LA-ICP-MS Zircon U-Pb Age and Whole-Rock Geochemistry of the Triassic Intrusive Rocks in the Solon Obo Area, Inner Mongolia and Its Geological Significance
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摘要: 内蒙古索伦山地区朱恩道欧恩呼尔新识别出一套早中生代侵入岩，主要由角闪二长岩和二长闪长岩组成.通过LA-ICP-MS锆石U-Pb定年确定，角闪二长岩的结晶年龄为248±1 Ma(MSWD=1.1)，表明该岩体形成于早三叠世.它们的SiO2含量介于51.82%~60.17%之间，具有高镁(Mg#=53.17~59.03)、富碱(K2O+Na2O=7.36%~9.83%)、富钠(K2O/Na2O=0.25~0.53)特征，属于准铝质碱性岩.样品稀土总量变化范围为117.52×10-6~160.89×10-6，表现出一致的稀土元素和微量元素配分型式，即呈现出轻稀土元素相对于重稀土元素富集((La/Yb)N=9.57~15.42)的右倾曲线，且无明显Eu异常(δEu=0.76~1.00)，并富集Ba、Sr等大离子亲石元素，亏损Nb、Ta、Ti、Y等高场强元素，高Sr、低Y、高Sr/Y比值，具有高镁埃达克质闪长岩的地球化学特征.综合岩石地球化学特征及区域构造背景，朱恩道欧恩呼尔早中生代高镁埃达克质闪长岩类是由残余俯冲洋壳部分熔融形成的熔体与地幔橄榄岩相互作用而形成.朱恩道欧恩呼尔富碱侵入岩的形成与华北板块与西伯利亚板块碰撞后的伸展作用有关，这些新的年龄和岩石地球化学数据表明古亚洲洋闭合早于248 Ma.Abstract: The Early Mesozoic Zhuendaoouenhuer intrusion is located in Solon Obo area,Inner Mongolia. It mainly consists of hornblende monzonite and monzodiorite.LA-ICP-MS zircon U-Pb dating yields the Early-Triassic age of 248±1 Ma for the hornblende monzonite. Both the hornblende monzonite and monzodiorite are rich in silica (SiO2=51.82%-60.17%),MgO(Mg#=53.17-59.03),alkali (K2O+Na2O=7.36%-9.83%) and Na(K2O/Na2O=0.25-0.53),suggesting a typical alkaline series with the metaluminous feature (A/CNK=0.53-0.75).The rocks are poor in rare earth elements(ΣREE=117.52×10-6-160.89×10-6),enriched in LREE[(La/Yb)N=9.57-15.42] and LILEs (Ba、Sr),and depleted in HFSE,especially Nb,Ta,Ti,Y,and insignificant Eu anomalies(δEu=0.76-1.00),and had high Sr,low Y,high Sr/Y ratio,suggesting geochemical characteristics of high-Mg adakite diorite. The combination of geological setting and geochemical characteristics of the Zhuendaoouenhuer high-Mg adakitic rocks were most probably derived from partial melting of the remnant Paleo-Asian oceanicsubducted slabs and subsequently hybridized by mantle peridotite. The formation of the Zhuendaoouenhueradakitic intrusive rocks is related to the extension of the collision between the North China plate and the Siberian plate. These new age and rock geochemical data indicate that the ancient Asian Ocean closed earlier than 248 Ma.
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Key words:
- post collision /
- Early Ttriassic epoch /
- LA-ICP-MS /
- U-Pb dating /
- Solon Obo /
- geochemistry
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图 1 内蒙古乌拉特中旗朱恩道欧恩呼尔地区大地构造位置(a)及岩体分布(b)
Fig. 1. Simplified geology of the Zhuendaoouenhuer area in Urad Middle Banner, Inner Mongolia, showing distribution of the plutons
图 2 朱恩道欧恩呼尔岩体野外产状(a)与岩石学角闪二长岩显微特征(b)
Fig. 2. Field occurrence and micrograph of the Zhuendaoouenhuer intrusive rocks
图 3 朱恩道欧恩呼尔角闪二长岩样品(SL1-5)锆石阴极发光图像
Fig. 3. CL images of the zircons from the hornblende monzonite (SL1-5) of the Zhuendaoouenhuer intrusive rocks
图 4 朱恩道欧恩呼尔角闪二长岩锆石U-Pb年龄谐和图
Fig. 4. The U-Pb concordia diagram of the zircon analysis data of from the hornblende monzonite of the Zhuendaoouenhuer intrusive rocks
图 5 朱恩道欧恩呼尔侵入岩TAS图解、AR-SiO2和A/CNK-A/NK图解
底图据a. Middlemost(1994);b. Wright(1969);c. Maniar and Piccoli(1989);图a中横纵坐标单位为%；图b中纵坐标单位为%
Fig. 5. TAS, AR-SiO2 and A/CNK-A/NK diagrams of the Zhuendaoouenhuer intrusive rocks
图 6 朱恩道欧恩呼尔侵入岩球粒陨石标准化稀土元素配分曲线(a)和原始地幔标准化微量元素蛛网图(b)
Fig. 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns of the Zhuendaoouenhuer intrusive rocks
图 7 朱恩道欧恩呼尔侵入岩Sr/Y-Y图解
Fig. 7. Sr/Y-Y diagrams of the Zhuendaoouenhuer intrusive rocks
图 8 朱恩道欧恩呼尔侵入岩源区判别图解
CC.大陆地壳；PM.原始地幔；OIB.洋岛玄武岩；MORB.洋中脊玄武岩; 底图据Jahn et al.(1999)(b)和汤艳杰等(2014)(a)
Fig. 8. Source discrimination diagrams of the Zhuendaoouenhuer intrusive rocks
表 1 朱恩道欧恩呼尔角闪二长岩(SL1-5)LA-ICP-MS锆石U-Pb定年分析结果
Table 1. LA-ICP-MS U-Pb age data of zircons separated from the hornblende monzonite (SL1-5) of the Zhuendaoouenhuer intrusive rocks
分析点 含量(10-6) Th/U 同位素比值 年龄(Ma) Th U $\frac{{^{207}{\rm{Pb}}/}}{{^{206}{\rm{Pb}}}} $ 1σ $\frac{{^{207}{\rm{Pb}}/}}{{^{235}{\rm{U}}}} $ 1σ $\frac{{^{206}{\rm{Pb}}/}}{{^{238}{\rm{U}}}} $ 1σ rho $\frac{{^{207}{\rm{Pb}}/}}{{^{206}{\rm{Pb}}}} $ 1σ $\frac{{^{207}{\rm{Pb}}/}}{{^{235}{\rm{U}}}} $ 1σ $\frac{{^{206}{\rm{Pb}}/}}{{^{238}{\rm{U}}}} $ 1σ 1 526 465 1.13 0.051 4 0.001 7 0.276 0.009 0.038 9 0.000 5 0.380 1 261 51 247 7 246 3 2 428 400 1.07 0.051 4 0.002 2 0.274 0.011 0.038 6 0.000 6 0.350 1 260 68 246 9 244 3 3 592 549 1.08 0.050 5 0.001 5 0.272 0.008 0.039 0 0.000 5 0.402 0 219 45 244 6 247 3 4 178 254 0.70 0.052 2 0.002 6 0.280 0.014 0.038 9 0.000 6 0.318 5 293 82 251 11 246 4 5 204 230 0.89 0.051 2 0.002 6 0.284 0.014 0.040 2 0.000 6 0.310 4 251 85 254 11 254 4 6 798 736 1.08 0.050 7 0.001 3 0.266 0.007 0.038 1 0.000 4 0.432 4 228 38 240 5 241 3 7 515 464 1.11 0.050 2 0.001 9 0.256 0.009 0.036 9 0.000 5 0.357 3 205 59 231 7 234 3 8 664 636 1.04 0.052 3 0.001 5 0.266 0.007 0.037 0 0.000 4 0.424 4 297 40 240 6 234 3 9 572 540 1.06 0.052 8 0.001 6 0.267 0.008 0.036 7 0.000 4 0.399 9 318 44 240 6 232 3 10 379 373 1.01 0.054 0 0.002 0 0.273 0.010 0.036 7 0.000 5 0.356 8 369 58 245 8 232 3 11 429 432 0.99 0.052 1 0.001 8 0.278 0.009 0.038 7 0.000 5 0.373 8 289 53 249 7 245 3 12 830 721 1.15 0.053 1 0.002 0 0.273 0.010 0.037 3 0.000 5 0.391 5 333 54 245 8 236 3 13 494 517 0.96 0.052 5 0.001 6 0.278 0.008 0.038 5 0.000 5 0.390 3 309 47 249 7 243 3 14 523 493 1.06 0.049 7 0.001 6 0.274 0.008 0.040 0 0.000 5 0.374 6 183 50 246 7 253 3 15 297 304 0.98 0.050 6 0.002 4 0.273 0.013 0.039 1 0.000 6 0.329 7 222 78 245 10 247 4 16 710 565 1.26 0.051 6 0.001 6 0.282 0.008 0.039 5 0.000 5 0.403 2 270 46 252 7 250 3 17 475 478 0.99 0.049 6 0.001 6 0.267 0.008 0.039 0 0.000 5 0.392 3 178 49 240 7 247 3 18 437 409 1.07 0.050 9 0.001 7 0.277 0.009 0.0394 0.000 5 0.370 7 234 53 248 7 249 3 19 589 545 1.08 0.053 2 0.001 6 0.292 0.008 0.039 8 0.000 5 0.411 3 339 43 260 6 251 3 20 762 632 1.21 0.049 9 0.001 3 0.260 0.007 0.037 8 0.000 4 0.432 4 188 38 234 5 239 3 21 353 389 0.91 0.048 3 0.001 7 0.260 0.009 0.039 0 0.000 5 0.364 0 114 55 234 7 247 3 22 552 541 1.02 0.049 4 0.001 4 0.268 0.007 0.039 3 0.000 4 0.410 5 166 43 241 6 248 3 23 467 771 0.61 0.050 6 0.001 1 0.275 0.006 0.039 5 0.000 4 0.489 3 221 29 247 5 250 2 24 1063 838 1.27 0.050 8 0.001 1 0.274 0.006 0.039 1 0.000 4 0.492 7 229 29 246 4 247 2 25 685 582 1.18 0.050 0 0.001 3 0.259 0.007 0.037 5 0.000 4 0.426 6 193 38 233 5 237 2 
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表 2 朱恩道欧恩呼尔早三叠世侵入岩主量元素(%)分析结果
Table 2. Whole rock major element compositions of the Zhuendaoouenhuer intrusive rocks
样号 WL1836-1 WL1836-2 WL1836-3 WL1836-4 WL1837 WL1837-1 WL1837-2 岩性 二长闪长岩 二长闪长岩 角闪二长岩 角闪二长岩 角闪二长岩 角闪二长岩 角闪二长岩 SiO2 51.82 54.46 56.74 56.03 55.35 57.01 60.17 Al2O3 13.22 13.23 12.42 12.70 12.89 12.73 13.62 Fe2O3 8.55 8.02 7.33 8.07 7.58 6.87 6.60 CaO 6.25 7.43 4.27 6.08 5.90 5.14 1.71 MgO 5.87 4.90 5.28 5.01 5.18 3.90 4.16 K2O 1.66 2.03 2.17 2.15 2.88 3.16 2.14 Na2O 6.61 5.50 6.01 5.21 6.08 5.99 7.69 MnO 0.14 0.12 0.11 0.12 0.11 0.10 0.09 TiO2 1.41 1.29 1.04 1.31 1.25 1.11 0.86 P2O5 0.52 0.50 0.39 0.49 0.45 0.47 0.33 烧失量(%) 2.61 1.02 2.62 2.01 2.01 2.41 2.61 Mg# 57.86 54.99 59.03 55.39 57.75 53.17 55.76
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表 3 朱恩道欧恩呼尔早三叠世侵入岩微量元素(10-6)分析结果
Table 3. Whole rock trace element compositions of the Zhuendaoouenhuer intrusive rocks
样号 WL1836-1 WL1836-2 WL1836-3 WL1836-4 WL1837 WL1837-1 WL1837-2 岩性 二长闪长岩 二长闪长岩 角闪二长岩 角闪二长岩 角闪二长岩 角闪二长岩 角闪二长岩 Li 29.34 24.28 39.10 30.34 22.90 27.00 31.00 Sc 7.16 7.16 7.16 7.16 7.16 7.16 7.16 V 117.32 123.34 109.40 125.82 119.06 106.50 101.94 Cr 102.48 122.34 141.18 119.42 119.00 81.28 113.68 Co 16.71 15.66 13.59 17.17 15.20 11.94 16.55 Ni 25.74 19.87 35.48 23.04 20.70 12.30 54.78 Cu 18.95 19.64 22.30 21.04 18.43 12.92 37.18 Zn 96.02 80.96 78.68 89.56 79.12 76.18 77.56 Ga 20.14 20.74 17.73 19.74 19.11 20.04 19.68 Rb 30.96 35.20 38.04 31.38 54.34 44.88 39.76 Sr 1 598.40 1 267.20 1 154.00 1 699.80 1 039.00 1 607.00 1 545.40 Y 19.37 19.11 16.05 18.02 20.14 16.38 11.16 Zr 173.02 198.62 124.42 132.04 161.86 218.80 123.32 Nb 10.60 10.12 7.76 9.86 10.03 10.31 7.35 Cs 1.62 1.40 1.46 1.59 0.92 0.89 1.70 Ba 1 274.20 526.80 619.40 1 326.40 557.40 655.80 1 476.40 La 25.92 25.54 23.36 26.00 30.16 33.76 25.02 Ce 57.30 56.82 49.42 55.72 64.56 69.24 50.34 Pr 6.98 6.80 5.75 6.68 7.44 7.80 5.62 Nd 28.70 27.94 22.96 27.62 29.74 29.88 21.66 Sm 5.63 5.47 4.54 5.41 5.69 5.15 3.86 Eu 1.69 1.53 1.18 1.65 1.43 1.34 1.25 Gd 5.41 5.35 4.47 5.27 5.65 5.04 3.64 Tb 0.73 0.70 0.59 0.69 0.74 0.62 0.45 Dy 4.04 4.01 3.39 3.88 4.17 3.34 2.39 Ho 0.73 0.73 0.61 0.71 0.77 0.62 0.44 Er 2.15 2.17 1.84 2.07 2.28 1.90 1.34 Tm 0.29 0.29 0.24 0.27 0.30 0.25 0.18 Yb 1.94 1.88 1.63 1.78 2.03 1.70 1.16 Lu 0.27 0.27 0.24 0.26 0.29 0.25 0.17 Hf 4.03 4.82 3.34 3.16 4.09 5.31 3.30 Ta 0.70 0.69 0.54 0.59 0.72 0.69 0.47 Pb 12.58 12.78 13.56 12.52 13.75 16.31 15.58 Bi 0.19 0.13 0.18 0.11 0.13 0.18 0.20 Th 5.02 6.58 8.06 4.41 9.35 10.78 7.12 U 1.46 1.61 1.18 1.13 2.26 2.67 1.38 ΣREE 141.78 139.49 120.24 138.00 155.25 160.89 117.52 (La/Yb)N 9.57 9.73 10.27 10.47 10.65 14.24 15.42 δEu 0.92 0.85 0.79 0.93 0.76 0.80 1.00 δCe 1.02 1.04 1.01 1.01 1.03 1.01 1.00 注:球粒陨石标准值据Sun and McDonough(1989).
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