Chronology Constraint and Tectonic Evolution of Hanwula Early Cretaceous Ductile Shear Belt in Dong Ujimqin, Inner Mongolia
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摘要: 为研究东乌旗北部罕乌拉韧性剪切带的运动学性质及其时代,通过野外宏观调查和定向标本显微分析来研究花岗质糜棱岩的宏观-微观变形构造特征,并对经韧性剪切作用的花岗质糜棱岩进行LA-MC-ICPMS锆石U-Pb定年.研究表明花岗质糜棱岩的长石、石英等主要造岩矿物具塑性变形和动态生长的特征,发育典型的“σ”、“δ”和“S-C”组构,对研究区34组糜棱面理和线理数据进行赤平投影,剪切面(C面)平均面理产状为338°∠24°,线理产状为303°∠17°,显示出左行滑脱型韧性剪切带的特征;锆石U-Pb测年结果表明韧性剪切作用之前就位的花岗质岩石成岩年龄为135.9±1.2 Ma~130.0±0.5 Ma,属早白垩世,且该剪切带被下白垩统大磨拐河组(相当于凡兰吟期-欧特里沃期)砂砾岩覆盖.综上所述,结合最新区域研究成果认为,早白垩世(135.9±1.2 Ma~130.0±0.5 Ma)东乌旗地区经历了大规模左行伸展构造活动,这一成果深化了对该区早白垩世地壳构造演化的认识.Abstract: Through field investigation, microscopic analyses of oriented samples and zircon LA-MC-ICPMS U-Pb dating, granitic mylonites of the ducticle shear belt in Hanwula area have been studied, for their kinematic characteristics and ages. In these rocks, main rock-forming minerals (feldspar and quartz) all show the typical characteristics of plastic deformation and dynamic crystallization, with typical fabrics such as "σ", "δ" and "S-C" structures. Averages of 34 coupled attitudes of mineral lineation and shearing foliation are 338°∠24° and 303°∠17°. All the above indicate the left-lateral slip in this belt. The zircon U-Pb dating data suggest that these granitic mylonites are formed in Early Cretaceous with detail ages of 135.9±1.2 Ma to 130.0±0.5 Ma and the ductile shear belt is covered by glutenite of the Lower Cretaceous Damoguaihe Group (Valanginian-Hauterivian). Thus, we consider that Dong Ujimqin area had experienced regional left-lateral extensional structure movement in Early Cretaceous. This study filled the blank of petrology and geochronology study of the ductile shear belt in Hanwula and enhanced the understanding of the Early Cretaceous crust tectonic evolution in Dong Ujimqin.
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Key words:
- Early Cretaceous /
- ductile shear belt /
- granitic mylolite /
- tectonics /
- zircon U-Pb dating /
- geochronology
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图 2 罕乌拉韧性剪切带剖面简图(图例同图 1)
Fig. 2. The sectional drawing of ductile shear zone in Hanwula area
表 1 罕乌拉地区花岗质糜棱岩LA-MC-ICPMS锆石U-Pb同位素分析结果
Table 1. LA-MC-ICPMS zircon U-Pb dating results of granitic mylonites in Hanwula area
测点号 元素含量及比值 同位素比值 年龄(Ma) U(10-6) Th(10-6) 232Th/238U 206Pb/238U ±1σ 207Pb/235U ±1σ 207Pb/206Pb ±1σ 206Pb/238U ±1σ 207Pb/235U ±1σ 1503.1.1 771 1 176 1.525 1 0.020 4 0.000 2 0.136 1 0.004 3 0.048 4 0.001 5 130 1 130 4 1503.1.2 1 730 3 686 2.130 2 0.020 4 0.000 2 0.136 9 0.002 1 0.048 6 0.000 7 130 1 130 2 1503.1.3 902 1 135 1.258 5 0.020 6 0.000 2 0.136 7 0.002 9 0.048 2 0.001 0 131 1 130 3 1503.1.4 358 433 1.209 2 0.020 4 0.000 4 0.137 2 0.012 5 0.048 8 0.004 4 130 2 131 12 1503.1.5 636 983 1.546 6 0.020 4 0.000 2 0.137 3 0.005 0 0.048 9 0.001 8 130 1 131 5 1503.1.6 1 166 1 921 1.646 6 0.020 5 0.000 2 0.136 7 0.003 1 0.048 5 0.001 1 131 1 130 3 1503.1.7 1 814 1 169 0.644 5 0.026 3 0.000 3 0.179 6 0.002 0 0.049 6 0.000 5 167 2 168 2 1503.1.8 723 1 006 1.392 4 0.020 4 0.000 2 0.136 5 0.004 1 0.048 6 0.001 4 130 1 130 4 1503.1.9 391 620 1.587 0 0.020 7 0.000 3 0.137 6 0.012 8 0.048 2 0.004 5 132 2 131 12 1503.1.10 751 1 496 1.993 3 0.020 4 0.000 2 0.137 2 0.003 1 0.048 8 0.001 1 130 1 131 3 1503.1.11 744 1 330 1.787 2 0.020 4 0.000 2 0.136 7 0.003 9 0.048 5 0.001 4 130 1 130 4 1503.1.12 730 1 208 1.654 7 0.020 5 0.000 2 0.136 3 0.005 5 0.048 3 0.001 9 131 1 130 5 1503.1.13 829 1 507 1.818 2 0.020 5 0.000 1 0.136 8 0.003 1 0.048 5 0.001 1 131 1 130 3 1503.1.14 733 1 229 1.676 2 0.020 4 0.000 2 0.136 5 0.003 5 0.048 5 0.001 3 130 1 130 3 1503.1.15 504 653 1.295 3 0.020 2 0.000 3 0.136 3 0.011 6 0.048 9 0.004 4 129 2 130 11 1503.1.16 704 868 1.233 0 0.020 5 0.000 2 0.138 0 0.003 7 0.048 8 0.001 3 131 1 131 4 1503.1.17 673 933 1.387 3 0.020 3 0.000 2 0.137 1 0.003 7 0.049 1 0.001 3 129 1 130 4 1503.1.18 1 029 1 739 1.690 6 0.019 7 0.000 2 0.137 5 0.005 3 0.050 5 0.001 9 126 1 131 5 1503.1.19 625 39 0.062 8 0.020 4 0.000 2 0.136 6 0.006 4 0.048 6 0.002 3 130 2 130 6 1503.1.20 516 601 1.163 0 0.020 1 0.000 2 0.136 6 0.005 0 0.049 3 0.001 8 128 1 130 5 1503.1.21 486 574 1.181 6 0.020 5 0.000 3 0.136 5 0.007 5 0.048 4 0.002 6 131 2 130 7 1503.1.22 801 1 650 2.059 1 0.020 3 0.000 2 0.137 1 0.004 3 0.048 9 0.001 5 130 1 130 4 1503.1.23 1 182 2 215 1.874 7 0.020 5 0.000 2 0.136 2 0.002 7 0.048 2 0.000 9 131 1 130 3 1503.1.24 1 150 1 826 1.588 4 0.020 2 0.000 2 0.136 4 0.002 6 0.047 3 0.000 8 129 2 130 2 P19.1.1 1 688 1 295 0.767 1 0.021 4 0.000 2 0.148 2 0.002 4 0.050 3 0.000 8 136 1 140 2 P19.1.3 237 331 1.395 2 0.025 7 0.000 3 0.198 4 0.011 0 0.056 1 0.003 1 163 2 184 10 P19.1.4 1 512 929 0.614 4 0.021 1 0.000 4 0.149 2 0.002 3 0.051 3 0.000 9 135 3 141 2 P19.1.5 757 962 1.270 5 0.025 8 0.000 3 0.178 2 0.003 6 0.050 1 0.001 0 164 2 166 3 P19.1.6 2 016 2 081 1.032 4 0.021 8 0.000 3 0.148 5 0.002 0 0.049 5 0.000 8 139 2 141 2 P19.1.7 1 169 1 461 1.249 9 0.021 7 0.000 3 0.148 1 0.005 1 0.049 6 0.001 7 138 2 140 5 P19.1.8 302 149 0.494 7 0.025 6 0.000 5 0.177 5 0.009 3 0.050 3 0.002 6 163 3 166 9 P19.1.9 773 312 0.403 8 0.021 7 0.000 3 0.147 7 0.003 5 0.049 4 0.001 2 138 2 140 3 P19.1.10 1 487 1 201 0.807 7 0.021 7 0.000 2 0.148 3 0.002 3 0.049 7 0.000 7 138 1 140 2 P19.1.11 1 069 1 033 0.966 5 0.021 5 0.000 3 0.151 7 0.007 4 0.051 1 0.002 5 137 2 143 7 P19.1.12 620 594 0.957 8 0.021 8 0.000 3 0.147 8 0.005 4 0.049 2 0.001 8 139 2 140 5 P19.1.13 1 134 96 0.084 2 0.021 6 0.000 2 0.147 6 0.002 7 0.049 7 0.000 9 137 2 140 3 P19.1.14 1 147 268 0.233 5 0.021 7 0.000 2 0.148 2 0.003 3 0.049 6 0.001 1 138 1 140 3 P19.1.16 941 515 0.547 3 0.020 7 0.000 3 0.148 3 0.003 4 0.052 0 0.001 2 132 2 140 3 P19.1.17 721 1 111 1.539 6 0.021 1 0.000 2 0.147 6 0.003 7 0.050 7 0.001 3 135 2 140 4 P19.1.18 1 126 1 160 1.030 3 0.021 6 0.000 3 0.147 9 0.002 6 0.049 8 0.000 9 137 2 140 2 P19.1.19 1 988 125 0.062 8 0.021 6 0.000 2 0.146 1 0.002 0 0.049 0 0.000 6 138 2 139 2 P19.1.20 1 153 1 439 1.247 7 0.020 6 0.000 2 0.162 2 0.004 6 0.057 1 0.001 6 131 1 153 4 P19.1.21 1 996 592 0.296 5 0.025 7 0.000 3 0.178 0 0.002 4 0.050 2 0.000 7 164 2 166 2 P19.1.22 950 172 0.181 2 0.021 2 0.000 3 0.147 1 0.013 4 0.050 4 0.004 5 135 2 139 13 P19.1.23 314 157 0.498 5 0.021 7 0.000 3 0.147 4 0.012 4 0.049 4 0.004 1 138 2 140 12 P19.1.24 3 243 2 414 0.744 3 0.020 6 0.000 2 0.160 7 0.001 5 0.056 5 0.000 5 132 1 151 1 P19.1.25 1 393 875 0.628 0 0.021 6 0.000 2 0.148 8 0.002 5 0.049 9 0.000 8 138 1 141 2 P19.1.26 1 748 1 457 0.833 4 0.021 5 0.000 3 0.148 7 0.002 3 0.050 1 0.000 8 137 2 141 2 P19.1.27 794 1 016 1.280 1 0.025 6 0.000 3 0.177 4 0.005 4 0.050 3 0.001 5 163 2 166 5 P19.1.28 1 476 433 0.293 5 0.021 6 0.000 3 0.174 0 0.002 7 0.058 5 0.000 9 138 2 163 2 P19.1.29 728 892 1.225 5 0.021 1 0.000 4 0.174 1 0.003 2 0.059 7 0.001 0 135 2 163 3 P19.1.30 1 939 305 0.157 4 0.020 8 0.000 2 0.157 3 0.002 0 0.054 8 0.000 7 133 1 148 2 P19.1.31 533 137 0.257 8 0.025 6 0.000 3 0.199 2 0.005 6 0.056 5 0.001 5 163 2 184 5 P19.1.32 1 339 524 0.391 3 0.025 5 0.000 3 0.176 8 0.002 0 0.050 2 0.000 7 163 2 165 2 注:测试单位为天津地质矿产研究所. -
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