LA-ICP-MS zircon U-Pb dating of dikes in the Dajing copperpolymetallic deposit and a discussion on the metallogenic epoch
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摘要:
内蒙古林西县大井矿床是与次火山岩有关的热液脉型矿床，矿体受NW向、NWW向断裂控制，产出在二叠系林西组中。用LA-ICP-MS技术，测得成矿前的霏细岩脉和安山玢岩脉中的锆石206Pb/238U年龄分别为164.1±0.8Ma（MSWD=0.60，n=16）和253.8±1.1Ma（MSWD=0.96，n=14）。其中霏细岩锆石年龄表明，其形成可能与西伯利亚板块和蒙古-华北板块之间的鄂霍茨克洋碰撞造山有关；安山玢岩可能与华北板块与西伯利亚板块碰撞造山有关。通过成矿前脉岩的锆石年龄，可以限定大井矿床的成矿时代晚于164Ma。结合前人研究结果，推测大井铜多金属矿床的形成主要受控于晚侏罗世-早白垩世岩浆活动。
Abstract:The Dajing deposit was previously regarded as a magmatic hydrothermal type deposit.The orebodies are controlled by the NW-and NWW-trending faults and occur in Permian Linxi Formation. The zircon samples collected during the research were dated by using LA-ICP-MS zircon U-Pb method, and the authors obtained the following results:the zircon U-Pb ages are 164.1±0.8Ma (MSWD=0.60, n=16) and 253.8 ±1.1Ma (MSWD=0.96, n=14) for felsite dikes and andesite porphyry dikes, respectively. Felsite dikes were formed in a collisional setting probably related to the closure of Mongolia-Okhotsk Ocean and post collision, while andesite porphyry dikes were formed in a tectonic setting possibly related to the collision between Siberian Plate and North China Plate. Based on the zircon U-Pb ages of dikes obtained, the authors have reached the conclusion that the ore-forming process of the Dajing polymetallic deposit occurred later than 164Ma. The most intense volcanic-magmatic activities of the Da Hinggan Mountains took place during Middle Yanshanian period. It is therefore held that the ore-forming process of the Dajing polymetallic deposit occurred approximately in Late Jurassic-Early Cretaceous.
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表 1 大井矿床脉岩LA-ICP-MS锆石U-Th-Pb同位素测试数据
Table 1. LA-ICP-MS zircon U-Th-Pb isotope dating data of the Dajing deposit dikes
测点号 含量/10-6 Th232/U238 同位素比值 年龄/Ma Pb 232Th 238U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ DJ-17 1 138 193 164 1.17 0.02576 0.00207 0.1756 0.0180 0.04944 0.00274 163.94 13.01 164.30 15.58 169 132 2 35.2 35.8 45.1 0.79 0.03526 0.00054 0.2510 0.0057 0.05166 0.00095 223.37 3.38 227.41 4.64 333 47 3 217 334 286 1.17 0.02290 0.00031 0.1578 0.0031 0.04994 0.00067 145.97 1.94 148.74 2.72 191 36 4 73.0 114 216 0.53 0.02558 0.00029 0.1829 0.0024 0.05188 0.00033 162.80 1.83 170.56 2.04 280 15 5 53.4 76.8 108 0.71 0.03476 0.00049 0.2461 0.0051 0.05144 0.00091 220.24 3.08 223.41 4.18 261 41 6 11.5 19.6 52.3 0.38 0.02439 0.00030 0.1635 0.0054 0.04873 0.00158 155.37 1.92 153.78 4.72 200 76 7 76.7 111 115 0.96 0.03589 0.00057 0.2715 0.0062 0.05484 0.00083 227.32 3.57 243.91 4.94 406 33 8 40.7 95.7 149 0.64 0.02556 0.00048 0.1735 0.0036 0.04937 0.00070 162.67 3.02 162.49 3.10 165 33 9 48.1 55.2 108 0.51 0.02577 0.00031 0.1763 0.0031 0.04955 0.00062 164.00 1.98 164.85 2.70 172 34 10 92.1 185 276 0.67 0.02552 0.00037 0.1777 0.0033 0.05058 0.00087 162.48 2.34 166.12 2.87 220 36 11 85.6 170 141 1.20 0.02578 0.00020 0.1750 0.0024 0.04927 0.00057 164.10 1.27 163.75 2.04 161 28 12 64.4 154 155 0.99 0.02602 0.00018 0.1789 0.0018 0.04989 0.00040 165.60 1.13 167.08 1.53 191 19 13 62.7 153 154 0.99 0.02605 0.00018 0.1839 0.0022 0.05118 0.00050 165.81 1.12 171.40 1.90 256 19 14 35.9 30.3 55.8 0.54 0.03684 0.00041 0.2706 0.0057 0.05335 0.00103 233.21 2.53 243.18 4.59 343 44 15 48.6 127 122 1.04 0.02559 0.00024 0.1697 0.0022 0.04812 0.00046 162.86 1.49 159.13 1.94 106 22 16 39.9 66.2 114 0.58 0.02576 0.00027 0.1715 0.0024 0.04851 0.00057 163.93 1.69 160.76 2.04 124 28 17 12.7 31.6 33.9 0.93 0.03774 0.00064 0.2784 0.0085 0.05361 0.00140 238.79 3.97 249.42 6.74 354 59 18 22.9 41.3 111 0.37 0.02548 0.00026 0.1716 0.0023 0.04889 0.00048 162.21 1.61 160.82 2.00 143 22 19 60.1 79.9 200 0.40 0.02583 0.00043 0.1829 0.0035 0.05141 0.00061 164.38 2.68 170.52 3.04 261 28 20 53.0 74.5 178 0.42 0.02550 0.00027 0.1728 0.0022 0.04917 0.00039 162.35 1.70 161.85 1.92 167 -12 21 34.1 62.8 171 0.37 0.02590 0.00024 0.1771 0.0023 0.04960 0.00042 164.83 1.49 165.60 1.94 176 14 22 180 144 127 1.14 0.04721 0.00081 0.3601 0.0081 0.05532 0.00079 297.37 4.97 312.33 6.04 433 31 23 37.3 60.5 166 0.36 0.02576 0.00025 0.1732 0.0022 0.04880 0.00040 163.93 1.60 162.23 1.89 139 23 24 51.2 137 105 1.31 0.02590 0.00025 0.1803 0.0024 0.05058 0.00054 164.85 1.55 168.34 2.06 220 29 25 6.4 27.8 89.4 0.31 0.02574 0.00023 0.1706 0.0023 0.04814 0.00054 163.82 1.46 159.97 1.99 106 26 LT-1 1 15.8 40.1 71.5 0.56 0.039646732 0.00031 0.2810 0.0035 0.05150 0.00059 250.64 1.94 251.47 2.76 265 32 2 70.8 164 187 0.88 0.040142328 0.00027 0.2832 0.0025 0.05117 0.00031 253.72 1.69 253.21 2.00 256 13 3 111 77.4 92.7 0.83 0.137054038 0.00106 1.2408 0.0105 0.06569 0.00032 827.98 5.98 819.25 4.78 798 9 4 33.5 55.0 119 0.46 0.056741431 0.00042 0.4188 0.0041 0.05354 0.00036 355.78 2.56 355.21 2.94 350 12 5 59.6 119 133 0.89 0.040309774 0.00028 0.2832 0.0025 0.05098 0.00033 254.75 1.76 253.23 2.01 239 10 6 63.2 133 243 0.55 0.040422304 0.00027 0.2897 0.0024 0.05198 0.00029 255.45 1.66 258.29 1.85 283 13 7 13.3 30.2 34.5 0.88 0.03999033 0.00036 0.2761 0.0047 0.05026 0.00082 252.77 2.24 247.53 3.71 206 37 8 30.7 52.2 72.4 0.72 0.040090713 0.00034 0.2810 0.0034 0.05085 0.00049 253.40 2.12 251.46 2.72 235 22 9 45.0 96.2 141 0.68 0.040641293 0.00035 0.2846 0.0033 0.05074 0.00038 256.81 2.17 254.26 2.57 228 21 10 19.8 36.0 73.2 0.49 0.046366291 0.00041 0.3315 0.0038 0.05191 0.00045 292.17 2.54 290.72 2.87 280 20 11 132 223 154 1.44 0.040519224 0.00029 0.2830 0.0026 0.05067 0.00033 256.05 1.83 253.00 2.02 233 17 12 167 86.9 79.6 1.09 0.124374173 0.00100 1.1164 0.0100 0.06510 0.00031 755.69 5.76 761.27 4.80 777 9 13 119 145 116 1.25 0.054195981 0.00038 0.4030 0.0038 0.05394 0.00038 340.23 2.32 343.80 2.75 369 15 14 64.5 106 132 0.80 0.03974916 0.00030 0.2812 0.0026 0.05134 0.00035 251.28 1.86 251.60 2.09 257 17 15 76.3 111 145 0.77 0.040364173 0.00029 0.2854 0.0026 0.05132 0.00034 255.09 1.80 254.93 2.04 254 47 16 96.3 156 71.0 2.20 0.039882294 0.00044 0.2677 0.0065 0.04862 0.00087 252.10 2.74 240.84 5.23 128 43 17 26.5 38.6 40.0 0.96 0.039738781 0.00037 0.2830 0.0055 0.05179 0.00097 251.21 2.29 253.04 4.36 276 43 18 69.9 54.4 89.0 0.61 0.070886621 0.00053 0.5458 0.0051 0.05586 0.00034 441.50 3.17 442.25 3.32 456 15 19 77.6 105 142 0.74 0.040236769 0.00035 0.2823 0.0029 0.05097 0.00038 254.30 2.16 252.51 2.28 239 19 20 64.2 124 51.9 2.39 0.039626503 0.00059 0.2825 0.0081 0.05199 0.00174 250.52 3.66 252.62 6.39 283 81 
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