Post-orogeny of the Hegenshan suture zone: Zircon U-Pb age and geochemical constraints from volcanic rocks of the Manketouebo Formation
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摘要:
以出露于贺根山缝合带梅劳特乌拉蛇绿岩中的白音瑞满克头鄂博组火山岩为研究对象，通过野外地质调查、岩石学、地球化学和LA-ICP-MS锆石U-Pb年代学研究，探讨火山岩成因、构造环境与贺根山缝合带后造山作用。岩石地球化学研究表明，白音瑞地区满克头鄂博组火山岩主要为流纹岩，岩石具有较高SiO2、K2O和Na2O+K2O含量，以及较高Ga/Al值，相对贫CaO、MgO、Sr、Ba、Eu、Ti和P的特征。稀土元素含量较低，配分曲线为微弱右倾的海鸥式分布。岩石学和地球化学特征表明，该区满克头鄂博组流纹岩为A型流纹岩，形成于后造山伸展构造环境，为后造山A型花岗岩浆作用的产物。LA-ICP-MS锆石U-Pb同位素定年结果显示，该流纹岩的形成年龄为158.0±0.7Ma, 表明满克头鄂博组流纹岩喷发于晚侏罗世，反映了贺根山缝合带晚侏罗世后造山A型花岗岩浆作用事件。结合二连-贺根山缝合带石炭纪蛇绿岩、石炭纪—二叠纪岛弧岩浆岩和中三叠世—早白垩世后造山A型岩浆岩的时空分布与演化关系，认为二连-贺根山缝合带在中三叠世—早白垩世经历了后造山伸展作用演化过程。
Abstract:Based on field geological survey, petrology, geochemistry and LA-ICP-MS zircon U-Pb geochronology of the Baiyinrui volcanic rocks of the Manketouebo Formation exposed in the Meilaotewula SSZ-type ophiolite of the Hegenshan suture zone in Xi Ujimqin Banner of Inner Mongolia, this paper discusses the petrogenesis and tectonic setting of the volcanic rocks and post-orogeny of the Hegenshan suture zone. Petrogeochemical studies show that the volcanic rocks of the Manketouebo Formation in Baiyinrui area are mainly rhyolite with high SiO2, K2O and Na2O+K2O content, higher Ga/Al ratio and relatively poor CaO, MgO, Sr, Ba, Eu, Ti and P content. The REE content is relatively low. The REE distribution curve exhibits weak right-inclined gull-wing distribution. Petrological and geochemical characteristics show that the rhyolite of the Manketouebo Formation in this area is of Atype rhyolite origin, formed in post-orogenic extensional tectonic setting, and is a product of post-orogenic A-type magmatism, reflecting post-orogenic extensional process. The results of LA-ICP-MS zircon U-Pb isotope dating show that the rhyolite was formed at 158.0±0.7Ma, indicating that the rhyolite of the Manketouebo Formation erupted in the Late Jurassic, reflecting the Late Jurassic post-orogenic A-type magmatism event in the Hegenshan suture zone. Combined with the study of the time and space evolution of the Carboniferous ophiolites, Carboniferous-Permian island arc magmatic rocks and Middle Triassic-Early Cretaceous post-orogenic A-type magmatic rocks in the Erenhot-Hegenshan suture zone, it is considered that the Erenhot-Hegenshan suture zone underwent the evolution stage and dynamic process of post-orogenic extension during the Middle Triassic-Early Cretaceous after the final suture stretching in the Late Permian-Early Triassic.
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Key words:
- post-orogeny /
- Manketouebo Formation /
- A-type rhyolite /
- zircon U-Pb dating /
- Hegenshan suture zone
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图 9 满克头鄂博组流纹岩10000×Ga/Al对(K2O+Na2O)(a)、(K2O+Na2O)/CaO)(b)、K2O/MgO(c)和TFeO/MgO(d)判别图解[46]
Figure 9.
表 1 满克头鄂博组流纹岩（RL05）LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS U-Th-Pb dating results of zircons from the rhyolite in the Manketouebo Formation
点号 含量/10-6 Th/U 同位素比值 表面年龄/Ma Pb U 207Pb*206Pb* ±% 207Pb*235U ±% 206Pb*238U ±% 206Pb/238U 1 9 322 0.92 0.055 6.6 0.19 6.7 0.0250 0.88 159 ±1 2 7 228 0.78 0.052 11 0.18 11 0.0250 0.93 159 ±1 3 8 269 0.78 0.058 7.2 0.20 7.2 0.0246 0.86 157 ±1 4 4 137 0.62 0.051 19 0.18 18 0.0253 1.3 161 ±2 5 3 114 0.47 0.051 102 0.18 67 0.0250 2.4 159 ±4 6 10 322 0.85 0.052 7.2 0.18 7.2 0.0248 0.87 158 ±1 7 2 88 0.49 0.061 26 0.21 22 0.0252 2.3 160 ±4 8 6 194 0.75 0.064 10 0.22 10 0.0248 1.0 158 ±2 9 5 173 0.74 0.060 12 0.21 11 0.0250 1.1 159 ±2 10 6 198 0.73 0.052 13 0.18 12 0.0250 1.0 159 ±2 11 4 161 0.52 0.051 15 0.17 14 0.0245 1.0 156 ±2 12 6 221 0.70 0.055 10 0.19 10 0.0247 0.92 158 ±1 13 5 167 0.80 0.054 14 0.18 13 0.0248 1.1 158 ±2 14 9 290 0.83 0.054 6.4 0.18 6.4 0.0248 0.90 158 ±1 15 5 147 0.65 0.12 9.9 0.40 9.9 0.0256 1.4 163 ±2 16 7 239 0.91 0.064 7.3 0.22 7.3 0.0246 0.89 157 ±1 17 1 48 0.52 0.083 103 0.27 29 0.0242 3.0 154 ±5 18 2 65 0.063 0.106 27 0.37 23 0.0255 2.9 162 ±5 19 4 125 0.73 0.086 14 0.29 13 0.0247 1.5 157 ±2 20 3 85 0.80 0.126 18 0.43 16 0.0247 1.9 158 ±3 21 3 95 0.78 0.061 68 0.21 44 0.0250 1.7 159 ±3 22 5 173 1.04 0.058 32 0.19 32 0.0241 2.1 153 ±3 23 7 232 0.96 0.051 9.9 0.17 9.9 0.0244 0.94 155 ±1 24 6 195 0.86 0.058 9.1 0.20 9.1 0.0248 1.1 158 ±2 注：误差为1σ；Pb*指示放射成因铅。实验测试在中国地质调查局天津地质调查中心完成 
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表 2 满克头鄂博组流纹岩主量、微量和稀土元素分析结果
Table 2. Major element, trace element and REE analyses of the rhyolites in the Manketouebo Formation
样品号
岩性RL01
流纹岩RL02
流纹岩RL03
流纹岩RL05
流纹岩RL06
流纹岩世界A型花岗岩平均
（148）[40]中国A型花岗岩平均
（197）[40]SiO2 77.08 76.33 76.92 76.12 75.92 73.81 73.55 Al2O3 12.40 12.42 12.65 12.65 12.86 12.4 12.81 TiO2 0.051 0.063 0.041 0.039 0.088 0.26 0.23 Fe2O3 0.54 0.89 0.53 0.87 0.79 1.24 1.42 FeO 0.26 0.12 0.12 0.43 0.41 1.58 1.18 CaO 0.44 0.77 0.33 0.39 0.44 0.75 0.82 MgO 0.081 0.042 0.044 0.048 0.11 0.2 0.27 K2O 4.54 4.75 4.57 4.42 4.89 4.65 4.69 Na2O 3.93 3.90 4.20 3.97 3.48 4.07 3.76 MnO 0.011 0.011 0.010 0.018 0.012 0.06 0.09 P2O5 0.021 0.018 0.021 0.017 0.022 0.04 0.07 烧失量 0.64 0.67 0.55 0.87 0.87 总量 99.98 99.98 99.97 99.85 99.89 Ba 25.20 21.50 32.90 31.40 29.80 352 235.96 Rb 302.00 345.40 276.60 184.70 196.30 169 269.69 Sr 7.10 6.90 16.50 10.21 9.94 48 57.54 Pb 17.70 16.90 13.20 16.50 21.50 24 Cr 3.70 3.20 3.30 6.30 5.60 Co 0.30 0.20 0.30 0.80 0.90 Ni 1.80 2.70 2.50 3.20 3.10 < 1 V 3.10 1.60 2.30 2.50 4.10 6 Zr 115.90 89.60 112.20 284.20 231.10 528 333.77 Hf 6.71 4.17 6.56 8.94 9.86 Sc 2.20 1.80 1.30 1.70 1.90 4 Nb 22.56 23.05 15.40 15.23 16.32 37 34.93 Ta 4.01 2.88 2.84 5.84 3.65 Th 15.43 29.98 31.31 29.61 14.25 23 U 3.27 5.37 3.27 6.57 4.21 5 Cs 5.98 5.13 5.67 9.46 8.25 Ga 34.20 34.70 27.90 32.50 27.50 24.6 18.54 Y 60.67 72.91 35.72 23.98 19.24 75 54.03 La 8.78 21.80 24.99 26.96 27.21 Ce 26.66 56.82 40.29 49.87 59.15 Pr 4.66 8.47 9.41 7.96 9.02 Nd 21.61 36.52 39.21 27.54 34.26 Sm 7.87 10.64 10.18 6.84 6.23 Eu 0.061 0.058 0.11 0.12 0.12 Gd 6.46 8.82 6.84 5.13 4.97 Tb 1.51 1.85 1.31 0.89 0.84 Dy 9.64 10.94 7.08 6.24 5.21 Ho 2.00 2.20 1.26 1.14 0.97 Er 5.64 5.84 3.33 2.85 3.12 Tm 1.05 1.00 0.60 0.63 0.54 Yb 6.23 5.69 3.65 3.14 3.24 Lu 1.12 0.83 0.69 0.79 0.68 ΣREE 103.29 171.48 148.95 140.10 155.56 δEu 0.03 0.02 0.04 0.06 0.06 (La/Yb)N 0.95 2.58 4.62 5.79 5.66 Ga/Al 5.21 5.28 4.17 4.86 3.74 3.75 注：主量元素含量单位为%，稀土、微量元素含量单位为10-6
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