Fluid Inclusions and Geochronology of Wulunbulake Copper Deposit in Xinjiang
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摘要: 乌伦布拉克铜矿位于新疆东准噶尔野马泉-琼河坝铜多金属成矿带中,其矿床成因和成矿时代存在较大争议,从流体包裹体和锆石U-Pb定年等方面做了研究探讨.矿床主要发育富液相包裹体,成矿流体为低温(136.9~224.5℃)、低盐度(1.7%~5.6% NaCl eqv.)、低密度(0.97~1.01 g/cm3)流体,估算的成矿压力为2.76×107~4.49×107 Pa,对应的成矿深度为1.04~1.95 km,属于浅成矿床.激光拉曼探针测试结果表明流体液相组分主要为水,气相组分除水蒸气外,还含有一定量CH4、N2和H2.锆石U-Pb测年结果显示含矿石英闪长岩年龄为440.5±3.3 Ma,不含矿石英斑岩年龄为419.7±3.3 Ma,表明研究区至少经历了2期岩浆活动,成矿作用从早志留世就已开始.矿床由内向外发育典型的"斑岩型"蚀变分带(强硅化带-钾化带-绢英岩化带-青磐岩化带),表明乌伦布拉克铜矿为斑岩型铜矿,形成于志留纪古亚洲洋向南俯冲的岛弧环境.东准噶尔甚至新疆北部地区在志留纪处于岛弧环境,该时期的岩浆岩带是形成和寻找斑岩型铜矿的有利地区.Abstract: Wulunbulake copper deposit is located at the north-western segment of the Yemaquan-Qiongheba Cu-polymetallic metallogenic belt, East Junggar, Xinjiang. However, its genetic type and mineralizing age has been debated. This study presents new results on fluid inclusions and zircon U-Pb dating to precisely constrain the type and time of mineralization. The dominant fluid inclusions in Wulunbulake copper deposit are liquid-rich type, with low homogenization temperature (136.9-224.5℃), low salinity (1.7%~5.6% NaCl eqv.) and low density (0.97-1.01 g/cm3), the mineralizing pressure is 2.76×107-4.49×107 Pa and the corresponding depth is 1.04-1.95 km. The laser Raman spectroscopy results indicate that the ore-forming fluids consist of H2O, CH4, N2, H2. Zircon U-Pb dating results show that the formation age of ore-bearing quartz diorite and quartz porphyry is 440.5±3.3 Ma, and 419.7±3.3 Ma, respectively, indicating that there had experienced two-stage magmatic activities from Early Silurian. From the interior to the outer part of the deposit, there exist typical alteration zonation characteristics of porphyry deposits (silica alternation-potassic alternation-phyllic alternation-propylitization), and the geochemical characteristics of ore-bearing indicate that they were most possibly formed in arc setting. Its genetic type should be typical porphyry copper deposit and related to the southward subduction of the Paleo-Asian oceanic crust in the Early Silurian period. The East Junggar even northern Xinjiang was in the island arc environment in the Silurian, and the magmatic zone is a potential area for formation and prospecting of porphyritic Cu deposit.
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Key words:
- fluid inclusion /
- zircon U-Pb dating /
- porphyry copper deposit /
- East Junggar /
- geochronology
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图 6 乌伦布拉克铜矿流体包裹体盐度-均一温度分布图(a)和氢氧同位素组成图解(b)
图b数据1引自喻亨祥等(1998);数据2和3引自夏佐铎(2000)
Fig. 6. Homogenization-salinity (a) and δ18O vs. δD (b) diagrams of the fluid inclusions from Wulunbulake copper deposit
表 1 乌伦布拉克铜矿流体包裹体显微测温数据及估算参数
Table 1. Microthermometric data and estimation parameters of the fluid inclusions in quartz from Wulunbulake copper deposit
样品编号 测试点号 寄主矿物 冰点温度(℃) 均一温度(℃) 校正后均一温度(℃) 盐度(% NaCl eqv.) 密度(g/cm3) 压力(105 Pa) 深度(km) 1 -3.4 144.6 194.6 5.6 1.00 389.5 1.47 2 -3.4 136.3 186.3 5.6 1.01 367.3 1.39 WL1 3 石英 -2.8 135.4 185.4 4.6 1.00 361.0 1.36 4 -2.8 135.4 185.4 4.6 1.00 361.0 1.36 5 -2.6 133.0 183.0 4.3 0.99 353.1 1.33 1 -1.8 137.2 162.2 3.1 0.98 354.4 1.34 2 -1.7 135.5 160.5 2.9 0.97 348.2 1.31 3 -1.7 135.4 160.4 2.9 0.97 348.0 1.31 WL2 4 石英 -2.0 138.7 163.7 3.4 0.98 361.4 1.36 5 -1.2 130.5 155.5 2.1 0.97 323.1 1.22 6 -1.2 130.1 155.1 2.1 0.97 322.3 1.22 1 -2.4 155.7 210.7 4.0 0.98 411.0 1.55 2 -2.5 169.5 224.5 4.2 0.97 448.8 1.69 WL3 3 石英 -1.2 115.3 138.3 2.1 0.98 285.6 1.08 4 -1.2 114.0 137.0 2.1 0.98 282.4 1.07 5 -1.0 113.9 136.9 1.7 0.98 275.6 1.04 1 -2.0 135.5 160.5 3.4 0.98 353.0 1.33 2 -1.8 131.5 156.5 3.1 0.98 339.7 1.28 3 -1.8 131.5 156.5 3.1 0.98 339.7 1.28 WL4 4 石英 -1.5 130.4 155.4 2.6 0.97 331.1 1.25 5 -1.5 130.3 155.3 2.6 0.97 330.9 1.25 6 -1.3 130.1 155.1 2.2 0.97 325.3 1.23 表 2 石英闪长岩(WLBLK-2)和石英斑岩(WLBLK-3)LA-ICP-MS锆石U-Pb分析结果
Table 2. LA-ICP-MS zircon U-Pb data for the quartz diorite (WLBLK-2) and the quartz porphyry (WLBLK-3)
测试点 含量(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 206Pb/238U Pb Th U 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ WLBLK-2-01 52.93 437.13 522.87 0.84 0.055 0 0.000 8 0.539 7 0.008 0 0.070 6 0.000 4 0.021 0 0.000 3 440 3 WLBLK-2-02 36.73 311.34 348.12 0.89 0.056 1 0.000 9 0.557 9 0.009 2 0.071 5 0.000 5 0.021 2 0.000 3 445 3 WLBLK-2-03 44.36 361.58 441.44 0.82 0.057 5 0.000 9 0.563 1 0.008 6 0.070 7 0.000 5 0.021 1 0.000 3 440 3 WLBLK-2-04 26.93 192.03 290.94 0.66 0.057 5 0.001 1 0.575 1 0.010 0 0.072 2 0.000 5 0.021 3 0.000 3 450 3 WLBLK-2-05 55.11 462.76 537.19 0.86 0.055 9 0.000 9 0.555 9 0.008 5 0.071 6 0.000 5 0.021 3 0.000 3 446 3 WLBLK-2-06 113.17 1 087.73 967.23 1.12 0.055 8 0.000 8 0.556 0 0.008 0 0.071 7 0.000 5 0.021 9 0.000 3 446 3 WLBLK-2-07 53.77 479.74 540.83 0.89 0.056 9 0.000 9 0.541 4 0.008 8 0.068 4 0.000 5 0.020 4 0.000 3 427 3 WLBLK-2-08 34.57 286.25 353.75 0.81 0.058 2 0.001 0 0.561 0 0.009 8 0.069 4 0.000 5 0.021 2 0.000 3 432 3 WLBLK-2-09 20.59 117.24 199.95 0.59 0.075 0 0.001 6 0.767 4 0.015 8 0.073 8 0.000 6 0.030 6 0.000 6 459 3 WLBLK-2-10 66.13 575.20 633.08 0.91 0.056 5 0.000 8 0.558 4 0.007 6 0.071 3 0.000 4 0.021 5 0.000 3 444 3 WLBLK-2-11 90.13 689.54 911.77 0.76 0.058 5 0.000 8 0.577 3 0.007 9 0.071 2 0.000 5 0.023 8 0.000 3 443 3 WLBLK-2-12 83.15 774.59 755.11 1.03 0.057 0 0.000 8 0.556 7 0.008 2 0.070 3 0.000 5 0.021 6 0.000 3 438 3 WLBLK-2-13 9.21 42.13 109.67 0.38 0.064 0 0.001 6 0.656 9 0.016 0 0.074 5 0.000 7 0.025 7 0.000 6 459 4 WLBLK-2-14 16.34 122.02 171.89 0.71 0.057 4 0.001 4 0.566 7 0.013 5 0.071 7 0.000 6 0.022 2 0.000 4 447 3 WLBLK-2-15 81.12 781.73 749.04 1.04 0.055 9 0.000 7 0.537 6 0.007 4 0.069 5 0.000 4 0.020 7 0.000 3 433 3 WLBLK-2-16 44.63 347.71 467.74 0.74 0.056 6 0.000 9 0.555 3 0.009 0 0.070 9 0.000 4 0.021 7 0.000 3 442 3 WLBLK-2-17 46.09 356.96 508.70 0.70 0.055 6 0.000 9 0.531 1 0.008 2 0.069 1 0.000 4 0.021 4 0.000 3 431 3 WLBLK-2-18 40.81 333.74 415.98 0.80 0.057 6 0.000 9 0.556 1 0.008 5 0.069 9 0.000 4 0.021 8 0.000 3 435 3 WLBLK-2-19 9.73 54.34 116.06 0.47 0.061 1 0.001 5 0.599 2 0.014 0 0.071 6 0.000 6 0.024 6 0.000 6 446 4 WLBLK-2-20 25.32 202.88 247.16 0.82 0.058 0 0.001 1 0.572 1 0.010 7 0.071 7 0.000 5 0.022 9 0.000 3 446 3 WLBLK-3-01 6.01 37.08 88.58 0.42 0.050 8 0.001 7 0.469 2 0.016 1 0.067 2 0.000 7 0.016 0 0.000 5 419 4 WLBLK-3-02 9.76 72.40 135.89 0.53 0.053 6 0.001 6 0.487 4 0.013 7 0.066 3 0.000 6 0.014 9 0.000 3 414 4 WLBLK-3-03 5.79 32.51 83.29 0.39 0.053 2 0.001 7 0.491 1 0.014 5 0.067 6 0.000 6 0.015 5 0.000 5 422 4 WLBLK-3-04 4.60 23.42 61.40 0.38 0.058 2 0.002 3 0.563 7 0.021 1 0.071 7 0.000 8 0.020 1 0.000 7 447 5 WLBLK-3-05 12.21 83.69 176.08 0.48 0.049 2 0.001 2 0.450 3 0.010 6 0.066 3 0.000 5 0.015 3 0.000 3 414 3 WLBLK-3-06 4.50 25.32 62.18 0.41 0.057 7 0.002 3 0.532 3 0.019 8 0.068 1 0.000 9 0.018 9 0.000 7 425 5 WLBLK-3-07 7.24 45.50 104.15 0.44 0.053 5 0.001 5 0.500 5 0.013 8 0.068 0 0.000 6 0.015 4 0.000 4 424 4 WLBLK-3-08 5.04 29.66 70.81 0.42 0.052 8 0.002 0 0.492 1 0.017 1 0.068 4 0.000 8 0.015 9 0.000 5 427 5 WLBLK-3-09 11.93 97.18 148.18 0.66 0.051 6 0.001 4 0.479 6 0.012 0 0.067 7 0.000 6 0.016 6 0.000 3 422 4 WLBLK-3-10 5.38 31.34 68.18 0.46 0.052 9 0.002 1 0.518 0 0.019 8 0.072 4 0.000 8 0.017 2 0.000 6 450 5 WLBLK-3-11 4.57 27.73 66.07 0.42 0.056 1 0.002 2 0.499 4 0.018 1 0.066 3 0.000 8 0.016 8 0.000 5 414 5 WLBLK-3-12 4.37 26.98 58.82 0.46 0.058 3 0.002 5 0.534 4 0.021 2 0.068 5 0.000 8 0.017 1 0.000 5 427 5 WLBLK-3-13 6.74 40.37 91.57 0.44 0.055 2 0.001 9 0.510 3 0.016 3 0.068 0 0.000 7 0.017 6 0.000 5 424 4 WLBLK-3-14 4.97 31.69 66.11 0.48 0.057 3 0.002 4 0.522 8 0.020 1 0.068 1 0.000 7 0.017 1 0.000 5 425 4 WLBLK-3-15 3.71 12.23 39.70 0.31 0.091 8 0.003 9 0.872 5 0.035 6 0.070 7 0.001 0 0.037 3 0.001 3 425 6 WLBLK-3-16 6.63 43.74 84.44 0.52 0.057 7 0.001 9 0.530 5 0.016 7 0.067 5 0.000 7 0.018 1 0.000 5 421 4 WLBLK-3-17 10.48 74.61 136.93 0.54 0.052 4 0.001 6 0.475 6 0.014 5 0.066 1 0.000 6 0.017 1 0.000 4 413 3 WLBLK-3-18 8.40 64.09 111.42 0.58 0.051 9 0.001 7 0.463 6 0.014 5 0.065 2 0.000 6 0.015 9 0.000 4 407 4 WLBLK-3-19 5.15 27.55 72.49 0.38 0.054 7 0.002 0 0.516 4 0.018 7 0.068 9 0.000 7 0.017 8 0.000 5 430 4 WLBLK-3-20 3.79 19.54 51.71 0.38 0.057 3 0.002 3 0.523 3 0.019 8 0.068 0 0.000 9 0.018 2 0.000 7 424 5 -
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