Geochronology, Geochemistry and Geological Significance of Early Paleozoic Wulanaobaotu Intrusive Rocks, Inner Mongolia
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摘要: 对造山带中岩浆作用的研究可以为构造演化提供约束.兴蒙造山带中段乌兰敖包图一带出露一套早古生代早期的闪长质侵入岩(石英闪长岩和闪长岩)，具有俯冲带型侵入岩的岩石组合和地球化学特征，标志着早古生代古亚洲洋的俯冲事件.通过锆石LA-MC-ICPMS U-Pb定年，在石英闪长岩和闪长岩中分别获得了474.0±1.8 Ma和487.8 ±1.9 Ma的年龄，属于晚寒武世－早奥陶世.锆石原位Hf同位素分析表明，乌兰敖包图侵入岩具有富集的Hf同位素组成，176Hf/177Hf范围为0.282 123~0.282 304，εHf(t)均为负值(两件样品的平均值分别为－10.84和－8.53)，二阶段模式年龄为古元古代(范围为1 851~2 250 Ma)，表明这套侵入岩源于古元古代中期再循环地壳物质.岩石地球化学分析显示，石英闪长岩和闪长岩具有中等SiO2含量(56.52%~66.06%)，较高的Na2O(2.60%~6.81%)、Al2O3(14.69%~18.35%)、CaO(0.57%~6.58%，平均值为3.97%)含量，低的K2O(0.73%~2.94%)、TFeO、MgO含量，Na2O/K2O比值较高(0.92~5.66，平均值为3.19)；微量元素具有Rb、Ba、Th、U、Sr、K等大离子亲石元素的富集以及Nb、Ta、P、Ti等高场强元素的亏损；稀土总量较低，轻稀土富集，具有较弱的Eu负异常(δEu范围为0.76~0.99).地球化学特征以及锆石Hf同位素组成表明，乌兰敖包图早古生代侵入岩在主动大陆边缘的构造背景之下，由古老地壳物质熔融形成的，代表了兴蒙造山带中段早古生代早期的俯冲事件，将兴蒙造山带中段早古生代北部岩浆岩带向东延伸，并且佐证了锡林浩特地区存在前寒武纪基底.Abstract: The study of magmatism can reveal the orogenic tectonic evolution. In this paper, zircon LA-MC-ICPMS U-Pb dating, Hf isotopic compositions and whole rock geochemical data of the Early Paleozoic dioritic rocks from Wulanaobaotu region, central part of the Xing-Meng Orogenic belt are present. The rock suite consists of two major rock types, i.e., quartz-diorite and diorite, with zircon U-Pb ages of 474.0±1.8 Ma and 487.8±1.9 Ma, respectively. In-situ zircon Hf isotopic analysis shows enriched compositions with 176Hf/177Hf ratios varying from 0.282 123 to 0.282 304, negative εHf(t) values and Hf two stage model ages(TDMC) from 1 851 to 2 250 Ma. The results indicate that the intrusive rocks are likely derived from an ancient basement material. Geochemically, these rocks show moderate SiO2 contents (56.52%-66.06%), high and variable Na2O (2.60%-6.81%), Al2O3 (14.69%-18.35%), and CaO (0.57%-6.58%, average 3.97%) contents, but low K2O (0.73%-2.94%), TFeO and MgO contents. Most Na2O/K2O ratios are all higher (0.92-5.66, average 3.19). The trace elemental data of these rocks display enrichment of Rb, Ba, Th, U, K and Sr, but depletion of Nb, Ta, P and Ti. The total REE contents are low with moderate fractionation between LREE and HREE. Meanwhile, weakly negative Eu anormalyies (δEu ranges from 0.76 to 0.99) are observed in all samples. Thus, we propose that the Wulanaobaotu dioritic intrusive rocks were likely formed in an active continental margin setting during Late Cambrian to Early Ordovician, consistent with the existence of Early Paleozoic subduction-related tectonic-magmatic belt in Xing-Meng orogenic belt. The enriched zircon Hf isotopic characteristics further northern suggest the magma originated from a Precambrian basement source.
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Key words:
- Early Paleozoic /
- intrusive rock /
- subduction /
- active continental margin /
- Precambrian basement /
- isotope /
- geochemistry
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图 1 研究区地质简图
图a据喇嘛音乌苏地质图(中国地质调查局实物地质资料中心.2013.1: 50 000喇嘛音乌苏等4幅区调报告)修改；图b据Xiao et al.(2003)
Fig. 1. Geological sketch of study area
图 2 样品野外及镜下照片
a, b.石英闪长岩；c, d.闪长岩；Hbl.角闪石；Qtz.石英；Pl.斜长石
Fig. 2. Field and Microscope photographs of samples
图 3 锆石阴极发光及LA-MC-ICPMS测年、Hf同位素分析点位
实心圆圈为测年，虚线圈为Hf同位素分析
Fig. 3. Cathodoluminescence images and analysis spot of zircons
图 4 内蒙古乌兰敖包图闪长质侵入岩锆石LA-MC-ICPMS U-Pb测年谐和图
Fig. 4. Concordia diagrams for LA-MC-ICPMS zircon U-Pb dating of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia
图 5 内蒙古乌兰敖包图闪长质侵入岩SiO2-K2O图解
Fig. 5. SiO2-K2O diagram of Wulanaobaotu dioritic intrusive rocks
图 6 内蒙古乌兰敖包图闪长质侵入岩A/CNK-A/NK图解
据Maniar and Piccoli(1989)
Fig. 6. A/CNK-A/NK diagram of Wulanaobaotu dioritic intrusive rocks
图 7 内蒙古乌兰敖包图闪长质侵入岩原始地幔标准化微量元素蛛网图
原始地幔标准化数据根据Sun and McDonough(1989)
Fig. 7. Primitive mantle-normalized trace elements spider diagram of Wulanaobaotu dioritic intrusive rocks
图 8 内蒙古乌兰敖包图闪长质侵入岩稀土配分模式图
原始地幔标准化数据根据Sun and McDonough(1989)
Fig. 8. Chondrite-normalized REE patterns diagram of Wulanaobaotu dioritic intrusive rocks
图 9 内蒙古乌兰敖包图闪长质侵入岩的Y-Nb及Y+Nb-Rb构造环境判别图解
Fig. 9. Y-Nb and Y+Nb-Rb discrimination diagrams of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia
图 10 内蒙古乌兰敖包图闪长质侵入岩的Th/Yb-Ta/Yb判别图解
OCEANIC ARCS.大洋岛弧；ACM.主动大陆边缘；WPVZ.陆内火山岩带；MORB.洋中脊玄武岩；WPB.板内玄武岩；据Gorton and Schandl(2000)
Fig. 10. Th/Yb-Ta/Yb discrimination diagrams of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia
图 11 内蒙古乌兰敖包图闪长质侵入岩εHf(t)-t图解
兴蒙造山带东段Hf同位素组成据Yang et al.(2006)
Fig. 11. εHf(t)-t diagrams of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia
表 1 内蒙古乌兰敖包图闪长质侵入岩锆石U-Pb测年分析结果
Table 1. Zircon LA-MC-ICPMS U-Pb dating data of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia
点号 含量(10-6) Th/U 同位素比值 年龄(Ma) Pb U Th 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206U 1σ 石英闪长岩(14XL02.1) 1 10 138 45 0.326 1 0.076 0 0.000 7 0.594 2 0.012 7 0.056 7 0.001 2 472 5 474 10 480 45 2 18 229 88 0.386 0 0.076 0 0.000 7 0.598 3 0.009 8 0.057 1 0.000 9 472 5 476 8 495 34 3 16 207 72 0.350 0 0.076 1 0.000 7 0.602 2 0.011 1 0.057 4 0.001 0 473 5 479 9 507 38 4 12 158 48 0.305 6 0.076 1 0.000 7 0.598 7 0.012 4 0.057 0 0.001 1 473 5 476 10 493 43 5 27 340 138 0.404 3 0.076 2 0.000 7 0.593 2 0.009 1 0.056 5 0.000 8 473 5 473 7 471 31 6 10 127 40 0.316 8 0.076 3 0.000 7 0.598 4 0.014 1 0.056 9 0.001 3 474 5 476 11 488 50 7 26 326 118 0.363 1 0.076 0 0.000 7 0.594 2 0.008 7 0.056 7 0.000 7 472 5 474 7 481 29 8 12 156 47 0.299 3 0.076 1 0.000 7 0.591 9 0.010 9 0.056 4 0.001 0 473 5 472 9 470 38 9 18 232 65 0.279 7 0.076 6 0.000 7 0.596 2 0.016 4 0.056 5 0.001 5 476 5 475 13 471 57 10 18 219 72 0.329 2 0.077 3 0.000 7 0.597 2 0.011 0 0.0560 0.001 0 480 5 475 9 453 38 11 11 134 35 0.258 1 0.076 9 0.000 8 0.598 2 0.018 5 0.056 4 0.001 7 478 5 476 15 469 66 12 11 135 39 0.288 5 0.077 1 0.000 8 0.594 3 0.014 7 0.055 9 0.001 3 479 5 474 12 447 52 13 11 140 43 0.307 4 0.076 8 0.000 7 0.595 7 0.016 3 0.056 2 0.001 5 477 5 474 13 462 58 14 18 230 90 0.394 0 0.076 3 0.000 7 0.596 9 0.011 7 0.056 7 0.001 0 474 5 475 9 480 41 15 9 117 35 0.301 7 0.076 5 0.000 8 0.599 9 0.019 9 0.056 9 0.001 8 475 5 477 16 488 71 16 19 240 97 0.402 0 0.076 4 0.000 7 0.595 8 0.009 7 0.056 6 0.000 9 474 5 475 8 476 33 17 10 131 50 0.383 6 0.076 1 0.000 7 0.600 4 0.017 0 0.057 2 0.001 6 473 5 477 14 500 60 18 8 98 31 0.316 3 0.076 0 0.000 8 0.592 4 0.023 4 0.056 5 0.002 2 472 5 472 19 472 84 19 8 108 44 0.405 7 0.076 7 0.000 8 0.598 9 0.021 0 0.056 7 0.001 9 476 5 477 17 479 75 20 16 200 93 0.464 1 0.076 2 0.000 7 0.598 2 0.020 4 0.057 0 0.001 9 473 5 476 16 490 73 21 11 142 58 0.408 0 0.075 8 0.000 7 0.593 1 0.015 2 0.056 8 0.001 4 471 5 473 12 483 55 22 10 128 45 0.353 5 0.075 8 0.000 7 0.593 6 0.013 3 0.056 8 0.001 2 471 5 473 11 484 47 23 9 112 35 0.313 9 0.076 0 0.000 7 0.595 9 0.018 4 0.056 9 0.001 7 472 5 475 15 487 66 24 12 149 57 0.379 4 0.076 1 0.000 7 0.595 9 0.013 2 0.056 8 0.001 2 473 5 475 10 484 46 闪长岩(14XL03.1) 1 24 292 109 0.371 4 0.078 6 0.000 8 0.621 3 0.009 4 0.0573 0.000 8 488 5 491 7 504 30 2 26 310 118 0.380 0 0.078 6 0.000 8 0.628 6 0.009 7 0.0580 0.000 8 488 5 495 8 530 31 3 18 221 89 0.401 6 0.078 0 0.000 8 0.616 9 0.010 6 0.0573 0.000 9 484 5 488 8 505 35 4 32 380 135 0.354 1 0.079 1 0.000 8 0.625 0 0.011 6 0.0573 0.001 0 491 5 493 9 502 37 5 36 439 157 0.357 3 0.078 5 0.000 8 0.615 3 0.009 1 0.0568 0.000 8 487 5 487 7 485 30 6 24 302 113 0.373 1 0.078 5 0.000 8 0.617 4 0.010 1 0.0570 0.000 9 487 5 488 8 493 33 7 27 333 127 0.380 7 0.078 5 0.000 8 0.617 0 0.009 0 0.0570 0.000 7 487 5 488 7 492 29 8 22 271 98 0.360 9 0.078 4 0.000 8 0.616 0 0.010 1 0.0570 0.000 9 487 5 487 8 490 34 9 25 305 143 0.467 6 0.078 0 0.000 8 0.619 7 0.009 7 0.0576 0.000 8 484 5 490 8 515 31 10 16 197 76 0.384 5 0.078 8 0.000 8 0.619 9 0.013 8 0.0570 0.001 2 489 5 490 11 493 46 11 28 342 189 0.553 1 0.078 7 0.000 8 0.619 9 0.009 9 0.0571 0.000 8 488 5 490 8 497 32 12 33 406 192 0.473 3 0.078 5 0.000 8 0.618 8 0.009 1 0.0572 0.000 8 487 5 489 7 499 30 13 10 131 40 0.308 5 0.078 5 0.000 8 0.633 1 0.015 6 0.0585 0.001 4 487 5 498 12 547 52 14 18 228 93 0.408 6 0.078 5 0.000 8 0.627 6 0.010 6 0.0580 0.000 9 487 5 495 8 530 34 15 22 271 111 0.409 6 0.078 7 0.000 8 0.626 6 0.009 7 0.0578 0.000 8 488 5 494 8 521 31 16 33 396 176 0.444 2 0.079 0 0.000 8 0.636 3 0.009 3 0.0584 0.000 8 490 5 500 7 545 28 17 30 367 152 0.415 3 0.078 4 0.000 8 0.630 2 0.009 3 0.0583 0.000 8 486 5 496 7 542 29 18 32 395 162 0.410 3 0.078 6 0.000 8 0.622 6 0.008 9 0.0574 0.000 7 488 5 491 7 509 28 19 32 393 154 0.391 5 0.078 7 0.000 8 0.633 0 0.009 2 0.0583 0.000 8 488 5 498 7 542 29 20 38 467 187 0.399 3 0.078 7 0.000 8 0.638 1 0.008 9 0.0588 0.000 7 488 5 501 7 561 27 21 28 348 144 0.413 3 0.079 2 0.000 8 0.642 2 0.010 7 0.0588 0.000 9 491 5 504 8 561 34 22 21 264 90 0.340 8 0.078 8 0.000 8 0.630 2 0.010 7 0.0580 0.000 9 489 5 496 8 530 35 23 27 339 136 0.401 9 0.078 9 0.000 8 0.632 0 0.010 2 0.0581 0.000 8 490 5 497 8 532 32 24 39 484 205 0.424 1 0.078 6 0.000 8 0.621 2 0.008 6 0.0573 0.000 7 488 5 491 7 505 27 
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表 2 内蒙古乌兰敖包图闪长质侵入岩锆石Hf同位素组成
Table 2. Hf isotopic compositions for zircons of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia by LA-MC-ICPMS
点号 t(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(0) εHf(t) 2σ TDM(Ma) TDMC(Ma) fLu/Hf 石英闪长岩(14XL02.1) 2 474 0.023 642 0.000 907 0.282 160 0.000 018 0.282 152 -21.64 -11.51 0.65 1 536 2 169 -0.97 3 474 0.020 162 0.000 784 0.282 207 0.000 018 0.282 200 -19.98 -9.81 0.62 1 467 2 063 -0.98 7 474 0.033 324 0.001 286 0.282 226 0.000 022 0.282 215 -19.30 -9.28 0.77 1 459 2 029 -0.96 10 474 0.023 852 0.000 928 0.282 125 0.000 016 0.282 117 -22.88 -12.76 0.55 1 586 2 247 -0.97 11 474 0.022 722 0.000 847 0.282 197 0.000 017 0.282 190 -20.32 -10.17 0.61 1 482 2 085 -0.97 12 474 0.027 976 0.001 065 0.282 123 0.000 015 0.282 113 -22.96 -12.88 0.54 1 595 2 255 -0.97 16 474 0.019 539 0.000 761 0.282 257 0.000 017 0.282 250 -18.22 -8.04 0.60 1 396 1 951 -0.98 17 474 0.017 884 0.000 725 0.282 147 0.000 018 0.282 141 -22.10 -11.92 0.64 1 547 2 194 -0.98 18 474 0.020 503 0.000 835 0.282 160 0.000 016 0.282 152 -21.65 -11.50 0.56 1 534 2 168 -0.97 19 474 0.019 483 0.000 749 0.282 152 0.000 021 0.282 145 -21.92 -11.74 0.73 1 541 2 184 -0.98 20 474 0.025 841 0.001 047 0.282 143 0.000 019 0.282 134 -22.24 -12.16 0.66 1 566 2 210 -0.97 23 474 0.022 979 0.000 917 0.282 237 0.000 017 0.282 229 -18.92 -8.79 0.60 1 430 1 998 -0.97 24 474 0.015 688 0.000 608 0.282 210 0.000 016 0.282 204 -19.88 -9.66 0.57 1 456 2 053 -0.98 闪长岩(14XL03.1) 2 484 0.022 977 0.000 910 0.282 224 0.000 017 0.282 215 -19.39 -9.04 0.58 1 448 2 022 -0.97 4 484 0.033 733 0.001 277 0.282 253 0.000 019 0.282 242 -18.34 -8.11 0.68 1 421 1 963 -0.96 6 484 0.035 415 0.001 332 0.282 240 0.000 024 0.282 228 -18.80 -8.59 0.83 1 441 1 993 -0.96 7 484 0.027 639 0.001 099 0.282 272 0.000 020 0.282 262 -17.68 -7.40 0.69 1 388 1 918 -0.97 8 484 0.033 706 0.001 358 0.282 228 0.000 020 0.282 216 -19.23 -9.03 0.70 1 459 2 021 -0.96 9 484 0.032 520 0.001 328 0.282 183 0.000 022 0.282 171 -20.83 -10.62 0.75 1 521 2 120 -0.96 11 484 0.033 275 0.001 421 0.282 231 0.000 018 0.282 218 -19.13 -8.95 0.63 1 458 2 016 -0.96 14 484 0.027 115 0.001 084 0.282 302 0.000 017 0.282 292 -16.63 -6.34 0.59 1 346 1 852 -0.97 18 484 0.039 999 0.001 534 0.282 255 0.000 019 0.282 241 -18.30 -8.15 0.66 1 429 1 966 -0.95 19 484 0.040 566 0.001 596 0.282 193 0.000 021 0.282 178 -20.48 -10.36 0.75 1 519 2 104 -0.95 20 484 0.033 335 0.001 290 0.282 235 0.000 019 0.282 224 -18.98 -8.76 0.65 1 447 2 004 -0.96 22 484 0.034 361 0.001 301 0.282 304 0.000 023 0.282 292 -16.55 -6.33 0.81 1 350 1 851 -0.96 23 484 0.033 929 0.001 261 0.282 202 0.000 023 0.282 191 -20.14 -9.91 0.81 1 492 2 076 -0.96 24 484 0.031 695 0.001 288 0.282 235 0.000 023 0.282 224 -18.98 -8.76 0.80 1 446 2 004 -0.96 注：εHf(0)=[176Hf/177Hf)s/(176Hf/177Hf)CHUR, 0 -1]×10 000；εHf(t)={[(176Hf/177Hf)s-(176Lu/177Hf)s×(eλt-1)]/[176Hf/177HfCHUR, 0-(176Lu/177Hf)s×(eλt-1)]-1}×10 000；TDM=1/λ×ln{1+[(176Hf/177Hf)s-(176Hf/177Hf)DM]/[(176Lu/177Hf)s-(176Lu/177Hf)DM]；TDMC=TDM-(TDM-t)×[(fcc-fs)/(fcc-fDM)]；fs=(176Lu/177Hf)s/[(176Lu/177Hf)CHUR-1；其中(176Lu/177Hf)s和176Hf/177Hfs为样品测定值，(176Lu/177Hf)CHUR=0.033 2，(176Hf/177Hf)CHUR, 0=0.0282 772；(176Lu/177Hf)DM=0.038 4，(176Hf/177Hf)DM=0.283 25.fcc，fs，fDM分别为大陆平均地壳、样品和亏损地幔的fLu/Hf，fcc=-0.55，fDM=0.16.t为样品形成时间，λ=1.867×10-11a-1.
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表 3 内蒙乌兰敖包图闪长质侵入岩主量元素(%)和微量元素(10-6)分析结果
Table 3. Major(%) and trace elements(10-6) data of Wulanaobaotu dioritic intrusive rocks, Inner Mongolia
样品号 石英闪长岩 闪长岩 14XL01-1 14XL02-1 14XL02-2 14XL02-3 14XL03-2 14XL03-1 14XL03-3 14XL04-1 14XL04-3 14XL04-4 SiO2 64.20 61.91 61.22 66.06 64.02 58.28 59.58 58.71 56.52 56.78 Al2O3 16.66 16.76 16.84 15.08 14.71 16.64 14.69 17.84 18.16 18.35 Fe2O3 2.40 2.83 4.16 2.24 1.70 1.90 2.04 1.78 2.52 2.74 FeO 2.69 3.57 2.11 3.04 3.75 5.27 5.05 4.16 4.71 4.09 TFeO 4.85 6.12 5.85 5.06 5.28 6.98 6.89 5.76 6.98 6.56 TFe2O3 5.39 6.80 6.50 5.62 5.87 7.76 7.65 6.40 7.75 7.29 CaO 0.57 3.08 6.58 2.90 5.03 4.32 5.77 3.30 3.94 4.25 MgO 2.18 2.54 1.53 1.98 2.55 3.84 4.51 2.76 3.38 2.94 K2O 1.50 1.22 1.11 0.88 1.11 2.84 0.73 1.97 2.94 1.86 Na2O 6.81 4.56 3.66 4.98 3.20 2.60 3.17 5.36 3.65 4.69 TiO2 0.50 0.48 0.38 0.42 0.53 0.69 0.65 0.57 0.72 0.65 P2O5 0.16 0.15 0.13 0.10 0.13 0.15 0.15 0.25 0.28 0.27 MnO 0.10 0.12 0.11 0.10 0.10 0.15 0.13 0.15 0.19 0.16 LOI 1.94 2.38 1.92 1.88 2.75 2.74 2.95 2.70 2.47 2.75 总量 99.71 99.60 99.75 99.66 99.58 99.42 99.42 99.55 99.48 99.53 Na2O/K2O 4.54 3.74 3.30 5.66 2.88 0.92 4.34 2.72 1.24 2.52 A/CNK 1.20 1.16 0.88 1.05 0.94 1.09 0.89 1.05 1.11 1.05 Cs 1.17 1.20 0.87 0.76 1.20 2.69 1.30 1.27 2.53 1.92 Rb 26.9 25.6 16.7 13.9 29.2 80.4 19.0 44.0 77.4 52.0 Ba 436 321 306 296 667 1 440 283 862 852 456 Sr 147.0 408.0 532.0 228.0 240.0 285.0 98.5 217.0 452.0 427.0 Li 9.78 15.90 6.75 7.48 15.90 19.40 19.10 14.40 15.80 13.80 Ga 14.6 16.1 18.6 11.6 13.9 15.0 13.9 16.0 17.4 17.3 Nb 8.84 7.50 6.01 7.34 5.86 7.41 6.00 6.41 8.26 7.35 Ta 0.69 0.52 0.46 0.52 0.36 0.50 0.40 0.39 0.64 0.49 Zr 125.0 130.0 94.0 99.5 128.0 97.8 116.0 64.9 82.9 120.0 Hf 4.03 4.09 3.01 3.08 3.57 3.02 3.36 2.14 2.68 3.59 U 0.93 1.50 2.18 1.64 0.94 1.29 0.86 1.31 1.72 1.75 Th 4.71 5.10 7.90 7.10 2.64 13.90 4.62 11.60 18.00 8.28 Cu 5.92 43.70 7.21 5.16 25.00 20.30 57.00 12.50 28.10 10.40 Pb 3.21 6.50 10.30 2.34 6.18 4.31 4.75 6.50 5.04 5.49 Zn 54.6 40.5 32.3 33.0 53.7 77.8 68.5 58.8 62.0 61.8 Cr 4.52 3.77 3.99 18.80 23.60 19.60 84.30 5.07 7.80 8.79 Ni 3.74 4.85 5.73 5.43 7.98 5.18 15.40 6.42 8.14 8.52 Co 8.01 9.95 8.57 10.40 14.10 18.30 22.80 14.50 19.20 16.50 V 85.0 96.4 106.0 112.0 152.0 200.0 194.0 153.0 219.0 165.0 Sc 12.80 8.44 9.55 11.00 20.60 29.50 31.60 15.30 23.20 16.80 La 12.90 15.30 23.00 14.80 9.78 38.80 14.00 18.00 28.00 13.20 Ce 31.7 33.8 57.3 39.6 24.3 71.1 36.5 39.3 62.2 30.4 Pr 3.12 4.18 5.63 3.43 2.98 7.28 4.28 5.14 7.94 4.59 Nd 11.6 16.3 21.1 12.7 12.7 26.1 17.9 20.6 31.2 20.3 Sm 2.08 3.42 3.86 2.60 3.16 4.68 3.84 4.26 6.04 4.77 Eu 0.52 0.94 1.01 0.74 0.96 1.45 0.99 1.30 1.64 1.30 Gd 2.09 3.24 4.05 2.56 3.55 5.05 4.01 3.75 5.38 3.92 Tb 0.29 0.55 0.59 0.42 0.52 0.70 0.59 0.56 0.78 0.62 Dy 1.51 3.31 3.39 2.42 3.16 3.94 3.51 3.12 3.98 3.51 Ho 0.28 0.67 0.70 0.50 0.63 0.81 0.71 0.62 0.80 0.72 Er 0.83 2.01 2.07 1.46 1.84 2.43 1.95 1.72 2.36 2.05 Tm 0.13 0.31 0.32 0.22 0.28 0.36 0.31 0.28 0.36 0.31 Yb 0.86 2.12 2.17 1.53 1.82 2.41 2.11 1.89 2.44 2.12 Lu 0.14 0.36 0.36 0.25 0.30 0.40 0.35 0.31 0.42 0.35 Y 6.65 17.40 18.80 12.60 16.20 20.60 18.20 16.20 20.70 17.80 ΣREE 68.05 86.51 125.55 83.23 65.98 165.51 91.05 100.85 153.54 88.16 δEu 0.76 0.86 0.78 0.88 0.88 0.91 0.77 0.99 0.88 0.92 (La/Yb)N 10.76 5.18 7.60 6.94 3.85 11.55 4.76 6.83 8.23 4.47 (La/Sm)N 4.00 2.89 3.85 3.67 2.00 5.35 2.35 2.73 2.99 1.79 (Gd/Yb)N 2.01 1.26 1.54 1.38 1.61 1.73 1.57 1.64 1.82 1.53 注：测试工作由天津地质矿产研究所实验室完成，主量元素采用熔片法XRF测试，其中FeO采用氢氟酸、硫酸溶样、重铬酸钾滴定容量法，微量元素采用ICP-MS测试.N代表球粒陨石标准化，$ \delta {\rm{Eu}} = \sqrt {{\rm{S}}{{\rm{m}}_{\rm{N}}} \times {\rm{G}}{{\rm{d}}_{\rm{N}}}} $，标准化数据引自Sun and McDonough(1989).
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