Petrogenesis of the Early Paleozoic Jiergalangtu pluton in Inner Mongolia:Constraints from geochronology, geochemistry and Nd-Hf isotopes
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摘要:
兴蒙造山带北缘断续分布的早古生代岩浆岩带，对古生代构造格局恢复及造山带演化研究具有重要意义。阿巴嘎旗北部吉尔嘎郎图岩体位于该岩浆岩带中段，为带内最大的早古生代复式侵入体。LA-ICP-MS锆石U-Pb定年表明，吉尔嘎郎图岩体早期花岗闪长岩单元成岩年龄为455.0~495.6Ma。在主量元素组成上，岩体SiO2含量中等（59.49%~68.22%），贫铁、镁，K2O/Na2O值（0.64~0.85）小于1，A/CNK=0.96~1.09，整体具有亚碱、弱过铝特征。稀土及微量元素方面，岩体富Cs、Rb、Th、U、Pb，亏损Ba、Sr、P及高场强元素Nb、Ta等，稀土元素总量中等，具有弱负Eu异常（δEu=0.52~0.82）。Sr-Nd-Hf同位素分析结果显示，岩体具有亏损的同位素组成，（87Sr/86Sr）i=0.7053~0.7034，εNd（t）=0.39~4.29，2件Hf同位素样品εHf（t）均为正值，分别为εHf（t）=7.6~10.8和εHf（t）=3.7~7.9。岩石地球化学、年代学及Sr-Nd-Hf同位素综合分析表明，吉尔嘎郎图岩体是早古生代古亚洲洋沿苏左旗-锡林浩特一线向北俯冲背景下，遭受了俯冲板片析出流体交代作用影响的新生下地壳部分熔融的产物，后期由于弧后拉张、贺根山洋盆打开与主体岛弧带分离，最终随着古亚洲洋的整体闭合，形成了与俯冲带彼此分隔的格局。
Abstract:Early Paleozoic granites are distributed on the northern margin of Xingmeng orogenic belt discretely, and the genesis of these granites has important implications for the reconstruction of regional Paleozoic tectonic setting and orogenic evolution. Jier-galangtu pluton outcropped in northern Abag Banner and located in the middle of the early Paleozoic granite belt is the biggest com-posite pluton in the granite belt. Zircon LA-ICP-MS U-Pb dating shows that the early stage of the pluton was emplaced during 455.0~495.6Ma. Geochemically, the Jiergalangtu granites show moderate SiO2 values (59.49%~68.22%) and depletion of magnesium and iron, with K2O/Na2O ratios less than 1 (0.64~0.85) and A/CNK values being 0.96~1.09; in addition, most of the samples present subalkaline and weak per-aluminous signature. The trace element data of these rocks display enrichment of Cs, Rb, Th, U, Pb and depletion of Ba, Sr, P and HFSE such as Nb, Ta, the pluton exhibits indistinct negative europium anomalies(δEu=0.04~0.25) with moderate total REE content. Jiergalangtu pluton shows depleted isotopic compositions, (87Sr/86Sr)i=0.7053~0.7034, εNd(t)=0.39~4.29, and both samples for Hf isotopic analysis have positive εHf(t) values, being 7.6~10.8 and 3.7~7.9 respectively. Integrated geochemical, geochronology and Sr-Nd-Hf isotopic data suggest that the Jiergalangtu granites were generated in early Paleozoic and resulted from the subduction of Paleo-Asian Ocean along Sunid-Xilinhot. The granites were formed by partial melting of juvenile crust which was modified by subduction slab fluids. The back-arc extension and opening of Hegenshan Ocean possibly resulted in the separation of Jiergalagntu pluton from predominant Sunid-Xilinhot island arc. Along with the closure of Paleo-Asian Ocean, the pluton ultimately occurred on the northern margin of Xingmeng orogenic belt and was separated from the subduction zone by He-genshan ophiolite complex.
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表 1 吉尔嘎郎图岩体LA-ICP-MS锆石U-Th-Pb定年结果
Table 1. LA-ICP-MS zircon U-Th-Pb dating results of the Jiergalangtu granite pluton
点号 含量/10-6 Th/U 同位素比值 表面年龄/Ma Pb U 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 样品：15DX41;岩性：花岗闪长岩 15DX41-01 12 138 0.48 0.6772 0.0235 0.08183 0.00086 0.06002 0.00202 507 5 525 18 15DX41-03 18 207 0.58 0.6672 0.0190 0.08043 0.00084 0.06016 0.00162 499 5 519 15 15DX41-04 19 240 0.47 0.6311 0.0249 0.07689 0.00082 0.05953 0.00220 478 5 497 20 15DX41-05 16 179 0.52 0.6713 0.0172 0.08243 0.00088 0.05906 0.00146 511 5 522 13 15DX41-06 14 162 0.53 0.6656 0.0171 0.08161 0.00088 0.05915 0.00147 506 5 518 13 15DX41-07 29 346 0.65 0.6295 0.0242 0.07763 0.00080 0.05881 0.00223 482 5 496 19 15DX41-08 28 325 0.54 0.6336 0.0164 0.07951 0.00081 0.05780 0.00141 493 5 498 13 15DX41-09 27 296 0.67 0.6709 0.0191 0.08061 0.00091 0.06036 0.00150 500 6 521 15 15DX41-10 27 299 0.67 0.6657 0.0184 0.08110 0.00084 0.05953 0.00157 503 5 518 14 15DX41-11 24 280 0.61 0.6343 0.0165 0.07817 0.00080 0.05885 0.00148 485 5 499 13 15DX41-12 31 356 0.64 0.6618 0.0170 0.08116 0.00085 0.05914 0.00140 503 5 516 13 15DX41-15 20 231 0.60 0.6529 0.0158 0.08004 0.00082 0.05916 0.00138 496 5 510 12 15DX41-17 25 289 0.63 0.6490 0.0247 0.07872 0.00085 0.05980 0.00218 488 5 508 19 样品：15DX44;岩性：花岗闪长岩 15DX44-02 12 145 0.59 0.6153 0.0150 0.07662 0.00087 0.05824 0.00137 476 5 487 12 15DX44-03 12 141 0.54 0.6145 0.0182 0.07695 0.00083 0.05792 0.00165 478 5 486 14 15DX44-04 10 123 0.60 0.6147 0.0263 0.07756 0.00087 0.05748 0.00243 482 5 487 21 15DX44-05 11 136 0.56 0.6213 0.0164 0.07822 0.00087 0.05761 0.00148 485 5 491 13 15DX44-06 15 177 0.56 0.6214 0.0208 0.07827 0.00084 0.05758 0.00189 486 5 491 16 15DX44-07 12 153 0.52 0.6182 0.0315 0.07695 0.00083 0.05826 0.00291 478 5 489 25 15DX44-08 18 220 0.63 0.6174 0.0132 0.07775 0.00089 0.05759 0.00113 483 6 488 10 15DX44-09 17 206 0.62 0.6223 0.0262 0.07767 0.00097 0.05811 0.00228 482 6 491 21 15DX44-10 14 169 0.56 0.6243 0.0160 0.07746 0.00086 0.05846 0.00138 481 5 493 13 15DX44-11 15 178 0.58 0.6111 0.0137 0.07764 0.00083 0.05709 0.00121 482 5 484 11 15DX44-13 17 213 0.64 0.6129 0.0243 0.07630 0.00087 0.05826 0.00194 474 5 485 19 15DX44-15 12 156 0.63 0.6095 0.0180 0.07595 0.00086 0.05820 0.00164 472 5 483 14 15DX44-16 13 161 0.57 0.6094 0.0137 0.07722 0.00087 0.05724 0.00122 480 5 483 11 15DX44-17 16 211 0.52 0.5988 0.0149 0.07661 0.00082 0.05669 0.00136 476 5 476 12 15DX44-18 20 259 0.54 0.6007 0.0136 0.07657 0.00092 0.05690 0.00118 476 6 478 11 15DX44-19 19 244 0.54 0.6049 0.0180 0.07631 0.00118 0.05749 0.00156 474 7 480 14 样品：15DX50;岩性：英云闪长岩 15DX50-02 15 205 0.23 0.5702 0.0115 0.07343 0.00081 0.05631 0.00104 457 5 458 9 15DX50-06 9 131 0.17 0.5776 0.0217 0.07356 0.00081 0.05694 0.00215 458 5 463 17 15DX50-07 18 229 0.67 0.5708 0.0239 0.07318 0.00183 0.05658 0.00185 455 11 459 19 15DX50-08 12 163 0.42 0.5655 0.0245 0.07276 0.00082 0.05637 0.00225 453 5 455 20 15DX50-09 19 266 0.26 0.5804 0.0183 0.07407 0.00081 0.05684 0.00172 461 5 465 15 15DX50-10 25 334 0.43 0.5715 0.0101 0.07311 0.00083 0.05670 0.00089 455 5 459 8 15DX50-11 9 121 0.48 0.5697 0.0165 0.07279 0.00080 0.05676 0.00160 453 5 458 13 15DX50-12 26 374 0.15 0.5675 0.0107 0.07299 0.00084 0.05639 0.00099 454 5 456 9 15DX50-13 22 290 0.43 0.5680 0.0245 0.07323 0.00091 0.05625 0.00238 456 6 457 20 15DX50-14 22 303 0.47 0.5717 0.0106 0.07289 0.00082 0.05688 0.00100 454 5 459 9 15DX50-15 18 253 0.33 0.5703 0.0131 0.07300 0.00078 0.05666 0.00120 454 5 458 11 15DX50-16 22 294 0.42 0.5761 0.0099 0.07272 0.00079 0.05745 0.00091 453 5 462 8 
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表 2 吉尔嘎郎图岩体主量、微量和稀土元素含量
Table 2. Major, trace and rare earth element concentrations of the Jiergalangtu pluton
样号岩性 15DX43 15DX50-1 15DX50-2 15DX41 15DX44 15DX45 15DX46 15DX47 15DX48 英云闪长岩 花岗闪长岩 SiO2 59.49 68.22 64.43 62.80 66.27 65.68 65.68 65.13 64.92 TiO2 1.56 0.64 0.69 0.84 0.69 0.70 0.75 0.75 0.73 Al2O3 15.88 14.92 17.07 16.05 15.19 15.18 15.33 15.48 15.30 Fe2O3 3.09 1.68 1.73 1.84 2.39 2.52 2.11 1.69 2.99 FeO 5.00 2.54 2.79 3.63 2.08 2.52 2.69 3.02 2.01 MnO 0.14 0.07 0.08 0.10 0.08 0.10 0.09 0.05 0.09 MgO 2.77 1.28 1.36 2.26 1.46 1.74 1.62 1.67 1.62 CaO 4.23 2.63 2.89 4.20 2.11 1.99 2.01 2.73 3.12 Na2O 3.73 3.80 4.26 3.66 4.04 4.16 4.25 3.93 3.79 K2O 2.42 2.44 3.51 2.35 3.45 3.28 3.08 3.01 3.09 P2O5 0.18 0.52 0.36 0.19 0.17 0.16 0.18 0.18 0.17 LOI 0.95 1.91 0.96 1.68 1.83 1.68 1.92 2.02 1.95 ALK 6.15 6.24 7.77 6.01 7.49 7.44 7.33 6.94 6.88 A.R. 1.88 2.10 2.27 1.84 2.53 2.53 2.46 2.23 2.19 A/CNK 0.96 1.09 1.06 0.99 1.07 1.08 1.10 1.05 1.00 A/NK 1.81 1.68 1.58 1.87 1.46 1.46 1.48 1.59 1.60 Sc 27.70 15.60 17.30 17.50 17.90 19.00 18.70 17.70 18.00 V 243 60 64 105 72 76 80 79 80 Cr 22.90 17.30 19.10 32.50 18.60 21.00 20.60 21.60 26.30 Co 18.60 7.66 8.21 13.40 8.53 8.98 9.28 9.57 9.50 Ni 29.10 9.68 11.40 20.40 11.70 12.20 12.10 12.70 13.20 Cu 59.70 15.20 18.80 25.40 17.90 118.00 21.30 152.00 20.40 Zn 92.00 58.60 61.30 61.60 55.30 148.00 61.90 46.20 60.10 Ga 19.90 19.70 20.70 18.90 18.20 19.20 18.70 19.00 18.50 Cs 7.08 5.94 5.80 4.59 3.67 7.49 4.20 3.82 5.41 Rb 123 111 145 86 140 136 118 124 140 Ba 238 288 562 240 443 547 393 412 350 Th 6.37 11.20 8.04 11.90 10.60 10.10 9.58 10.30 11.10 U 1.07 1.70 1.31 0.97 1.97 1.58 1.64 1.80 1.32 Nb 19.40 11.60 12.10 10.50 11.90 11.20 12.90 12.30 12.10 Ta 1.08 0.69 0.71 0.62 0.80 0.74 0.82 0.77 0.82 Pb 13.10 17.80 19.10 15.10 21.60 83.60 16.50 13.70 17.20 Sr 206 157 183 245 197 296 156 193 205 Nd 30.00 29.20 26.30 32.90 27.20 29.30 27.80 28.50 30.20 Zr 223 324 316 260 234 256 264 259 277 Hf 5.70 8.32 7.56 6.55 6.26 6.82 6.80 6.71 7.23 La 17.90 27.50 23.90 32.30 23.80 26.70 23.40 24.90 26.50 Ce 44.70 66.00 57.60 52.80 56.40 63.20 53.70 57.80 55.40 Pr 6.64 7.38 6.53 8.53 6.75 7.42 6.82 7.14 7.58 Sm 7.70 5.97 5.36 6.59 5.85 6.26 6.03 6.11 6.67 Eu 1.34 1.25 1.42 1.37 1.21 1.40 1.24 1.26 1.27 Gd 8.00 5.98 5.18 6.56 6.20 6.50 6.00 6.67 6.97 Tb 1.38 0.93 0.75 1.04 0.98 1.03 1.02 1.05 1.07 Dy 8.26 5.18 3.79 6.03 5.68 5.78 5.89 6.02 6.21 Y 44.90 28.80 21.70 33.80 32.90 32.00 34.60 34.20 35.80 Ho 1.70 1.06 0.76 1.22 1.21 1.19 1.23 1.23 1.30 Er 4.46 2.94 2.38 3.37 3.34 3.30 3.50 3.43 3.57 Tm 0.65 0.46 0.46 0.51 0.52 0.53 0.54 0.53 0.56 Yb 4.38 3.22 3.41 3.45 3.64 3.48 3.78 3.75 3.91 Lu 0.65 0.50 0.50 0.53 0.56 0.54 0.57 0.57 0.60 ∑REE 137.76 157.57 138.34 157.20 143.34 156.63 141.52 148.96 151.81 (La/Yb)N 2.76 5.76 4.73 6.31 4.41 5.17 4.17 4.48 4.57 (La/Sm)N 1.46 2.90 2.80 3.08 2.56 2.68 2.44 2.56 2.50 (Gd/Yb)N 1.47 1.50 1.23 1.53 1.37 1.51 1.28 1.44 1.44 δEu 0.52 0.64 0.82 0.64 0.61 0.67 0.63 0.60 0.57 注：主量元素含量单位为%，微量和稀土元素为10-6
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表 3 吉尔嘎郎图岩体Sr-Nd同位素组成
Table 3. Sr-Nd isotopic compositions of the Jiergalangtu pluton
样品 年龄/Ma 87Rb/86Sr 87Sr/86Sr ISr 147Sm/144Nd 143Nd/144Nd INd εNd TDM2/Ga 英云闪长岩 455 1.729026 0.716229 0.705024 0.155079 0.512617 0.512465 0.39 0.91 15DX43 花岗闪长岩 15DX41 496 1.018378 0.711614 0.704416 0.126671 0.512518 0.512106 2.10 1.05 15DX44 479 2.058181 0.717598 0.703551 0.136012 0.512527 0.512100 1.55 1.08 15DX45 479 1.330244 0.714350 0.705271 0.135113 0.512503 0.512079 1.14 1.12 15DX46 479 2.190845 0.718361 0.703409 0.137171 0.512671 0.512241 4.29 0.86 15DX47 479 1.860551 0.716545 0.703847 0.135577 0.512528 0.512103 1.60 1.08 15DX48 479 1.977821 0.717384 0.703885 0.139672 0.512529 0.512091 1.37 1.10
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表 4 吉尔嘎郎图岩体锆石Hf同位素分析结果
Table 4. Zircon Hf isotopic compositions of the Jiergalangtu pluton
点号 年龄/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i ε Hf(t) 2σ TDM2/Ma fLu/Hf 样号：15DX41；岩性：花岗闪长岩 1 496 0.043114 0.001060 0.282787 0.000021 0.282778 10.8 0.7 867 -0.97 2 496 0.042802 0.001037 0.282696 0.000023 0.282687 7.6 0.8 1157 -0.97 3 496 0.039795 0.000977 0.282696 0.000019 0.282687 7.6 0.7 1157 -0.97 4 496 0.043458 0.001064 0.282754 0.000021 0.282744 9.6 0.7 974 -0.97 5 496 0.054542 0.001314 0.282708 0.000022 0.282696 7.9 0.8 1127 -0.96 6 496 0.063863 0.001545 0.282735 0.000018 0.282720 8.8 0.6 1050 -0.95 7 496 0.047100 0.001158 0.282720 0.000020 0.282710 8.4 0.7 1083 -0.97 8 496 0.044092 0.001094 0.282732 0.000018 0.282722 8.8 0.6 1045 -0.97 9 496 0.042020 0.001041 0.282738 0.000020 0.282728 9.0 0.7 1025 -0.97 10 496 0.032544 0.000879 0.282744 0.000018 0.282736 9.3 0.6 1000 -0.97 11 496 0.041902 0.001155 0.282709 0.000019 0.282698 8.0 0.7 1120 -0.97 12 496 0.042077 0.001107 0.282723 0.000017 0.282713 8.5 0.6 1073 -0.97 13 496 0.051465 0.001314 0.282728 0.000027 0.282716 8.6 0.9 1064 -0.96 14 496 0.034851 0.000871 0.282697 0.000019 0.282689 7.6 0.7 1150 -0.97 样号：15DX44；岩性：花岗闪长岩 1 479 0.038740 0.000941 0.282654 0.000019 0.282646 5.7 0.7 1310 -0.97 2 479 0.041968 0.001031 0.282649 0.000019 0.282639 5.5 0.7 1330 -0.97 3 479 0.053168 0.001273 0.282625 0.000021 0.282613 4.6 0.7 1413 -0.96 4 479 0.045373 0.001100 0.282644 0.000025 0.282634 5.3 0.9 1346 -0.97 5 479 0.062300 0.001467 0.282644 0.000026 0.282631 5.2 0.9 1358 -0.96 6 479 0.034609 0.000838 0.282670 0.000020 0.282663 6.3 0.7 1256 -0.97 7 479 0.040315 0.000981 0.282645 0.000024 0.282636 5.4 0.8 1341 -0.97 8 479 0.041025 0.000976 0.282598 0.000022 0.282589 3.7 0.8 1491 -0.97 9 479 0.043097 0.001049 0.282709 0.000020 0.282700 7.6 0.7 1138 -0.97 10 479 0.046036 0.001094 0.282605 0.000023 0.282595 3.9 0.8 1472 -0.97 11 479 0.036262 0.000951 0.282660 0.000019 0.282651 5.9 0.7 1292 -0.97 12 479 0.035780 0.000908 0.282713 0.000019 0.282705 7.9 0.7 1120 -0.97 13 479 0.035579 0.000907 0.282672 0.000020 0.282663 6.4 0.7 1253 -0.97
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① 天津华北地质勘查局. 1: 5万查干楚鲁廷阿查6幅区域地质调查报告. 2012.
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