Zircon U-Pb geochronology and petrogenesis of rhyolites in Manketouebo Formation from the Kundu area in Jarud Basin, Inner Mongo-lia
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摘要:
为研究内蒙古扎鲁特盆地坤都地区晚侏罗世火山岩的构造属性，对研究区内流纹岩开展了锆石U-Pb定年和原位Lu-Hf同位素研究。锆石U-Pb定年结果显示，流纹岩形成于151.2±1.2Ma，属于晚侏罗世。岩石地球化学研究表明，火山岩具高硅富碱、贫镁钙的特征，稀土元素总量为110.38×10-6~138.88×10-6，轻、重稀土元素分馏中等，弱负Eu异常（δEu=0.72~0.98），微量元素特征为富集Cs、Rb、Ba和轻稀土元素，强烈亏损Sr、P、Ti，相对亏损Nb、Ta，εHf（t）值为-10.1~4.9，对应的地壳模式年龄（TDMC）为1192~3639Ma，反映其岩浆来源于元古宙、太古宙地壳物质的部分熔融，之后经历矿物分离结晶作用。通过对比大兴安岭地区同时代岩浆-构造活动，研究区满克头鄂博组流纹岩形成于后造山伸展背景，与蒙古-鄂霍茨克造山后伸展作用有关。
Abstract:Age and tectonic implications of the Late Jurassic rhyolites in Kundu area of Jarud Basin were studied by using zircon U-Pb dating, in situ Lu-Hf isotopic analysis, petrographic analysis and other geochemical methods. LA-ICP-MS zircon U-Pb dating results show that the rhyolites were formed in Late Jurassic, with their formation age being 151.2±1.2Ma. The geochemical study suggests that rhyolites are rich in silicon and alkali, but poor in calcium and magnesia. The REE values of them are between 110.38×10-6 and 138.88×10-6, displaying medium LREE-enriched and HREE-depleted REE patterns[(La/Yb)N=6.24~7.43], with weak negative Eu anomaly (δEu=0.72~0.98). The trace element geochemistry is characterized evidently by enrichment of Cs, Rb, Ba and LREE, strong depletion of Sr, P, Ti, and mediate depletion of Nb, Ta, with the εHf(t) values varying from -10.1~4.9, corresponding to TDMC model ages of 1192~3639Ma, which shows that the rhyolitc magma originated mainly from the partial melting of Proterozoic and Archean crustal rocks, and suffered fractional crystallization. Based on the above result, in combination with previous studies of the contemporaneous magma-tectonic activities in Da Hinggan Mountains, the authors hold that the rhyolites in Manketouebo Formation were formed in an extensional setting related to Mongolia Okhotsk orogenesis
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Key words:
- Jarud Basin /
- Late Jurassic /
- rhyolites /
- Manketouebo Formation /
- zircon U-Pb dating /
- Hf isotope
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表 1 满克头鄂博组流纹岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb analytical results of rhyolites in Manketouebo Formation
分析点 含量/10-6 Th/U 同位素比值 年龄/Ma Pb 232Th 238U 207Pb/
206Pb±1σ 207Pb/
235U±1σ 206Pb/
238U±1σ 208Pb/
232Th±1σ 207Pb/
206Pb±1σ 207Pb/
235U±1σ 206Pb/
238U±1σ 208Pb/
232Th±1σ 01 7 93 106 0.88 0.0527 0.0042 0.1619 0.0110 0.0235 0.0006 0.0074 0.0003 322 183 152 10 150 4 148 6 02 11 152 114 1.34 0.0507 0.0040 0.1601 0.0119 0.0235 0.0006 0.0080 0.0003 228 181 151 10 150 4 161 5 03 11 149 107 1.40 0.0478 0.0085 0.1498 0.0303 0.0221 0.0012 0.0068 0.0006 100 378 142 27 141 8 137 12 04 14 201 183 1.09 0.0486 0.0029 0.1598 0.0102 0.0236 0.0005 0.0070 0.0003 128 137 151 9 150 3 141 5 05 26 153 115 1.33 0.1441 0.0096 0.5493 0.0491 0.0261 0.0009 0.0130 0.0008 2277 115 445 32 166 6 261 16 06 8 90 102 0.89 0.0539 0.0056 0.1793 0.0225 0.0231 0.0009 0.0094 0.0009 369 235 167 19 147 6 190 18 07 18 238 225 1.06 0.0497 0.0025 0.1617 0.0080 0.0237 0.0004 0.0079 0.0002 189 119 152 7 151 3 158 4 08 17 244 162 1.51 0.0495 0.0028 0.1593 0.0084 0.0237 0.0005 0.0076 0.0002 169 130 150 7 151 3 153 4 09 4 42 92 0.46 0.0467 0.0037 0.1622 0.0103 0.0236 0.0007 0.0074 0.0005 32 178 153 9 150 5 149 10 10 17 304 205 1.48 0.0505 0.0050 0.1595 0.0142 0.0236 0.0011 0.0061 0.0003 220 215 150 12 150 7 123 5 11 20 303 190 1.59 0.0484 0.0020 0.1613 0.0076 0.0239 0.0004 0.0075 0.0002 117 100 152 7 152 3 152 4 12 18 200 186 1.08 0.0488 0.0023 0.1641 0.0068 0.0237 0.0004 0.0079 0.0002 139 111 154 6 151 2 159 4 13 9 47 71 0.66 0.0524 0.0060 0.1727 0.0184 0.0236 0.0011 0.0078 0.0007 306 263 162 16 150 7 158 13 14 9 77 90 0.86 0.0504 0.0062 0.1914 0.0209 0.0280 0.0013 0.0093 0.0005 213 263 178 18 178 8 187 10 15 16 136 202 0.67 0.0496 0.0020 0.1614 0.0061 0.0238 0.0004 0.0076 0.0002 189 125 152 5 152 2 152 4 16 17 239 227 1.05 0.0499 0.0021 0.1601 0.0067 0.0235 0.0004 0.0072 0.0002 191 100 151 6 149 2 144 4 17 11 109 228 0.48 0.0472 0.0020 0.1528 0.0058 0.0238 0.0004 0.0072 0.0002 58 109 144 5 151 3 146 5 18 24 293 371 0.79 0.0498 0.0018 0.1630 0.0061 0.0239 0.0004 0.0075 0.0002 183 118 153 5 152 2 151 4 19 7 56 59 0.95 0.0536 0.0089 0.2200 0.0374 0.0299 0.0021 0.0143 0.0014 354 341 202 31 190 13 286 28 20 30 425 263 1.62 0.0496 0.0024 0.1585 0.0080 0.0234 0.0006 0.0074 0.0002 176 113 149 7 149 4 150 4 21 10 88 102 0.87 0.0496 0.0053 0.1559 0.0170 0.0233 0.0010 0.0074 0.0004 176 230 147 15 148 6 149 8 22 9 94 137 0.69 0.0489 0.0029 0.1585 0.0088 0.0239 0.0005 0.0086 0.0003 143 137 149 8 152 3 173 7 23 14 182 169 1.08 0.0507 0.0025 0.1593 0.0072 0.0232 0.0006 0.0076 0.0003 228 115 150 6 148 4 154 5 24 31 349 573 0.61 0.0497 0.0016 0.1654 0.0056 0.0242 0.0005 0.0077 0.0002 189 76 155 5 154 3 154 4 25 11 76 139 0.55 0.0512 0.0020 0.2672 0.0100 0.0377 0.0006 0.0132 0.0004 256 89 240 8 238 4 265 8 26 40 572 436 1.31 0.0499 0.0016 0.1654 0.0057 0.0240 0.0004 0.0080 0.0002 191 71 155 5 153 2 160 3 27 16 167 200 0.83 0.0502 0.0022 0.1620 0.0066 0.0237 0.0003 0.0076 0.0002 211 102 152 6 151 2 154 4 28 13 188 159 1.19 0.0494 0.0020 0.1621 0.0063 0.0237 0.0004 0.0075 0.0002 165 96 153 6 151 3 151 4 29 8 59 59 1.01 0.0467 0.0034 0.1797 0.0108 0.0249 0.0007 0.0081 0.0003 35 176 168 9 158 4 163 7 30 9 101 108 0.93 0.0512 0.0040 0.1648 0.0115 0.0243 0.0007 0.0083 0.0003 250 180 155 10 155 5 168 6 
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表 2 满克头鄂博组流纹岩主量、微量及稀土元素分析结果
Table 2. Major, trace and REE compositions of rhyolites in Manketouebo Formation
样品号 PM421YQ31 PM421YQ34 KD-2 KD-3 KD-4 SiO2 76.61 75.22 75.91 77.53 76.39 TiO2 0.15 0.18 0.19 0.15 0.16 Al2O3 12.24 13.1 12.71 11.7 12.27 Fe2O3 0.93 1.14 1.3 0.85 0.79 FeO 0.22 0.29 0.27 0.27 0.54 MnO 0.03 0.02 0.04 0.07 0.07 MgO 0.35 0.37 0.26 0.002 0.04 CaO 0.32 0.41 0.19 0.08 0.23 Na2O 1.76 2.89 3.43 3.23 3.22 K2O 5.63 4.97 4.86 4.79 5.48 P2O5 0.05 0.06 0.04 0.01 0.03 烧失量 1.29 1.05 0.98 0.95 0.91 总量 99.59 99.72 100.18 99.63 100.13 A/CNK 1.28 1.2 1.13 1.1 1.05 AR 3.86 2.50 3.27 3.43 3.13 Na2O+K2O 7.39 7.86 8.29 8.02 8.7 La 26.77 28.29 27.07 23.77 24.2 Ce 50.35 56.11 51.53 44.8 46.63 Pr 6.32 6.83 6.43 5.53 5.58 Nd 21.98 25.75 22.4 19.61 20.02 Sm 3.89 4.37 4.3 3.52 3.69 Eu 1.21 1.23 0.95 0.88 0.92 Gd 3.55 4.16 3.6 3.07 3.26 Tb 0.52 0.56 0.76 0.6 0.63 Dy 3.36 3.59 3.73 3.13 3.48 Ho 0.71 0.71 0.81 0.64 0.74 Er 1.8 1.99 2.19 1.83 2.17 Tm 0.38 0.37 0.49 0.38 0.42 Yb 2.43 2.57 2.67 2.25 2.61 Lu 0.35 0.35 0.47 0.38 0.43 ∑REE 123.6 136.88 127.4 110.38 114.78 (La/Yb)N 7.42 7.43 6.83 7.13 6.24 (La/Sm)N 4.33 4.07 3.96 4.25 4.13 (Gd/Lu)N 1.27 1.46 0.95 1.01 0.94 δEu 0.98 0.87 0.72 0.8 0.79 Y 21.49 21.79 19.92 17.11 19.9 Rb 144.7 137.58 124.45 109.29 125.56 Ba 1000 795.03 824.49 952.51 1100 Th 4.33 4.87 11.13 10.55 10.52 U 2.19 2.41 2.38 1.65 1.93 Nb 13.3 13.99 14.4 13.03 14.14 Ta 0.75 0.54 1.38 1.19 1.2 Hf 3.07 3.27 4.87 4.44 4.46 Sc 4.85 3.41 4.45 3.63 3.68 Ga 16.61 17.03 15.12 14.24 15.43 Pb 22.97 31.06 30.72 23.72 27.76 Sr 73.36 93.63 84.48 71.57 87.1 Cr 16.75 11.8 13.72 10.85 13.88 Zr 111.2 127.06 128.07 105.25 109.53 Co 2.04 1.76 2.83 2.76 2.53 Ni 2.7 0.87 2.59 6.56 11.2 V 11.67 10.76 13.79 10.59 13.67 Sb 0.23 0.3 0.38 0.21 0.22 Rb/Sr 1.97 1.47 1.47 1.53 1.44 Ti/Y 42.68 49.39 58.39 52.56 48.40 Ti/Zr 8.25 8.47 9.08 8.54 8.87 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 满克头鄂博组流纹岩锆石Hf同位素分析结果
Table 3. Zircon Hf isotopic compositions of rhyolites in Manketouebo Formation
测点 年龄/Ma 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Lu/177Hf 2σ (176Lu/177Hf)i εHf(0) εHf(t) TDM/Ma TDMc/Ma fLu/Hf 4 150 0.049168 0.000388 0.002152 0.000015 0.282399 0.000045 0.282393 -13.2 -10.1 1244 2546 -0.94 6 147 0.027371 0.000573 0.001190 0.000025 0.282645 0.000038 0.282642 -4.5 -1.4 865 1761 -0.96 8 151 0.039872 0.001256 0.001744 0.000055 0.282438 0.000039 0.282434 -11.8 -8.7 1174 2417 -0.95 9 150 0.018361 0.000418 0.000814 0.000017 0.282821 0.000034 0.282818 1.7 4.9 609 1192 -0.98 13 150 0.018636 0.000201 0.000796 0.000008 0.282808 0.000030 0.282806 1.3 4.5 627 1233 -0.98 17 151 0.026776 0.000433 0.001162 0.000018 0.282782 0.000023 0.282779 0.3 3.5 670 1319 -0.96 19 190 0.032803 0.000714 0.001378 0.000028 0.282904 0.000047 0.282899 4.7 8.7 499 880 -0.96 22 152 0.024753 0.000163 0.001047 0.000008 0.282518 0.000031 0.282515 -9.0 -5.8 1040 2157 -0.97 24 154 0.032726 0.000341 0.001349 0.000012 0.282720 0.000040 0.282716 -1.8 1.4 762 1515 -0.96 25 238 0.051298 0.000561 0.002218 0.000025 0.282450 0.000034 0.282440 -11.4 -6.5 1173 2282 -0.93 26 153 0.062658 0.000703 0.002614 0.000029 0.282780 0.000042 0.282772 0.3 3.4 700 1336 -0.92 29 158 0.040499 0.000318 0.001729 0.000014 0.282710 0.000039 0.282705 -2.2 1.1 784 1544 -0.95 30 155 0.041874 0.000374 0.001793 0.000018 0.282598 0.000044 0.282593 -6.1 -2.9 946 1905 -0.95
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