Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite
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摘要:
黑红山二长花岗岩分布于红石山-百合山-蓬勃山蛇绿岩带北部，地球化学特征显示其属于准铝质-弱过铝质、中-高钾钙碱性系列，为高分异的I型花岗岩；轻稀土元素富集，轻、重稀土元素分馏明显，具弱负Eu异常，稀土元素曲线为右缓倾。微量元素相对富集Ba、K、Zr、Hf，亏损Ta、Nb、P、Ti，显示与俯冲有关的侵入岩特征，形成于碰撞前的火山弧环境。LA-ICP-MS锆石U-Pb定年获得206Pb/238U年龄加权平均值为315.2±2.5Ma。综合研究表明，黑红山地区在晚石炭世属于活动大陆边缘的火山弧，红石山-百合山-蓬勃山蛇绿岩带所代表的洋盆在此尚未消亡。
Abstract:The Late Carboniferous admellite in the Heihongshan area is located in the northern part of the Hongshishan-Baiheshan-Pengboshan ophiolite belt. The geochemical characteristics show that the admellite belongs to metaluminous to weakly peralic potassium aluminous calc alkaline series I type granite of high differentiation; its LREE enrichment and LREE and HREE fractionation are obvious, with weak Eu negative anomaly and right-inclined rare earth curve. Trace elements are relatively enriched in Ba, K, Zr and Hf but depleted in Nb, Ti, P and Sr, indicating the characteristics of intrusive rocks related to subduction and formed in the volcanic arc environment before collision. The U-Pb dating of LA-ICP-MS zircon yielded weighted average 206Pb/238U age of 315.2±2.5Ma. Comprehensive studies show that the Heihongshan area belonged to the volcanic arcs on the active continental margin in the Late Carboniferous epoch, and the Hongshishan-Baiheshan-Pengboshan ophiolite belt suggests that the oceanic basin in Heihongshan area was closed in the Late Carboniferous epoch.
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Key words:
- geochemical characteristics /
- zircon U-Pb dating /
- Late Carboniferous /
- admellite /
- Heihongshan
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表 1 二长花岗岩主量元素、化学参数及CIPW标准矿物含量
Table 1. Major elements, chemical parameters and CIPW norms of admellite
% 分析项 YQ21 YQ24 YQ25 YQ26 YQ27 P3YQ1 SiO2 75.06 79.18 69.74 72.88 72.55 70.88 TiO2 0.25 0.18 0.45 0.29 0.32 0.36 Al2O3 12.89 10.95 14.89 13.40 13.88 14.44 Fe2O3 0.82 0.67 1.50 1.08 1.21 1.32 FeO 0.44 0.32 1.25 0.62 0.72 0.92 MnO 0.054 0.035 0.097 0.060 0.062 0.073 MgO 0.39 0.35 0.89 0.46 0.63 0.78 CaO 0.93 0.47 1.48 1.48 1.40 1.49 Na2O 4.27 3.85 4.95 4.27 4.54 4.93 K2O 4.04 3.32 3.06 3.46 3.15 3.03 P2O5 0.052 0.041 0.13 0.076 0.088 0.10 烧失量 0.64 0.52 1.42 1.82 1.32 1.53 总计 99.84 99.88 99.69 99.92 99.91 99.49 Q 32.43 42.76 24.94 31.42 30.45 26.57 An 4.09 2.09 6.6 6.98 6.48 6.86 Ab 36.46 32.81 42.6 36.88 39.03 42.42 Or 24.09 19.74 18.36 20.88 18.87 18.22 C 0 0.26 1.07 0.12 0.67 0.59 Hy 1.34 1.27 3.46 1.9 2.43 2.95 Il 0.47 0.35 0.87 0.55 0.62 0.69 Mt 0.84 0.62 1.8 1.09 1.24 1.45 Ap 0.12 0.1 0.3 0.18 0.21 0.24 σ 2.15 1.42 2.38 1.99 1.99 2.25 A.R 4.02 4.38 2.92 3.17 3.03 3 DI 92.98 95.31 85.9 89.18 88.35 87.21 SI 3.91 4.07 7.65 4.68 6.18 7.13 R1 2518 3120 2120 2525 2460 2233 R2 374 284 502 453 460 490 A/CNK 0.985 1.015 1.053 0.995 1.033 1.024 A/NK 1.13 1.102 1.3 1.243 1.275 1.268 A/MF 4.85 5.02 2.51 3.92 3.33 2.91 C/MF 0.63 0.39 0.45 0.79 0.61 0.55 
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表 2 二长花岗岩稀土和微量元素含量及特征参数
Table 2. REE and trace element analyses of admellite
10-6 元素 PM03XT2 PM03XT3 PM21XT1 PM21XT2 PM21XT3 PM21XT4 La 29.63 17.75 30.91 31.24 26.8 25.7 Ce 59.81 35.52 42.14 42.94 36.11 31.98 Pr 7.3 4.48 5.61 5.46 4.82 4.45 Nd 27.44 16.99 21.87 20.47 18.7 17 Sm 5.33 3.4 4.23 3.59 3.63 3.09 Eu 1.06 0.87 1.06 0.88 0.81 0.86 Gd 4.79 3.11 3.79 3.2 3.28 2.79 Tb 0.88 0.57 0.65 0.52 0.58 0.47 Dy 5.31 3.5 4 3.19 3.74 2.85 Ho 1.06 0.71 0.78 0.63 0.75 0.57 Er 3.13 2.02 2.41 2.03 2.3 1.77 Tm 0.56 0.37 0.46 0.39 0.45 0.33 Yb 3.77 2.35 2.79 2.46 2.71 2.01 Lu 0.6 0.42 0.46 0.42 0.45 0.35 Y 32.9 19.46 30.09 25.27 28.05 21.93 ∑REE 183.58 111.49 151.26 142.69 133.18 116.15 ∑LREE 130.57 79 105.83 104.56 90.87 83.08 ∑HREE 20.1 13.03 15.35 12.86 14.27 11.15 ∑LREE/∑HREE 6.49 6.06 6.9 8.13 6.37 7.45 δEu 0.63 0.8 0.79 0.78 0.7 0.88 δCe 0.95 0.94 0.72 0.73 0.71 0.66 La/Sm 5.56 5.22 7.3 8.71 7.39 8.31 La/Yb 7.86 7.54 11.06 12.72 9.9 12.77 Ce/Yb 15.86 15.09 15.08 17.49 13.34 15.89 Eu/Sm 0.2 0.25 0.25 0.24 0.22 0.28 Sm/Nd 0.19 0.2 0.19 0.18 0.19 0.18 (La/Yb)N 5.3 5.08 7.46 8.58 6.68 8.61 Li 7.21 6.07 21.1 9.39 7.55 11.9 Be 1.77 1.18 1.72 1.61 1.43 1.54 Sc 6.53 5.31 5.57 1.8 2.41 3.4 V 12.2 8.46 53.2 29.1 32.1 39 Cr 3.88 3.68 1.99 1.53 1.25 1.22 Co 0.94 0.88 3.94 1.93 2.34 3.19 Ni 1.42 0.8 1.22 0.96 0.86 0.88 Cu 4 4.6 5.36 2.95 4.36 7.29 Zn 23.5 10.2 35 27.5 31.8 28.8 Ga 14.7 10.2 16.1 14.5 13.8 14 Rb 80.9 63.2 71.4 55.1 62.4 61 Sr 125 111 237 172 150 234 Zr 167 119 170 131 130 133 Nb 10.5 7.48 9.48 9.06 9.91 7.84 Mo 0.5 3.31 2.01 2.3 0.39 0.54 Cs 1 0.65 1.64 1.64 0.99 1.8 Ba 960 717 776 738 681 839 Hf 5.11 3.91 4.92 3.9 4.13 3.96 Ta 0.67 0.52 0.49 0.62 0.67 0.44 W 0.54 0.71 1.14 0.68 0.4 0.37 Tl 0.61 0.54 0.29 0.39 0.27 0.25 Pb 13.4 8.84 5.69 5.07 5.98 4.99 Bi 0.17 0.18 0.086 0.07 0.056 0.055 Th 9.89 7.14 6.69 8.37 7.68 6.35 U 2.67 2.33 1.53 1.85 2.21 2.01 K 33561.13 27547.45 25381 28747 26121 25161 Cd 0.036 0.028 0.015 0.046 In 0.047 0.022 0.027 0.031
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表 3 二长花岗岩（PM03TW1）LA-ICP-MS锆石U-Th-Pb同位素测年数据
Table 3. LA-ICP-MS zircon U-Th-Pb isotope analytical results of admellite(PM03TW1)
测点 Pb/10-6 Th/10-6 U/10-6 206Pb/238U 207Pb/235U 年龄/Ma Th/U 比值 1σ 比值 1σ 206Pb/238U 1σ 207Pb/235U 1σ 1 4 55 77 0.0504 0.0007 0.412 0.017 317 4 350 15 0.71 2 4 67 83 0.0493 0.0006 0.409 0.016 310 4 348 14 0.80 3 7 106 141 0.0495 0.0009 0.372 0.012 312 5 322 10 0.75 4 5 40 95 0.0502 0.0019 0.401 0.019 316 12 343 17 0.42 5 4 47 71 0.0522 0.0027 0.371 0.032 328 17 321 28 0.65 6 6 32 101 0.0540 0.0069 0.349 0.056 339 44 304 50 0.31 7 4 48 84 0.0509 0.0010 0.454 0.624 320 6 380 523 0.56 8 4 52 69 0.0510 0.0008 0.376 0.016 321 5 324 14 0.75 9 3 32 56 0.0506 0.0022 0.399 0.031 318 14 341 27 0.58 10 4 44 85 0.0499 0.0012 0.399 0.02 314 8 341 18 0.52 11 3 51 68 0.0492 0.0007 0.409 0.020 310 5 349 17 0.75 12 6 65 130 0.0484 0.0008 0.389 0.014 304 5 334 12 0.50 13 5 54 87 0.0509 0.0009 0.404 0.019 320 6 345 16 0.62 14 5 43 98 0.0495 0.0011 0.419 0.017 311 7 356 15 0.43 15 7 86 133 0.0496 0.0009 0.393 0.020 312 6 337 17 0.65 16 4 36 77 0.0525 0.0042 0.417 0.025 330 27 354 21 0.47 17 4 46 65 0.0491 0.0008 1.260 0.866 309 5 828 569 0.71 18 4 41 69 0.0498 0.0012 0.380 0.019 314 7 327 16 0.59 19 5 65 104 0.0498 0.0011 0.374 0.014 313 7 323 12 0.62 20 4 48 81 0.0511 0.0015 0.428 0.028 321 9 362 24 0.59 21 4 40 63 0.0599 0.0015 0.941 0.063 375 9 673 45 0.63 22 4 36 78 0.0492 0.0009 0.365 0.015 310 6 316 13 0.46 23 6 53 93 0.0620 0.0013 0.575 0.024 388 8 461 19 0.57 24 4 34 74 0.0509 0.0010 0.409 0.016 320 6 348 14 0.46 25 3 21 37 0.0637 0.0013 1.415 0.083 398 8 895 53 0.56 26 6 91 113 0.0510 0.0011 0.396 0.019 321 7 339 16 0.80 27 4 27 60 0.0558 0.0015 0.471 0.026 350 9 392 21 0.45 28 8 104 142 0.0508 0.0010 0.393 0.017 320 7 337 14 0.73 29 9 119 152 0.0519 0.0011 0.404 0.016 326 7 344 14 0.78 30 6 73 100 0.0512 0.0008 0.387 0.016 322 5 332 14 0.73
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① 河北省区域地质调查院. K-47-E-010012(黑红山)幅2018年度区域地质调查工作方案. 2018.
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