Characteristics of zircon U-Pb-Hf isotopes for the Gartasksitao porphyritic rocks and constraints on ridge subduction, Xinjiang
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摘要:
新疆加尔塔斯克斯套斑岩铜矿床位于西准噶尔斑岩成矿带西段, 目前研究程度很低。对该矿床花岗闪长斑岩体进行LA-ICP-MS锆石U-Pb年龄、岩石地球化学及Hf同位素组成测试分析。结果显示, 该岩体的锆石U-Pb年龄为299.2 ± 5.3 Ma, 形成于晚石炭世末—早二叠世初; 岩石具有富SiO2、Al2O3、Na, 贫K, Mg#值较高, 以及高Sr、低Y和Yb含量的特点, 显示埃达克岩特征; 富集大离子亲石元素Cs、Ba、U和轻稀土元素, 亏损高场强元素Ti、Nb、Ta和重稀土元素, 无明显Eu异常。斑岩具有高的176 Hf/ 177 Hf值, 正高εHf (t)值(+10.1~+15.6, 平均+12.8), 以及年轻的两阶段模式年龄(TDM2=307.4~687.1 Ma), 显示亏损地幔源区属性, 鲜有壳源混染。研究认为, 该斑岩体可能形成于洋脊俯冲, 并伴有明显的Cu、Au矿化, 指示该斑岩铜矿床有良好的找矿潜力。
Abstract:The Gartasksitao porphyry copper deposit is located in the western part of the porphyry metallogenic belt in West Junggar.The LA-ICP-MS zircon U-Pb age, geochemistry, and Hf isotopic compositions of the granodiorite porphyry for this deposit have been analyzed.The results show that the zircon U-Pb age of the granodiorite porphyry is 299.2 ± 5.3 Ma, formed between the Late Carboniferous and the Early Permian.The samples have high SiO2, Al2O3, Na2O, and low K2O, high Mg# and Sr, low Y, Yb, indicating affinity with the adakitic feature.Trace elements are characterized by enrichment of Cs-Ba-U LILEs and LREEs, depletion of in Ti-Nb-Ta and HREEs, and rarely Eu anomaly.The 176Hf/ 177Hf ratios are high, with positive εHf (t) values (+10.1~+15.6, Avg.+12.8) and young TDM2 (307.4 ~ 687.1 Ma), indicating that the granodiorite porphyry was derived from a depleted mantle source.It could be suggested that the porphyry was formed by the oceanic ridge subduction, accompanied by considerable Cu and Au mineralization, which indicates that the Gartasksitao porphyry copper deposit has promising prospecting potential.
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Key words:
- West Junggar /
- porphyry copper deposit /
- zircon U-Pb dating /
- Hf isotope /
- geochemistry /
- Gartasksitao
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表 1 加尔塔斯克斯套1号岩体ZK1见矿情况
Table 1. Ore occurrences of ZK1 in Gartasksitao No.1 stock
矿(化) 体 截断深度/m 视厚度/m 样品 平均品位Cu/% 备注 Ⅰ 17.00~22.00 5.00 8-10H 0.34 铜贫矿体 Ⅱ 34.00~35.20 1.20 17H 0.30 铜贫矿体 Ⅰ 40.00~45.00 5.00 21-23H 0.41 铜矿体 Ⅳ 101.23~102.83 1.60 32-34H 0.67 铜矿体 Ⅴ 177.00~181.00 4.00 100-101H Au~0.5 g/t 金矿(化)体 
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表 2 标准锆石176Lu/177Hf同位素组成及范围
Table 2. Hf isotopic compositions and ranges of 176Lu/177Hf for standard zircons
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表 3 加尔塔斯克斯套1号岩体花岗闪长斑岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 3. LA-ICP-MS zircon U-Th-Pb dating of granodiorite porphyry in Gartasksitao No.1 stock
测点 232Th
/10-6238U
/10-6Pb*
/10-6Th/
U同位素比值 年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ zk1-79-1 154.29 234.80 13.93 0.66 0.0511 0.0044 0.3246 0.0356 0.0460 0.0017 247 183 285 27 290 7 zk1-79-2 350.81 236.25 16.67 1.48 0.0570 0.0029 0.3550 0.0195 0.0452 0.0014 492 107 308 15 285 6 zk1-79-3 74.27 90.50 6.26 0.82 0.0500 0.0031 0.3615 0.0236 0.0525 0.0017 193 138 313 18 330 8 zk1-79-4 105.76 111.39 7.75 0.95 0.0532 0.0028 0.3711 0.0215 0.0506 0.0017 336 121 320 16 318 7 zk1-79-5 138.39 147.80 9.78 0.94 0.0636 0.0031 0.4181 0.0227 0.0477 0.0015 729 103 355 16 300 6 zk1-79-6 89.90 106.70 6.64 0.84 0.0557 0.0059 0.3387 0.0425 0.0441 0.0015 441 231 296 32 278 6 zk1-79-7 306.56 254.36 17.87 1.21 0.0535 0.0024 0.3639 0.0183 0.0493 0.0015 351 102 315 14 310 6 zk1-79-8 315.46 228.40 14.86 1.38 0.0547 0.0025 0.3288 0.0170 0.0436 0.0014 402 99 289 13 275 5 zk1-79-9 48.40 57.64 3.62 0.84 0.0522 0.0059 0.3158 0.0424 0.0439 0.0017 296 233 279 33 277 7 zk1-79-10 352.87 300.69 22.16 1.17 0.0545 0.0024 0.3915 0.0193 0.0521 0.0016 393 94 335 14 327 7 zk1-79-11 77.23 92.39 6.00 0.84 0.0642 0.0041 0.4378 0.0297 0.0495 0.0017 747 137 369 21 312 7 zk1-79-12 39.78 49.48 3.99 0.80 0.0646 0.0103 0.4707 0.0851 0.0528 0.0023 762 346 392 59 332 11 zk1-79-13 135.10 284.69 15.78 0.47 0.0576 0.0024 0.3647 0.0177 0.0459 0.0014 515 93 316 13 289 6 zk1-79-14 73.43 83.44 5.15 0.88 0.0542 0.0037 0.3443 0.0239 0.0461 0.0015 379 157 300 18 291 6 zk1-79-15 286.21 243.07 15.80 1.18 0.0585 0.0031 0.3618 0.0206 0.0449 0.0014 549 117 314 15 283 6 zk1-79-16 98.18 115.90 6.71 0.85 0.0494 0.0032 0.3044 0.0204 0.0447 0.0015 167 148 270 16 282 6 zk1-79-17 501.19 460.66 26.94 1.09 0.0517 0.0022 0.3063 0.0145 0.0430 0.0013 272 98 271 11 271 5 zk1-79-18 115.95 126.51 7.62 0.92 0.0483 0.0030 0.3056 0.0195 0.0459 0.0015 114 140 271 15 289 6 zk1-79-19 73.94 96.27 5.34 0.77 0.0555 0.0033 0.3357 0.0209 0.0439 0.0014 433 137 294 16 277 6 zk1-79-20 367.46 382.01 22.06 0.96 0.0535 0.0025 0.3311 0.0172 0.0449 0.0014 350 109 290 13 283 6 zk1-79-21 114.93 130.00 9.33 0.88 0.0520 0.0062 0.3548 0.0491 0.0495 0.0018 284 251 308 37 312 8 zk1-79-22 412.38 295.30 20.54 1.40 0.0539 0.0025 0.3551 0.0182 0.0478 0.0015 365 99 309 14 301 6 zk1-79-23 136.94 140.66 8.38 0.97 0.0572 0.0039 0.3597 0.0240 0.0456 0.0015 501 141 312 18 287 6 zk1-79-24 139.94 136.90 9.31 1.02 0.0521 0.0034 0.3737 0.0252 0.0520 0.0017 291 142 322 19 327 7 zk1-79-25 362.63 305.22 20.16 1.19 0.0559 0.0026 0.3534 0.0183 0.0459 0.0014 447 98 307 14 289 6 zk1-79-26 181.90 199.39 12.03 0.91 0.0551 0.0028 0.3513 0.0198 0.0463 0.0015 416 109 306 15 292 6 zk1-79-27 259.86 222.29 14.50 1.17 0.0603 0.0031 0.4001 0.0225 0.0482 0.0015 613 102 342 16 303 6 zk1-79-28 639.24 387.11 29.42 1.65 0.0543 0.0024 0.3730 0.0184 0.0499 0.0015 383 91 322 14 314 6 zk1-79-29 157.93 202.59 12.39 0.78 0.0570 0.0030 0.3846 0.0216 0.0490 0.0015 491 104 330 16 308 6 zk1-79-30 267.46 199.28 15.12 1.34 0.0500 0.0028 0.3741 0.0221 0.0543 0.0017 194 113 323 16 341 7 zk1-79-31 85.66 85.22 5.30 1.01 0.0441 0.0041 0.2973 0.0276 0.0489 0.0017 -66 169 264 22 308 7 zk1-79-32 117.56 148.87 9.11 0.79 0.0557 0.0032 0.3913 0.0249 0.0510 0.0017 438 120 335 18 321 7 zk1-79-33 939.48 628.97 47.68 1.49 0.0511 0.0022 0.3653 0.0174 0.0519 0.0015 245 93 316 13 326 6 zk1-79-34 551.04 329.23 24.02 1.67 0.0654 0.0036 0.4278 0.0258 0.0475 0.0015 787 111 362 18 299 6
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表 4 加尔塔斯克斯套斑岩主量和微量元素含量
Table 4. Major and trace element concentrations of the Gartasksitao porphyry
样品号 ZK1-15 ZK1-34 ZK1-37 ZK1-56 ZK1-79 ZK1-126 ZK1-143 岩性 花岗斑岩 花岗闪长斑岩 花岗闪长斑岩 花岗闪长斑岩 花岗闪长斑岩 花岗闪长斑岩 花岗闪长斑岩 SiO2 70.8 63.4 62.7 65.1 66.2 66.4 65.6 TiO2 0.5 0.6 0.7 0.7 0.7 0.6 0.7 Al2O3 13.8 15.7 15.5 15.3 15.1 14.6 14.5 Fe2O3 2.9 4.6 4.8 4.6 4.3 3.9 4.7 MgO 1.9 3.3 3.2 2.2 2.7 2.3 2.2 MnO 0.02 0.03 0.02 0.02 0.02 0.02 0.02 CaO 3.7 4.8 5.2 3.8 3.7 3.1 2.9 Na2O 3.9 4.5 4.7 4.2 4.3 4.2 4.3 K2O 0.8 1.4 1.3 2.4 1.8 2.2 2.5 P2O5 0.1 0.2 0.2 0.1 0.1 0.2 0.2 烧失量 1.8 1.8 1.6 1.5 1.6 1.5 1.6 总计 100.2 100.3 99.9 99.9 100.5 99.0 99.2 K2O/Na2O 0.2 0.3 0.3 0.6 0.4 0.5 0.6 Mg# 54.1 56.4 54.5 46.3 53.1 51.5 45.7 A/CNK 1.0 0.9 0.8 0.9 1.0 1.0 1.0 A/NK 1.9 1.8 1.7 1.6 1.7 1.6 1.5 CIA 49.6 47.1 45.4 48.2 48.9 49.4 49.0 K2O+Na2O 4.7 5.9 6.0 6.6 6.1 6.4 6.8 Li 8.1 9.3 8.6 12.7 13.6 12.4 10.7 Be 1.3 0.8 1.2 0.8 1.1 1.3 1.2 Sc 9.6 13.6 11.7 11.2 11.2 10.3 11.2 V 63.5 114.6 128.3 100.4 118.6 107.6 114.4 Cr 46.8 67.3 74.2 31.6 63.4 40.8 46.5 Ni 36.9 47.4 41.6 24.1 29.8 21.0 42.1 Cu 402.3 289.1 284.6 48.9 354.6 312.1 486.9 Zn 27.4 31.7 31.8 31.4 41.8 33.8 71.8 Ga 18.4 18.9 19.6 17.4 19.3 20.3 20.4 Rb 42.6 63.1 44.2 79.2 52.7 82.7 75.6 Sr 440.1 578.3 677.4 453.6 589.6 456.2 512.4 Y 4.8 12.8 14.6 11.0 14.2 13.6 13.0 Zr 110.7 105.8 86.9 129.5 115.3 139.6 82.7 Nb 3.6 4.2 3.3 4.2 4.2 4.5 4.3 Cs 1.8 2.4 2.7 2.3 2.6 3.2 2.8 Ba 187.6 273.4 386.7 634.1 634.1 492.1 502.7 La 6.3 9.6 12.4 12.8 12.3 13.6 7.9 Ce 15.9 22.4 24.8 25.3 27.6 31.7 20.3 Pr 1.6 2.6 3.3 3.2 3.5 3.6 2.5 Nd 7.3 13.9 14.4 12.3 12.8 13.4 11.2 Sm 1.3 2.8 3.0 2.5 2.6 2.8 2.3 Eu 0.5 0.9 0.9 0.7 0.8 0.7 0.6 Gd 1.1 2.7 3.1 2.6 2.6 2.8 2.5 Tb 0.2 0.5 0.5 0.4 0.4 0.5 0.4 Dy 1.4 2.3 2.6 2.2 2.3 2.6 2.2 Ho 0.3 0.4 0.6 0.5 0.4 0.5 0.4 Er 0.8 1.4 1.5 1.4 1.5 1.4 1.5 Tm 0.1 0.2 0.2 0.2 0.2 0.2 0.2 Yb 0.7 1.4 1.5 1.4 1.3 1.4 1.3 Lu 0.1 0.2 0.2 0.2 0.2 0.2 0.2 Hf 3.5 3.3 2.8 3.5 3.2 3.9 2.8 Ta 0.4 0.3 0.4 0.3 0.4 0.3 0.4 Pb 3.6 3.3 2.9 3.4 4.4 4.3 3.6 Th 7.4 4.2 3.8 5.2 5.3 5.4 5.6 U 1.3 1.2 1.5 1.7 1.8 1.6 1.8 Sr/Y 91.7 45.2 46.4 41.2 41.5 33.5 39.4 ∑REE 42.4 74.1 83.6 76.7 82.7 89.0 66.5 LREE 32.9 52.2 58.8 56.8 59.6 65.8 44.8 HREE 9.5 21.9 24.8 19.9 23.1 23.2 21.7 LREE/HREE 3.5 2.4 2.4 2.9 2.6 2.8 2.1 (La/Yb)N 6.5 4.9 5.9 6.6 6.8 7.0 4.4 Eu/Eu* 1.3 1.0 0.9 0.8 0.9 0.8 0.8 注：主量元素含量单位为%, 微量和稀土元素含量单位为10-6
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表 5 加尔塔斯克斯套斑岩矿床样品Hf同位素组成
Table 5. Hf isotopic composition of samples from the Gartasksitao porphyry deposit
样品号 岩性 T/Ma 176Lu/177Hf 2σ 176Hf/177Hf 2SE εHf(t) 2σ TDM1
/MaTDM2
/MaZK1-79-1 花岗闪长斑岩 290 0.001001 0.000065 0.283039 0.000025 15.6 1.0 300.9 307 ZK1-79-2 310 0.002142 0.000041 0.282970 0.000023 13.4 0.9 412.5 468 ZK1-79-3 291 0.001039 0.000094 0.282980 0.000023 13.6 0.9 385.4 441 ZK1-79-4 283 0.001672 0.000096 0.282944 0.000021 12.0 0.8 444.8 536 ZK1-79-5 271 0.002706 0.000141 0.282950 0.000026 11.8 1.0 448.5 541 ZK1-79-6 289 0.001529 0.000059 0.282940 0.000026 12.0 1.0 447.8 538 ZK1-79-7 277 0.000919 0.000020 0.282976 0.000027 13.1 1.0 390.7 458 ZK1-79-8 312 0.001093 0.000100 0.282974 0.000024 13.8 1.0 395.0 444 ZK1-79-9 301 0.002720 0.000077 0.282911 0.000027 11.0 1.0 506.7 613 ZK1-79-10 327 0.001138 0.000071 0.282923 0.000023 12.3 0.9 468.4 551 ZK1-79-11 303 0.001678 0.000017 0.282946 0.000027 12.5 1.0 441.5 519 ZK1-79-12 298 0.001771 0.000029 0.282962 0.000021 12.9 0.9 419.7 488 ZK1-79-13 314 0.002717 0.000113 0.282899 0.000023 10.8 0.9 524.4 633 ZK1-79-14 308 0.001203 0.000033 0.282989 0.000026 14.2 1.0 374.5 413 ZK1-79-15 321 0.000740 0.000014 0.283016 0.000024 15.5 1.0 331.5 338 ZK1-79-16 326 0.002321 0.000034 0.282870 0.000021 10.1 0.8 561.2 687 ZK1-79-17 298 0.001937 0.000062 0.282960 0.000026 12.8 1.0 424.9 495 注：εHf(t)=((176Hf/177Hf)S(t)/(176Hf/177Hf)CHUR(t)-1)×10000;TDM1=(1/λ)×(1+((176Hf/177Hf)S-(176Lu/177Hf)DM)/((176Lu/177Hf)S-(176Lu/177Hf)DM)); TDM2=TDM1-((TDM1-t)×(fCC-fS)/ (fCC-fDM)); fS= (176Lu/177Hf)S/(176Lu/177Hf)CHUR -1, fCC= -0.5482, fDM= 0.157; l= 1.867×10-11 a-1; (176Lu/177Hf) DM = 0.038, (176Hf/177Hf)DM = 0.28325;t= 3 Ma
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