Re-Os Isotopic Dating of Pyrrhotite from Yueyawan Cu-Ni Sulfide Deposit in Kalatage Area of East Tianshan Mountain and Its Geological Significance
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摘要: 新疆哈密月牙湾铜镍矿是近年来在东天山卡拉塔格地区新发现的岩浆型铜镍硫化物矿床.为确定该矿床的成岩、成矿时代及其成矿作用，利用锆石LA-ICP-MS U-Pb定年和硫化物Re-Os同位素等时线定年方法，分别对主含矿岩相橄榄辉长岩和矿石中的磁黄铁矿进行了年龄测定.橄榄辉长岩中锆石的206Pb/238U年龄为255~292 Ma，加权平均值为274±2.4 Ma，代表了橄榄辉长岩的成岩年龄；矿石中磁黄铁矿Re-Os同位素等时线年龄为271.9±9.5 Ma，代表了硫化物熔离成矿的年龄；187Os/188Os初始值为0.279 6±0.008 9，γOs值为117~126，指示在岩浆侵位及硫化物熔离成矿过程中有地壳物质加入.月牙湾镁铁质岩浆的成岩、成矿作用发生于早二叠世，与东天山黄山-图拉尔根一带典型铜镍硫化物矿床为同一时期的产物.Abstract: The Yueyawan Cu-Ni deposit is a newly discovered magmatic Cu-Ni sulfide deposit in Kalatage area of East Tianshan Mountain. In order to restrict the metallogenic age of the Yueyawan Cu-Ni deposit, LA-ICP-MS U-Pb and Re-Os isotopic dating had been conducted for zircons and pyrrhotite from the ore-forming olivine gabbro, respectively. The 206Pb/238U ages of zircons range from 255 Ma to 292 Ma, and yield an average weighted age of 274±2.4 Ma, which represents the diagenetic age of olivine gabbro. The isochron age of the Re-Os isotopic dating of pyrrhotite is 271.9±9.5 Ma, which represents the age of Cu-Ni mineralization. The initial 187Os/188Os ratio is 0.279 6±0.008 9, and γOs value is 117-126, indicating that crustal materials had been involved into the sulfide mineralization. The diagenesis and metallogenesis of mafic magma in Yueyawan occurred in Early Permian, contemporary with the typical Cu-Ni sulfide deposits in Huangshan-Tulaergen area of East Tianshan Mountain.
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Key words:
- mafic complex /
- Re-Os isotopic dating /
- Cu-Ni sulfide deposit /
- Yueyawan /
- East Tianshan Mountain /
- mineral deposits
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图 1 东天山构造格架与矿床分布情况（a，据王京彬等，2006）与卡拉塔格隆起地质矿产分布情况（b，据吕晓强等，2019）
Fig. 1. Map of the tectonic framework and deposit distribution in the East Tianshan Mountain (a, modified after Wang et al., 2006) and geological map of the Kalatage area (b, modified after Lü et al., 2019)
图 2 月牙湾铜镍矿区地质简图（a）与勘探线剖面（b）
Fig. 2. Geological map (a) and representative cross section (b) of theYueyawan Cu-Ni deposit
图 3 月牙湾铜镍矿岩体地貌、典型岩矿石特征
a.月牙湾铜镍矿地貌特征；b.橄榄辉长岩；c.浸染状矿石；d.块状矿石；e.磁黄铁矿(Po)、镍黄铁矿(Pn)、黄铜矿(Cp)共生；f.磁黄铁矿中出溶叶片状镍黄铁矿
Fig. 3. Representative photographs and photomicrographs of the Cu-Ni-mineralized gabbroic complex in the Yueyawan deposit
图 4 月牙湾镁铁质杂岩体橄榄辉长岩锆石阴极发光照片(a)和LA⁃ICP⁃MS年龄谐和图(b)
Fig. 4. CL images of zircon grains (a) and LA⁃ICP⁃MS zircon U⁃Pb concordia diagrams (b) for the mafic olivine gabbroic complex in the Yueyawan deposit
图 5 月牙湾铜镍硫化物矿石Re⁃Os同位素等时线图
Fig. 5. Re⁃Os isochron of the Cu-Ni sulfide ores in the Yueyawan deposit
图 6 新疆月牙湾铜镍硫化物矿床磁黄铁矿Re/Os-普通Os图
Fig. 6. Re/Os vs. common Os diagram of the pyrrhotite in the Yueyawan Cu-Ni sulfide deposit, Xinjiang
表 1 月牙湾镁铁质杂岩体橄榄辉长岩LA⁃ICP⁃MS锆石U⁃Pb定年结果
Table 1. LA⁃ICP⁃MS zircon U⁃Pb dating results of the olivine gabbro from Yueyawan complex, eastern Tianshan
点号 含量(10-6) 同位素比值 年龄(Ma) Pb Th U 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ Y-1-2_1 42.87 216.47 255.86 0.053 4 0.001 4 0.311 7 0.008 5 0.043 5 0.000 5 346 57 276 7 274 3 Y-1-2_2 122.98 510.31 732.78 0.051 8 0.000 7 0.311 8 0.004 3 0.043 6 0.000 4 276 32 276 3 275 2 Y-1-2_3 19.19 88.82 115.40 0.054 4 0.002 6 0.315 4 0.016 0 0.043 2 0.000 7 388 101 278 12 273 4 Y-1-2_4 60.24 385.57 357.11 0.054 4 0.001 2 0.314 9 0.007 4 0.043 8 0.000 5 387 49 278 6 276 3 Y-1-2_5 29.78 186.24 175.67 0.051 5 0.001 4 0.313 9 0.009 0 0.044 1 0.000 5 264 61 277 7 278 3 Y-1-2_6 19.23 109.64 112.77 0.051 7 0.001 4 0.316 3 0.009 2 0.044 3 0.000 5 273 62 279 7 280 3 Y-1-2_7 53.68 374.01 301.12 0.052 1 0.001 4 0.336 6 0.010 0 0.046 4 0.000 5 289 62 295 8 292 3 Y-1-2_8 58.78 308.33 378.37 0.051 9 0.001 4 0.296 4 0.008 3 0.040 4 0.000 5 281 59 264 7 255 3 Y-1-2_9 63.70 243.19 398.06 0.057 7 0.003 6 0.298 4 0.020 5 0.041 6 0.000 9 518 133 265 16 263 6 Y-1-2_10 72.55 520.74 431.85 0.051 6 0.001 1 0.313 4 0.006 8 0.043 7 0.000 4 266 47 277 5 276 3 Y-1-2_11 22.13 153.80 138.66 0.054 8 0.003 3 0.297 0 0.019 3 0.041 6 0.000 9 405 128 264 15 263 5 Y-1-2_12 21.52 130.57 126.89 0.049 6 0.001 4 0.314 1 0.009 2 0.044 2 0.000 5 177 63 277 7 279 3 Y-1-2_13 38.94 238.16 234.88 0.051 8 0.001 3 0.310 4 0.008 3 0.043 2 0.000 5 275 56 275 6 273 3 Y-1-2_14 40.01 321.15 244.86 0.052 3 0.001 0 0.301 9 0.006 2 0.042 6 0.000 4 298 45 268 5 269 3 Y-1-2_15 29.61 144.95 185.13 0.052 5 0.002 0 0.303 9 0.012 6 0.041 7 0.000 6 307 85 269 10 264 4 Y-1-2_16 86.17 335.05 513.13 0.050 6 0.000 8 0.310 9 0.005 2 0.043 8 0.000 4 222 37 275 4 277 3 Y-1-2_17 60.28 419.27 361.24 0.052 5 0.001 1 0.312 6 0.006 8 0.043 6 0.000 4 306 46 276 5 275 3 Y-1-2_18 20.09 96.47 125.25 0.052 4 0.001 6 0.293 5 0.009 6 0.041 9 0.000 5 305 69 261 8 265 3 Y-1-2_19 19.88 124.45 118.21 0.052 4 0.002 2 0.317 3 0.014 6 0.044 0 0.000 7 304 94 280 11 277 4 Y-1-2_20 44.29 294.05 263.44 0.053 4 0.001 3 0.317 4 0.007 9 0.044 0 0.000 5 346 52 280 6 277 3 
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表 2 月牙湾铜镍硫化物矿床磁黄铁矿Re⁃Os同位素分析结果
Table 2. Re⁃Os isotopic data of pyrrohtite from the Yueyawan Cu-Ni deposit
样号 采样位置 矿石类型 样品重量(g) 含量(10-9) 187Re/188Os 187Os/188Os Re/普Os (187Os/188Os)i γOs Re 2σ 普Os 2σ 187Re 2σ 187Os 2σ 测定值 不确定度 测定值 不确定度 H158-1 ZKY401，165 m 细脉状 0.25012 58.53 0.43 8.92 0.10 36.79 0.27 0.49 0.00 34.2632 0.376 5 0.438 2 0.001 0 6.56 0.282 6 125 H158-2 ZKY401，165 m 细脉状 0.25048 45.66 0.34 4.16 0.04 28.70 0.21 0.28 0.00 54.6660 0.620 1 0.533 0 0.001 8 10.97 0.284 8 126 H182-2 ZKY401，188 m 细脉状 0.25018 54.68 0.40 5.48 0.04 34.37 0.25 0.36 0.00 47.6811 0.491 3 0.500 7 0.000 9 9.98 0.284 3 126 H162 ZKY401，170 m 稀疏浸染状 0.25024 10.92 0.08 0.77 0.01 6.86 0.05 0.06 0.00 68.7100 0.698 2 0.592 9 0.001 3 14.17 0.281 0 123 H1801-4 ZKY402，150 m 稠密浸染状 0.20065 33.74 0.25 1.47 0.01 18.77 0.14 0.15 0.00 110.6262 1.124 5 0.775 3 0.001 4 22.90 0.273 1 117 H1801-3 ZKY402，380 m 块状 0.20121 131.61 0.97 61.66 0.52 82.73 0.61 2.57 0.02 10.3095 0.110 6 0.321 1 0.000 6 2.13 0.274 3 118 H1801-1 ZKY402，380 m 块状 0.20056 142.77 1.06 66.70 0.58 89.75 0.66 2.81 0.02 10.3384 0.113 8 0.323 9 0.000 5 2.14 0.277 0 120
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表 3 东天山镁铁质-超镁铁质岩体成岩成矿年龄数据
Table 3. The dating results of Cu-Ni sulfide deposits and related ultramafic-mafic intrusions in eastern Tianshan area
构造带 岩体/矿床 研究对象 测试方法 年龄(Ma) 参考文献 年龄 误差(σ) 东天山康古尔构造混杂岩带 图拉尔根 辉长岩 锆石SHRIMP U⁃Pb 300.5 3.2 三金柱等, 2010 黄山 辉长岩 锆石SIMS U⁃Pb 283.8 3.4 Qin et al., 2011 黄山东 硫化物矿石 Re⁃Os 282 20 毛景文等, 2002 香山 镍黄铁矿 Re⁃Os 298 7.1 李月臣等, 2006 白鑫滩 辉石橄榄岩 锆石LA⁃ICP⁃MS U⁃Pb 277.9 2.6 王亚磊等, 2015 白鑫滩 橄榄辉长岩 锆石LA⁃ICP⁃MS U⁃Pb 287.3 3.1 赵冰冰等, 2018 东天山大南湖岛弧带 卡拉塔格月牙湾 橄长岩 锆石LA⁃ICP⁃MS U⁃Pb 281.3 2.0 Sun et al., 2019 橄榄辉长岩 锆石LA⁃ICP⁃MS U⁃Pb 274 2.4 本文 磁黄铁矿 Re⁃Os 271.9 9.5 本文
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