Zircon U-Pb ages, geochemical characteristics and constraints on the Bangong-Nujiang Tethys Ocean subduction of Late Jurassic-Early Cretaceous intrusive rocks from Mami area, Tibet
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摘要:
班公湖-怒江缝合带南、北两侧分布的大量中生代火成岩对约束班公湖-怒江特提斯洋演化过程具有重要意义。通过班公湖-怒江缝合带南侧麻米乡一带酸性侵入岩的锆石U-Pb年龄及地球化学特征研究，获得花岗斑岩206Pb/238U年龄加权平均值为146~145 Ma，花岗闪长岩为140 Ma，代表这套侵入岩的形成时代为晚侏罗世末期—早白垩世早期。花岗斑岩与花岗闪长岩均显示出较高的SiO2(69.12%~76.54%)和Al2O3(12.44%~14.93%)含量及较低的MgO含量(0.19%~0.89%)，属弱过铝质—强过铝质钙碱性花岗岩；同时富集大离子亲石元素Rb、K，亏损高场强元素Nb、Ta、Ti等；稀土元素总量较低(∑REE=129 ×10-6~201×10-6)，分馏程度较高(LREE/HREE=2.06~9.18)，呈现出轻稀土元素富集、重稀土元素亏损的特征，并具有负Eu异常，接近活动大陆边缘酸性岩浆岩的稀土元素配分模式。综合分析，麻米晚侏罗世—早白垩世酸性侵入岩主要来源于古老地壳物质的部分熔融，岩浆演化过程经历了分离结晶作用。这套侵入岩表现出火山弧型性质，形成于俯冲的构造背景。结合前人研究与区域资料，认为班公湖-怒江洋晚侏罗世—早白垩世存在南向俯冲，形成了区域上的措勤-申扎构造岩浆弧，进一步证实班公湖-怒江特提斯洋在晚侏罗世—早白垩世发生了双向俯冲，为特提斯的构造演化提供了新的岩石学证据。
Abstract:Large-scale Mesozoic igneous rocks distributed on the north and south sides of the Bangong - Nujiang suture zone are important in constraining the evolution of the Tethyan Ocean.This paper reports the zircon U-Pb age, major and trace geochemical characteristics of the felsic intrusive rocks in the Mami area, south of the Bangong-Nujiang suture zone.The 206Pb/238U weighted average ages of 146~145 Ma for the granitic porphyry and 140 Ma for the granitic amphibolite indicate that the intrusive rocks were emplaced during the Late Jurassic to Early Cretaceous.Both granitic porphyry and granodiorite show high content of SiO2(64.67%~77.45%), Al2O3 (12.59%~16.24%)and low MgO(0.19%~0.89%), which are weakly - strongly peraluminous calc-alkaline granite.These rocks are also enriched in large-ion lithophile elements(LILE)of Rb, K, and depletion in high field strength elements(HFSE)of Nb, Ta, Ti.The total amount of rare earth elements(REE)is low(∑REE=129 ×10-6~201×10-6), and the fractionation degree is high(LREE/HREE= 2.06~9.18).The REE patterns show enrichment in light rare earth elements(LREEs)with negative Eu anomalies, which consistent with the REE distribution patterns of felsic magmatic rocks formed on the active continental margin.Comprehensive analysis shows that the Late Jurassic-Early Cretaceous felsic intrusive rocks in Mami mainly originated from the partial melting of ancient crustal materialand and underwent fractional crystallization during the magmatic evolutionary process.Theses intrusive rocks show the characteristics of volcanic arc-type, suggesting that they formed in the background of ocean subduction.Previous studies, in combination with regional data, show that Bangong - Nujiang Ocean underwent southward subduction during the Late Jurassic to Early Cretaceous, forming the Cuoqin-Shenzha tectonic-magmatic arc.It further confirmed the bidirectional subduction of the Bangong - Nujiang Tethyan Ocean during the Late Jurassic - Early Cretaceous period, which provides new lithological evidence for the tectonic evolution of the Tethyan Ocean.
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表 1 麻米乡酸性侵入岩LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS zircon U-Th-Pb analyses results of the felsic intrusive rocks in Mami area
测点号 含量/10-6 Th/U 同位素比值 U-Pb年龄/Ma 谐和度 Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D2247TW 2 96 234 183 1.27 0.0477 0.0018 0.1483 0.0056 0.0226 0.0003 83.4 89 140 5 144 2 97% 5 79 175 155 1.13 0.0514 0.0018 0.1682 0.0067 0.0236 0.0003 257 86 158 6 151 2 95% 6 157 389 318 1.22 0.0475 0.0014 0.1520 0.0049 0.0232 0.0002 72.3 -129 144 4 148 2 97% 7 90 217 197 1.10 0.0526 0.0022 0.1694 0.0069 0.0235 0.0003 309 127 159 6 150 2 94% 10 160 367 344 1.07 0.0466 0.0014 0.1540 0.0049 0.0240 0.0003 27.9 70 145 4 153 2 95% 11 111 269 263 1.02 0.0471 0.0014 0.1532 0.0049 0.0236 0.0002 50.1 74 145 4 151 1 96% 12 158 405 331 1.22 0.0490 0.0015 0.1496 0.0045 0.0222 0.0002 150 70 142 4 141 1 99% 13 103 252 262 0.96 0.0501 0.0016 0.1580 0.0049 0.0230 0.0003 211 72 149 4 146 2 98% 14 93 219 217 1.01 0.0504 0.0018 0.1625 0.0056 0.0235 0.0002 213 81 153 5 150 2 97% 15 38.7 92.6 128 0.73 0.0490 0.0022 0.1500 0.0066 0.0225 0.0003 146 107 142 6 143 2 98% 16 133 345 289 1.20 0.0504 0.0017 0.1550 0.0054 0.0223 0.0003 213 84 146 5 142 2 97% 17 93 232 172 1.35 0.0509 0.0019 0.1587 0.0058 0.0227 0.0003 239 85 150 5 145 2 96% 18 109 268 272 0.99 0.0476 0.0016 0.1502 0.0053 0.0229 0.0003 80 87 142 5 146 2 97% 19 96 242 190 1.28 0.0473 0.0017 0.1490 0.0054 0.0229 0.0003 64.9 85 141 5 146 2 96% 20 71 181 131 1.38 0.0432 0.0020 0.1358 0.0064 0.0228 0.0003 - - 129 6 146 2 88% 21 172 449 265 1.69 0.0493 0.0016 0.1493 0.0047 0.0221 0.0002 161 74 141 4 141 1 99% 23 135 334 245 1.36 0.0478 0.0017 0.1524 0.0053 0.0232 0.0003 100 83 144 5 148 2 97% PM005-3TW2 1 16.6 202 107 1.89 0.0474 0.0022 0.1551 0.0077 0.0233 0.0003 77.9 98 146 7 149 2 98% 3 20.7 229 209 1.10 0.0500 0.0018 0.1565 0.0057 0.0228 0.0003 195 85 148 5 145 2 98% 4 17.1 210 130 1.61 0.0505 0.0020 0.1539 0.0063 0.0220 0.0003 217 93 145 6 141 2 96% 5 12.2 112 151 0.74 0.0485 0.0018 0.1522 0.0058 0.0228 0.0003 124 89 144 5 145 2 99% 6 9.0 87.7 70.8 1.24 0.0553 0.0030 0.1739 0.0096 0.0229 0.0004 433 122 163 8 146 2 89% 7 33.7 393 228 1.73 0.0530 0.0018 0.1685 0.0057 0.0231 0.0003 328 106 158 5 147 2 92% 8 18.3 214 168 1.28 0.0482 0.0020 0.1487 0.0062 0.0222 0.0003 109 103 141 6 142 2 99% 9 30.1 322 310 1.04 0.0498 0.0016 0.1582 0.0051 0.0229 0.0003 187 76 149 4 146 2 98% 10 32.1 369 285 1.30 0.0492 0.0018 0.1580 0.0059 0.0232 0.0003 167 82 149 5 148 2 99% 11 16.4 200 112 1.79 0.0488 0.0030 0.1544 0.0103 0.0226 0.0003 200 76 146 9 144 2 99% 12 21.9 269 162 1.66 0.0454 0.0019 0.1364 0.0055 0.0221 0.0002 - 130 5 141 2 91% 14 22.7 253 189 1.34 0.0553 0.0023 0.1816 0.0089 0.0235 0.0003 433 94 169 8 150 2 87% 15 20.4 252 119 2.13 0.0538 0.0024 0.1646 0.0073 0.0224 0.0003 361 100 155 6 143 2 91% 18 16.2 167 137 1.22 0.0462 0.0022 0.1490 0.0073 0.0236 0.0003 9.4 111 141 6 150 2 93% 19 12.0 145 90.2 1.60 0.0518 0.0025 0.1626 0.0075 0.0231 0.0003 276 109 153 7 148 2 96% 20 40.3 446 408 1.09 0.0467 0.0013 0.1472 0.0047 0.0228 0.0003 35.3 67 139 4 145 2 95% 22 28.8 334 167 1.99 0.0568 0.0028 0.1843 0.0100 0.0232 0.0003 483 111 172 9 148 2 85% 23 40.6 422 456 0.93 0.0474 0.0015 0.1516 0.0060 0.0232 0.0005 77.9 65 143 5 148 3 97% 24 17.6 177 210 0.85 0.0470 0.0018 0.1524 0.0059 0.0237 0.0003 55.7 144 144 5 151 2 95% D2264TW 2 49.8 130 118 1.10 0.0442 0.0022 0.1312 0.0061 0.0220 0.0003 - - 125 6 140 2 88% 3 158 405 258 1.57 0.0533 0.0015 0.1611 0.0048 0.0219 0.0002 343 65 152 4 140 2 91% 4 95 241 200 1.21 0.0489 0.0017 0.1516 0.0056 0.0225 0.0003 143 86 143 5 143 2 99% 5 64 161 131 1.23 0.0462 0.0019 0.1424 0.0060 0.0225 0.0003 5.7 100 135 5 144 2 94% 6 68 165 136 1.21 0.0533 0.0022 0.1683 0.0072 0.0228 0.0003 343 88 158 6 145 2 91% 7 144 378 275 1.38 0.0508 0.0017 0.1576 0.0052 0.0225 0.0002 235 78 149 5 143 1 96% 8 81 221 174 1.27 0.0491 0.0021 0.1512 0.0065 0.0225 0.0003 154 97 143 6 144 2 99% 16 76 199 151 1.32 0.0501 0.0024 0.1502 0.0075 0.0217 0.0003 198 113 142 7 138 2 97% 17 85 228 151 1.51 0.0506 0.0023 0.1514 0.0069 0.0217 0.0003 233 104 143 6 139 2 96% 18 110 287 186 1.54 0.0517 0.0020 0.1554 0.0056 0.0220 0.0002 333 82 147 5 140 2 95% 19 117 324 170 1.90 0.0519 0.0020 0.1519 0.0055 0.0215 0.0003 280 87 144 5 137 2 95% 20 105 281 203 1.39 0.0515 0.0022 0.1574 0.0072 0.0222 0.0003 265 101 148 6 142 2 95% 21 85 238 205 1.16 0.0538 0.0018 0.1530 0.0055 0.0206 0.0003 361 76 145 5 132 2 90% 22 86 227 222 1.03 0.0492 0.0019 0.1410 0.0054 0.0209 0.0003 167 95 134 5 133 2 99% 注：-表示不谐和年龄 
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表 2 麻米乡酸性侵入岩主量、微量和稀土元素数据
Table 2. Major, trace and rare earth elements compositions of acid intrusive rocks in Mami area
元素 毒古隆花岗斑岩(PM005) 鲁备雄花岗闪长岩(PM008) 2Gs1 2Gs2 3Gs1 3Gs2 4Gs1 5Gs1 5Gs2 6Gs1 6Gs2 7Gs1 7Gs2 7Gs3 8Gs1 9Gs1 10Gs2 2Gs1 2Gs2 3GS1 3GS2 3GS3 SiO2 73.48 74.79 72.51 74.74 75.46 73.80 73.16 74.67 73.08 76.54 75.36 74.93 74.22 72.34 70.60 69.76 69.27 69.12 69.64 69.90 TiO2 0.26 0.21 0.30 0.23 0.18 0.23 0.29 0.20 0.27 0.18 0.18 0.19 0.22 0.31 0.38 0.41 0.44 0.42 0.42 0.41 Al2O3 13.47 12.76 13.67 12.90 12.90 13.11 13.28 12.76 13.46 12.44 12.55 12.75 13.06 13.47 14.58 14.74 14.93 14.66 14.79 14.88 Fe2O3 0.98 0.68 1.00 0.73 0.59 0.79 0.88 0.78 0.79 0.76 0.79 0.71 0.79 1.18 1.25 1.08 1.29 1.24 1.24 1.28 FeO 1.13 1.43 1.40 1.23 0.92 1.75 1.85 1.48 1.90 0.97 1.16 1.45 1.39 1.75 1.90 2.40 2.29 2.33 1.97 1.87 MnO 0.08 0.06 0.08 0.08 0.06 0.08 0.08 0.07 0.08 0.06 0.06 0.07 0.06 0.09 0.07 0.09 0.09 0.08 0.12 0.09 MgO 0.52 0.37 0.62 0.40 0.29 0.45 0.67 0.32 0.57 0.19 0.29 0.30 0.45 0.71 0.66 0.86 0.89 0.85 0.87 0.82 CaO 1.23 0.81 2.13 1.41 1.08 1.55 1.24 1.21 1.30 0.24 0.64 0.75 0.82 1.59 1.46 2.57 2.80 2.74 2.60 2.68 Na2O 3.31 3.09 3.27 3.18 3.12 3.28 3.32 3.01 3.19 2.40 2.97 3.11 3.18 3.48 3.78 4.07 4.00 4.03 3.95 3.96 K2O 4.33 4.62 3.80 4.27 4.64 4.17 3.79 4.69 4.14 4.82 4.97 4.74 4.60 3.88 3.54 2.84 2.66 2.77 2.88 2.92 P2O5 0.05 0.04 0.07 0.05 0.04 0.04 0.07 0.04 0.05 0.03 0.03 0.04 0.04 0.07 0.09 0.12 0.15 0.14 0.13 0.13 烧失量 0.93 0.92 0.94 0.58 0.56 0.53 1.16 0.58 0.98 1.18 0.82 0.79 0.99 0.92 1.44 0.83 0.95 1.40 1.16 0.86 H2O+ 0.78 0.76 0.84 0.41 0.41 0.58 0.91 0.45 0.83 1.01 0.68 0.67 0.90 0.79 1.10 0.60 0.67 0.88 0.86 0.64 H2O- 0.06 0.09 0.08 0.04 0.05 0.08 0.13 0.08 0.13 0.12 0.09 0.07 0.14 0.04 0.02 0.03 0.04 0.04 0.03 0.06 CO2 0.09 0.10 0.09 0.09 0.06 0.06 0.22 0.09 0.08 0.10 0.09 0.07 0.07 0.08 0.20 0.08 0.13 0.33 0.17 0.16 总计 99.78 99.82 99.86 99.76 99.79 99.97 99.90 99.84 99.87 99.87 99.86 99.84 99.94 99.78 99.63 99.66 99.65 99.63 99.66 99.81 Sc 5.09 4.44 6.59 5.63 5.04 5.54 7.14 4.56 5.58 4.02 4.4 4.44 5.44 5.8 7.06 6.68 7.45 6.6 6.81 6.84 V 23.9 19.2 34.3 22.0 16.2 23.0 37.0 19.6 30.4 15.2 15.3 17.8 21.9 29.8 46.6 30.9 32.4 28.2 28.8 30.1 Cr 10.8 8.96 10.2 10.4 9.28 8.64 10.0 8.28 8.78 9.40 7.76 8.92 11.1 8.24 9.98 8.83 21.0 12.8 8.46 8.34 Co 2.84 2.04 3.62 2.71 2.48 2.50 4.08 2.10 3.58 1.51 1.82 2.34 2.63 3.21 4.88 4.24 4.18 3.62 4.36 3.18 Ni 3.21 2.53 3.68 2.74 2.18 2.16 3.36 2.56 4.18 2.30 2.46 3.06 3.32 2.61 3.79 3.38 3.93 3.10 2.81 2.54 Cu 12.6 6.34 10.9 6.7 8.71 4.35 6.30 5.14 8.32 6.04 5.74 10.6 6.38 5.30 7.11 8.78 8.53 7.82 7.60 6.54 Rb 200 233 176 198 244 210 160 220 194 202 251 240 211 186 174 113 122 122 123 115 Sr 99.7 75.0 158 115 91.6 116 164 81.3 126 54.8 58.8 64.7 91.0 108 177 232 247 242 231 242 Zr 125 112 147 113 108 113 153 108 132 104 104 101 119 131 151 168 192 158 172 172 Nb 11.1 10.3 12.6 11.7 10.4 12.3 11.9 11.1 10.9 8.88 12.0 12.3 12.5 11.1 10.4 9.94 10.3 9.24 11.6 9.83 Ba 372 362 513 392 343 438 457 338 432 351 268 276 350 402 502 426 456 409 428 454 Hf 4.00 3.71 4.86 3.74 3.48 3.78 4.84 3.74 4.34 4.00 3.88 3.50 3.92 4.29 4.53 4.92 4.90 4.90 5.46 4.81 Ta 1.06 1.00 1.01 1.14 1.11 1.13 0.92 1.10 1.04 0.72 1.08 1.13 1.15 1.20 1.04 1.07 0.82 0.98 0.90 0.85 Th 27.0 29.4 22.8 28.2 30.4 24.6 18.8 29.6 27.0 32.2 30.4 27.6 28.3 22.2 24.5 13.8 13.0 14.0 13.6 14.8 U 2.00 3.99 2.90 3.90 3.50 3.94 3.58 4.32 1.78 2.45 2.88 3.48 3.31 3.03 3.03 2.12 2.20 3.08 3.09 2.86 W 0.62 1.44 0.56 2.39 2.80 0.70 0.62 0.46 5.16 1.36 0.85 1.00 1.29 1.01 1.33 0.61 0.83 2.78 0.77 0.78 Sn 3.40 1.72 3.35 2.64 2.23 2.50 2.62 2.25 3.20 1.72 1.36 2.34 2.53 2.50 2.98 2.65 2.95 2.76 3.14 2.48 Ag 0.15 0.1 0.04 0.04 0.16 0.04 0.05 0.04 0.04 0.05 0.06 0.06 0.05 0.05 0.06 0.08 0.09 0.06 0.08 0.06 Au 0.54 0.4 0.48 0.38 0.56 0.37 0.40 0.42 0.52 0.57 0.38 0.52 0.65 0.70 0.70 0.62 0.71 0.68 0.69 0.75 La 29.5 33.6 35.3 32.2 36.4 32.2 30.7 35.0 34.6 35.0 27.2 26.5 33.6 43.3 36.2 32.6 24.5 27.1 24.5 25.1 Ce 63.3 61.8 69.2 58.7 61.4 58.2 60.6 60.9 64.5 62.3 61.5 55.5 64.6 74.8 69.3 64.4 53.6 54.0 52.2 52.0 Pr 5.83 5.87 7.44 5.74 5.68 5.78 6.80 5.90 6.54 5.72 4.29 4.89 6.25 7.34 7.30 7.27 6.57 6.25 6.49 6.35 Nd 19.3 18.6 25.6 18.5 17.4 18.8 24.2 18.5 21.7 17.4 12.9 15.6 20.2 23.9 24.5 26.4 24.8 22.9 24.6 24.0 Sm 3.46 3.17 4.80 3.27 2.76 3.30 4.61 3.19 3.89 2.72 2.05 2.67 3.60 4.35 4.35 5.01 4.93 4.50 5.07 4.82 Eu 0.72 0.66 1.09 0.69 0.60 0.74 1.02 0.61 0.84 0.52 0.43 0.53 0.74 0.89 1.01 1.17 1.22 1.21 1.14 1.20 Gd 3.60 2.95 4.72 3.32 2.88 3.50 4.55 3.26 3.92 2.48 2.13 2.88 3.74 4.29 4.31 4.79 4.55 4.28 4.83 4.56 Tb 0.66 0.45 0.90 0.59 0.49 0.64 0.85 0.58 0.72 0.30 0.33 0.52 0.66 0.77 0.75 0.87 0.86 0.83 0.93 0.86 Dy 3.92 2.35 5.26 3.57 2.84 3.71 5.08 3.48 4.33 1.28 1.82 3.11 4.02 4.62 4.42 5.2 5.07 4.85 5.53 5.03 Ho 0.86 0.49 1.11 0.77 0.62 0.81 1.06 0.75 0.93 0.24 0.40 0.70 0.88 0.98 0.94 1.10 1.03 1.02 1.18 1.05 Er 2.52 1.52 3.29 2.32 1.95 2.50 3.10 2.34 2.77 0.76 1.30 2.21 2.71 2.92 2.70 3.15 2.93 2.91 3.43 3.08 Tm 0.46 0.28 0.57 0.43 0.36 0.46 0.53 0.43 0.49 0.14 0.28 0.42 0.50 0.49 0.47 0.52 0.50 0.49 0.60 0.52 Yb 3.18 2.03 3.77 3.08 2.67 3.11 3.47 3.15 3.38 1.18 2.24 3.05 3.51 3.38 3.13 3.47 3.22 3.14 4.05 3.40 Lu 0.55 0.37 0.61 0.54 0.48 0.54 0.56 0.55 0.57 0.24 0.43 0.53 0.61 0.58 0.50 0.56 0.52 0.51 0.66 0.55 Y 25.1 13.8 32.6 23.2 19.0 24.3 30.5 23.2 27.5 6.85 12.0 22.4 27.3 28.6 27.3 29.8 29.4 28.8 34.0 29.5 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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