Formation age and geochemical characteristics of volcanic rocks in Manketou'ebo Formation in Kundu area of Ar Horqin Banner, Inner Mongolia
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摘要:
内蒙古赤峰市阿鲁科尔沁旗坤都地区满克头鄂博组火山岩为一套酸性火山熔岩与火山碎屑岩组合。用LA-ICP-MS技术测得流纹质晶屑凝灰岩中锆石的206Pb/238U年龄值为157.7±1.2Ma，时代为晚侏罗世晚期。地球化学分析结果显示，满克头鄂博组凝灰岩具有高Si、Al，低Ca、Mg的过铝质碱性火山岩特点，稀土元素配分曲线呈平缓右倾型，并具有明显的负Eu异常；富集大离子亲石元素Rb、K和高场强元素Th、U，亏损高场强元素Nb、Ti，反映火山岩为壳源成因类型。凝灰岩锆石εHf（t）=+2.6~+8.6，二阶段Hf模式年龄为590~925Ma，反映其源区物质主要为早古生代—新元古代增生的年轻地壳物质。满克头鄂博组凝灰岩具有A2型花岗岩特征，指示火山岩形成于造山后伸展环境，可能与蒙古-鄂霍茨克洋闭合造山后的岩石圈伸展作用密切相关。
Abstract:Volcanic rocks of Late Jurassic Manketou'ebo Formation in Kundu area of Inner Mongolia are mainly composed of a series of acid lava and volcaniclastic rocks. The LA-ICP-MS zircon U-Pb age is 157.7±1.2Ma (MSWD=0.39, n=26), which indicates its eruption in the late Late Jurassic. The geochemical analysis shows that these tuffs are peraluminous alkaline volcanic rocks with high Si, Al, low Ca, Mg, with the REE pattern gently inclined to the right and exhibiting negative Eu anomaly. The characteristics of trace elements suggest that the volcanic rocks are enriched in LILE (such as Rb and K) and HFSE (such as Th and U), and depleted in HFSE such as Nb and Ti, which implies that the source rocks are of crust genetic type. The zircons of the tuffs have εHf(t) values ranging from+2.6 to+8.6, with two-age Hf model age being 590~925Ma, which suggests that the magma for these volcanic rocks was derived from the newly accreted Early Paleozoic-Neoproterozoic juvenile crustal materials. The tuffs of Manketou'ebo Formation possess the characteristics of A2-type granites, indicating that they were formed in a post-orogenic extensional environment, which was possibly related to the lithosphere extension after the closure of the Mongol-Okhotsk Ocean.
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Keywords:
- volcanic rock /
- A-type granites /
- geochemical analysis /
- Late Jurassic /
- Manketou'ebo Formation
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致谢: 中国地质调查局沈阳地质调查中心基础地质研究室秦涛、施璐工程师，中国科学院海洋研究所郭鹏远研究员在样品测试和数据处理过程中给予大力支持，审稿专家对论文提出了建设性修改意见，在此一并表示感谢。
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图 1 研究区大地构造位置（a）和地质简图（b）
Figure 1. Tectonic location map (a) and simplified geological map (b) of the study area
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图 2 满克头鄂博组凝灰岩宏观（a、b）和显微照片（c、d，正交偏光）
Q—石英；Or—正长石
Figure 2. Macrophotographs(a, b) and microphotographs(c, d) of the tuffs of Late Jurassic Manketou'ebo Formation
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图 3 样品2016TW03部分锆石阴极发光图像
Figure 3. Cathodoluminescence images of selected zircons from sample 2016TW03
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图 4 流纹质晶屑凝灰岩(2016TW03)锆石U-Pb年龄谐和图
Figure 4. Zircon U-Pb concordia diagrams for the tuff sample (2016TW03)
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图 6 满克头鄂博组凝灰岩球粒陨石标准化稀土元素配分模式（a）及原始地幔标准化蛛网图（b）
（球粒陨石和原始地幔标准化比值据参考文献[27]）
Figure 6. Chondrite-nomalized REE (a) and primitive mantle-normalized trace-element (b) patterns for the tuffs of Manketou'ebo Formation
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图 7 满克头鄂博组凝灰岩t-εHf(t)图解
Figure 7. t-εHf(t) diagram for the tuffs of Manketou'ebo Formation
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图 8 A型花岗岩判别图[54]
A—A型花岗岩；I & S—I型和S型花岗岩；FG—分异的长英质花岗岩；OGT—未分异的M、I和S型花岗岩
Figure 8. A-type granite discrimination diagrams
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表 1 满克头鄂博组凝灰岩样品（2016TW03）LA-ICP-MS锆石U-Th-Pb分析结果
Table 1 LA-ICP-MS zircon U-Th-Pb data of the tuffs from Manketou'ebo Formation
点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 6 59 155 0.38 0.0503 0.003 0.1687 0.008 0.0249 0.0005 209 119 158.3 6.7 158.3 2.8 2 112 60 137 0.44 0.0508 0.003 0.1710 0.01 0.0251 0.0006 228 143 160.3 8.9 159.5 3.5 3 379 29 79 0.37 0.0506 0.003 0.1832 0.01 0.0249 0.0006 233 142 170.8 8.5 158.8 3.5 4 170 62 136 0.46 0.0484 0.004 0.1739 0.01 0.0241 0.0006 117 170 162.8 8.3 153.4 3.9 5 8 73 183 0.40 0.0475 0.002 0.1712 0.006 0.0251 0.0005 76 93 160.5 5.0 159.6 2.8 6 7 81 177 0.46 0.0500 0.002 0.1695 0.007 0.0249 0.0004 195 91 159.0 5.8 158.5 2.7 7 36 51 129 0.40 0.0493 0.003 0.1708 0.008 0.0250 0.0005 165 124 160.1 7.2 159.3 3.1 8 376 69 143 0.48 0.0770 0.003 0.2737 0.01 0.0261 0.0005 1120 116 245.7 9.0 165.8 2.9 9 385 42 103 0.41 0.0466 0.002 0.1571 0.008 0.0250 0.0006 32 119 148.2 7.1 159.4 3.6 10 5 42 133 0.32 0.0496 0.002 0.1681 0.008 0.0249 0.0005 176 111 157.8 6.6 158.2 3.2 11 278 336 362 0.93 0.0503 0.001 0.2850 0.008 0.0411 0.0007 209 92 254.6 6.3 259.6 4.2 12 68 83 208 0.40 0.0508 0.002 0.1715 0.007 0.0249 0.0005 232 62 160.7 6.2 158.2 3.4 13 176 65 142 0.46 0.0508 0.002 0.1732 0.007 0.0252 0.0005 232 98 162.2 5.9 160.6 2.8 14 5 49 118 0.41 0.0495 0.002 0.1693 0.008 0.0250 0.0005 172 107 158.8 7.0 158.9 2.8 15 470 69 138 0.50 0.0857 0.004 0.2982 0.01 0.0246 0.0006 1331 101 265.0 11.0 156.7 3.7 16 7 71 187 0.38 0.0489 0.003 0.1670 0.01 0.0247 0.0006 146 154 156.8 9.6 157.2 3.6 17 4 38 100 0.38 0.0497 0.003 0.1696 0.01 0.0250 0.0005 189 147 159.1 9.0 159.1 3.3 18 6 66 156 0.42 0.0500 0.003 0.1694 0.009 0.0249 0.0006 198 117 158.9 7.5 158.7 3.6 19 10 112 224 0.50 0.0494 0.002 0.1695 0.007 0.0249 0.0005 169 89 159.0 5.9 158.8 3.0 20 69 49 111 0.44 0.0487 0.003 0.1695 0.008 0.0249 0.0005 132 130 158.9 6.6 158.4 3.2 21 5 48 91 0.53 0.0486 0.003 0.1684 0.009 0.0246 0.0006 132 148 158.1 8.2 156.6 3.5 22 4 39 104 0.38 0.0502 0.002 0.1719 0.008 0.0242 0.0005 211 111 161.1 6.8 154.0 3.1 23 231 63 150 0.42 0.0491 0.002 0.1646 0.007 0.0243 0.0005 154 103 154.7 5.8 155.0 2.8 24 5 50 119 0.42 0.0488 0.003 0.1668 0.009 0.0248 0.0005 139 194 156.6 7.6 157.7 3.2 25 4 41 108 0.38 0.0499 0.002 0.1697 0.007 0.0250 0.0005 191 111 159.1 6.4 159.0 2.8 26 238 45 116 0.39 0.0501 0.003 0.1674 0.008 0.0242 0.0005 198 122 157.1 6.6 154.3 2.9 27 113 58 122 0.47 0.0481 0.003 0.1631 0.009 0.0245 0.0006 102 137 153.4 7.8 155.8 3.6 28 1022 102 184 0.55 0.0973 0.004 0.3327 0.01 0.0248 0.0004 1573 79 291.6 10.8 158.2 2.8 29 580 71 148 0.48 0.0504 0.003 0.1683 0.007 0.0246 0.0004 213 110 158.0 6.5 156.7 2.7 30 219 63 157 0.40 0.0498 0.003 0.1650 0.008 0.0242 0.0004 187 119 155.1 7.1 154.0 2.7 
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表 2 满克头鄂博组凝灰岩的主量、微量和稀土元素分析结果
Table 2 Major, trace and rare earth elements of the tuff samples from Late Jurassic Manketou'ebo Formation
元素 KDYQ5 KDYQ6 KDYQ12 KDYQ13 KDYQ14 KDYQ15 元素 KDYQ5 KDYQ6 KDYQ12 KDYQ13 KDYQ14 KDYQ15 SiO2 77.10 74.56 76.29 74.46 73.49 74.21 Sr 36.49 90.93 82.20 70.56 208.24 167.64 TiO2 0.17 0.18 0.23 0.19 0.25 0.15 V 14.19 11.53 21.67 16.33 18.24 13.58 Al2O3 13.63 13.27 13.25 13.51 14.18 13.73 Zn 29.39 23.37 33.15 33.43 104.81 71.85 Fe2O3 1.10 0.76 1.42 1.08 1.41 1.04 Zr 229.00 205.24 188.90 229.89 270.70 160.83 MnO 0.02 0.03 0.07 0.04 0.03 0.03 Sc 8.34 7.91 6.24 9.36 7.72 6.72 MgO 0.065 0.045 0.258 0.004 0.096 1.00 Cs 8.89 4.64 25.90 13.04 24.50 30.85 CaO 0.05 0.27 0.11 0.30 0.10 0.26 Co 2.08 2.58 3.19 1.73 3.81 4.57 Na2O 1.02 2.62 2.49 1.57 0.87 1.66 Ni 4.34 3.85 7.78 5.69 2.60 5.09 K2O 4.91 6.35 3.50 6.41 6.13 4.53 Hf 6.73 7.20 6.47 7.61 7.16 6.14 P2O5 0.03 0.03 0.02 0.03 0.05 0.02 Ta 1.05 0.95 0.77 1.01 0.56 1.18 烧失量 1.13 1.00 1.62 1.48 1.90 1.94 Th 15.24 13.93 9.97 15.26 12.36 19.32 总量 99.76 100.10 100.12 99.94 99.98 99.63 U 3.17 2.26 2.60 3.43 2.31 3.81 Na2O+K2O 5.93 8.97 6.00 7.99 7.00 6.19 Y 21.83 22.79 17.88 26.31 14.60 35.49 AR 2.53 4.93 2.63 3.74 2.93 2.59 La 26.72 48.82 43.11 60.20 42.20 40.22 A/CNK 1.92 1.14 1.64 1.34 1.71 1.69 Ce 75.76 98.91 86.95 111.73 71.96 88.24 A/NK 1.95 1.19 1.68 1.42 1.75 1.80 Pr 7.68 13.32 10.32 16.72 7.92 10.50 Rb 144.09 146.21 132.54 178.82 138.65 256.45 Nd 29.76 49.83 37.52 63.76 26.98 39.62 B 34.72 24.50 58.29 38.46 23.67 17.95 Sm 5.42 8.69 6.12 11.06 3.99 7.64 Sn 1.46 2.07 2.87 1.46 1.41 5.06 Eu 0.34 0.54 0.85 0.59 0.85 0.29 Ag 0.03 0.03 0.08 0.05 0.08 0.10 Gd 5.40 7.79 5.79 10.15 3.70 6.37 As 6.81 5.29 31.42 29.18 6.79 5.26 Tb 0.76 1.06 0.76 1.33 0.51 1.05 Sb 0.36 0.21 2.53 1.61 0.55 0.47 Dy 4.32 5.11 3.75 6.23 2.71 6.13 Hg 0.01 0.02 0.02 0.01 0.02 0.02 Ho 0.90 0.96 0.70 1.09 0.54 1.19 Bi 0.05 0.15 0.15 0.15 0.05 0.09 Er 2.62 2.70 2.01 3.10 1.58 3.47 Ba 222.39 374.83 441.07 338.50 500.02 302.87 Tm 0.45 0.44 0.33 0.48 0.28 0.58 Cr 13.89 24.32 14.50 13.61 11.52 17.85 Yb 2.91 2.73 2.14 3.10 1.94 4.02 Cu 4.59 3.36 6.21 6.11 4.76 9.00 Lu 0.43 0.42 0.32 0.45 0.29 0.59 Ga 22.23 21.62 19.60 21.72 19.70 19.08 ∑REE 163.47 241.29 200.67 289.99 165.45 209.90 Nb 11.96 11.37 11.80 12.53 9.10 12.44 (La/Yb)N 6.58 12.82 14.45 13.93 15.60 7.17 Pb 16.23 24.01 18.15 26.56 27.93 35.54 δEu 0.19 0.20 0.43 0.17 0.66 0.13 注：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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表 3 满克头鄂博组凝灰岩（2016TW03）锆石Lu-Hf同位素分析结果
Table 3 Lu-Hf isotopic compositions for the zircons of the tuffs from Manketou'ebo Formation
点号 t/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σm εHf(0) εHf(t) 2σ TDM1/(Hf) TDM2(Hf) fLu/Hf 2 160 0.021143 0.000877 0.282780 0.000020 0.29 3.6 0.7 666 871 -0.97 3 159 0.015974 0.000661 0.282753 0.000022 -0.69 2.6 0.8 701 925 -0.98 4 153 0.017885 0.000757 0.282811 0.000019 1.37 4.6 0.7 621 812 -0.98 5 160 0.017206 0.000738 0.282841 0.000020 2.44 5.8 0.7 579 750 -0.98 6 159 0.033550 0.001364 0.282915 0.000022 5.07 8.3 0.8 482 607 -0.96 9 159 0.016187 0.000703 0.282763 0.000021 -0.31 3.1 0.7 687 903 -0.98 13 161 0.025354 0.001048 0.282784 0.000020 0.43 3.6 0.7 664 865 -0.97 19 159 0.020731 0.000859 0.282782 0.000025 0.34 3.6 0.9 664 869 -0.97 20 158 0.020327 0.000868 0.282902 0.000024 4.60 7.8 0.9 494 632 -0.97 23 155 0.022202 0.000949 0.282923 0.000023 5.35 8.6 0.8 465 590 -0.97 25 159 0.026210 0.001117 0.282835 0.000019 2.22 5.4 0.7 593 767 -0.97 26 154 0.020703 0.000889 0.282771 0.000024 -0.04 3.2 0.9 680 891 -0.97
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