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东昆仑西段卧龙岗花岗斑岩岩石地球化学特征和锆石U-Pb年龄——对可可西里-松潘-甘孜地块构造环境及区域锑成矿时代的限定

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周玉, 龚大兴, 周雄, 周家云, 岳相元. 东昆仑西段卧龙岗花岗斑岩岩石地球化学特征和锆石U-Pb年龄——对可可西里-松潘-甘孜地块构造环境及区域锑成矿时代的限定[J]. 地质通报, 2018, 37(10): 1853-1865.
引用本文: 周玉, 龚大兴, 周雄, 周家云, 岳相元. 东昆仑西段卧龙岗花岗斑岩岩石地球化学特征和锆石U-Pb年龄——对可可西里-松潘-甘孜地块构造环境及区域锑成矿时代的限定[J]. 地质通报, 2018, 37(10): 1853-1865.
shu
ZHOU Yu, GONG Daxing, ZHOU Xiong, ZHOU Jiayun, YUE Xiangyuan. Petrogeochemistry and zircon geochronology of the Wolonggang granite porphyry in the western segment of the East Kunlun: Implications for tectonic setting of the Hoh Xil-Songpan-Ganzi Block and regional antimony mineralization timing[J]. Geological Bulletin of China, 2018, 37(10): 1853-1865.
Citation: ZHOU Yu, GONG Daxing, ZHOU Xiong, ZHOU Jiayun, YUE Xiangyuan. Petrogeochemistry and zircon geochronology of the Wolonggang granite porphyry in the western segment of the East Kunlun: Implications for tectonic setting of the Hoh Xil-Songpan-Ganzi Block and regional antimony mineralization timing[J]. Geological Bulletin of China, 2018, 37(10): 1853-1865.
shu

东昆仑西段卧龙岗花岗斑岩岩石地球化学特征和锆石U-Pb年龄——对可可西里-松潘-甘孜地块构造环境及区域锑成矿时代的限定

  • 中国地质科学院矿产综合利用研究所, 四川 成都 610041

  • 基金项目:
    国家自然科学基金项目《电气石对斑岩矿床岩浆-热液演化的示踪——以西藏甲玛矿床为例》（批准号：41602072）、中国地质调查局项目《新疆回风口地区矿产地质调查》（编号：12120113046000）和西藏自治区矿产资源勘查专项《西藏重点含锂地热活动区锂资源调查评价》（编号：藏矿勘[2018]09号）
详细信息
    作者简介: 周玉(1984-), 男, 博士, 矿床学专业。E-mail:zhouyu46@163.com

  • 中图分类号: P597+.3;P618.66

Petrogeochemistry and zircon geochronology of the Wolonggang granite porphyry in the western segment of the East Kunlun: Implications for tectonic setting of the Hoh Xil-Songpan-Ganzi Block and regional antimony mineralization timing

  • Chinese Academy of Geological Sciences, Institute of Multipurpose Utilization of Mineral Resources, Chengdu 610041, Sichuan, China

    摘要

  • 为了解可可西里-松潘-甘孜地块西北缘的构造演化及侵入岩与区域浅成低温热液矿床成矿的关系，在野外地质调查的基础上，采集了东昆仑西段的卧龙岗岩体花岗斑岩样品，对其中的12件和2件样品分别进行了岩石地球化学及LA-ICP-MS锆石U-Pb年龄测定。结果表明，花岗斑岩SiO2含量为64.96%~71.24%，高钾、富钠、贫钙。AR值为1.97~2.95，A/CNK值为0.98~1.16，为高钾钙碱性系列。岩石相对富集Cs、Rb、Ba、U和Nd，亏损Zr、Hf、Sr、Ti和Y。稀土元素总量为151×10-6~239×10-6，LREE/HREE值为8.10~14.53，δEu为0.54~0.70，具有明显的负Eu异常。锆石206Pb/238U年龄分别为205.6±1.6Ma和204.7±2.6Ma，表明卧龙岗岩体形成于晚三叠世末期。综合分析认为，可可西里-松潘-甘孜地块西北缘在晚三叠世末期应处于后碰撞伸展构造背景，区域浅成低温热液矿床形成时代晚于晚三叠世末期。

    The 12 petrogeochemistry and 2 zircons LA-ICP-MS U-Pb age tests were carried out on the basis of field investigation for the granite porphyry samples of the Wolongang pluton in the western part of the East Kunlun in order to understand the tectonic evolution of the northwestern margin of the Hoh Xil-Songpan-Ganzi block and the relationship between the intrusive rocks and the regional shallow metamorphic hydrothermal deposits. The results show that the content of SiO2 in granite porphyry is 64.96%~71.24%, they were high potassium, sodium rich and poor calcium. Their AR values were 1.97~2.95 and A/CNK were 0.98~1.16, which were high potassium calcareous alkaline series. The rocks are relatively enriched with Cs, Rb, Ba, U and Nd and are depleted of Zr, Hf, Sr, Ti and Y. The total amount of REE is 151×10-6~239×10-6, LREE/HREE is 8.10~14.53 and δEu is 0.54~0.70, which has obvious negative europium anomaly. The results of zircon 206Pb/238U dating were 205.6±1.6Ma (MSWD=0.34, n=17) and 204.7 ±2.6Ma (MSWD=2.0, n=16), indicating that the Wolonggang pluton formation was at the end of the Late Triassic. According to the comprehensive analysis, it is concluded that the northwestern margin of the Hoh Xil-Songpan-Ganzi block should be in the extensional post-collision tectonic setting at the end of the Late Triassic, and the formation time of the regional shallow metamorphic hydrothermal deposits is later than the end of late Triassic.

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  • 图 1  研究区大地构造位置图（A）（底图据参考文献[1]修改，年龄数据据参考文献[2-6]）、区域构造简图①（B）及卧龙岗岩体地质简图②（C）

    Figure 1. 

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    图 图版Ⅰ   

    Figure 图版Ⅰ. 

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    图 2  花岗斑岩SiO2-K2O[33]（A）和TAS分类图解[34]（B）

    Figure 2. 

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    图 3  花岗岩类lgAR-SiO2（A）和Shand指数图解（B）

    Figure 3. 

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    图 4  卧龙岗花岗斑岩微量元素蛛网图（A，原始地幔标准化值据参考文献[36]）和稀土元素配分型式图（B，球粒陨石标准化值据参考文献[37]）

    Figure 4. 

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    图 5  卧龙岗岩体WLG01（A）、WLG03（B）花岗斑岩样品锆石阴极发光图像、U-Pb谐和图和均值图

    Figure 5. 

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    图 6  花岗岩构造环境图解（底图据参考文献[50-51]）

    Figure 6. 

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    图 7  花岗岩R1-R2构造环境判别图解（底图据参考文献[52]）

    Figure 7. 

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    图 8  卧龙岗岩体一带构造剖面图③

    Figure 8. 

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    表 1  卧龙岗花岗斑岩元素地球化学分析结果

    Table 1.  The result of the elemental geochemical analysis for the Wolonggang granite porphyry

    样品号 WLG01 D3048-1 D3048-2 D3062 WLG02 D3103-1 WLG03 D3047-1 D3047-2 D3047-3 D3047-4 D3047-5
    SiO2 67.39 71.01 69.97 68.76 68.33 71.24 69.62 69.43 70.60 70.98 64.96 68.5
    Al2O3 15.64 14.02 15.10 15.10 14.96 14.58 14.84 15.19 14.62 14.50 15.98 15.29
    Fe2O3 0.28 0.21 0.55 0.29 1.26 0.26 0.31 0.27 0.02 0.30 0.16 0.40
    FeO 2.05 2.13 1.68 2.15 1.08 1.94 1.82 2.09 2.28 2.09 3.65 1.94
    CaO 2.68 1.73 2.22 1.74 2.79 1.62 2.13 1.77 1.92 1.69 3.56 2.28
    MgO 0.97 0.87 0.72 0.82 0.52 0.70 0.65 0.81 0.74 0.70 1.89 0.77
    K2O 4.75 4.37 3.52 4.82 4.53 4.18 4.86 4.52 4.68 4.53 3.47 4.58
    Na2O 3.28 3.15 3.15 3.49 3.26 3.13 3.22 3.33 3.12 3.06 2.93 3.42
    TiO2 0.21 0.36 0.30 0.35 0.24 0.30 0.26 0.35 0.33 0.30 0.60 0.22
    P2O5 0.17 0.17 0.17 0.17 0.16 0.16 0.16 0.17 0.16 0.16 0.21 0.16
    MnO 0.058 0.060 0.050 0.058 0.058 0.057 0.052 0.059 0.054 0.058 0.051 0.053
    烧失量 2.86 1.76 2.29 1.35 3.25 1.75 1.95 1.84 1.61 2.11 1.78 2.65
    S 0.0088 0.01 0.012 0.0099 0.0044 0.0097 0.0076 0.01 0.01 0.0085 0.016 0.01
    H2O+ 1.31 1.11 1.28 1.17 1.44 1.04 1.09 1.03 1.15 1.39 1.40 1.40
    H2O- 0.26 0.41 0.28 0.36 0.33 0.42 0.38 0.31 0.31 0.32 0.32 0.32
    总量 100.34 99.84 99.72 99.1 100.44 99.92 99.87 99.83 100.13 100.48 99.24 100.26
    Pb 43.1 80.5 40.3 55.8 39.1 39.8 32.8 50.8 46.4 38.9 33.2 47.3
    Cr 11.6 15.5 11.7 12.6 8.4 12.1 12.0 17.7 11.7 8.4 21.1 17.8
    Ni 9.30 10.80 5.55 6.95 5.20 5.66 5.80 6.64 6.28 5.68 8.71 5.86
    Co 5.05 6.00 4.44 5.08 4.12 4.52 4.61 5.01 5.03 4.65 8.83 4.80
    Rb 199 191 138 192 177 169 197 177 199 191 137 183
    Cs 11.00 7.79 11.60 6.02 10.60 7.94 16.20 8.91 8.68 7.52 12.10 10.40
    Sr 164 223 164 213 157 183 178 197 193 195 280 189
    Ba 662 634 686 864 592 599 646 645 599 641 642 711
    V 29.8 28.0 24.6 23.8 20.4 17.6 22.1 23.0 26.4 17.8 98.6 24.6
    Sc 5.53 6.11 5.84 6.98 4.95 5.97 5.64 6.72 6.39 5.42 12.20 6.38
    Nb 12.3 18.6 15.2 19.6 12.7 16.8 13.6 19.2 17.7 16.5 14.9 11.6
    Ta 2.02 2.49 2.48 2.08 2.16 1.96 2.33 2.11 1.61 1.50 1.05 1.04
    Zr 115 119 98 121 100 101 85 109 103 109 54 117
    Hf 3.78 3.95 3.77 4.26 3.73 3.64 3.20 3.98 3.71 4.00 2.12 3.96
    U 3.04 3.77 3.49 4.44 4.08 4.14 2.74 4.63 3.42 4.19 1.76 3.46
    Th 17.2 16.7 15.5 17.6 15.4 16.0 16.2 17.3 18.0 17.6 12.4 16.2
    La 62.2 54.1 37.2 47.5 35.4 44.4 49.4 51.3 55.0 51.3 33.8 38.7
    Ce 104.0 89.0 93.9 81.5 69.8 78.8 82.8 89.1 90.5 87.1 62.3 75.3
    Pr 11.4 9.87 8.18 9.03 7.82 8.56 9.05 9.34 9.71 9.19 7.11 8.18
    Nd 38.7 33.8 26.8 30.7 27.8 29.3 30.3 31.4 32.6 30.4 25.0 27.5
    Sm 6.38 6.07 5.34 5.71 5.05 5.26 5.40 5.58 5.66 5.50 4.76 5.07
    Eu 1.12 1.10 1.00 1.11 0.92 0.99 0.96 1.02 0.99 0.97 1.13 0.96
    Gd 5.75 5.77 5.08 5.29 4.71 4.92 5.00 5.30 5.30 5.16 4.92 4.82
    Tb 0.87 0.93 0.79 0.84 0.75 0.78 0.77 0.82 0.83 0.80 0.87 0.75
    Dy 3.99 4.55 3.72 3.96 3.56 3.67 3.53 3.84 3.79 3.76 4.47 3.56
    Ho 0.72 0.87 0.67 0.72 0.64 0.66 0.63 0.69 0.68 0.68 0.87 0.64
    Er 1.95 2.46 1.82 1.96 1.75 1.82 1.70 1.88 1.85 1.85 2.49 1.91
    Tm 0.27 0.35 0.26 0.29 0.25 0.26 0.24 0.27 0.26 0.26 0.37 0.25
    Yb 1.62 2.02 1.54 1.67 1.49 1.50 1.39 1.57 1.53 1.55 2.23 1.51
    Lu 0.23 0.30 0.23 0.24 0.22 0.22 0.2 0.23 0.23 0.22 0.34 0.22
    注：主量元素含量单位为%，微量和稀土元素含量为10-6
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    表 2  卧龙岗岩体WLG01和WLG03样品LA-ICP-MS锆石U-Th-Pb同位素数据

    Table 2.  LA-ICP-MS zircon U-Th-Pb isotopic data for WLG01 and WLG03 sample in the Wolonggang pluton

    分析点号 含量/ 10-6 Th/U 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
    WLG01
    01 13.9 133 352 0.38 0.0520 0.0019 0.2358 0.0060 0.0329 0.0006 284 69 215.0 4.9 208.8 3.4
    02 24.8 344 609 0.56 0.0517 0.0017 0.2308 0.0050 0.0324 0.0005 270 81 210.8 4.1 205.6 3.3
    03 18.9 195 475 0.41 0.0532 0.0019 0.2392 0.0056 0.0326 0.0005 336 82 217.8 4.6 207.0 3.4
    04 16.6 134 450 0.30 0.0510 0.0018 0.2211 0.0053 0.0315 0.0005 239 76 202.8 4.4 199.7 3.3
    05 18.1 177 461 0.38 0.0492 0.0017 0.2221 0.0053 0.0327 0.0005 159 116 203.6 4.4 207.5 3.4
    06 12.8 111 296 0.38 0.0602 0.0026 0.2575 0.0090 0.0310 0.0006 610 78 232.6 7.3 197.0 3.5
    07 16.2 140 415 0.34 0.0560 0.0020 0.2501 0.0060 0.0324 0.0005 451 81 226.7 4.8 205.5 3.4
    08 20.2 199 526 0.38 0.0557 0.0020 0.2424 0.0058 0.0316 0.0005 441 75 220.4 4.8 200.3 3.3
    09 21.9 252 540 0.47 0.0514 0.0018 0.2314 0.0053 0.0327 0.0005 258 77 211.4 4.3 207.2 3.4
    10 20.7 172 546 0.31 0.0516 0.0018 0.2264 0.0052 0.0318 0.0005 267 79 207.2 4.3 202.0 3.3
    11 21.3 168 380 0.44 0.0542 0.0020 0.2425 0.0064 0.0325 0.0006 378 80 220.4 5.3 205.9 3.4
    12 18.8 190 474 0.40 0.0518 0.0018 0.2334 0.0054 0.0327 0.0005 277 92 213.0 4.4 207.3 3.4
    13 20.8 240 524 0.46 0.0511 0.0018 0.2266 0.0052 0.0321 0.0005 247 76 207.4 4.3 203.9 3.3
    14 33.1 293 850 0.34 0.0524 0.0020 0.2260 0.0061 0.0313 0.0005 305 77 206.9 5.1 198.4 3.3
    15 18.5 163 482 0.34 0.0516 0.0018 0.2285 0.0055 0.0321 0.0005 269 77 208.9 4.5 203.7 3.3
    16 16.9 144 388 0.37 0.0526 0.0020 0.2350 0.0064 0.0324 0.0006 312 77 214.3 5.2 205.5 3.4
    17 17.6 196 442 0.44 0.0528 0.0019 0.2314 0.0055 0.0318 0.0005 320 81 211.4 4.6 201.7 3.3
    18 24.2 269 592 0.45 0.0537 0.0018 0.2433 0.0053 0.0329 0.0005 359 77 221.1 4.3 208.4 3.4
    19 17.7 90 294 0.30 0.0801 0.0030 0.5248 0.0139 0.0475 0.0008 1200 77 428.4 9.2 299.2 5.0
    20 27.6 304 736 0.41 0.0504 0.0018 0.2161 0.0051 0.0311 0.0005 213 83 198.7 4.3 197.4 3.2
    21 18.0 151 419 0.36 0.0513 0.0021 0.2290 0.0073 0.0324 0.0006 254 79 209.4 6.0 205.4 3.5
    22 17.4 170 400 0.43 0.0494 0.0020 0.2207 0.0067 0.0324 0.0006 169 83 202.5 5.6 205.4 3.5
    23 19.0 166 479 0.35 0.0504 0.0017 0.2274 0.0052 0.0327 0.0005 213 78 208.0 4.3 207.6 3.4
    24 18.2 140 453 0.31 0.0523 0.0018 0.2343 0.0056 0.0325 0.0005 296 74 213.7 4.6 206.3 3.4
    25 23.5 214 569 0.38 0.0516 0.0020 0.2321 0.0064 0.0326 0.0006 267 71 211.9 5.3 206.9 3.4
    26 14.1 163 328 0.50 0.0556 0.0024 0.2671 0.0092 0.0349 0.0006 435 79 240.3 7.4 220.8 3.9
    27 14.5 144 366 0.39 0.0513 0.0020 0.2295 0.0068 0.0325 0.0006 252 92 209.8 5.6 206.0 3.5
    28 15.4 175 391 0.45 0.0504 0.0019 0.2183 0.0060 0.0314 0.0005 213 91 200.5 5.0 199.4 3.3
    29 21.6 264 513 0.51 0.0514 0.0018 0.2292 0.0056 0.0323 0.0005 259 78 209.5 4.6 205.2 3.4
    30 19.0 264 464 0.57 0.0550 0.0020 0.2381 0.0060 0.0314 0.0005 413 78 216.8 4.9 199.2 3.3
    WLG03
    1 63.9 662 1700 0.39 0.0514 0.0016 0.2257 0.0040 0.0319 0.0005 257 84 206.7 3.3 202.3 3.2
    2 22.4 206 538 0.38 0.0513 0.0019 0.2257 0.0057 0.0319 0.0005 254 94 206.6 4.8 202.5 3.3
    3 28.6 238 784 0.30 0.0508 0.0019 0.2214 0.0057 0.0316 0.0005 232 88 203.1 4.8 200.6 3.3
    4 21.8 333 523 0.64 0.0505 0.0017 0.2224 0.0049 0.0319 0.0005 217 85 203.9 4.1 202.7 3.3
    5 24.2 431 761 0.57 0.0511 0.0027 0.2699 0.0121 0.0383 0.0007 245 79 242.6 9.6 242.3 4.5
    6 28.6 306 722 0.42 0.0497 0.0017 0.2196 0.0050 0.0321 0.0005 179 78 201.5 4.2 203.5 3.3
    7 14.6 130 366 0.36 0.0504 0.0021 0.2358 0.0077 0.0340 0.0006 212 94 215.0 6.3 215.2 3.7
    8 13.8 127 340 0.37 0.0501 0.0026 0.2210 0.0096 0.0320 0.0006 201 114 202.7 7.9 202.9 3.7
    9 25.0 274 655 0.42 0.0503 0.0018 0.2164 0.0051 0.0312 0.0005 208 79 198.9 4.3 198.2 3.2
    10 19.0 182 494 0.37 0.0497 0.0018 0.2190 0.0057 0.0319 0.0005 183 83 201.1 4.7 202.6 3.3
    11 18.7 183 474 0.39 0.0504 0.0020 0.2300 0.0068 0.0331 0.0006 212 89 210.2 5.6 210.0 3.5
    12 17.8 257 445 0.58 0.0502 0.0021 0.2150 0.0072 0.0310 0.0005 206 96 197.7 6.0 197.0 3.4
    13 19.5 198 507 0.39 0.0505 0.0021 0.2231 0.0074 0.0320 0.0006 218 95 204.5 6.2 203.3 3.5
    14 15.4 153 357 0.43 0.0505 0.0026 0.2451 0.0108 0.0352 0.0007 216 115 222.6 8.8 223.1 4.1
    15 18.5 199 455 0.44 0.0502 0.0023 0.2263 0.0083 0.0327 0.0006 203 102 207.2 6.9 207.5 3.6
    16 18.1 196 478 0.41 0.0504 0.0025 0.2291 0.0094 0.0330 0.0006 215 109 209.5 7.7 209.0 3.8
    17 12.9 111 307 0.36 0.0506 0.0020 0.2460 0.0073 0.0352 0.0006 224 89 223.3 5.9 223.3 3.7
    18 19.6 233 468 0.50 0.0509 0.0019 0.2414 0.0067 0.0344 0.0006 235 86 219.5 5.5 218.1 3.6
    19 19.6 237 474 0.50 0.0503 0.0023 0.2134 0.0079 0.0308 0.0006 209 102 196.4 6.6 195.4 3.4
    20 22.6 217 562 0.39 0.0502 0.0021 0.2403 0.0080 0.0347 0.0006 205 95 218.6 6.5 219.9 3.8
    21 18.8 143 468 0.31 0.0509 0.0019 0.2393 0.0062 0.0341 0.0006 234 83 217.9 5.1 216.4 3.6
    22 14.8 173 368 0.47 0.0594 0.0022 0.2601 0.0069 0.0318 0.0005 580 79 234.8 5.6 201.7 3.3
    23 17.5 160 445 0.36 0.0514 0.0023 0.2438 0.0086 0.0344 0.0006 259 98 221.5 7.0 218.0 3.8
    24 16.9 145 414 0.35 0.0512 0.0020 0.2454 0.0073 0.0348 0.0006 250 89 222.9 5.9 220.3 3.7
    25 21.6 225 536 0.42 0.0496 0.0018 0.2277 0.0057 0.0333 0.0006 174 83 208.3 4.7 211.3 3.5
    26 28.2 215 704 0.31 0.0515 0.0019 0.2374 0.0062 0.0335 0.0006 261 83 216.3 5.1 212.2 3.5
    27 14.5 137 364 0.38 0.0505 0.0020 0.2331 0.0067 0.0335 0.0006 216 88 212.8 5.5 212.5 3.5
    28 7.4 64 199 0.32 0.0506 0.0024 0.2235 0.0088 0.0321 0.0006 221 107 204.8 7.3 203.4 3.6
    29 21.0 208 507 0.41 0.0507 0.0021 0.2503 0.0080 0.0358 0.0006 229 93 226.8 6.5 226.7 3.8
    30 15.5 126 387 0.33 0.0503 0.0021 0.2494 0.0083 0.0360 0.0006 209 96 226.1 6.7 227.8 3.9
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    ①

    新疆地矿局第一区调队.卧龙岗幅I44E001021回风口幅I44E001022云母山幅I44E001023 1/5万区域矿产调查报告. 2005.

    ②

    中国地质科学院矿产综合利用研究所.新疆回风口地区矿产地质调查报告. 2015.

    ③

    新疆地矿局第一区调队.卧龙岗幅I44E001021回风口幅I44E001022云母山幅I44E001023 1/5万区域矿产调查报告. 2005.

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收稿日期:  2017-05-06
修回日期:  2018-01-15
刊出日期:  2018-10-25

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