Geochemical characteristics and zircon U-Pb ages of porphyroclastic lava in the Bayaerhushuo area, the south-central segment of Great Xing'an Range, and its geological significance
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摘要:
在大兴安岭中南段巴雅尔吐胡硕地区发现一套碎斑熔岩。根据野外调查，可分为中心相的细微粒斑状石英二长岩（-石英二长斑岩）和边缘相的英安流纹质碎斑熔岩。通过SHRIMP锆石U-Pb测年，获得细微粒斑状石英二长岩的年龄加权平均值为137.4±0.9Ma（MSWD=1.13），英安流纹质碎斑熔岩的年龄加权平均值为135.2±0.8Ma（MSWD=1.17），二者的形成时代均属于早白垩世早期。由元素地球化学分析可知，6件样品均属于过铝质的高钾钙碱性A型花岗岩，且具有完全一致的微量元素蛛网图和稀土元素配分曲线，均具有明显的负Eu异常，均富集大离子亲石元素Rb、Pb和轻稀土元素，亏损高场强元素Nb，Th较富集，Ba、Sr、Eu具有一定亏损，Pb强烈富集，表明岩石来源于地壳部分熔融。在构造环境判别分析的基础上，提出研究区碎斑熔岩属于碰撞后或造山期后的张性构造环境花岗岩（A2型花岗岩），形成于拉张环境，代表了伸展的大地构造背景。结合大兴安岭地区的大地构造演化特征，其形成与蒙古-鄂霍茨克闭合造山后的岩石圈伸展作用有关。
Abstract:The porphyroclastic lava is located in the Bayaerhushuo area, the south-central segment of Great Xing'an Range, which can be divided into two parts, the central facies of fine-grained quartz monzonites (-quartz monzonitic porphyry) and the margin facies of dacitic rhyolitic porphyroclastic lava. Based on the SHRIMP zircon U-Pb dating, the porphyry monzonitic granite and dacitic ryholititic porphyroclastic lava samples yielded U-Pb ages of 137.4±0.9Ma (MSWD=1.13) and 135.2±0.8Ma (MSWD=1.17) respectively, indicating that the porphyroclastic lava samples in the study area were formed during the Early Cretaceous. The results of geochemical analyses show that the six samples are all high-K calc-alkaline A-typed granites and have the same characteristics in the trace element spidergrams and REE patterns. The features of evident negative Eu anomaly, enrichment in the LILEs Rb and Pb, LREE and Th, depletion in HFSE Nb, Ba, Sr and Eu, reveal that these samples may originate from the partial melting of crust. By tectonic environment discriminations, the porphyroclastic lava are plotted into the A2-typed granite, revealling the post-collisional extension environment. Combined with the Mesozoic tectonic evolution of the Great Xing'an Range, the formation of the Early Cretaceous porphyroclastic lava should be related to the lithospheric extensional envrinment caused by the closure of MongoliaOkhotsk ocean.
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表 1 碎斑熔岩SHRIMP锆石U-Th-Pb测年数据分析结果
Table 1. SHRIMIP zircon U-Th-Pb data for the porphyroclastic lava
点号 元素含量 232Th/238U 同位素比值 年龄/Ma 206Pbc/% U/10-6 Th/10-6 206Pb*/10-6 207Pb*/206Pb* 1σ 207Pb*/235U 1σ 206Pb*/238U 1σ 206Pb/238U 1σ 细微粒斑状石英二长岩PM26-31 1 0.47 493 134 9.09 0.28 0.0487 6.7 0.1433 6.8 0.0214 1.4 136.3 1.8 2 0 467 149 8.61 0.33 0.0498 3.3 0.1477 3.6 0.0215 1.3 137.1 1.8 3 0.42 746 303 13.6 0.42 0.0469 5.2 0.1369 5.4 0.0212 1.3 135 1.7 4 0.36 711 274 13.2 0.4 0.0471 4.3 0.1395 4.4 0.0215 1.2 136.9 1.7 5 0.3 326 118 6.06 0.37 0.0504 6.7 0.15 6.8 0.0216 1.4 137.6 2.0 6 0.49 612 184 11.3 0.31 0.0475 4 0.1402 4.2 0.0214 1.3 136.5 1.7 7 0.1 710 226 13.3 0.33 0.0487 4 0.1456 4.2 0.0217 1.2 138.4 1.7 8 0.36 457 186 8.44 0.42 0.046 4.4 0.1357 4.6 0.0214 1.3 136.6 1.8 9 0.09 1204 390 23 0.33 0.04881 2 0.1492 2.4 0.0221 1.2 141.4 1.6 10 10.42 518 160 10.7 0.32 0.053 22 0.157 22 0.0214 1.9 136.7 2.6 11 0.73 608 305 11 0.52 0.0455 7.3 0.1313 7.4 0.0209 1.3 133.5 1.7 12 0.23 626 354 11.8 0.58 0.0496 4 0.1497 4.2 0.0219 1.2 139.6 1.7 13 -- 835 325 15.6 0.4 0.0487 2.3 0.1459 2.6 0.0217 1.2 138.6 1.6 14 0 636 170 11.8 0.28 0.0472 2.8 0.1406 3.1 0.0216 1.3 137.9 1.7 15 0 530 194 9.81 0.38 0.0493 3 0.1466 3.3 0.0216 1.3 137.5 1.7 16 0.26 512 201 9.5 0.41 0.0504 4.5 0.1497 4.7 0.0215 1.3 137.4 1.8 英安流纹质碎斑熔岩PM26-40 1 0.15 935 260 17.1 0.29 0.0478 3.1 0.1398 3.3 0.0212 1.2 135.3 1.6 2 10.15 405 134 8 0.34 0.042 31 0.12 31 0.0207 2.1 131.8 2.7 3 0 672 295 12.3 0.45 0.0471 2.6 0.1384 2.9 0.0213 1.2 135.9 1.6 4 0 399 144 7.2 0.37 0.0505 3.3 0.1463 3.6 0.0210 1.3 134.1 1.7 5 0 478 179 8.89 0.39 0.0499 3 0.149 3.3 0.0217 1.3 138.1 1.7 6 0.11 381 149 6.98 0.4 0.0515 5.7 0.1513 5.8 0.0213 1.4 135.8 1.9 7 0.23 1108 342 20.8 0.32 0.0477 2.6 0.1431 2.8 0.0218 1.2 138.8 1.6 8 0.06 990 454 18.1 0.47 0.0486 4.3 0.1425 4.5 0.0213 1.2 135.6 1.6 9 0.06 1061 359 19.2 0.35 0.0484 4 0.1406 4.2 0.0211 1.2 134.6 1.6 10 0.58 577 189 10.4 0.34 0.048 3.8 0.1376 4 0.0208 1.3 132.7 1.7 11 -- 730 279 13.3 0.4 0.0492 2.5 0.1436 2.8 0.0212 1.2 135.1 1.6 12 0.28 504 109 9.02 0.22 0.0487 3.7 0.1395 3.9 0.0208 1.3 132.6 1.7 13 1.41 853 425 15.6 0.52 0.0451 9.8 0.13 9.9 0.021 1.3 133.7 1.7 14 0.13 360 113 6.53 0.32 0.0478 6.4 0.1388 6.5 0.0211 1.4 134.4 1.9 15 0.15 1631 552 30 0.35 0.04782 1.9 0.1411 2.2 0.0214 1.1 136.6 1.5 16 0.08 732 392 13.5 0.55 0.0494 4.8 0.1465 4.9 0.0215 1.3 137.3 1.7 17 0.13 1107 405 20 0.38 0.0485 2.3 0.1407 2.6 0.0210 1.2 134.1 1.6 注：Pbc和Pb*分别代表普通铅和放射性成因铅 
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表 2 碎斑熔岩主量、微量和稀土元素分析结果
Table 2. Major, trace and REEs data for volcanic rocks of the porphyroclastic lava in the Bayaerhushuo area, the south-central segment of Great Xing' an Range
元素 细微粒斑状石英二长岩（-石英二长斑岩） 英安流纹质碎斑熔岩 PM26-31 PM26-26 PM26-23 PM26-57 PM26-40 PM26-17 SiO2 68.26 68.91 69.04 71.07 71.02 71.38 TiO2 0.42 0.61 0.48 0.59 0.34 0.43 Al2O3 15.17 15.13 15.27 14.86 14.93 14.76 Fe2O3 1.79 2.4 0.78 1.08 0.92 1.43 FeO 3.26 2.32 3.48 2.36 2 1.76 MnO 0.1 0.04 0.03 0.05 0.05 0.05 MgO 0.74 0.65 1.07 0.48 0.77 0.48 CaO 1.58 1.79 1.72 1.55 2.08 1.82 Na2O 3.52 3.94 4.05 4 4.02 3.92 K2O 5.04 4.21 3.96 3.94 3.81 3.94 P2O5 0.11 0.01 0.12 0.02 0.07 0.02 Li 22.21 26.25 21.53 22.77 16.23 15.26 Be 2.98 3.43 3.51 3.78 4.04 3.85 Sc 4.88 4.89 4.9 3.44 3.44 3.41 Ti 2573.69 2562.46 2564.4 1625.08 1808.61 1675.53 V 19.55 18.24 18.98 12.96 13.33 12.71 Cr 2.66 6.08 2.71 3.78 2.83 3.11 Mn 636.53 206.99 249.42 220.3 265.92 274.95 Co 2.55 2.74 2.97 2.88 3 2.45 Ni 2.31 5.02 6.12 5.68 3.43 3.73 Cu 199.63 41.48 8.36 13.56 8.34 6.97 Zn 110.4 70.29 98.29 49.84 86.93 80.25 Ga 22.16 21.14 20.85 20.84 20.86 20.77 Ge 1.68 1.51 1.55 1.51 1.5 1.56 As 12.57 26.24 7.32 14.81 16.76 6.69 Rb 196.1 188.85 175.62 180.36 187.58 178.01 Sr 200.21 275.98 293.04 226.24 220.23 246.85 Y 18.55 24.64 24.46 22.11 24.85 22.98 Zr 107.84 111.6 112.57 103.66 111.91 108.37 Nb 8.8 8.71 8.75 7.78 8.03 8.08 Mo 1.43 1.43 0.57 1.31 0.34 0.56 Cd 0.16 0.58 0.58 0.2 0.65 0.09 In 0.59 0.13 0.15 0.05 0.05 0.06 Sn 14.31 15.14 17.35 8.83 7.77 7.75 Sb 0.72 0.52 0.44 0.64 1.06 0.53 Cs 3.95 5.22 3.67 3.89 4.13 3.53 Ba 794.05 659.02 615.76 500.36 477.23 532.78 La 22.01 26.33 30.78 22.33 28.66 29.35 Ce 55.23 55.28 55.6 54.87 54.75 57.48 Pr 5.01 6.08 6.46 5.37 6.29 6.23 Nd 17.18 21.72 23.75 18.9 22.29 22.13 P 480.11 43.65 523.75 87.29 305.52 87.29 Sm 3.46 4.46 4.43 3.77 4.13 4.26 Eu 0.66 0.95 0.91 0.69 0.65 0.78 Gd 4.19 5 5.3 4.46 4.57 4.98 Tb 0.62 0.75 0.75 0.65 0.7 0.7 Dy 3.41 4.1 4.13 3.58 4.02 3.73 Ho 0.64 0.81 0.79 0.71 0.78 0.74 Er 2.15 2.62 2.53 2.4 2.55 2.43 Tm 0.31 0.38 0.37 0.37 0.38 0.36 Yb 2.22 2.73 2.66 2.66 2.7 2.61 Lu 0.35 0.4 0.42 0.39 0.43 0.39 Hf 3.46 3.48 3.56 3.46 3.75 3.76 Ta 0.9 0.93 0.89 0.98 0.94 1.05 K 41838.55 34948.47 32873.15 32707.12 31627.95 32707.12 W 3.62 0.91 0.93 1.31 1.34 0.82 Tl 1.68 1.37 1.35 0.98 1.00 0.83 Pb 29.53 28.25 49.92 18.50 28.12 26.01 Bi 0.17 0.58 0.26 0.57 0.84 0.30 Th 18.67 20.28 18.87 24.88 23.08 25.70 U 3.85 2.87 3.04 5.12 3.07 4.59 A/CNK 1.07 1.06 1.09 1.09 1.03 1.05 A/NK 1.35 1.37 1.39 1.37 1.39 1.38 ∑REE 140.87 161.14 168.24 146.70 161.19 162.56 ∑LREE 126.98 144.35 151.29 131.48 145.06 146.62 ∑HREE 13.89 16.79 16.95 15.22 16.13 15.94 ∑LREE/∑HREE 9.14 8.60 8.93 8.64 8.99 9.20 δEu 0.53 0.61 0.57 0.51 0.46 0.52 (La/Yb）N 6.68 6.50 7.80 5.66 7.16 7.58 (Ce/Yb）N 6.44 5.24 5.41 5.34 5.25 5.70 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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