造—岩浆—成矿的时序关系,对中国东部金矿成矿对比研究提供了有效的年龄数据。Sr、Nd同位素的示踪结果表明三股流花岗岩的成岩物质与下地壳物质有关。三股流花岗岩和矿体(含金石英脉)相似的Sr同位素初始比值,说明成矿和成岩物质可能来自深部同一岩浆源区。
Dandong is an important gold mine in China. So far, no accurate data on the age of diagenesis and mineralization have been reported. In this paper, the granitoid ages of the Dandong Sanchuang Granites were 131 ± 5Ma and 129 ± 3Ma, respectively, using the Rb-Sr isochron method and the single-grain zircon U-Pb method. Therefore, the comprehensive isotopic age of the Sanliu granitoid was set at 130 Ma. The Rb-Sr isochron age of the quartz fluid inclusions in the main mineralization stage of Wulong gold deposit is 120 ± 3Ma. This set of age data streamlines the tectonic-magmatic-metallogenic sequence of the area and provides valid age-related data on the metallogenic correlation of gold deposits in eastern China. The tracing results of Sr and Nd isotopes indicate that the diagenetic material of the Sanhe Flow Granite is related to the material of the lower crust. The similar initial ratios of Sr isotopes between the three streams of granites and orebodies (gold-bearing quartz veins) suggest that the ore-forming and diagenetic material may come from the same magmatic source in the deep area.