Geochronology and geochemistry of the Middle Triassic magmatic rocks in the southeastern part of the Da Hinggan Mountains and their constraints on the tectonic evolution of Paleo-Asian Ocean
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摘要:
大兴安岭东南缘扎赉特旗老山门地区新发现了中三叠世中基性火山岩和花岗岩。锆石U-Pb定年结果显示安山岩喷出年龄为238.8±1.8 Ma，花岗岩结晶年龄为242.2±2.1 Ma。中基性火山岩属于高钾钙碱性系列，为偏铝质，A/CNK值为0.92~0.97，Mg#值为41~45，稀土元素配分图和微量元素蛛网图右倾明显，基本无负Eu异常，高场强元素Nb、P、Ti亏损，稀土元素总量为120.61×10-6~130.19×10-6，具典型的大陆岩石圈地幔受俯冲板片作用影响改造后的特征。花岗岩为I-A过渡型花岗岩，属高钾钙碱性系列，总体为弱过铝质，A/CNK值为0.91~1.17，稀土元素配分图和微量元素蛛网图右倾明显，可见明显Ba、Nb、Sr、P、Ti、Eu负异常，稀土元素总量偏低，为81.24×10-6~290.52×10-6。老山门中基性火山岩来源于较深的原始地幔，源区岩浆在上涌过程中经过强烈的分离结晶作用，并受到一定程度的地壳混染。而老山门侵入岩为上涌的中基性岩浆加热下地壳形成。老山门中三叠世中基性火山岩和花岗岩形成于古亚洲洋碰撞-后碰撞-拉张的转换期，时间为240~220 Ma，属于碰撞造山作用演化晚期的区域性挤压为主并逐渐转为弧后伸展的构造环境。
Abstract:Middle Triassici ntermediate-basic volcanic rocks and contemporaneous granite in the Laoshanmen area on the southeastern margin of the Da Hinggan Mountains were identified.Zircon U-Pb dating results show an eruption age of 238.8±1.8 Ma for the andesite and a crystallization age of 242.2±2.1 Ma for the granite.The intermediate-basic volcanic rock samples belong to the high potassium calc-alkaline series, and are aluminous, with A/CNK being 0.92~0.97 and Mg# being 41~45.Their chondrite and primitive mantle normalized REE patterns and spidergrams show no negative Eu anomaly but significant depletion of high field strength elements, such as Nb, P and Ti (Nb*= 0.19~0.39;Eu*=0.89~0.99).These are typical characteristics of continental lithospheric mantle modified by plate subduction action.The granite samples are weakly peraluminous I to A type transitional granite, and belong to high potassium calc-alkaline series, with A/CNK being 0.91~1.17 and Eu* being 0.06 ~ 0.66.These observations indicate that the Laoshanmen intermediate-basic volcanic rocks originated from the deep primitive mantle source, which underwent strong fractional crystallization during upwelling and was contaminated by the crust.The granites were formed by the lower crust which was heated by the upwelling intermediate-basic magma.They were formed in the transitional period of collision-post collision-extension in the Paleo-Asian Ocean, which lasted from 240~220 Ma and belonged to the tectonic environment of regional compression in the late evolution of collision orogeny and gradually turned into back-arc extension.
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表 1 样品PM13TW11和TW4377锆石U-Th-Pb同位素分析数据
Table 1. PM13TW11 and TW4377 analytical results of zircon U-Th-Pb isotope
样品号 含量/10-6 同位素比值 年龄/Ma PM13
TW11Pb U Th 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 232Th/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 17 473 180 0.03646 0.00028 0.24876 0.00445 0.04952 0.00073 0.01142 0.00014 0.38981 0.00038 231 1.22 226 2.18 172 1.91 2 10 246 117 0.03713 0.00029 0.28763 0.00862 0.05645 0.00160 0.01246 0.00019 0.48664 0.00155 235 1.22 257 3.24 470 3.08 3 7 172 55 0.03936 0.00035 0.32504 0.01052 0.05944 0.00176 0.01362 0.00031 0.33177 0.00042 249 1.30 286 3.47 583 3.20 4 14 374 154 0.03720 0.00028 0.25674 0.00514 0.05003 0.00086 0.01187 0.00014 0.42349 0.00067 235 1.20 232 2.35 196 2.11 5 10 271 112 0.03790 0.00029 0.24479 0.00642 0.04687 0.00113 0.01175 0.00016 0.42249 0.00085 240 1.21 222 2.90 43 2.70 6 7 169 85 0.03899 0.00034 0.25622 0.01152 0.04766 0.00206 0.01278 0.00021 0.51642 0.00297 247 1.28 232 4.66 82 4.50 7 19 475 193 0.03839 0.00033 0.26981 0.00499 0.05098 0.00075 0.01254 0.00016 0.41571 0.00168 243 1.27 243 2.23 240 1.91 8 9 219 98 0.03957 0.00033 0.27084 0.00837 0.04968 0.00142 0.01277 0.00019 0.45771 0.00072 250 1.26 243 3.33 180 3.09 9 15 393 162 0.03642 0.00027 0.25944 0.00514 0.05165 0.00087 0.01168 0.00015 0.42241 0.00040 231 1.19 234 2.34 270 2.07 10 23 529 407 0.03903 0.00033 0.27450 0.00457 0.05109 0.00065 0.01243 0.00015 0.78870 0.00286 247 1.27 246 2.08 245 1.76 11 12 294 112 0.03871 0.00031 0.27795 0.00672 0.05218 0.00114 0.01208 0.00017 0.39079 0.00065 245 1.23 249 2.72 293 2.50 12 31 809 394 0.03687 0.00028 0.25421 0.00350 0.05003 0.00047 0.01144 0.00012 0.49995 0.00079 233 1.21 230 1.85 196 1.54 13 18 433 192 0.03898 0.00032 0.28045 0.00493 0.05222 0.00074 0.01234 0.00015 0.45405 0.00052 247 1.25 251 2.15 295 1.87 14 7 183 63 0.03847 0.00030 0.31305 0.01069 0.05885 0.00188 0.01346 0.00028 0.35359 0.00048 243 1.22 277 3.63 562 3.41 15 17 438 216 0.03655 0.00028 0.24987 0.00459 0.04969 0.00078 0.01116 0.00013 0.50524 0.00071 231 1.21 226 2.22 181 1.99 16 15 386 167 0.03796 0.00031 0.25631 0.00514 0.04901 0.00084 0.01164 0.00015 0.44302 0.00072 240 1.24 232 2.36 148 2.09 17 14 343 142 0.03894 0.00032 0.26679 0.00544 0.04971 0.00086 0.01197 0.00016 0.42408 0.00037 246 1.25 240 2.39 182 2.12 18 24 605 281 0.03787 0.00030 0.26058 0.00417 0.04993 0.00063 0.01157 0.00013 0.47585 0.00028 240 1.22 235 2.03 192 1.74 19 35 959 416 0.03586 0.00025 0.24977 0.00326 0.05052 0.00045 0.01059 0.00011 0.44467 0.00134 227 1.17 226 1.80 219 1.50 20 13 332 152 0.03812 0.00030 0.27241 0.00553 0.05185 0.00092 0.01168 0.00015 0.46799 0.00214 241 1.23 245 2.38 279 2.14 21 12 300 142 0.03740 0.00029 0.26496 0.00595 0.05138 0.00103 0.01117 0.00013 0.48717 0.00105 237 1.22 239 2.57 258 2.35 22 13 308 151 0.03988 0.00041 0.32038 0.00887 0.05712 0.00119 0.01413 0.00033 0.50311 0.00374 252 1.40 282 3.03 496 2.40 23 35 892 345 0.03823 0.00032 0.25859 0.00346 0.04909 0.00042 0.01144 0.00013 0.39714 0.00051 242 1.26 234 1.82 152 1.48 24 28 764 367 0.03554 0.00027 0.25041 0.00338 0.05115 0.00049 0.01022 0.00011 0.49244 0.00140 225 1.20 227 1.83 247 1.54 25 25 647 295 0.03768 0.00031 0.27035 0.00388 0.05207 0.00053 0.01122 0.00013 0.46767 0.00106 238 1.24 243 1.90 288 1.58 26 31 879 329 0.03467 0.00024 0.24596 0.00328 0.05145 0.00047 0.01000 0.00010 0.38404 0.00068 220 1.18 223 1.82 261 1.52 27 9 248 89 0.03571 0.00028 0.29155 0.00724 0.05936 0.00135 0.01016 0.00016 0.36958 0.00020 226 1.22 260 2.78 580 2.58 样品号 含量/10-6 同位素比值 年龄/Ma TW4377 Pb U Th 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 208Pb/232Th 1σ 232Th/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 1 28 688 536 0.03765 0.00022 0.25841 0.00265 0.04978 0.00042 0.01025 0.00027 0.79898 0.00700 238 1.10 233 1.61 185 1.47 2 31 726 505 0.03893 0.00023 0.28026 0.00274 0.05222 0.00042 0.01217 0.00030 0.71341 0.00285 246 1.10 251 1.58 295 1.45 3 21 439 443 0.03867 0.00025 0.30554 0.00618 0.05658 0.00087 0.01267 0.00031 1.03450 0.01003 245 1.14 271 2.37 475 1.96 4 20 470 330 0.03956 0.00027 0.26839 0.00376 0.04935 0.00063 0.01029 0.00025 0.71975 0.00337 250 1.16 241 1.87 165 1.75 5 15 369 179 0.03748 0.00018 0.28381 0.00434 0.05497 0.00079 0.01235 0.00035 0.49766 0.00092 237 1.05 254 1.97 411 1.89 6 17 417 281 0.03764 0.00020 0.27766 0.00373 0.05360 0.00070 0.01221 0.00029 0.69075 0.00147 238 1.08 249 1.83 354 1.78 7 15 355 297 0.03707 0.00018 0.26629 0.00410 0.05221 0.00078 0.01199 0.00027 0.85805 0.00149 235 1.06 240 1.98 294 1.93 8 20 459 350 0.03790 0.00016 0.27549 0.00354 0.05267 0.00062 0.01241 0.00029 0.78167 0.01576 240 1.03 247 1.79 315 1.69 9 31 612 824 0.03830 0.00023 0.27190 0.00333 0.05138 0.00049 0.01282 0.00033 1.38014 0.00744 242 1.12 244 1.74 258 1.54 10 21 495 352 0.03807 0.00021 0.26817 0.00374 0.05104 0.00063 0.01277 0.00035 0.72803 0.00143 241 1.09 241 1.87 243 1.73 11 25 588 359 0.03936 0.00026 0.28860 0.00354 0.05310 0.00051 0.01302 0.00039 0.62585 0.00400 249 1.15 257 1.74 333 1.55 12 17 406 300 0.03781 0.00018 0.25912 0.00342 0.04977 0.00064 0.01259 0.00037 0.75695 0.00109 239 1.05 234 1.81 184 1.76 13 18 383 350 0.03871 0.00020 0.29054 0.00461 0.05441 0.00080 0.01379 0.00036 0.93758 0.00945 245 1.07 259 2.01 388 1.90 14 14 323 260 0.03861 0.00019 0.27120 0.00470 0.05103 0.00086 0.00994 0.00024 0.82569 0.00715 244 1.06 244 2.13 242 2.07 15 16 385 235 0.03896 0.00022 0.29037 0.00442 0.05402 0.00075 0.01286 0.00030 0.62495 0.00072 246 1.10 259 1.96 372 1.85 16 17 413 247 0.03828 0.00017 0.26266 0.00381 0.04974 0.00068 0.01268 0.00028 0.61454 0.00112 242 1.04 237 1.91 183 1.83 17 30 699 512 0.03892 0.00021 0.27664 0.00252 0.05159 0.00040 0.01163 0.00027 0.75246 0.00585 246 1.09 248 1.54 267 1.44 18 20 459 315 0.03894 0.00021 0.27138 0.00406 0.05046 0.00067 0.01237 0.00030 0.70378 0.00111 246 1.08 244 1.94 216 1.80 19 34 807 614 0.03757 0.00017 0.27124 0.00260 0.05226 0.00039 0.01169 0.00029 0.78002 0.00224 238 1.05 244 1.57 297 1.42 
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表 2 老山门火山岩及侵入岩主量、微量和稀土元素分析结果
Table 2. Analytical results of major, trace elements and REE for the Laoshanmen volcanic rocks and granites
样品号 PM12GS3 GS3915 GS1648 GS6240 GS5534 GS1663 GS2408 GS6447 GS6268 GS8238 PM12GS15 PM24GS3 GS5188 GS8048 PM13GS8 PM13GS11 PM13GS20 SiO2 73.77 75.6 74.73 75.03 74.95 76.58 68.17 77.23 68.84 71.97 68.46 69.01 66.9 69.36 60.92 57.64 55.82 Al2O3 13.49 12.96 13.18 13 12.99 13.08 14.67 12.31 14.87 13.99 14.28 14.73 15.17 14.71 16.8 18.72 18.37 Fe2O3 1.51 1.44 1.39 1.42 1.39 0.73 3.8 0.79 3.28 1.76 2.82 2.59 3.82 2.62 4.39 4.7 5.44 FeO 0.21 0.16 0.42 0.37 0.16 0.099 0.5 0.17 0.071 0.052 0.071 0.67 0.36 0.51 1.37 1.9 2.05 CaO 0.73 0.21 0.38 0.42 0.74 0.27 0.96 0.39 1.63 1.62 2.95 1.7 2.06 2.11 4.41 6.1 6.68 MgO 0.23 0.08 0.14 0.08 0.14 0.059 0.83 0.21 0.78 0.5 0.6 0.85 0.99 0.78 2.08 1.97 2.31 K2O 4.96 5.48 5.12 5.64 5.1 5.4 4.23 4.17 4.19 4.5 4.2 4.23 4.2 4.47 2.66 1.87 1.91 Na2O 3.87 3.75 3.56 3.3 3.85 3.68 3.75 4.06 3.54 3.72 3.55 3.5 4.01 4.19 3.9 4.02 3.54 TiO2 0.25 0.15 0.17 0.14 0.15 0.13 0.49 0.14 0.54 0.29 0.45 0.53 0.71 0.54 0.71 1.01 1.2 P2O5 0.082 0.016 0.031 0.022 0.017 0.011 0.18 0.031 0.18 0.093 0.12 0.17 0.23 0.17 0.24 0.3 0.3 MnO 0.036 0.026 0.025 0.025 0.031 0.012 0.06 0.028 0.045 0.036 0.047 0.05 0.07 0.059 0.08 0.1 0.12 烧失量 0.84 0.73 0.8 0.52 1.09 0.66 2.09 0.45 2.02 1.47 2.44 1.9 1.77 0.87 2.3 1.5 2.02 La 49.3 23.2 45.1 47 39.3 30.1 46.9 17.4 36.6 30.6 29.1 37.5 54.5 40.2 21.9 19.2 19.4 Ce 79.9 50 107 138 87.1 57.6 102 32.2 76 51.8 60.6 84.5 109 83.3 43.1 34.4 34.8 Pr 11.3 5.55 11.1 11.4 10.6 7.21 11.8 3.52 9.96 6.76 7.06 10.5 13.2 9.84 5.8 5.49 5.71 Nd 40.6 19.2 39 39.8 42.3 25.8 43.2 11.9 38.5 23.7 26.1 40.9 48.6 36.2 23.8 22.9 24.7 Sm 6.84 3.54 6.9 6.54 7.99 4.52 7.93 2.02 7.49 4.31 4.82 7.97 8.69 6.66 4.65 4.74 5.32 Eu 0.5 0.093 0.21 0.14 0.43 0.084 1.2 0.36 1.15 0.74 0.97 1.22 1.44 1.12 1.25 1.45 1.53 Gd 5.94 4.67 5.83 5.47 7.68 4.6 7.02 1.87 6.64 3.9 4.15 7.02 8.69 6.82 3.97 4.2 4.6 Tb 0.89 0.68 0.86 0.74 1.02 0.59 1.13 0.29 1.08 0.63 0.62 1.16 1.16 0.93 0.62 0.67 0.77 Dy 4.67 4.19 4.4 3.62 5.15 2.98 6.53 1.57 6.17 3.55 3.3 6.41 6.05 4.92 3.42 3.75 4.44 Ho 0.87 0.85 0.79 0.64 0.98 0.54 1.07 0.31 1.17 0.69 0.63 1.24 1.19 1 0.65 0.73 0.85 Er 2.21 2.22 2.02 1.54 2.62 1.47 3.63 0.88 3.16 2.06 1.72 3.62 3.29 2.8 1.72 1.89 2.17 Tm 0.34 0.31 0.3 0.22 0.36 0.2 0.59 0.14 0.49 0.32 0.28 0.55 0.49 0.42 0.25 0.29 0.33 Yb 2.3 1.81 2.02 1.31 2.22 1.2 3.7 0.95 3.4 2.1 1.91 3.51 3.13 2.68 1.79 2 2.31 Lu 0.33 0.26 0.3 0.19 0.32 0.18 0.58 0.14 0.5 0.32 0.3 0.52 0.49 0.41 0.27 0.3 0.36 Y 21.1 19.1 17.4 13.4 19.9 12.3 40.3 7.69 31 19.5 17.2 32.4 30.6 25.7 17 18.6 21.7 Rb 124 192 144 132 130 167 133 117 119 133 129 125 108 118 60.6 31.3 26.6 K 41157.45 45472.34 42485.11 46800 44808.51 44808.51 35100 34602.13 34768.09 37340.43 34851.06 35100 34851.06 37091.49 22072.34 15517.02 15848.94 Ba 394 56 138 66 206 42.2 765 591 717 683 857 713 735 592 751 660 619 Th 13.3 14.7 15.6 20.8 14.2 13.5 11.5 9.95 17.9 16.3 13.9 15.4 12.5 17.4 4.99 2.86 2.64 U 1.46 4.42 1.49 1.72 3.8 2.05 1.46 0.99 2.24 1.61 1.8 2.14 2.13 2.18 Nb 13.1 19.3 14.6 12.9 10.3 15.5 9.22 13.2 14.6 10.3 8.43 14.3 15.1 13.7 6.15 6.42 8.32 Sr 86 12.6 46.3 31 55 12 208 89.2 271 215 304 275 367 323 573 596 524 P 217.26 42.39 82.14 58.29 45.04 29.15 476.92 82.14 476.92 246.41 317.95 450.43 609.4 450.43 635.9 794.87 794.87 Zr 269 256 260 240 184 191 211 105 284 159 216 282 346 266 178 166 184 Hf 8.51 8.84 9.24 8.94 5.76 6.82 5.67 3.83 8.15 5.3 6.72 8.45 9.6 7.07 5.14 4.72 4.63 Ti 1498.75 899.25 1019.15 839.3 899.25 779.35 2937.55 839.3 3237.3 1738.55 2697.75 3177.35 4256.45 3237.3 4256.45 6054.94 7193.99 Cr 4.74 3.3 3.2 3.14 6.16 3.41 10.6 3.56 14 16.6 10.9 13.5 20.7 15.6 19 3.53 6.76 Co 2.24 0.55 1.67 1.44 1.06 0.22 4.96 1.64 5.89 3.41 5.7 6.15 7.41 5.2 13.3 14 16.7 Ni 4.41 2.42 6.32 3.55 7.6 2.56 19.9 1.9 9.51 10.9 5.98 9.15 11.6 9.16 8.95 6.24 4.99 A/CNK 1.03 1.04 1.09 1.06 0.98 1.06 1.17 1.03 1.12 1.00 0.91 1.10 1.02 0.95 0.97 0.95 0.92 Na2O+K2O 8.83 9.23 8.68 8.94 8.95 9.08 7.98 8.23 7.73 8.22 7.75 7.73 8.21 8.66 6.56 5.89 5.45 Mg# 23.5 10.3 14.9 9.24 17.2 14.1 30.8 33.3 35.1 39.1 32.5 37.3 35.3 36.3 45.1 40.3 41.1 Eu* 0.24 0.07 0.10 0.07 0.17 0.06 0.49 0.57 0.50 0.55 0.66 0.50 0.51 0.51 0.89 0.99 0.95 Nb* 0.16 0.26 0.16 0.12 0.13 0.21 0.13 0.26 0.16 0.12 0.11 0.17 0.19 0.15 0.19 0.29 0.39 ∑REE 227.09 135.67 243.23 270.01 227.97 149.37 277.58 81.24 223.31 150.98 158.76 239.02 290.52 223 130.19 120.61 128.99 LREE 188.44 101.58 209.31 242.88 187.72 125.31 213.03 67.4 169.7 117.91 128.65 182.59 235.43 177.32 100.5 88.18 91.46 HREE 38.65 34.09 33.92 27.13 40.25 24.06 64.55 13.84 53.61 33.07 30.11 56.43 55.09 45.68 29.69 32.43 37.53 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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