Geochronology and Geochemistry of Mesozoic Igneous Rocks in the Hanjiayuanzi⁃Fulin Area of the Erguna Massif: Constraints on the Tectonic Evolution of the Mongol⁃Okhotsk Ocean
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摘要: 额尔古纳地块东缘韩家园子‒富林地区紧邻蒙古‒鄂霍茨克缝合带，其广泛出露的早侏罗世‒早白垩世火成岩对于完善蒙古‒鄂霍茨克洋俯冲‒闭合历史具有重要意义.本文对韩家园子‒富林地区的中生代火成岩进行岩相学、锆石U-Pb年代学、全岩主‒微量元素地球化学研究.LA-ICP-MS锆石U-Pb结果显示韩家园子钾长花岗岩锆石U-Pb年龄为196±2 Ma，代表其侵位时代为早侏罗世；富林地区光华组粗安岩锆石U-Pb年龄为122±2 Ma，暗示其结晶时代为早白垩世.早侏罗世钾长花岗岩为准铝质的Ⅰ型花岗岩，Mg#值较低（36），Nb/Ta比值（16.55~17.05）接近于原始地幔，暗示岩浆应来源于新生下地壳的部分熔融.同时，钾长花岗岩富集大离子亲石元素Rb、Ba、K，亏损高场强元素Nb、Ta、Ti，与典型弧型火成岩的地球化学特征相一致，结合区域上发育同时代准铝质或弱过铝质Ⅰ型花岗岩的事实，表明其可能与蒙古‒鄂霍茨克洋南向俯冲至额尔古纳地块有关.相比较下，早白垩世粗安岩具有较低的SiO2含量（59.67%~59.93%）和较高的Mg#值（42~43），同时富集大离子亲石元素Rb、Ba、K，亏损高场强元素Nb、Ta、Ti，富集Sr，亏损Th，暗示其可能是富集岩石圈地幔重熔的产物.鉴于区域上其他来源于富集岩石圈地幔的早白垩世钙碱性火山岩呈面状分布的特征，以及早白垩世A型花岗岩和变质核杂岩的存在，暗示粗安岩为蒙古‒鄂霍茨克洋闭合后伸展环境下的产物.结合区域最新火成岩和沉积岩资料，认为蒙古‒鄂霍茨克洋在早侏罗世‒早白垩世发生俯冲‒碰撞‒后碰撞作用，其在大兴安岭北部闭合时间应介于晚侏罗世末期和早白垩世早期（约150~140 Ma）.Abstract: The Hanjiayuanzi-Fulin area in the eastern Erguna Massif, located adjacent to the Mongol-Okhotsk suture zone, is characterized by numerous Early Jurassic to Early Cretaceous igneous rocks, which is important to reconstruct the subduction and closure history of the Mongol-Okhotsk Ocean. In this study, we present new petrology, LA-ICP-MS zircon U-Pb ages and whole-rock geochemical data for the Mesozoic igneous rocks from the Hanjiayuanzi-Fulin area. Zircon U-Pb ages of Hanjiayuanzi K-feldspar granite and Fulin trachyandesite are 196±2 Ma and 122±2 Ma, corresponding to the Early Jurassic and Early Cretaceous, respectively. The K-feldspar granite belongs to metaluminous Ⅰ-type granite, with low Mg# value (36) and Nb/Ta ratios (16.55-17.05) close to the primitive mantle, which could be derived from partial melting of the juvenile lower crust. It is enriched in large ion lithophile elements (LILEs, e.g., Rb, Ba, K), and depleted in high field strength elements (HFSEs, e.g., Nb, Ta, Ti), showing the geochemical characteristics of typical arc igneous rocks. Combined with the spatial distribution of contemporary metaluminous-weakly peraluminous Ⅰ-type granites, we propose that the Early Jurassic Hanjiayuanzi K-feldspar granite may be related to the southward subduction of the Mongol-Okhotsk Ocean beneath the Erguna massif. By contrast, the trachyandesite has lower SiO2 contents (59.67%-59.93%), higher Mg# values (42-43), and is also enriched in LILEs and depleted in HFSEs. Besides, it has an enrichment of Sr and depletion of Th, suggesting an origin from the enriched lithospheric mantle. Based on the regional distribution of Early Cretaceous calc-alkaline volcanic rocks, A-type granites and metamorphic core complexes, we suggest that the Early Cretaceous trachyandesite was formed in an extensional environment after the closure of the Mongol-Okhotsk Ocean. Combined with published data from igneous and sedimentary rocks, the closure time of the Mongol-Okhotsk Ocean in the northern Great Xing'an Range is suggested to be between latest Late Jurassic and earliest Early Cretaceous (~150-140 Ma).
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Key words:
- Mongol-Okhotsk Ocean /
- Erguna massif /
- Early Jurassic /
- Early Cretaceous /
- igneous rocks /
- geochemistry
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图 1 中亚造山带构造地质单元划分简图（a）、东北地区构造单元简图（b）和韩家园子‒富林地区地质图（c）
a. 据Liu et al.（2017）修改；b. 据Wu et al.（2007）修改；c. 修改自黑龙江省地质矿产局，1961，1：20万《兴隆沟幅》区域地质调查报告；黑龙江地质调查研究总院，2008，1：25万《兴隆幅》区域地质调查报告
Fig. 1. Simplified tectonic map of the Central Asian Orogenic Belt (a), simplified geological map of major tectonic units in the NE China(b), and geological map of the Hanjiayuanzi-Fulin area (c)
图 2 韩家园子‒富林地区中生代火成岩野外及镜下照片
图a、c、d为钾长花岗岩样品（18XL-54）；图b、e、f为粗安岩样品（18XL-83）. Afs.碱性长石；Q.石英；Bi.黑云母；Hb.角闪石；Pl.斜长石；Cpx.单斜辉石；Opx.斜方辉石
Fig. 2. Field photos and photomicrographs of the Mesozoic igneous rocks from the Hanjiayuanzi-Fulin area
图 3 韩家园子钾长花岗岩（a）和富林粗安岩（b）代表性锆石阴极发光图像
Fig. 3. CL images of representative zircons from the Hanjiayuanzi K-feldspar granite (a) and the Fulin trachyandesite (b)
图 4 韩家园子钾长花岗岩（a，b）和富林粗安岩（c，d）锆石U-Pb谐和图及年龄加权平均值
Fig. 4. Zircon U-Pb concordia diagrams and weighted average age diagrams of the Hanjiayuanzi K-feldspar granite (a, b) and the Fulin trachyandesite (c, d)
图 5 大兴安岭韩家园子‒富林地区火成岩主量元素图解
a. 火成岩硅‒全碱TAS图解，据Le Bas et al.（1986），碱性和亚碱性边界据Irvine and Baragar（1971）；b. SiO2⁃K2O图解，据Peccerillo and Taylor（1976）；c. 粗安岩的Zr/TiO2⁃SiO2关系，据Winchester and Floyd（1977）；d. 钾长花岗岩的A/CNK⁃A/NK图解
Fig. 5. Major element diagrams of igneous rocks in the Hanjiayuanzi⁃Fulin area, Great Xing'an Range
图 6 大兴安岭韩家园子‒富林地区火成岩稀土元素球粒陨石标准化图(a，c)和微量元素原始地幔标准化图(b，d)
球粒陨石和原始地幔数值据Sun and McDonough（1989）
Fig. 6. Chondrite-normalized REE patterns (a, c) and primitive-mantle normalized spidergrams (b, d) of igneous rocks from the Hanjiayuanzi-Fulin area, Great Xing'an Range
图 7 大兴安岭韩家园子地区早侏罗世钾长花岗岩岩石成因类型判别图
Fig. 7. 10 000×Ga/Al‒Na2O+K2O (a), 10 000×Ga/Al‒Nb (b), and Zr+Nb+Ce+Y‒(Na2O+K2O)/CaO (c) diagrams of the Early Jurassic K-feldspar granite of Hanjiayuanzi area, Great Xing'an Range
图 8 大兴安岭富林地区早白垩世粗安岩Ba/Th-La/Sm图解
Fig. 8. The Ba/Th-La/Sm diagram of the Fulin trachyandesite, Great Xing'an Range
图 9 大兴安岭韩家园子‒富林地区火成岩构造判别图
Fig. 9. Discrimination diagrams of igneous rocks from the Hanjiayuanzi-Fulin area, Great Xing'an Range
图 10 蒙古‒鄂霍茨克洋早侏罗世‒早白垩世构造演化模式
Fig. 10. Tectonic model of the Mongol-Okhotsk Ocean during the Early Jurassic to Early Cretaceous
表 1 韩家园子钾长花岗岩和富林粗安岩锆石LA⁃ICP⁃MS同位素分析结果
Table 1. LA⁃ICP⁃MS Zircon U⁃Pb analytical data of the Hanjiayuanzi K⁃feldspar granite and the Fulin trachyandesite
样品 Th U Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 谐和度(%) 含量（10‒6） 比值 1σ 比值 1σ 比值 1σ 年龄（Ma） 1σ 年龄（Ma） 1σ 年龄（Ma） 1σ *18XL-54-01 63 232 0.27 0.087 2 0.008 0 0.405 8 0.046 0 0.031 7 0.000 7 1 365 179 346 33 201 3 46 18XL-54-02 122 228 0.54 0.050 1 0.001 9 0.216 0 0.008 9 0.031 3 0.000 4 198 89 199 7 199 3 99 18XL-54-03 311 446 0.70 0.051 5 0.001 3 0.214 3 0.005 7 0.030 2 0.000 4 265 57 197 5 191 2 97 18XL-54-04 95 108 0.88 0.050 0 0.002 7 0.207 3 0.011 3 0.030 1 0.000 5 195 126 191 9 191 3 99 18XL-54-05 58 81 0.71 0.050 2 0.003 5 0.208 9 0.013 3 0.030 8 0.000 5 211 166 193 11 195 3 98 18XL-54-06 82 117 0.70 0.050 9 0.002 0 0.214 2 0.008 6 0.030 6 0.000 4 235 93 197 7 194 2 98 *18XL-54-07 256 631 0.41 0.064 1 0.004 1 0.290 0 0.018 4 0.032 9 0.000 4 743 131 259 14 209 3 78 18XL-54-08 211 179 1.18 0.049 9 0.002 4 0.208 6 0.010 3 0.030 5 0.000 5 187 111 192 9 194 3 99 18XL-54-09 196 296 0.66 0.049 9 0.001 7 0.210 9 0.007 5 0.030 7 0.000 4 191 114 194 6 195 2 99 18XL-54-10 242 452 0.54 0.048 4 0.001 4 0.212 6 0.006 9 0.031 8 0.000 5 117 66 196 6 202 2 96 18XL-54-11 62 88 0.71 0.048 5 0.002 7 0.207 3 0.011 0 0.031 1 0.000 5 124 126 191 9 197 3 96 18XL-54-12 360 298 1.21 0.049 2 0.002 0 0.213 9 0.008 7 0.031 8 0.000 4 167 96 197 7 202 3 97 18XL-54-13 122 141 0.87 0.049 2 0.001 9 0.213 3 0.007 4 0.031 8 0.000 5 167 89 196 6 202 3 97 18XL-54-14 127 182 0.7 0.049 9 0.002 2 0.211 6 0.010 9 0.030 6 0.000 5 187 102 195 9 194 3 99 18XL-54-15 141 207 0.68 0.050 9 0.001 9 0.212 3 0.009 0 0.030 3 0.000 5 235 87 195 8 192 2 98 18XL-54-16 106 115 0.92 0.049 1 0.002 7 0.209 9 0.011 1 0.031 4 0.000 5 154 130 193 9 199 3 97 18XL-54-17 56 107 0.52 0.049 8 0.002 5 0.207 6 0.010 7 0.030 3 0.000 6 183 117 192 9 193 3 99 18XL-54-18 105 255 0.41 0.050 6 0.001 7 0.222 1 0.008 3 0.031 7 0.000 5 233 76 204 7 201 3 98 18XL-54-19 73 96 0.76 0.052 5 0.003 1 0.210 5 0.012 1 0.029 5 0.000 5 309 137 194 10 187 3 96 18XL-54-20 124 130 0.96 0.050 7 0.004 1 0.207 2 0.019 3 0.030 8 0.000 8 233 186 191 16 195 4 97 18XL-54-21 102 122 0.84 0.050 0 0.002 8 0.209 8 0.012 0 0.030 3 0.000 5 198 131 193 10 193 3 99 *18XL-54-22 101 115 0.88 0.055 2 0.003 8 0.214 6 0.013 2 0.028 4 0.000 5 420 154 197 11 181 3 91 18XL-54-23 143 148 0.96 0.049 0 0.002 4 0.212 4 0.010 7 0.031 5 0.000 6 150 113 196 9 200 3 97 *18XL-54-24 104 133 0.78 0.052 6 0.004 1 0.210 5 0.019 9 0.028 8 0.000 5 322 178 194 17 183 3 94 *18XL-54-25 43 55 0.77 0.054 8 0.004 9 0.207 5 0.017 6 0.027 8 0.000 5 467 204 191 15 177 3 91 *18XL-83-01 349 175 1.99 0.045 7 0.002 8 0.120 4 0.007 3 0.019 1 0.000 5 -17 81 115 7 122 3 94 18XL-83-02 289 235 1.23 0.050 0 0.004 9 0.137 3 0.013 3 0.019 9 0.000 6 193 159 131 12 127 4 96 *18XL-83-03 100 184 0.54 0.055 5 0.001 6 0.519 2 0.016 0 0.067 9 0.001 7 430 32 425 11 424 10 99 18XL-83-04 249 187 1.33 0.048 6 0.003 5 0.127 9 0.009 1 0.019 1 0.000 5 126 108 122 8 122 3 99 *18XL-83-05 423 331 1.28 0.052 4 0.003 6 0.130 6 0.008 8 0.018 1 0.000 5 302 103 125 8 116 3 92 18XL-83-06 425 374 1.12 0.050 1 0.002 2 0.126 7 0.005 8 0.018 3 0.000 5 199 60 121 5 117 3 96 *18XL-83-07 226 205 1.10 0.051 6 0.002 6 0.130 2 0.006 5 0.018 3 0.000 5 268 68 124 6 117 3 94 18XL-83-08 85 110 0.77 0.047 5 0.004 3 0.124 9 0.011 3 0.019 1 0.000 6 76 142 119 10 122 4 97 18XL-83-09 79 103 0.77 0.048 7 0.003 0 0.128 5 0.007 8 0.019 1 0.000 5 134 89 123 7 122 3 99 18XL-83-10 925 570 1.62 0.049 9 0.002 1 0.127 9 0.005 5 0.018 6 0.000 5 191 55 122 5 119 3 97 *18XL-83-11 130 120 1.08 0.075 9 0.012 9 0.184 0 0.030 4 0.017 6 0.000 7 1 093 368 171 26 112 4 -12 *18XL-83-12 67 81 0.83 0.053 4 0.010 8 0.138 1 0.027 5 0.018 7 0.000 7 348 392 131 24 120 4 -32 18XL-83-13 1 002 665 1.51 0.050 9 0.001 6 0.138 4 0.004 6 0.019 7 0.000 5 234 37 132 4 126 3 95 *18XL-83-14 92 117 0.78 0.051 2 0.006 0 0.138 0 0.015 7 0.019 5 0.000 6 250 264 131 14 125 4 84 *18XL-83-15 111 131 0.85 0.051 4 0.002 9 0.140 2 0.008 0 0.019 8 0.000 5 261 82 133 7 126 3 94 *18XL-83-16 259 261 0.99 0.051 7 0.002 5 0.138 7 0.006 7 0.019 4 0.000 5 274 64 132 6 124 3 93 *18XL-83-17 282 234 1.21 0.054 8 0.001 7 0.508 6 0.016 7 0.067 3 0.001 7 403 34 418 11 420 10 99 *18XL-83-18 59 81 0.72 0.100 7 0.027 6 0.213 6 0.055 8 0.015 4 0.001 4 1 636 376 197 47 98 9 -1 18XL-83-19 156 159 0.98 0.049 7 0.003 0 0.128 4 0.007 6 0.018 8 0.000 5 179 88 123 7 120 3 97 18XL-83-20 72 88 0.81 0.047 1 0.004 1 0.131 3 0.011 4 0.020 2 0.000 6 53 134 125 10 129 4 96 *18XL-83-21 305 177 1.72 0.064 9 0.003 5 0.180 1 0.009 8 0.020 1 0.000 6 770 69 168 8 129 3 69 18XL-83-22 284 229 1.24 0.049 1 0.002 8 0.125 6 0.007 2 0.018 6 0.000 5 150 82 120 6 119 3 99 18XL-83-23 86 109 0.79 0.048 5 0.004 2 0.128 1 0.011 1 0.019 2 0.000 6 124 136 122 10 122 4 99 18XL-83-24 955 632 1.51 0.049 1 0.001 9 0.125 0 0.005 1 0.018 5 0.000 5 151 51 120 5 118 3 98 18XL-83-25 52 80 0.65 0.046 4 0.003 7 0.124 4 0.009 9 0.019 5 0.000 6 17 119 119 9 124 4 95 注：*点号不参与206Pb/238U年龄加权平均值计算. 
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表 2 韩家园子钾长花岗岩和富林粗安岩主量元素（%）和微量元素（10-6）测试结果
Table 2. Major (%) and trace (10-6) elemental data of the Hanjiayuanzi K-feldspar granite and the Fulin trachyandesite
样品号 18XL-55 18XL-56 18XL-84 18XL-85 岩性 钾长花岗岩 钾长花岗岩 粗安岩 粗安岩 SiO2 69.96 70.01 57.66 57.46 TiO2 0.41 0.40 0.81 0.82 Al2O3 15.04 15.22 17.19 17.27 Fe2O3T 2.62 2.57 5.82 5.86 MgO 0.72 0.72 2.09 2.20 MnO 0.07 0.07 0.11 0.11 CaO 1.86 1.89 3.78 3.56 Na2O 4.27 4.40 4.75 4.96 K2O 4.49 4.37 3.64 3.71 P2O5 0.12 0.11 0.34 0.34 LOI 0.48 0.51 3.35 3.07 Total 100.04 100.27 99.56 99.36 Mg# 36 36 42 43 Sc 6 5 11 12 V 28 27 75 109 Co 4 3 10 11 Ni 5.7 4.0 5.0 4.3 Ga 20.2 19.9 16.3 16.2 Rb 153.8 147.8 70.2 93.5 Ba 1 122 1 001 1 018 1 101 Th 20.2 14.7 4.6 5.0 U 2.9 2.2 1.2 1.2 Nb 16.7 16.4 7.5 7.7 Ta 1.0 1.0 0.5 0.5 Sr 263.7 257.5 748.7 822.8 Y 23.0 22.8 17.4 18.9 Zr 271.5 266.1 154.3 157.6 Hf 5.7 5.7 3.9 4.0 Cs 2.2 2.1 5.3 5.0 La 43.6 36.8 25.2 28.1 Ce 91.1 76.0 52.9 58.5 Pr 8.01 7.25 6.54 7.12 Nd 27.67 25.60 26.80 29.00 Sm 4.68 4.48 5.25 5.68 Eu 1.25 1.20 1.55 1.66 Gd 4.47 4.15 4.56 4.85 Tb 0.60 0.58 0.64 0.68 Dy 3.38 3.32 3.46 3.67 Ho 0.66 0.65 0.68 0.71 Er 2.05 2.01 1.95 2.07 Tm 0.29 0.29 0.26 0.28 Yb 2.03 1.98 1.76 1.81 Lu 0.29 0.30 0.27 0.28 (La/Sm)N 6.02 5.29 3.10 3.20 (La/Yb)N 15.43 13.30 10.29 11.11 A/CNK 0.98 0.99 0.92 0.92 A/NK 1.26 1.27 1.46 1.42 δEu 0.82 0.84 0.94 0.94 ∑REE 190.04 164.49 131.84 144.35
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