GEOCHRONOLOGY AND GEOCHEMISTRY OF THE ANDESITES FROM TAMULANGOU FORMATION IN BADAGUAN AREA, INNER MONGOLIA
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摘要:
对海拉尔北部八大关地区塔木兰沟组安山岩进行的锆石U-Pb年代学、全岩地球化学等分析工作,揭示了塔木兰沟期安山岩构造背景及岩石成因意义,并探讨了蒙古-鄂霍次克缝合带构造演化史.LA-ICP-MS锆石U-Pb定年结果显示其形成于160.9~164.0 Ma.岩石地球化学特征表明,安山岩为高钾钙碱性岩石,轻重稀土分馏明显,(La/Yb)N=9.97~26.85,Eu呈微弱负异常-弱正异常(δEu=0.71~1.11);微量元素以富集大离子亲石元素Rb、U、Th、K,强烈亏损Sr、P、Ti,相对亏损Nb、Ta为特征.岩浆可能来源于流体交代的地幔楔,并在岩浆演化过程中经历了明显的分离结晶作用.结合区域演化史,认为八大关地区塔木兰沟组安山岩形成于蒙古-鄂霍次克洋闭合后岩石圈的伸展环境.
Abstract:The paper analyzes the zircon U-Pb chronology and whole-rock geochemistry of the andesites from Tamulangou Formation in Badaguan area of northern Hailar to reveal the tectonic setting and petrogenesis of the andesites, and discusses tectonic evolution history of Mongolia-Okhotsk suture zone. The LA-ICP-MS zircon U-Pb dating results show the rocks were formed in 160.9-164.0 Ma. The lithogeochemical characteristics indicate the andesites belong to high-K calc-alkaline rock with notable fractionation of LREE and HREE, (La/Yb)N of 9.97-26.85, and slight negative-weak positive Eu anomaly (δEu=0.71-1.11); The trace elements are characterized by enrichment of LILEs (Rb, U, Th and K), severe depletion of Sr, P and Ti, and relative depletion of Nb and Ta. The magma may be derived from the fluid-metasomatized mantle wedge and experienced obvious fractional crystallization during evolution. Combined with the regional evolution history, it is believed that the andesites in the study area were formed in the lithospheric extension environment after the closure of Mongolia-Okhotsk Ocean.
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Key words:
- Tamulangou Formation /
- andesite /
- Erguna block /
- Mongolia-Okhotsk Ocean /
- Inner Mongolia
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图 6 研究区塔木兰沟组安山岩稀土元素配分及微量元素蛛网图(标准化值据文献[12])
Figure 6.
表 1 塔木兰沟组锆石LA-ICP-MS U-Pb同位素分析结果
Table 1. LA-ICP-MS U-Pb isotope analysis results of zircons from Tamulangou Formation
测点号 Th/U 同位素比值及误差 年龄及误差/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ Rz1001-1 0.45 0.05004 0.00453 0.17324 0.01526 0.02525 0.00042 195.29 137.5 162.32 12.23 160.56 3.23 Rz1001-2 0.43 0.04831 0.00162 0.17288 0.00623 0.02556 0.00035 145.25 58.23 161.54 5.45 165.32 2.01 Rz1001-3 0.42 0.04843 0.00273 0.17845 0.00625 0.02624 0.00033 168.52 58.66 16435 5.65 167.45 2.07 Rz1001-4 0.37 0.04855 0.00385 0.16467 0.00945 0.02477 0.00042 121.32 101.24 161.36 8.47 167.12 2.56 Rz1001-5 0.55 0.04701 0.00465 0.18554 0.01332 0.02751 0.00052 148.58 139.56 162.35 11.25 164.32 3.58 Rz1001-6 0.44 0.04592 0.00296 0.17810 0.00673 0.02636 0.00040 144.74 69.63 160.57 6.55 161.25 2.14 Rz1001-7 0.38 0.04641 0.00265 0.17224 0.00754 0.02751 0.00045 167.78 91.33 160.24 7.65 159.54 2.32 Rz1001-8 0.52 0.04882 0.00287 0.17797 0.00694 0.02567 0.00035 138.47 65.89 162.56 6.23 170.01 2.47 Rz1001-9 0.57 0.04735 0.00314 0.16454 0.01036 0.02457 0.00047 116.39 111.12 164.77 9.74 167.25 3.12 Rz1001-10 0.46 0.04921 0.00129 0.17146 0.00774 0.02562 0.00032 148.73 70.33 161.33 6.05 162.32 2.47 Rz1001-11 0.61 0.04985 0.00215 0.16768 0.00756 0.02555 0.00031 182.25 71.58 165.24 6.25 164.17 2.69 Rz1001-12 0.48 0.04952 0.00212 0.18246 0.00729 0.02674 0.00037 170.12 70.36 180.54 6.23 195.01 2.56 Rz1001-13 0.49 0.04974 0.00222 0.17295 0.00719 0.02535 0.00034 181.54 73.01 162.54 6.55 161.25 2.58 Rz1001-14 0.43 0.05299 0.00236 0.18812 0.00840 0.02685 0.00038 240.08 79.64 165.35 7.45 170.65 2.67 Rz1001-15 0.42 0.05039 0.00185 0.18072 0.00628 0.02670 0.00048 166.54 60.25 165.56 5.65 169.44 2.35 Rz1001-16 0.50 0.04920 0.00195 0.18122 0.00617 0.02665 0.00032 170.45 60.03 159.32 5.45 169.33 2.58 Rz1001-17 0.43 0.05046 0.00245 0.17628 0.00754 0.02542 0.00035 212.12 78.23 161.23 7.78 162.74 2.89 Rz1001-18 0.45 0.04858 0.00559 0.16678 0.00648 0.02455 0.00038 123.11 69.25 157.35 6.98 169.32 2.43 Rz1001-19 0.43 0.04924 0.00329 0.17235 0.00775 0.02542 0.00036 157.03 81.77 161.25 7.56 161.47 2.12 Rz1001-20 0.33 0.04969 0.00192 0.17598 0.00658 0.02552 0.00035 180.23 65.56 164.36 6.55 163.32 2.38 Z5-1 0.28 0.04946 0.00453 0.1835 0.01609 0.02638 0.00057 167.36 159.55 171.89 14.22 171.32 3.85 Z5-2 0.39 0.05406 0.00237 0.19387 0.00767 0.02502 0.00032 173.32 70.23 180.23 7.52 166.23 2.52 Z5-3 0.41 0.04957 0.00548 0.17834 0.01643 0.02531 0.00051 170.50 94.32 162.35 16.25 163.43 2.12 Z5-4 0.44 0.06342 0.00456 0.22459 0.0163 0.02659 0.00032 169.23 173.57 205.45 14.34 164.44 2.72 Z5-5 0.76 0.05176 0.00385 0.18357 0.02451 0.02686 0.00087 174.23 145.32 172.78 21.45 165.25 5.23 Z5-6 0.41 0.05116 0.00321 0.18155 0.01187 0.02556 0.00075 168.54 115.23 170.14 10.22 164.12 3.22 Z5-7 0.42 0.05049 0.00622 0.17828 0.02226 0.02675 0.00079 178.55 138.55 167.11 18.32 164.78 2.45 Z5-8 0.46 0.04635 0.00425 0.15631 0.01373 0.02453 0.00033 169.32 97.23 148.2 12.03 167.12 3.02 Z5-9 0.60 0.05348 0.00263 0.18732 0.00762 0.02659 0.00023 165.47 80.32 175.12 7.23 163.78 2.47 Z5-10 0.54 0.04783 0.00412 0.17321 0.0159 0.0272 0.00042 178.32 154.32 162.78 13.56 167.14 3.13 Z5-11 0.52 0.05058 0.00482 0.18589 0.01712 0.02658 0.00058 165.32 168.25 173.45 15.36 168.54 1.23 Z5-12 0.55 0.04922 0.00437 0.16070 0.01373 0.02352 0.00057 165.44 163.35 151.78 12.45 161.1 3.02 Z5-13 0.47 0.04921 0.00596 0.16340 0.01933 0.02408 0.00064 167.52 169.52 154.32 17.24 163.45 2.23 Z5-14 0.50 0.04954 0.00968 0.16566 0.03255 0.02496 0.00115 182.37 105.36 154.45 27.78 163.78 1.88 Z5-15 0.59 0.04813 0.00161 0.17008 0.00648 0.02512 0.00038 167.25 67.35 159.32 6.05 160.45 2.02 Z5-16 0.45 0.04874 0.00606 0.17582 0.02145 0.02651 0.00079 167.48 120.36 164.11 18.33 166.78 4.45 Z5-17 0.39 0.05073 0.00265 0.18672 0.00965 0.02656 0.00046 178.36 92.45 174.34 8.23 170.36 2.78 Z5-18 0.50 0.05088 0.00342 0.17209 0.01137 0.02542 0.00038 195.25 109.31 160.78 9.12 168.55 2.02 Z5-19 0.40 0.04966 0.00573 0.18572 0.02148 0.02787 0.00051 176.78 110.85 173.13 18.42 170.13 2.46 Z5-20 0.34 0.04884 0.00254 0.16479 0.00955 0.02367 0.00055 188.45 105.35 155.23 8.77 163.32 2.72 Z6-1 0.58 0.04931 0.00353 0.18363 0.01618 0.02684 0.0008 120.22 222.12 155.32 18.01 167.12 2.12 Z6-2 0.67 0.05415 0.00237 0.19384 0.00777 0.02612 0.0007 232.21 70.12 164.02 6.78 160.12 2.02 Z6-3 0.51 0.05082 0.00757 0.23467 0.03414 0.03355 0.0012 232.45 260.12 214.23 28.22 212.32 2.03 Z6-4 0.48 0.06122 0.00456 0.22809 0.0133 0.02529 0.0007 181.12 222.48 173.02 20.02 162.22 2.42 Z6-5 0.38 0.05165 0.00457 0.18458 0.02442 0.02587 0.0008 175.12 84.14 177.22 8.21 167.48 2.23 Z6-6 0.45 0.04955 0.00216 0.17359 0.00721 0.02636 0.00021 173.22 76.5 162.12 6.45 161.22 2.02 Z6-7 0.42 0.05043 0.00259 0.17187 0.00728 0.02584 0.00024 214.12 86.21 162.14 7.02 162.33 2.02 Z6-8 0.47 0.04897 0.00157 0.16196 0.00775 0.02325 0.00015 147.78 48.45 154.22 4.25 164.78 2.45 Z6-9 0.60 0.05056 0.00797 0.17164 0.02355 0.02661 0.00029 220.12 240.45 167.56 21.12 163.45 1.78 Z6-10 0.33 0.04985 0.00168 0.17181 0.00232 0.02322 0.00019 193.44 63.56 163.56 5.56 161.45 2.03 Z6-11 0.40 0.04761 0.00182 0.16803 0.00582 0.02361 0.00018 129.47 62.44 155.66 5.05 163.78 2.69 Z6-12 0.35 0.04879 0.00193 0.17194 0.00015 0.02476 0.00029 185.46 104.78 165.04 9.32 164.65 2.44 Z6-13 0.39 0.04917 0.00167 0.17238 0.00827 0.02891 0.00017 151.25 94.78 164.69 8.45 165.56 2.23 Z6-14 0.68 0.04859 0.00182 0.17915 0.02114 0.02666 0.00019 176.47 261.56 176.25 25.58 166.36 6.03 Z6-15 0.06 0.05526 0.00186 0.17556 0.00535 0.02435 0.00018 127.22 56.11 173.45 5.58 165.33 2.03 Z6-16 0.49 0.05222 0.00167 0.17855 0.00524 0.02376 0.00028 191.23 47.22 166.44 4.22 167.36 2.02 Z6-17 0.57 0.04975 0.00187 0.17262 0.02322 0.02588 0.00029 183.45 140.23 160.45 20.03 168.77 5.36 Z6-18 0.56 0.07856 0.00125 1.14425 0.03228 0.12758 0.00121 948.22 59.56 821.4 1523 775.36 7.22 Z6-19 0.39 0.04889 0.00156 0.18312 0.00668 0.02457 0.00021 195.25 63.89 171.56 6.36 169.33 2.05 Z6-20 0.46 0.04815 0.00178 0.17432 0.00503 0.02527 0.00037 106.56 60.32 163.03 5.45 167.23 2.07 表 2 塔木兰沟组安山岩主量元素、微量元素和稀土元素分析结果
Table 2. Contents of major, trace and rare earth elements in andesites from Tamulangou Formation
样品号 YQ10729 YQ2969 YQ5194 YQ5223 YQ4143 YQ6256 YQ5157 YQ4818-2 YQ12509 SiO2 55.67 55.59 57.18 53.60 55.91 57.15 56.49 56.30 50.02 TiO2 1.09 1.32 1.09 1.13 0.90 1.01 1.26 2.19 2.13 Al2O3 22.02 17.16 17.73 19.44 19.87 17.86 16.89 15.83 17.57 TFe2O3 5.20 6.82 6.17 7.79 5.64 6.72 6.60 7.17 8.96 Fe2O3 2.47 6.40 4.23 4.22 3.74 2.55 4.02 7.19 9.48 FeO 2.99 1.07 2.37 4.00 2.28 4.43 2.99 0.72 0.44 MnO 0.08 0.09 0.10 0.20 0.11 0.17 0.09 0.08 0.05 MgO 2.39 2.42 2.81 3.48 3.76 3.07 3.46 2.23 1.23 CaO 4.66 6.10 5.82 4.28 2.25 5.09 6.02 5.48 4.73 Na2O 3.55 4.35 3.89 3.52 7.14 4.18 3.96 3.97 4.08 K2O 0.97 2.97 1.81 1.66 0.67 0.48 2.27 2.93 3.16 P2O5 0.29 0.48 0.30 0.25 0.27 0.29 0.47 1.13 1.14 LOI 3.58 1.72 2.42 3.96 2.89 3.51 1.73 1.50 5.54 Total 99.75 99.67 99.76 99.73 99.79 99.79 99.65 99.55 99.57 La 16.90 41.16 17.87 19.24 22.34 22.59 39.58 82.53 80.94 Ce 37.01 81.42 37.65 40.79 44.74 45.85 79.68 182.30 167.30 Pr 5.24 10.59 5.26 5.71 6.10 6.21 10.46 25.48 22.95 Nd 21.20 40.91 21.56 23.31 24.25 24.82 41.13 97.32 87.58 Sm 4.14 6.70 4.36 4.31 4.07 4.29 6.73 15.21 13.55 Eu 1.26 1.88 1.26 1.45 1.32 1.41 1.93 3.29 3.36 Gd 3.21 5.32 3.39 3.44 3.21 3.46 5.08 12.62 11.52 Tb 0.51 0.75 0.56 0.53 0.50 0.47 0.66 1.60 1.37 Dy 2.54 3.41 2.82 2.70 2.45 2.07 2.90 6.70 5.68 Ho 0.44 0.61 0.50 0.43 0.43 0.32 0.48 1.11 0.93 Er 1.11 1.59 1.31 1.08 1.06 0.78 1.28 2.84 2.35 Tm 0.17 0.24 0.20 0.14 0.15 0.10 0.18 0.41 0.33 Yb 0.99 1.38 1.21 0.74 0.88 0.57 1.01 2.52 2.10 Lu 0.27 0.49 0.22 0.14 0.24 0.16 0.37 0.68 0.71 Y 11.21 16.16 13.46 11.69 11.80 8.62 12.72 25.77 22.15 Pb 7.19 13.76 10.82 10.53 7.74 15.29 16.22 17.67 20.50 Rb 15.02 68.90 40.27 46.56 9.33 8.20 35.81 38.80 34.14 Ba 536.35 958.27 768.38 596.74 454.66 316.32 1111.68 1212.00 1219.20 Th 2.89 5.82 3.43 2.45 2.96 1.91 5.06 5.12 4.98 U 0.34 0.85 0.85 0.55 0.24 0.38 1.00 1.62 2.30 Nb 6.01 10.18 5.65 1.26 4.90 4.76 8.71 22.19 16.28 Ta 0.41 0.56 0.36 0.12 0.30 0.27 0.44 1.16 0.86 Sr 864.25 972.44 727.35 788.53 872.71 1179.44 1132.52 804.65 547.58 Zr 164.38 260.13 132.00 142.27 152.23 131.20 228.87 601.65 399.74 Hf 4.84 5.71 3.71 3.90 4.65 3.48 5.34 11.90 8.64 LR/HR 9.26 13.24 8.61 10.30 11.52 13.26 15.02 14.26 15.04 δEu 1.02 0.93 0.97 1.11 1.08 1.08 0.97 0.71 0.80 含量单位: 主量元素为%, 微量、稀土元素为10-6. -
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