Geochronology of Ershi'erzhan Formation Sandstone in Mohe Basin and Tectonic Environment of Its Provenance
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摘要: 大兴安岭北部的漠河盆地广泛发育中生界二十二站组砂岩，其形成时代一直备受争议.首次利用碎屑锆石LA-ICP-MS U-Pb法测年对其形成时代作出较为精确的限定，并结合地球化学特征对其物源区及大地构造背景进行了探讨.研究结果表明，二十二站组砂岩碎屑物磨圆度较低、分选差，表现出源区相对不稳定，快速剥蚀、搬运及沉积的特征.锆石颗粒粗大，具有清晰的震荡环带，Th/U值为0.35～1.07，为典型的岩浆锆石.测年结果显示，90个测点年龄主要分布在3个群落：152～170Ma，峰值年龄约为158Ma，这一年龄区间揭示了二十二站组沉积成岩的下限为晚侏罗世；179～193Ma，峰值年龄约为190Ma；205～214Ma，峰值年龄约为210Ma.3个年龄峰值为蒙古-鄂霍茨克洋演化过程中一系列岩浆活动的地质记录，其中210Ma与190Ma峰值年龄与盆地南缘额尔古纳地块晚三叠世、早侏罗世的岩浆事件相吻合，而158Ma峰值年龄则对应于盆地北缘晚侏罗世的岩浆事件.主、微量元素构造判别图解揭示其物源区具有活动大陆边缘的特征，同时锆石定年数据显示其没有任何前中生代的碎屑物，暗示了该3期岩浆岩均形成于额尔古纳地块北缘的中生代活动大陆边缘环境，并为二十二站组的形成提供了主要碎屑物质.由此说明，二十二站组砂岩形成于晚侏罗世蒙古-鄂霍茨克洋闭合后的造山过程中，漠河盆地南北两侧物源区快速剥蚀、快速搬运与快速沉积的环境.Abstract: o address the controversy of the Ershi'erzhan Formation sandstone formation ages in the Mohe basin of the northern Great Khingan Range, this study presents an accurate limit to its formation ages using the LA-ICP-MS detrital zircon U-Pb dating for the first time in this paper, and discusses its provenance and tectonic setting combined with the geochemistry of major and trace elements. The results show that the fragmental material in sandstone has poor psephicity and sorting, indicating that source region is relatively unstable with characteristics of rapid denudation, transportation and sedimentation. The grains of detrital zircons are big with clear oscillatory zoning, and Th/U values range from 0.35-1.07, which is indicative of a magmatic origin. Zircon U-Pb dating results show that 90 dating data are distributed in the following three periods, namely, 152-170Ma with the peak of 158Ma, standing for the lower limit of Ershi'erzhan Formation sedimentary rocks at Late Jurassic; 179-193Ma with the peak of 190Ma and 205-214Ma with the peak of 210Ma. The three peak ages are the evolution records of the Mongolia-Okhotsk ocean. The peak ages of 210Ma and 190Ma are consistent with the Late Triassic and Early Jurassic magmatic events of south margin of the basin in the Erguna massif, the peak age of 158Ma fits the Late Jurassic magmatic event of north margin of the basin. The geochemical diagrams of major and trace elements reveal that the provenance has the background of active continental margin. Meanwhile, the zircon dating shows that there is no Pre-Mesozoic clastics in the Ershi'erzhan Formation. It suggest that these were generated within an active continental margin setting at the north margin of the Erguna massif in Mesozoic, and provided the most clastics for the Ershi'erzhan Formation. Combining with the previous studies, it is concluded that the Ershi'erzhan Formation sandstone was formed in Late Jurassic under the environment of rapid denudation, transportation and sedimentation, controlled by the uplift of the Mongolia-Okhotsk orogenic belt, indicating that the eastern Mongolia-Okhotsk ocean has already closed in Late Jurassic.
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Key words:
- Mohe basin /
- Ershi'erzhan Formation /
- sandstone /
- detrital zircon /
- geochemistry /
- active continental margin /
- Mongolia-Okhotsk ocean
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图 1 漠河盆地区域构造分区(a)、漠河盆地及邻区上阿穆尔盆地区域地质图(b)和砂宝斯金矿区地质图(c)
图a据和钟铧等(2008a)修改;图b据和政军等(2003)修改;图c据齐金忠等(2000)
Fig. 1. Regional tectonic subdivisions of the Mohe basin(a),regional geological sketch of the Mohe basin and Amur basin(b)and Shabaosi gold deposit(c)
图 2 二十二站组砂岩显微镜下照片(正交偏光)
Q.石英;Pl.斜长石;Pth.条纹长石;Mic.微斜长石;Lv.火成岩岩屑;Bt.黑云母;Cal.方解石;Mus.白云母
Fig. 2. Micrographs of the Ershi'erzhan Formation sandstone
图 3 二十二站组砂岩碎屑锆石阴极发光照片
Fig. 3. CL images of detrital zircons from the Ershi'erzhan Formation sandstone
图 4 二十二站组砂岩碎屑锆石的U-Pb年龄谐和图(a)和年龄概率分布(b)
Fig. 4. Diagrams of U-Pb concordia ages of zircons for the Ershi'erzhan Formation sandstone(a),and probability density distribution(b)
图 5 二十二站组砂岩岩石地球化学分类图解
Fig. 5. Geochemical classification diagrams of the Ershi'erzhan Formation sandstone
图 6 二十二站组砂岩球粒陨石(a)、全球平均大陆上地壳(b)标准化稀土元素配分曲线和原始地幔标准化微量元素蛛网图(c)
Fig. 6. Chondrite-normalized(a),UCC-normalized(b)rare earth element patterns and primitive mantle-normalized trace element spider diagram(c)of the Ershi'erzhan Formation sandstone
图 7 二十二站组砂岩源区母岩性质判别图解
Fig. 7. Discrimination diagrams of mother rock for the Ershi'erzhan Formation sandstone
图 8 二十二站组碎屑锆石年龄与额尔古纳地块岩浆锆石年龄对比
额尔古纳地块中生代花岗岩锆石年龄数据引自Wu et al.(2011)
Fig. 8. Probability curves of ages for detrital zircons from the Ershi'erzhan Formation sandstone and magmatic zircons from the Erguna massif
图 9 二十二站组砂岩物源区主量元素(a,b)和微量元素(c,d,e)构造环境判别图解
Fig. 9. Tectonic setting discrimination diagrams of the major elements(a,b)and trace elements(c,d,e)for the provenance from the Ershi'erzhan Formation sandstone
图 10 二十二站组砂岩形成构造背景示意
Fig. 10. Sketch showing the forming tectonic setting of the Ershi'erzhan Formation
表 1 二十二站组砂岩碎屑锆石LA-ICP-MS U-Pb测年分析结果
Table 1. Detrital zircon LA-ICP-MS U-Pb analytical results of the Ershi'erzhan Formation sandstones
编号 Pb(10-6) Th(10-6) U(10-6) Th/U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 年龄(Ma) 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ SBS-N1-01 6.1 104 189 0.55 0.05021 0.00347 0.16486 0.01104 0.02382 0.00041 205 158 155 10 152 3 151 2 SBS-N1-02 9.9 224 329 0.68 0.05228 0.00265 0.17320 0.00734 0.02403 0.00040 298 66 162 6 153 3 150 3 SBS-N1-03 4.8 83 153 0.54 0.04627 0.00275 0.15568 0.00889 0.02440 0.00040 12 130 147 8 155 3 157 4 SBS-N1-04 8.8 158 258 0.61 0.04742 0.00335 0.15935 0.01089 0.02437 0.00043 70 157 150 10 155 3 156 3 SBS-N1-05 8.8 206 281 0.73 0.05127 0.00253 0.17193 0.00694 0.02432 0.00038 253 64 161 6 155 2 157 3 SBS-N1-06 7.1 127 233 0.55 0.05224 0.00237 0.17577 0.00634 0.02440 0.00038 296 54 164 5 155 2 169 3 SBS-N1-07 24.6 778 794 0.98 0.05735 0.00205 0.19246 0.00445 0.02434 0.00035 505 27 179 4 155 2 104 2 SBS-N1-08 4.6 129 130 0.99 0.04926 0.00308 0.16685 0.00924 0.02456 0.00043 160 94 157 8 156 3 166 4 SBS-N1-09 10.0 199 307 0.65 0.04989 0.00247 0.16873 0.00692 0.02453 0.00040 190 65 158 6 156 3 143 3 SBS-N1-10 8.7 197 278 0.71 0.04973 0.00211 0.16802 0.00545 0.02450 0.00037 182 48 158 5 156 2 153 3 SBS-N1-11 6.7 134 222 0.61 0.05007 0.00239 0.16945 0.00658 0.02454 0.00039 198 61 159 6 156 2 152 3 SBS-N1-12 8.3 164 269 0.61 0.05248 0.00231 0.17868 0.00605 0.02469 0.00037 306 50 167 5 157 2 154 3 SBS-N1-13 7.8 144 242 0.59 0.05231 0.00258 0.17810 0.00724 0.02469 0.00040 299 63 166 6 157 3 167 4 SBS-N1-14 7.4 151 235 0.64 0.04883 0.00217 0.16640 0.00582 0.02471 0.00038 140 53 156 5 157 2 170 3 SBS-N1-15 6.8 135 210 0.64 0.05195 0.00284 0.17654 0.00828 0.02464 0.00042 283 76 165 7 157 3 152 4 SBS-N1-16 9.6 179 298 0.60 0.05103 0.00266 0.17399 0.00764 0.02473 0.00041 242 70 163 7 157 3 154 4 SBS-N1-17 11.5 280 357 0.78 0.05016 0.00204 0.17204 0.00518 0.02488 0.00037 202 43 161 4 158 2 150 2 SBS-N1-18 11.1 207 353 0.59 0.04966 0.00212 0.17042 0.00554 0.02488 0.00037 179 48 160 5 158 2 161 3 SBS-N1-19 5.7 100 175 0.57 0.05227 0.00310 0.17838 0.00927 0.02475 0.00044 297 86 167 8 158 3 164 5 SBS-N1-20 11.3 259 317 0.82 0.05070 0.00270 0.17301 0.00779 0.02475 0.00041 227 73 162 7 158 3 156 4 SBS-N1-21 7.6 193 218 0.88 0.04752 0.00264 0.16290 0.00781 0.02486 0.00042 75 75 153 7 158 3 151 3 SBS-N1-22 7.8 140 242 0.58 0.04797 0.00267 0.16372 0.00790 0.02475 0.00041 98 78 154 7 158 3 148 4 SBS-N1-23 11.5 260 358 0.73 0.04860 0.00198 0.16608 0.00502 0.02478 0.00037 129 43 156 4 158 2 152 2 SBS-N1-24 7.2 131 227 0.58 0.04908 0.00266 0.16758 0.00777 0.02477 0.00041 152 77 157 7 158 3 147 4 SBS-N1-25 9.1 159 274 0.58 0.04936 0.00273 0.16893 0.00800 0.02482 0.00042 165 79 158 7 158 3 161 4 SBS-N1-26 8.1 139 256 0.54 0.05382 0.00238 0.18378 0.00633 0.02476 0.00038 364 50 171 5 158 2 187 4 SBS-N1-27 11.3 220 326 0.68 0.04904 0.00277 0.16882 0.00823 0.02496 0.00043 150 81 158 7 159 3 160 4 SBS-N1-28 9.1 189 272 0.70 0.05089 0.00245 0.17497 0.00687 0.02494 0.00040 236 61 164 6 159 3 152 3 SBS-N1-29 14.0 291 428 0.68 0.04955 0.00202 0.17058 0.00514 0.02496 0.00037 174 43 160 4 159 2 161 3 SBS-N1-30 9.5 234 288 0.81 0.04710 0.00223 0.16195 0.00624 0.02494 0.00039 54 56 152 5 159 2 144 3 SBS-N1-31 11.8 254 363 0.70 0.04762 0.00200 0.16392 0.00524 0.02496 0.00037 80 48 154 5 159 2 159 3 SBS-N1-32 10.4 183 317 0.58 0.05203 0.00263 0.17869 0.00749 0.02491 0.00041 287 66 167 6 159 3 173 4 SBS-N1-33 10.7 188 329 0.57 0.05101 0.00225 0.17581 0.00602 0.02499 0.00038 241 51 164 5 159 2 179 3 SBS-N1-34 11.0 225 349 0.65 0.05099 0.00210 0.17524 0.00534 0.02492 0.00037 240 43 164 5 159 2 154 3 SBS-N1-35 18.2 436 520 0.84 0.04841 0.00204 0.16691 0.00528 0.02500 0.00037 119 47 157 5 159 2 160 3 SBS-N1-36 6.9 156 192 0.81 0.04575 0.00306 0.15757 0.00950 0.02498 0.00045 15 95 149 8 159 3 154 4 SBS-N1-37 10.4 210 329 0.64 0.04877 0.00209 0.16784 0.00549 0.02496 0.00037 137 49 158 5 159 2 157 3 SBS-N1-38 12.9 208 421 0.49 0.04840 0.00190 0.16719 0.00469 0.02505 0.00036 119 39 157 4 159 2 161 3 SBS-N1-39 8.7 193 250 0.77 0.04788 0.00276 0.16460 0.00830 0.02493 0.00043 93 81 155 7 159 3 156 4 SBS-N1-40 7.4 146 222 0.66 0.05000 0.00316 0.17303 0.01056 0.02510 0.00041 195 145 162 9 160 3 160 2 SBS-N1-41 12.2 277 377 0.74 0.05138 0.00210 0.17779 0.00533 0.02509 0.00037 258 42 166 5 160 2 156 3 SBS-N1-42 11.2 309 308 1.00 0.04878 0.00358 0.16863 0.01203 0.02507 0.00043 137 166 158 10 160 3 160 2 SBS-N1-43 10.5 187 313 0.60 0.04926 0.00267 0.17055 0.00787 0.02511 0.00042 160 76 160 7 160 3 173 4 SBS-N1-44 9.1 117 295 0.40 0.05322 0.00241 0.18679 0.00662 0.02545 0.00039 338 53 174 6 162 2 194 4 SBS-N1-45 6.8 123 201 0.61 0.05172 0.00255 0.18930 0.00767 0.02654 0.00042 273 64 176 7 169 3 181 4 SBS-N1-46 11.1 213 330 0.64 0.05130 0.00224 0.18882 0.00632 0.02669 0.00040 254 49 176 5 170 3 165 3 SBS-N1-47 6.4 99 190 0.52 0.05105 0.00430 0.19839 0.01552 0.02818 0.00061 243 138 184 13 179 4 184 8 SBS-N1-48 10.1 167 298 0.56 0.05207 0.00265 0.20763 0.00875 0.02892 0.00047 288 66 192 7 184 3 176 4 SBS-N1-49 6.8 144 197 0.73 0.04950 0.00303 0.19910 0.01074 0.02917 0.00051 172 92 184 9 185 3 187 5 SBS-N1-50 23.9 569 605 0.94 0.05175 0.00211 0.20896 0.00626 0.02928 0.00043 274 42 193 5 186 3 194 3 SBS-N1-51 10.8 156 301 0.52 0.05124 0.00235 0.20772 0.00759 0.02940 0.00046 252 55 192 6 187 3 199 4 SBS-N1-52 20.8 38 601 0.51 0.04898 0.00230 0.19916 0.00759 0.02949 0.00047 147 59 184 6 187 3 181 4 SBS-N1-53 8.1 128 197 0.65 0.04634 0.00273 0.18858 0.01071 0.02951 0.00046 15 129 175 9 187 3 189 4 SBS-N1-54 6.6 133 185 0.72 0.05043 0.00326 0.20519 0.01186 0.02951 0.00054 215 100 190 10 187 3 174 5 SBS-N1-55 17.1 233 453 0.51 0.05162 0.00217 0.21053 0.00663 0.02958 0.00044 269 45 194 6 188 3 197 4 SBS-N1-56 8.5 105 229 0.46 0.05064 0.00227 0.20802 0.00734 0.02979 0.00046 224 53 192 6 189 3 195 4 SBS-N1-57 14.2 180 385 0.47 0.04945 0.00218 0.20300 0.00842 0.02977 0.00044 169 102 188 7 189 3 189 2 SBS-N1-58 13.5 251 392 0.64 0.04979 0.00226 0.20380 0.00736 0.02969 0.00046 185 55 188 6 189 3 216 5 SBS-N1-59 11.3 173 292 0.59 0.05089 0.00261 0.20910 0.01024 0.02980 0.00046 236 120 193 9 189 3 189 2 SBS-N1-60 8.6 134 228 0.59 0.05063 0.00226 0.20933 0.00733 0.02998 0.00046 224 53 193 6 190 3 181 4 SBS-N1-61 8.8 185 236 0.78 0.04983 0.00244 0.20590 0.00832 0.02996 0.00048 187 64 190 7 190 3 181 4 SBS-N1-62 9.8 197 271 0.73 0.04874 0.00235 0.20130 0.00795 0.02996 0.00048 135 63 186 7 190 3 196 4 SBS-N1-63 11.9 273 290 0.94 0.06720 0.00287 0.27764 0.00900 0.02996 0.00047 844 42 249 7 190 3 218 4 SBS-N1-64 10.0 191 260 0.73 0.06220 0.00261 0.25710 0.00814 0.02997 0.00046 681 42 232 7 190 3 219 4 SBS-N1-65 15.1 236 423 0.56 0.05581 0.00219 0.23040 0.00647 0.02994 0.00044 445 37 211 5 190 3 209 4 SBS-N1-66 23.2 310 625 0.50 0.05006 0.00175 0.20809 0.00454 0.03014 0.00042 198 26 192 4 191 3 190 3 SBS-N1-67 24.8 339 671 0.51 0.05176 0.00178 0.21465 0.00450 0.03007 0.00042 275 24 197 4 191 3 200 3 SBS-N1-68 19.2 285 536 0.53 0.04914 0.00184 0.20366 0.00524 0.03006 0.00043 155 34 188 4 191 3 191 3 SBS-N1-69 3.3 51 85 0.60 0.05213 0.00461 0.21571 0.01786 0.03001 0.00067 291 147 198 15 191 4 208 8 SBS-N1-70 28.7 434 767 0.57 0.04938 0.00169 0.20505 0.00434 0.03011 0.00042 166 25 189 4 191 3 192 3 SBS-N1-71 13.9 195 368 0.53 0.04844 0.00210 0.20074 0.00676 0.03006 0.00046 121 51 186 6 191 3 185 4 SBS-N1-72 11.4 194 302 0.64 0.04976 0.00208 0.20583 0.00653 0.03000 0.00045 184 46 190 5 191 3 185 3 SBS-N1-73 12.4 217 338 0.64 0.05108 0.00216 0.21162 0.00679 0.03004 0.00045 244 46 195 6 191 3 190 3 SBS-N1-74 19.2 305 503 0.61 0.05227 0.00196 0.21732 0.00561 0.03015 0.00044 297 33 200 5 191 3 185 3 SBS-N1-75 23.4 364 631 0.58 0.05180 0.00189 0.21456 0.00516 0.03004 0.00043 277 30 197 4 191 3 200 3 SBS-N1-76 6.7 163 152 1.07 0.05050 0.00281 0.21154 0.01013 0.03038 0.00051 218 80 195 8 193 3 200 4 SBS-N1-77 19.5 411 450 0.91 0.05079 0.00311 0.22586 0.01337 0.03225 0.00051 232 142 207 11 205 3 204 2 SBS-N1-78 20.1 285 519 0.55 0.05138 0.00196 0.22920 0.00615 0.03235 0.00047 258 36 210 5 205 3 203 3 SBS-N1-79 17.5 211 453 0.47 0.05082 0.00202 0.22773 0.00650 0.03250 0.00048 233 39 208 5 206 3 222 4 SBS-N1-80 6.8 137 161 0.85 0.05240 0.00313 0.23654 0.01238 0.03273 0.00058 303 87 216 10 208 4 207 5 SBS-N1-81 15.2 249 381 0.66 0.05073 0.00192 0.23068 0.00607 0.03297 0.00048 229 35 211 5 209 3 214 3 SBS-N1-82 31.0 291 821 0.35 0.05162 0.00181 0.23443 0.00507 0.03293 0.00046 269 26 214 4 209 3 214 3 SBS-N1-83 21.9 293 550 0.53 0.05388 0.00244 0.24484 0.01045 0.03295 0.00050 366 105 222 9 209 3 207 3 SBS-N1-84 17.9 261 439 0.60 0.05059 0.00192 0.23030 0.00606 0.03301 0.00048 222 35 210 5 209 3 223 3 SBS-N1-85 14.7 162 397 0.41 0.05061 0.00213 0.23124 0.00731 0.03313 0.00050 223 45 211 6 210 3 225 5 SBS-N1-86 11.6 130 303 0.43 0.04864 0.00199 0.22253 0.00683 0.03318 0.00050 131 44 204 6 210 3 194 4 SBS-N1-87 20.1 299 517 0.58 0.05125 0.00205 0.23414 0.00678 0.03313 0.00049 252 40 214 6 210 3 208 4 SBS-N1-88 24.6 390 585 0.67 0.05580 0.00202 0.25501 0.00608 0.03314 0.00047 444 29 231 5 210 3 227 3 SBS-N1-89 28.3 421 686 0.61 0.05026 0.00180 0.23183 0.00529 0.03345 0.00047 207 28 212 4 212 3 218 3 SBS-N1-90 17.8 269 357 0.75 0.05060 0.00259 0.23509 0.01004 0.03369 0.00055 223 68 214 8 214 3 224 5 
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表 2 二十二站组砂岩主量元素、微量元素及稀土元素分析结果
Table 2. Major, trace and rare earth elements compositions of the Ershi'erzhan Formation sandstones
样品号 SBS-N1-B1 SBS-N1-B2 SBS-N1-B3 SBS-N1-B4 SBS-N1-B5 SBS-N1-B6 SBS-N1-B7 SBS-N1-B8 SBS-N1-B9 SBS-N1-B10 SiO2 73.94 72.08 65.85 70.19 71.39 72.07 71.50 67.26 70.98 68.28 TiO2 0.19 0.27 0.40 0.33 0.18 0.23 0.25 0.43 0.24 0.40 Al2O3 14.22 13.96 13.96 13.96 12.73 13.55 14.20 15.11 13.88 13.50 Fe2O3 1.91 1.79 3.73 3.13 2.06 1.70 2.47 3.40 2.26 2.90 FeO 0.96 1.36 2.98 2.82 1.66 1.44 1.00 2.75 1.92 1.95 MnO 0.07 0.09 0.13 0.11 0.12 0.09 0.09 0.11 0.09 0.10 MgO 0.22 0.41 0.91 0.41 0.48 0.51 0.22 0.97 0.41 0.64 CaO 0.28 0.75 2.59 0.98 2.63 1.42 1.32 1.99 1.33 2.88 Na2O 4.47 4.42 3.66 4.25 4.76 4.82 4.33 3.60 4.34 3.71 K2O 3.43 4.39 3.61 3.54 2.54 2.78 3.02 3.66 3.23 2.89 P2O5 0.06 0.06 0.11 0.08 0.06 0.07 0.07 0.11 0.07 0.08 LOI 1.13 1.70 4.84 2.84 2.92 2.64 2.42 3.22 2.99 4.37 Total 100.88 101.28 102.77 102.65 101.53 101.31 100.89 102.61 101.74 101.70 Fe2O3T 2.98 3.30 7.04 6.26 3.90 3.30 3.58 6.46 4.39 5.07 K2O/Na2O 0.77 0.99 0.99 0.83 0.53 0.58 0.70 1.02 0.74 0.78 Fe2O3/K2O 0.56 0.41 1.03 0.88 0.81 0.61 0.82 0.93 0.70 1.00 F1 -1.42 -3.02 -0.82 -1.01 0.09 -0.82 -0.05 -0.97 -0.90 -0.24 F2 0.46 1.77 -0.01 0.21 -0.08 -0.15 0.09 -0.15 0.22 -0.41 La 18.1 43.7 37.7 65.5 18.6 24.1 28.5 38.4 36.7 78.4 Ce 37.0 82.2 75.4 123.0 34.9 46.9 51.9 75.1 68.8 151.0 Pr 4.03 8.70 8.30 12.70 3.79 5.05 5.68 8.12 7.25 16.20 Nd 14.5 28.8 28.7 41.7 13.8 17.9 19.9 29.1 24.9 54.3 Sm 2.48 4.32 4.30 5.37 2.53 2.97 3.09 4.44 3.55 7.83 Eu 0.58 0.64 0.71 0.64 0.48 0.49 0.57 0.80 0.59 1.17 Gd 1.87 2.90 3.74 3.94 1.75 2.12 2.71 3.97 2.89 5.49 Tb 0.36 0.54 0.56 0.66 0.36 0.40 0.44 0.59 0.51 0.80 Dy 1.85 2.59 3.37 3.16 1.69 2.06 2.28 3.34 2.31 4.14 Ho 0.34 0.52 0.64 0.60 0.35 0.38 0.48 0.68 0.47 0.80 Er 0.81 1.27 1.68 1.61 0.94 1.00 1.19 1.74 1.26 1.98 Tm 0.16 0.25 0.29 0.28 0.18 0.19 0.23 0.34 0.23 0.38 Yb 1.00 1.47 1.90 1.73 1.06 1.22 1.35 2.06 1.46 2.42 Lu 0.14 0.21 0.28 0.28 0.15 0.17 0.22 0.29 0.21 0.36 Eu/Eu* 0.83 0.55 0.54 0.42 0.69 0.59 0.60 0.58 0.56 0.55 Ce/Ce* 1.06 1.03 1.05 1.05 1.02 1.04 1.00 1.04 1.03 1.04 ∑REE 83.2 178.0 168.0 261.0 80.6 105.0 119.0 169.0 151.0 325.0 LREE/HREE 11.7 17.3 12.5 20.3 11.5 12.9 12.3 12.0 15.2 18.9 (La/Yb)N 13.0 21.3 14.2 27.2 12.6 14.2 15.1 13.4 18.0 23.2 (Eu/Eu*)UCC 1.27 0.84 0.83 0.65 1.06 0.91 0.92 0.90 0.86 0.83 (La/Yb)UCC 1.33 2.18 1.46 2.78 1.29 1.45 1.55 1.37 1.84 2.38 Li 4.45 3.24 5.00 4.56 17.9 4.05 4.62 53.1 5.12 7.11 Be 2.02 1.83 2.46 1.98 1.32 1.37 1.81 1.92 1.80 1.80 Sc 2.96 3.71 6.35 5.87 3.05 3.21 5.13 6.27 3.76 6.12 V 15.5 17.7 37.7 29.4 17.8 16.8 22.7 37.7 20.6 34.7 Cr 15.20 19.00 27.50 19.50 23.90 7.50 8.70 16.50 15.80 12.40 Co 2.18 3.89 5.90 4.22 3.63 3.37 2.98 5.55 3.63 4.49 Ni 4.91 6.60 7.48 5.66 6.42 4.26 3.95 6.73 5.14 5.65 Ga 15.6 21.0 22.7 27.9 13.6 15.3 17.5 23.0 21.0 32.4 Rb 90.5 113.0 106.0 96.8 70.1 72.5 82.5 103.0 100.0 91.3 Sr 176 140 196 147 178 177 184 225 143 179 Y 9.06 14.10 17.70 17.10 10.40 11.10 13.20 19.20 13.10 22.00 Ba 500 703 438 515 490 481 456 625 560 331 Pb 17.5 15.8 14.4 12.0 16.1 16.7 16.8 19.3 16.8 11.3 Th 4.75 9.89 10.80 15.20 4.68 5.47 7.39 11.10 9.04 18.40 U 1.07 2.31 1.98 1.94 1.18 1.03 1.56 2.15 1.31 2.62 Nb 5.22 7.62 9.55 9.60 5.04 6.03 6.18 10.50 6.70 12.70 Ta 0.36 0.58 0.61 0.77 0.37 0.40 0.48 0.71 0.48 1.30 Zr 46.4 54.9 87.8 69.7 39.0 43.2 54.6 92.3 56.7 121.0 Hf 1.45 1.87 2.74 2.34 1.33 1.37 1.83 2.86 1.79 3.81 Rb/Sr 0.51 0.81 0.54 0.66 0.39 0.41 0.45 0.46 0.70 0.51 Rb/Nb 17.30 14.80 11.10 10.10 13.90 12.00 13.30 9.81 14.90 7.19 注：主量元素单位为%，稀土、微量元素单位为10-6;F1=-1.773w(TiO2)+0.607w(Al2O3)+0.76w(Fe2O3)-1.5w(MgO)+0.616w(CaO)+0.509w(Na2O)-1.224w(K2O)-9.09;F2=-0.445w(TiO2)+0.07w(Al2O3)-0.25w(Fe2O3)-1.142w(MgO)+0.438w(CaO)+0.475w(Na2O)+1.426w(K2O)-6.861，据Roser,and Korsch(1988).
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