Geochronological and geochemical characteristics of rhyolite in the Manketou'ebo Formation of Dong Ujimqin Banner, Inner Mongolia, and its geological implications
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摘要:
为确定内蒙古东乌旗地区满克头鄂博组火山岩地层的时代归属和形成构造背景，对满克头鄂博组流纹岩进行了年代学、地球化学特征等研究。流纹岩的LA-ICP-MS锆石U-Pb年龄为150.9±4.2Ma，时代归属晚侏罗世。满克头鄂博组流纹岩属于高钾钙碱性系列岩石，且具有高硅、富碱、高铝、贫钙贫镁的特征。稀土元素总量变化较大，配分曲线右倾，具有负Eu异常；富集大离子亲石元素（LILE）Rb、K、Th和轻稀土元素，亏损Sr和Nb、Ti、P；基性相容元素Cr、Co、Ni和Mg#值较低，岩浆来源于下地壳岩石的部分熔融。根据元素地球化学特征，流纹岩具有A型花岗岩特征，结合相关构造判别图解，表明东乌旗地区在晚侏罗世处于伸展构造环境，可能与蒙古-鄂霍茨克洋闭合造山后伸展作用体制有关。
Abstract:In order to determine the age attribution and tectonic setting of the volcanic strata of the Manketou'ebo Formation in Dong Ujimqin Banner of Inner Mongolia, the authors studied the geochronological and geochemical characteristics of the rhyolite from the Manketou'ebo Formation. The weighted age of rhyolite by LA-ICP-MS zircon U-Pb dating is 150.9±4.2Ma, suggesting Late Jurassic. The rhyolite in the Manketou'ebo Formation belongs to the high-potassic calc-alkaline series of rocks and is characterized by high silicon, rich alkali, high aluminum, low calcium and depleted magnesium. The total amount of rare earth elements changes greatly, the distribution curve is right-inclined, and there is negative anomaly of Eu. The rocks are enriched in large ion lithophile elements of Rb, K, Th, and LREE, and simultaneously depleted in elements of Sr, Nb, Ti and P. The basic compatible elements Cr, Co, Ni and Mg# are relatively low, and the magma was derived from the partial melting of the lower crust rocks. According to element geochemical characteristics, rhyolite has A-type granite characteristics. Combined with the related structural discriminant diagrams, the authors hold that the Dong Ujimqin Banner area was in an extensional tectonic setting in the Late Jurassic, and may be related to the extensional system of the Mongolian-Okhotsk Ocean after the closure of the ocean.
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表 1 满克头鄂博组流纹岩（TW3616-1）LA-ICP-MS锆石U-Th-Pb测年结果
Table 1. LA-ICP-MS zircon U-Th-Pb analyses of rhyolite(TW3616-1)in the Manketou'ebo Formation
点号 206Pbc/% 含量/10-6 232Th/238U 207Pb*/206Pb 207Pb*/235U 206Pb*/238U 206Pb/238U
年龄/Ma207Pb/206Pb
年龄/MaU Th 206Pb* 比值 ±% 比值 ±% 比值 ±% 1.1 8.01 77 54 1.75 0.73 0.078 24 0.262 24 0.02454 2.9 156.3±4.4 1, 136±480 2.1 2.96 291 110 11.6 0.39 0.054 19 0.336 19 0.04518 2.1 284.9±6.0 369±420 3.1 6.05 53 33 2.46 0.63 0.073 27 0.50 27 0.0503 2.9 316.4±9.0 1, 006±540 4.1 0.89 2658 1606 53.9 0.62 0.0473 3.6 0.153 3.6 0.02339 0.46 149.01±0.7 64± 86 5.1 2.30 526 261 10.6 0.51 0.0489 11 0.155 11 0.02294 1.1 146.2±1.5 143±270 6.1 1.22 1697 688 34.5 0.42 0.0467 5.8 0.151 5.8 0.02339 0.73 149.0±1.1 34±140 7.1 1.20 490 342 22.8 0.72 0.0546 9.6 0.403 9.7 0.05353 0.83 336.2±2.7 397±220 8.1 0.57 2349 1010 51.0 0.44 0.0498 2.6 0.173 3.1 0.02512 1.6 159.9±2.5 187± 61 9.1 1.23 771 358 35.6 0.48 0.0515 4.8 0.378 4.8 0.05316 0.72 333.9±2.3 264±110 10.1 1.86 1122 409 24.0 0.38 0.0491 11 0.165 11 0.02442 1.1 155.5±1.7 153±260 11.1 9.95 90 51 2.03 0.59 0.129 19 0.420 19 0.02370 3.4 151.0±5.1 2, 078±340 12.1 0.20 1538 589 32.6 0.40 0.0583 2.6 0.198 2.6 0.02461 0.57 156.75±0.9 542± 56 13.1 3.15 212 97 3.91 0.47 0.0596 15 0.171 15 0.02077 1.9 132.5±2.4 589±320 注：206Pbc和206Pb*分别表示普通Pb和放射性成因Pb；普通Pb根据实测204Pb进行矫正，误差为1σ 
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表 2 满克头鄂博组流纹岩主量、微量和稀土元素组成及化学参数
Table 2. Major elements, trace elements and REE composition and chemical parameters of rhyolites in the Manketou'ebo Formation
样号 GS780# GS781# GS782# GS3616 GS3183 PM6XT9 SiO2 75.4 75.92 73.36 76.71 75.34 75.51 TiO2 0.23 0.25 0.3 0.11 0.04 0.17 Al2O3 11.82 12.12 13.44 12.18 12.74 12.01 Fe2O3 0.98 0.68 2.01 0.63 0.88 1.64 FeO 0.31 0.12 0.19 0.65 0.23 0.22 MnO 0.016 0.012 0.022 0.04 0.04 0.02 MgO 0.34 0.46 0.17 0.21 0.27 0.2 CaO 0.32 0.32 0.48 0.36 0.46 0.82 Na2O 3.88 3.52 3.79 3.66 3.6 3.16 K2O 5.2 4.83 4.75 5.04 5.47 4.81 P2O5 0.05 0.03 0.07 0.03 0.04 0.04 烧失量 1.12 1.12 0.88 1.28 1.04 0.57 总计 99.67 99.38 99.46 100.9 100.15 99.17 K2O/Na2O 1.34 1.37 1.25 1.38 1.52 1.52 TFeO/MgO 3.51 1.59 11.76 5.79 3.78 8.48 A/CNK 0.94 1.04 1.1 0.99 1 1.01 Mg# 0.34 0.53 0.13 0.24 0.32 0.17 σ 2.53 2.11 2.39 2.09 2.21 1.95 DI 96.26 95.69 93.49 96 95.71 93.15 La 42.9 37.5 36.5 24.9 19.7 60.3 Ce 88.5 79.1 66.2 40 38 131.4 Pr 11.3 9.05 7.73 5.86 5.02 17.1 Nd 44.2 33.7 27.1 19 18.4 60.4 Sm 9.23 6.57 4.78 3.08 3.63 11.3 Eu 0.54 0.56 1.15 0.49 0.5 0.28 Gd 7.61 5.45 4.28 2.63 3.2 9.4 Tb 1.2 0.84 0.71 0.41 0.5 1.58 Dy 6.52 4.76 4.13 2.34 2.7 8.4 Ho 1.24 0.94 0.85 0.45 0.49 1.51 Er 3.8 2.69 2.63 1.33 1.45 4.45 Tm 0.62 0.48 0.48 0.23 0.23 0.69 Yb 3.93 3.08 3.17 1.5 1.46 4.4 Lu 0.67 0.53 0.56 0.24 0.23 0.6 Y 34.5 26.1 24.6 14.4 14.3 43.4 Cr 6.13 5.94 4.35 2.4 7 7.4 Ba 85 87 916 512 542.9 147 Nb 18.4 19 15.5 8.5 11 21.4 Rb 199 192 127 112 131.7 230.1 Sr 29 28 120 86 100.3 30.7 Co 5.2 4.4 5.3 0.8 4.3 6 Th 15.88 16.14 13.04 7.9 12.8 26.7 Zr 177 194 232 89 83.1 255 Ni 5.6 4.6 3.9 2 7.1 3.4 Ti 1380 1500 1800 660 240 1020 ∑REE 222.26 185.25 160.27 102.46 95.51 311.81 LREE 196.67 166.48 143.46 93.33 85.25 280.78 HREE 25.59 18.77 16.81 9.13 10.26 31.03 LR/HR 7.69 8.87 8.53 10.22 8.31 9.05 δEu 0.19 0.28 0.76 0.51 0.44 0.08 (La/Sm)N 2.26 2.92 3.59 4.8 5.09 3.41 (La/Yb)N 7.36 8.21 7.76 11.19 9.1 9.24 (Ce/Yb)N 4.29 5.82 6.64 5.4 6.9 6.73 注：主量元素测试单位为天津地质矿产研究所, 微量和稀土元素测试单位为中国地质科学院地球物理地球化学勘查研究所。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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