Characteristics and geological impli-cations of the Late Permian adakitic volcanic rocks from Bairin Right Banner area, Inner Mongolia
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摘要:
内蒙古东南部巴林右旗地区发育晚二叠世埃达克质火山岩，岩石组合为安山岩、粗安岩、英安岩及辉石安山岩，其LAICP-MS锆石U-Pb测年结果为256.7±2.7Ma，指示其形成于晚二叠世。地球化学特征显示，该套火山岩属准铝质-弱铝质中钾钙碱性岩石系列，具富Si（SiO2>56%）、高Al（Al2O3>15%）、富Na、贫K、高Sr、低Yb和Y等特征，Na2O/K2O值为2.33~3.90，Mg#值为35.3~60.8；稀土元素总量为96.69×10-6~192.4×10-6、轻重稀土元素分馏较明显（（La/Yb）N值为6.27~13.82），具正的Eu（δEu=1~1.67）异常，在原始地幔标准化蛛网图中，富集大离子亲石元素Rb、Ba、U，亏损高场强元素Nb、Ta，为O型（大洋型）埃达克质火山岩地球化学特征。综合区域资料，巴林右旗埃达克质火山岩是残留在地幔中的古亚洲洋残余洋壳部分熔融并受到地幔橄榄岩混染形成的，暗示晚二叠世存在古亚洲洋向华北板块俯冲消亡事件。
Abstract:Permian adakitic volcanic rocks are distributed in Bairin Right Banner, southeast Inner Mongolia. This set of adakitic volcanic rocks is mainly outcropped in Dayushu, Shanhoutun and Handaba, with rock association being andesite, trachyandesite, dacite and augite andesite. The LA-ICP-MS zircon U-Pb age is 256.7±2.7Ma, indicating that the rocks were formed in the Late Permian. This set of volcanic rocks belongs to the quasi-aluminum-weak aluminium and medium-K-Calcalkaline rock series, with the following geochemical characteristics:rich Si (SiO2>56%), high Al (Al2O3>15%), rich Na, poor K (Na2O=4.32%~4.73%, K2O=4.32%~2.49%), higher Sr and lower Yb and Y (Sr > 400×10-6, Yb < 1.9×10-6, Y < 18×10-6), Na2O/K2O=2.33~3.90, Mg#=35.3~60.8, the to-tal amount of rare earth elements 96.69×10-6~192.4×10-6, light and heavy REE exhibiting obvious fractionation ((La/Yb)N=6.27~13.82) and positive anomalies δEu (1~1.67). Enrichment of LILE (Rb, Ba, U) and depletion of HFSE(Nb, Ta) are displayed in the primitive mantle normalized multielement variation diagram, indicating geochemical characteristics of O-type adakitic volcanic rocks. Based on regional information, adakitic volcanic rocks distributed in Bairin Right Banner were formed by contamination of the partly molten remnants of Paleo-Asian oceanic crust and the mantle peridotite, suggesting the existence of subduction extinction event of Paleo-Asian oceanic crust toward the North China Plate in Late Permian.
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Key words:
- zircon U-Pb age /
- Late Permian /
- adakite /
- remnants of oceanic crust /
- Paleo-Asian Ocean
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表 1 巴林右旗地区安山岩LA-ICP-MS锆石U-Th-Pb同位素数据
Table 1. LA-ICP-MS U-Th-Pb composition of zircon samples from the andesite in Bairin Right Banner area
测点号 Pb U 232Th/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U /10-6 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ D0008-1 16 341 0.95 0.05217 0.00131 0.2867 0.0070 0.03990 0.00034 300.1 57.4 255.9 5.5 252.2 2.1 D0008-2 6 119 0.65 0.05329 0.00237 0.2890 0.0122 0.04012 0.00056 342.7 101.8 257.8 9.6 253.6 3.5 D0008-3 5 96 0.77 0.05319 0.00254 0.2873 0.0135 0.03948 0.00047 344.5 104.6 256.4 10.6 249.6 2.9 D0008-4 6 128 0.86 0.05669 0.00224 0.3066 0.0114 0.03971 0.00041 479.7 87.0 271.5 8.9 251.0 2.5 D0008-561130.840.068570.002590.37720.01410.040160.00046887.077.8325.010.4253.82.8D0008-6 7 144 1.17 0.05643 0.00199 0.3130 0.0100 0.04094 0.00040 477.8 77.8 276.5 7.8 258.7 2.5 D0008-761200.820.059690.002020.32830.01060.040290.00042590.874.1288.38.1254.62.6D0008-8 7 142 0.77 0.05358 0.00207 0.2986 0.0110 0.04075 0.00042 353.8 87.0 265.3 8.6 257.5 2.6 D0008-9 6 110 1.05 0.05368 0.00208 0.2988 0.0108 0.04090 0.00044 366.7 54.6 265.4 8.4 258.4 2.7 D0008-10 7 135 0.63 0.05768 0.00197 0.3245 0.0101 0.04141 0.00046 516.7 75.9 285.3 7.8 261.6 2.8 D0008-1171490.710.059110.001900.32310.00980.040170.00036572.370.4284.37.5253.92.2D0008-12 6 131 0.72 0.05219 0.00196 0.2939 0.0108 0.04108 0.00044 294.5 85.2 261.6 8.5 259.5 2.7 D0008-13 6 116 0.74 0.05694 0.00202 0.3160 0.0107 0.04097 0.00042 500.0 77.8 278.8 8.3 258.9 2.6 D0008-145920.610.072300.002680.41060.01440.041660.00047994.4108.3349.310.4263.12.9D0008-1551150.550.061730.002170.33700.01090.040480.00044664.875.9294.98.3255.82.7D0008-16 9 194 0.72 0.05294 0.00156 0.2880 0.0084 0.03958 0.00036 327.8 66.7 257.0 6.6 250.2 2.2 D0008-17 8 166 0.74 0.05271 0.00170 0.3043 0.0094 0.04230 0.00038 316.7 72.2 269.7 7.3 267.1 2.3 D0008-18 5 104 0.61 0.05458 0.00210 0.2939 0.0104 0.04019 0.00044 394.5 87.0 261.6 8.1 254.0 2.7 D0008-19 11 227 0.79 0.05618 0.00137 0.3163 0.0072 0.04122 0.00031 461.2 58.3 279.1 5.6 260.4 2.0 D0008-20 10 207 0.79 0.05225 0.00152 0.2900 0.0080 0.04061 0.00031 298.2 66.7 258.6 6.3 256.6 1.9 注：带删除线测点为不谐和点 
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表 2 巴林右旗地区火山岩主量、微量和稀土元素分析结果
Table 2. Major element, trace element and REE compositions of volcanic rock in Bairin Right Banner area
样品号 Pm003 GS6 Pm003GS 12 Pm002 GS18 Pm002 GS76 Pm002 GS83 SS09 1804 GS0008 W33YQ-1 W34YQ-1 W35YQ-1 JG21- 29-058 JG21- 29-059 编号 1 2 3 4 5 6 7 东梁侵入岩 建设屯侵入岩 岩体 巴林右旗火山岩 SiO2 64.30 58.76 60.74 59.08 60.04 54.76 66.08 71.80 68.80 70.30 70.01 69.91 TiO2 0.75 0.98 0.87 0.95 0.43 1.09 0.49 0.29 0.39 0.33 0.37 0.36 Al2O3 15.25 17.48 16.52 17.85 17.55 17.42 16.07 14.95 15.85 15.55 15.59 15.74 Fe2O3 1.42 3.07 1.78 3.41 3.04 1.58 1.15 2.00 2.72 2.03 1.02 1.02 FeO 2.61 3.19 3.00 2.41 2.73 5.74 2.18 1.18 1.18 MnO 0.09 0.13 0.08 0.09 0.10 0.14 0.08 0.04 0.04 0.04 0.03 0.03 MgO 2.26 1.82 4.01 2.91 3.03 4.04 1.64 0.62 1.28 0.96 1.07 1.03 CaO 4.73 10.63 3.64 5.34 5.89 4.92 3.88 2.11 3.13 1.75 3.24 3.24 Na2O 4.32 1.33 4.62 4.73 4.41 4.60 4.59 4.50 4.82 4.52 4.34 4.41 K2O 1.83 0.56 2.05 1.63 1.13 2.49 1.97 2.78 2.33 3.11 2.07 2.03 P2O5 2.36 2.38 2.25 2.90 3.90 1.85 2.33 0.09 0.12 0.11 0.12 0.12 烧失量 1.66 1.14 2.06 1.64 1.54 2.88 1.24 0.98 0.44 1.09 0.61 0.57 总量 99.46 99.39 99.68 100.3 99.93 99.99 99.51 100.23 99.97 99.85 99.65 99.64 Mg# 50.9 35.3 60.8 48.6 49.7 50.1 47.6 38.04 48.24 48.36 47.61 46.67 La 19.50 24.30 21.80 14.40 14.70 14.04 16.40 15.00 18.30 15.60 16.5 15.01 Ce 43.00 53.90 49.90 32.20 33.40 47.33 33.70 23.50 36.30 29.50 34.24 30.29 Pr 4.9 6.38 5.98 4.0 4.08 4.75 3.77 2.45 3.90 3.10 3.98 3.51 Nd 18.50 25.00 23.30 16.20 16.60 19.84 14.20 8.50 13.90 11.00 14.66 13.13 Sm 3.38 4.80 4.20 3.45 3.56 4.02 2.61 1.55 2.65 2.03 2.65 2.32 Eu 1.11 1.94 1.44 1.72 1.71 1.52 0.87 0.48 0.66 0.54 0.79 0.7 Gd 3.37 5.00 4.21 3.73 3.76 4.29 2.63 1.09 1.79 1.39 2.26 1.96 Tb 0.44 0.69 0.53 0.56 0.55 0.54 0.33 0.16 0.26 0.22 0.29 0.25 Dy 2.15 3.64 2.67 3.10 3.05 2.89 1.66 0.91 1.31 1.00 1.41 1.25 Ho 0.39 0.67 0.50 0.61 0.60 0.55 0.30 0.16 0.27 0.20 0.27 0.25 Er 1.05 1.62 1.36 1.29 1.28 1.60 0.96 0.37 0.71 0.56 0.69 0.63 Tm 0.15 0.25 0.19 0.23 0.23 0.23 0.10 0.09 0.19 0.13 0.1 0.09 Yb 0.95 1.67 1.38 1.53 1.58 1.47 0.72 0.48 0.70 0.53 0.64 0.60 Lu 0.14 0.23 0.19 0.21 0.21 0.21 0.09 0.08 0.13 0.08 0.1 0.09 Y 9.06 15.40 11.50 13.50 13.60 13.95 6.72 4.80 7.10 5.40 8.90 7.80 ∑REE 108.05 145.49 129.15 192.4 96.69 98.91 117.23 54.82 81.07 65.88 78.60 70.10 LREE 90.35 116.32 106.62 145.48 71.93 74.05 91.5 51.48 75.71 61.77 72.82 64.96 LREE/HREE 10.46 8.45 9.67 6.95 6.39 6.58 7.77 15.41 14.13 15.03 12.64 12.69 (La/Yb)N 13.82 9.81 10.65 5.89 6.35 6.27 6.44 21.07 17.63 19.84 17.4 16.8 δEu 1.00 1.20 1.04 1.67 1.46 1.42 1.11 1.07 0.88 0.93 0.97 0.98 Rb 67.00 13.00 39.00 29.00 22.00 17.05 39.00 85.30 66.30 69.80 54 48 Sr 549.0 424.0 1147. 766.0 768.0 850.52 583 508 626 492 785 726 Ba 408 421 596 350 336 1101.89 616 623 493 526 622 549 Nb 6.90 8.40 6.20 5.70 5.80 7.19 6.10 3.80 4.80 3.50 3.12 2.6 Ta 1.03 1.43 1.03 1.12 0.9 0.43 0.96 0.20 1.20 1.00 0.23 0.18 Zr 157 224 150 152 154 130.54 132 103.00 110.00 100.00 111 123 Hf 6.30 7.10 4.00 4.20 3.80 3.27 3.70 3.30 3.70 3.20 3.06 3.33 Th 5.73 3.82 5.92 1.87 1.81 1.67 4.21 12.95 7.9 8.36 4.9 4.2 Cr 75.8 80.3 139 32.3 37.4 460 29 40.00 30.00 20.00 13.3 11.9 Sc 6.32 12.50 10.20 11.20 13.10 10.86 5.53 5.88 5.00 U 1.48 1.16 1.46 0.70 0.70 0.76 1.41 2.77 1.82 2.86 0.80 0.64 注：Mg#=100×(MgO/40.31)/（MgO/40.3+TFeO/71.85）；主量元素含量单位为%，微量和稀土元素含量为10-6
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