Rb-Sr Isochron Age of Single-Grain Muscovite in the Xushan W-Cu Deposit, Central Jiangxi, and Its Geological Significance
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摘要: 徐山钨铜矿位于江西省中部，是一个由石英脉型、矽卡岩型、花岗岩型3种类型"叠置"的三位一体矿床，其中石英脉型和花岗岩型矿体及其相互关系基本符合"五层楼+地下室"或者"上脉下体"型钨矿床的特征.首次利用Rb-Sr等时线法对该矿床含黑钨矿石英脉的镶边白云母进行了亚样品定年，获得其成矿年龄为147.1±3.4 Ma(MSWD=0.71).该矿床的形成年龄与江西南部的石英脉型钨矿床相似，都形成于燕山中期；而与赣东北、赣西北的铜矿床成矿时间有较明显差异.白云母的ISr值很高，为0.849±0.026，其原因可能是成矿花岗岩浆本身来源于演化程度和成熟度较高的壳源岩石，而成矿流体在水-岩反应的过程中又萃取了岩石中具有异常高87Sr/86Sr比值的Sr.高ISr值也反映了相关的花岗岩及矿床形成过程中基本上没有幔源物质的参与.Abstract: The Xushan tungsten-copper deposit is located in the central part of Jiangxi Province. It is a trinity deposit comprising three types of ore-bodies, i.e. quartz vein type, skarn type, and granite type. Rb-Sr micro-isochron method is first applied to determining the ore-forming age by using single grain of muscovite growing at the edge of the wolframite-quartz vein type tungsten ore. Result shows that the mineralization age is 147.1±3.4 Ma, with MSWD=0.71, and the ISr value is 0.849±0.026. This ore-forming age is similar to those of quartz-wolframite-vein tungsten deposits in southern Jiangxi, but is much later than the ages of copper deposits in northeastern Jiangxi and slightly earlier than the ages of copper deposits in northwestern Jiangxi. The very high ISr value may suggest that the ore-related granite was a melting product of highly evolved and highly saturated crust material, and the ore-forming fluids have extracted the strontium of extremely high 87Sr/86Sr ratios from the granite through water-rock interaction. It also suggests that there was almost no contribution of mantle material during the formation of either ore-related granite or tungsten mineralization.
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Key words:
- muscovite /
- Rb-Sr dating /
- geochronology /
- ultra-low procedural blank /
- high ISr value /
- Xushan W-Cu deposit
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图 1 徐山钨铜矿大地构造位置略图
1.徐山钨铜矿；2.断裂；3.构造边界；4.背斜轴；5.地名；6.华北板块；7.扬子板块；8.华夏板块
Fig. 1. A sketch tectonic map of Xushan W-Cu deposit
图 2 徐山钨铜矿区地质简图(据钟文华，1989修改)
1.第四系浮土；2~4.震旦系板溪群上部浅变质岩系；5.石英脉型钨矿
Fig. 2. The geological map of Xushan W-Cu ore district
图 3 徐山钨铜矿床0线剖面图(万大理，1991)
1.震旦系板溪群上部浅变质岩系；2.矽卡岩型钨矿；3.花岗岩型钨矿；4.石英脉型钨矿；5.燕山期黑云母花岗岩
Fig. 3. Central exploration section of Xushan W-Cu deposit
表 1 徐山钨铜矿床白云母Rb-Sr同位素测试结果
Table 1. Data of Rb-Sr isotope analysis for muscovite from Xushan W-Cu deposit
样品编号 质量(mg) Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr 误差(2σ) Xs-11-1 3.03 1 308.4 11.2 369.7 1.623 677 0.000 015 Xs-11-2 2.33 1 420.2 8.7 521.6 1.936 595 0.000 019 Xs-11-3 2.61 1 439.7 7.5 628.4 2.149 134 0.000 021 Xs-11-4 2.95 1 331.1 8.2 534.1 1.967 618 0.000 012 Xs-11-5 2.85 1 451.1 7.1 684.4 2.286 030 0.000 014 Xs-11-6 2.68 1 431.0 6.0 819.8 2.569 813 0.000 026 
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