Diagenetic and metallogenic ages, and geological significance of the Fujiashan skarn-type(Cu-) W Deposit, southeastern Hubei Province
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摘要: 付家山(Cu-)W矿床是鄂东南地区新近发现的大型矽卡岩型矿床之一,成矿与花岗闪长斑岩关系密切。为了精确获得该矿床成岩成矿年龄,利用LA-ICP-MS锆石U-Pb和辉钼矿Re-Os同位素定年法对其进行了系统的成岩成矿年代学研究,并基于长江中下游成矿带晚中生代沉积地层及构造变形、地球物理和岩石地球化学等证据探讨了其成岩成矿构造背景。结果显示:花岗闪长斑岩锆石U-Pb加权平均年龄为(144±3)Ma,而辉钼矿Re-Os模式年龄为(146±2)Ma,成岩与成矿作用均形成于晚侏罗世-早白垩世。付家山(Cu-)W矿床形成时代与长江中下游地区大规模岩浆成矿事件时间一致,包括鄂东南地区在内的长江中下游地区的构造演化历史及最新的年代学数据表明,付家山(Cu-)W矿床极有可能形成于岩石圈伸展减薄构造背景。付家山等晚侏罗世-早白垩世矽卡岩型(Cu-)W矿床的发现及厘定指示了鄂东南矿集区具有良好的钨矿找矿前景。Abstract: The Fujiashan(Cu-) W Deposit, which is discovered recently, is one of the typical skarn deposit in southeastern Hubei.The(Cu-) W mineralization is closely associated with the Fujiashan granodiorite porphyry.In order to accurately determine the diagenetic and metallogenic ages of the deposit, ages of the granodiorite porphyry and (Cu-) W mineralization are studied by using LA-ICP-MS zircon U-Pb and molybdenite Re-Os isotopic dating in this paper. In addition, the tectonic setting of diagenesis and mineralization is discussed based on the sedimentary strata, structural deformation, geophysical and geochemical evidences in the middle and lower reaches of the Yangtze River during the Late Mesozoic.The results show that the granodiorite porphyry yields a weighted average 206Pb/238U age of (144±3) Ma, whereas a Re-Os model age of molybdenite of (146±2) Ma is obtained for mineralization.These isotopic ages indicate that the granodiorite porphyry and(Cu-) W mineralization at Fujiashan both formed during Late Jurassic-Early Cretaceous.In addition, the diagenesis and mineralization ages of the Fujiashan(Cu-) W Deposit are also consistent with the time of large-scale magmatic and metallogenic events for skarn Fe-Cu-Au-Mo deposits in the middle and lower reaches of the Yangtze River.According to the history of tectonic evolution and the latest chronological data in the middle and lower reaches of the Yangtze River, including southeastern Hubei, it is considered that the Fujiashan(Cu-) W Deposit is likely to be formed in a tectonic setting of lithospheric extension and thinning.The discovery and determination of Late Jurassic-Early Cretaceous skarn(Cu-) W Deposits including the Fujiashan indicate that the ore concentration area in southeastern Hubei has a good explorational prospect for tungsten deposits.
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图 1 鄂东南矿集区典型岩体及矽卡岩型矿床分布图(据文献[21]修改)
Figure 1. Distribution map of magmatism and skarn-type deposits in the southeastern Hubei Province
图 2 付家山(Cu-)W矿床地质简图(据文献[12]修改)
Figure 2. Geological map of the Fujiashan (Cu-)W deposit
图 3 付家山(Cu-)W矿床西侧矿区1011线(a)和东侧矿区17线(b)地质剖面图(据文献[13])
Figure 3. Geological profiles of Line 1011(a) in the western section and Line 17(b) in the eastern section of the Fujiashan(Cu-)W district
表 1 付家山花岗闪长斑岩(FJS-26)LA-ICP-MS锆石U-Pb同位素数据
Table 1. LA-ICP-MS zircon U-Pb isotopic data of the Fujiashan granodiorite porphyry(sample FJS-26)
分析点号 元素wB/10-6 Th/U 同位素比值 年龄/Ma Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ FJS-26-01 225.2 445.1 0.51 0.051 9 0.003 3 0.153 7 0.009 8 0.021 6 0.000 5 283 153 145 9 138 3 FJS-26-03 1 022.6 838.6 1.22 0.052 6 0.002 0 0.162 6 0.006 2 0.022 3 0.000 3 322 81 153 5 142 2 FJS-26-05 413.6 479.3 0.86 0.056 2 0.002 4 0.179 0 0.007 5 0.023 2 0.000 3 461 94 167 6 148 2 FJS-26-06 469.3 620.6 0.76 0.047 8 0.001 7 0.146 6 0.005 2 0.022 2 0.000 3 100 -114 139 5 141 2 FJS-26-07 254.7 384.1 0.66 0.047 9 0.003 2 0.159 6 0.010 7 0.024 0 0.000 4 98 152 150 9 153 2 FJS-26-08 238.7 319.5 0.75 0.048 8 0.002 2 0.154 6 0.006 5 0.023 2 0.000 3 200 104 146 6 148 2 FJS-26-09 246.4 381.6 0.65 0.046 6 0.002 3 0.147 8 0.007 0 0.023 2 0.000 3 32 111 140 6 148 2 FJS-26-10 869.0 657.8 1.32 0.050 5 0.002 1 0.152 0 0.006 1 0.021 9 0.000 3 220 101 144 5 140 2 FJS-26-11 156.3 238.4 0.66 0.052 8 0.003 3 0.173 1 0.010 8 0.023 8 0.000 4 317 141 162 9 152 3 FJS-26-12 1 039.4 749.6 1.39 0.048 3 0.001 8 0.147 1 0.005 5 0.022 1 0.000 3 117 89 139 5 141 2 FJS-26-13 303.1 240.4 1.26 0.051 1 0.003 1 0.163 6 0.008 8 0.023 6 0.000 4 256 137 154 8 150 2 FJS-26-14 473.0 529.1 0.89 0.050 1 0.002 0 0.162 1 0.006 6 0.023 4 0.000 3 198 99 153 6 149 2 FJS-26-15 390.1 513.7 0.76 0.050 5 0.002 1 0.157 2 0.006 3 0.022 6 0.000 3 217 94 148 6 144 2 FJS-26-16 590.7 831.7 0.71 0.049 1 0.001 7 0.145 4 0.005 0 0.021 5 0.000 3 150 77 138 4 137 2 FJS-26-18 515.0 657.6 0.78 0.048 8 0.001 7 0.152 4 0.005 6 0.022 6 0.000 3 200 85 144 5 144 2 FJS-26-19 689.9 659.9 1.05 0.050 3 0.001 9 0.148 8 0.005 7 0.021 4 0.000 2 209 90 141 5 136 2 FJS-26-20 307.9 357.1 0.86 0.049 2 0.002 5 0.162 1 0.008 2 0.024 1 0.000 4 167 120 153 7 154 3 表 2 付家山(Cu-)W矿床辉钼矿Re-Os同位素组成
Table 2. Re-Os isotopic composition of Molybdenite from the Fujiashan(Cu-)W deposit
样品编号 质量/g w(Re)/10-6 w(Os普)/ 10-6 w(187Re)/10-6 w(187Os)/10-6 模式年龄t/Ma FJS-31 0.002 06 267.5±2.4 5.151±0.162 168.1±1.5 409.1±2.4 146±2 表 3 鄂东南地区典型矽卡岩型矿床成岩成矿年龄统计
Table 3. Statistics of diagenetic and metallogenic ages of typical skarn deposits in southeastern Hubei Province
岩体名称 岩石名称 成岩时代/Ma 测试对象 成矿或蚀变年龄/Ma 测试方法 资料来源 付家山 花岗闪长斑岩 144±3 LA-ICP-MS锆石U-Pb 本文 矿体 146±2 辉钼矿Re-Os 龙角山 花岗闪长斑岩 144±1 LA-ICP-MS锆石U-Pb 文献[11] 矿体 144.7±2.9 辉钼矿Re-Os 鸡冠咀 石英正长闪长玢岩 146±2 SHRIMP U-Pb 文献[37] 闪长岩 132±4 SHRIMP U-Pb 矿体 138.2±2.2 辉钼矿Re-Os 文献[19] 蚀变岩 140.3±1.1 金云母40Ar/39Ar 桃花咀 矿体 138.3±2 辉钼矿Re-Os 文献[19] 矽卡岩 139.9±1.1 金云母40Ar/39Ar 铜绿山 石英正长闪长玢岩 146±1 SHRIMP U-Pb 文献[38] 石英闪长岩 140±2 SHRIMP U-Pb 文献[19] 矿体 137.8±1.7 辉钼矿Re-Os 文献[15] 矿体 138.1±1.8 辉钼矿Re-Os 矿体 137.3±2.4 辉钼矿Re-Os 文献[19] 矽卡岩 136.0±1.3 LA-ICP-MS榍石U-Pb 文献[35] 姜桥 花岗闪长岩 144±1 LA-ICP-MS锆石U-Pb 文献[39] 铜山口 花岗闪长岩 140.6±2.4 SHRIMP U-Pb 文献[30] 矿体 143.8±2.6 辉钼矿Re-Os 阮家湾 花岗闪长岩 143±1 SHRIMP U-Pb 文献[40] 矿体 143.6±1.7 辉钼矿Re-Os 文献[15] 犀牛山 花岗闪长斑岩 147±1 SHRIMP U-Pb 文献[40] 丰山 花岗闪长斑岩 137±2 SHRIMP U-Pb 文献[37] 矿体 144±2.1 辉钼矿Re-Os 文献[15] 鸡笼山 花岗闪长斑岩 138±2 SHRIMP U-Pb 文献[37] 岩体 151.8±0.7 锆石U-Pb 文献[41] 矿体 150.7±0.8 辉钼矿Re-Os -
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