LA-ICP-MS zircon U-Pb age of A-type granite from the Shibanjing area of middle Beishan orogenic belt, Inner Mongolia, and its constraint on closure time of Beishan Ocean
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摘要:
石板井A型花岗岩体位于内蒙古北山造山带中段，岩性组成以正长花岗岩为主，二长花岗岩次之。LA-ICP-MS锆石U-Pb测年获得该岩体的侵位年龄为395.6±4.9 Ma（MSWD=3.6，n=15），时代为早泥盆世。岩石属偏铝-弱过铝质高钾钙碱性系列，具有高硅（SiO2=72.71%~76.43%），富碱（K2O+Na2O=7.80%~9.23%），低铝（Al2O3=12.09%~13.73%），贫镁（MgO=0.06%~0.51%）和钙（CaO=0.44%~1.69%），K2O>Na2O的特点；稀土元素配分曲线呈轻稀土元素富集的右倾型，形态呈"海鸥式"分布，Eu强烈亏损（δEu=0.02~0.35，平均0.16）；富集高场强元素Zr、Hf、U、Th和大离子亲石元素Rb、K等，而元素P、Ti、Ba、Sr明显亏损。上述地球化学特征指示该岩体属A型花岗岩，源于下地壳在高温条件下部分熔融及其后长石、磷灰石、榍石等的分离结晶。构造判别图解指示具有A2型花岗岩的特征，形成于后碰撞伸展构造环境，指示牛圈子-洗肠井蛇绿岩带所代表的北山洋闭合时限在早泥盆世之前，早泥盆世该区的构造已由挤压体制转变为伸展体制。
Abstract:The Shibanjing A-type granite intrusion is located in the middle section of the Beishan orogenic belt of Inner Mongolia.Its lithologic composition is dominated by syenogranites, followed by monzogranite.The age of the granite obtained by LA-ICP-MS zircon U-Pb dating is 395.6±4.9 Ma(MSWD=3.6, n=15), suggesting Early Devonian.The rocks belong to the meta-aluminium-weak peraluminous high potassium calc-alkaline series and are characterized by high silicon(SiO2=72.71%~76.43%), rich alkali(K2O+Na2O=7.80%~9.23%), low aluminum(Al2O3=12.09%~13.73%), poor magnesium(MgO=0.06%~0.51%), calcium(CaO=0.44%~1.69%)and K2O > Na2O.The chondrite-normalized REE patterns of the granite belong to the "seagull" pattern of the right-type, with significant negative Eu anomalies(δ Eu=0.02~0.35, averaging 0.16).The granitic rocks are enriched in high field strength elements(e.g., Zr, Hf, U and Th)and large ion lithophile elements(e.g., K and Rb)but depleted in P, Ti, Ba, Sr.All these characteristics resemble features of A-type granites which originated from the partial melting of lower crust under high temperature conditions and the subsequent fractional crystallization of feldspar, apatite, titanite and some other rocks.The tectonic discriminant diagram indicates that it has the characteristics of A2 granite, which was formed in the post-collision extension tectonic environment, indicating that the closure time of the Beishan Ocean represented by the Niuquanzi-Xichangjing ophiolite belt was prior to the Early Devonian, and that the structure of the area in the Early Devonian had changed from a compressional system to an extensional system.
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Keywords:
- Beishan orogenic belt /
- A-type granite /
- zircon U-Pb dating /
- post-collision /
- Beishan Ocean
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致谢: 中国地质调查局天津地质调查中心王惠初研究员、张永高级工程师等在工作过程中给予了大力支持；在野外工作中得到河北省区域地质调查院魏文通高级工程师的帮助；评审专家对文章提出了诸多宝贵意见，在此一并表示衷心感谢。
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图 2 石板井地区正长花岗岩野外特征及薄片显微特征(正交偏光)
a—正长花岗岩侵入奥陶纪片麻状英云闪长岩；b—球状风化；c—块状构造；d—显微特征。Pl—斜长石；Kfs—钾长石；Bi—黑云母；Qtz—石英
Figure 2. Field and microscopic photos of the syenogranite in the Shibanjing area
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图 3 石板井地区二长花岗岩(STW3)锆石阴极发光(CL)图像及其206Pb/238U年龄值
Figure 3. Representative zircons CL images and 206Pb/238U ages of monzogranite(STW3)in Shibanjing area
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图 4 石板井地区二长花岗岩(STW3) LA-ICP-MS锆石U-Pb谐和图
Figure 4. LA-ICP-MS U-Pb concordia diagram of zircon in the monzogranite(STW3)in the Shibanjing area
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图 6 石板井地区正长花岗岩和二长花岗岩A/CNK-A/NK图解(底图据参考文献[24])
Figure 6. A/CNK-A/NK diagram of syenogranite and monzogranite in Shibanjing area
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图 7 石板井地区正长花岗岩、二长花岗岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化蛛网图(b)(标准化值据参考文献[25])
Figure 7. Chondrite-normalized REE patterns(a)and primitive-mantle normalized spider diagrams(b)of syenogranite and monzogranite in Shibanjing area
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图 8 石板井二长花岗岩、正长花岗岩10000×Ga/Al-Nb(a)和10000×Ga/Al-Zr图解(b)(底图据参考文献[31])
Figure 8. 10000×Ga/Al-Nb(a) and 10000×Ga/Al-Zr(b) diagram of syenogranite and monzogranite in Shibanjing area
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图 9 石板井二长花岗岩、正长花岗岩Nb-Y-Ce(a)、Nb-Y-Ce(b)和Y/Nb-Rb/Nb(c)图解(底图据参考文献[36])
Figure 9. Nb-Y-Ce(a), Nb-Y-Ce(b) and Y/Nb-Rb/Nb(c) diagrams of syenogranite and monzogranite in Shibanjing area
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表 1 石板井地区二长花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS zircon U-Th-Pb data for the monzogranite in Shibanjing area
样品号 含量/10-6 同位素比值 年龄/Ma Pb U 206Pb/
238U1σ 207Pb/
235U1σ 207Pb/
206Pb1σ 208Pb/
232Th1σ 232Th/
238U1σ 206Pb/
238U1σ 207Pb/
235U1σ 207Pb/
206Pb1σ 1 424 6666 0.0646 0.0009 0.4864 0.0068 0.0546 0.0008 0.0235 0.0009 0.222 0.001 403 6 402 6 397 31 2 83 976 0.0623 0.0007 0.4828 0.0066 0.0562 0.0008 0.0369 0.0013 0.856 0.006 390 4 400 5 460 32 3 33 403 0.0648 0.0010 0.4878 0.0120 0.0546 0.0019 0.0231 0.0011 1.101 0.008 405 6 403 10 396 77 4 191 2523 0.0607 0.0007 0.4696 0.0081 0.0561 0.0007 0.0592 0.0017 0.395 0.010 380 5 391 7 458 28 5 48 612 0.0622 0.0007 0.4788 0.0066 0.0558 0.0007 0.0417 0.0011 0.572 0.006 389 4 397 5 446 27 6 70 888 0.0646 0.0008 0.4857 0.0113 0.0546 0.0016 0.0216 0.0007 1.042 0.004 403 5 402 9 394 65 7 187 2968 0.0640 0.0008 0.4937 0.0072 0.0559 0.0007 0.0237 0.0006 0.215 0.002 400 5 407 6 450 26 8 67 931 0.0640 0.0010 0.4813 0.0079 0.0545 0.0012 0.0249 0.0007 0.613 0.003 400 6 399 7 394 51 9 60 754 0.0610 0.0006 0.4861 0.0086 0.0578 0.0009 0.0152 0.0003 1.788 0.014 382 4 402 7 523 34 10 62 823 0.0624 0.0007 0.4757 0.0066 0.0553 0.0008 0.0370 0.0008 0.560 0.001 390 5 395 5 425 33 11 77 981 0.0641 0.0007 0.4825 0.0072 0.0546 0.0007 0.0228 0.0006 1.010 0.001 400 4 400 6 397 31 12 157 2302 0.0648 0.0007 0.4945 0.0126 0.0554 0.0013 0.0260 0.0012 0.401 0.002 405 4 408 10 427 53 13 176 2285 0.0647 0.0007 0.4878 0.0081 0.0547 0.0008 0.0197 0.0005 1.050 0.016 404 5 403 7 400 32 14 154 2226 0.0646 0.0007 0.4850 0.0077 0.0544 0.0007 0.0176 0.0004 0.653 0.012 404 5 402 6 388 28 15 91 1171 0.0630 0.0007 0.4781 0.0093 0.0550 0.0008 0.0283 0.0008 0.829 0.005 394 5 397 8 413 33 
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表 2 石板井地区二长花岗岩、正长花岗岩主量、稀土和微量分析结果
Table 2 Analytical results of major, trace elements and REE concentrations of the syenogranite and monzogranite in Shibanjing area
岩性 正长花岗岩 正长花岗岩 正长花岗岩 正长花岗岩 正长花岗岩 正长花岗岩 正长花岗岩 二长花岗岩 二长花岗岩 二长花岗岩 样品编号 YQ0145-1 TL19YQ1 PM02-YQ2 PM27YQ1 PM27YQ2 PM06YQ1 PM06YQ2 SYQ3 PM02-YQ4 PM02-YQ6 SiO2 75.34 76.43 75.57 75.98 76.05 74.91 75.68 73.52 72.71 75.41 TiO2 0.10 0.11 0.19 0.05 0.05 0.15 0.10 0.25 0.27 0.06 Al2O3 12.40 12.41 12.09 12.72 12.64 12.25 12.67 13.73 13.62 13.01 Fe2O3 0.81 1.14 2.04 0.27 0.40 1.09 0.63 0.04 1.13 1.13 FeO 0.90 0.25 0.28 0.75 0.60 0.62 1.11 1.00 0.80 0.14 MnO 0.02 0.01 0.00 0.02 0.03 0.03 0.02 0.02 0.02 0.01 MgO 0.06 0.12 0.13 0.08 0.19 0.13 0.08 0.24 0.51 0.10 CaO 0.79 0.44 0.81 0.80 0.86 0.76 0.81 1.52 1.69 0.84 Na2O 3.45 2.98 3.05 3.58 3.47 4.00 3.66 2.53 2.72 3.75 K2O 5.35 5.49 4.81 5.00 4.84 5.22 4.71 5.89 5.08 4.64 P2O5 0.01 0.01 0.02 0.02 0.03 0.02 0.01 0.04 0.05 0.01 H2O+ 0.46 0.40 0.61 0.40 0.38 0.41 0.36 0.71 0.55 0.40 H2O- 0.16 0.18 0.24 0.12 0.26 0.13 0.11 0.21 0.23 0.12 烧失量 0.73 0.57 0.93 0.72 0.81 0.75 0.48 1.06 1.26 0.83 总计 99.96 99.96 99.93 99.99 99.98 99.96 99.96 99.84 99.87 99.94 TFeO 1.64 1.28 2.14 1.00 0.96 1.61 1.69 1.05 1.85 1.17 Mg# 5.69 14.04 9.63 11.87 26.12 12.81 7.69 29.53 33.10 13.34 K2O/Na2O 1.55 1.84 1.58 1.40 1.39 1.30 1.29 2.33 1.87 1.24 A/CNK 0.96 1.07 1.03 1.00 1.01 0.90 1.01 1.03 1.04 1.02 TZr/℃ 800.23 840.94 841.53 703.63 710.32 806.59 841.58 809.72 800.42 778.85 La 35.70 133.26 55.74 28.11 24.15 60.06 39.08 65.33 66.08 16.50 Ce 100.67 298.72 96.04 60.88 50.77 122.54 87.68 113.19 115.50 31.24 Pr 15.40 34.20 13.46 7.10 6.06 15.84 15.80 14.08 14.52 4.20 Nd 68.54 128.33 49.73 24.41 21.33 57.17 69.12 45.34 48.74 15.88 Sm 20.83 21.75 10.09 5.44 4.55 11.18 22.13 7.05 8.47 3.68 Eu 0.13 0.51 0.91 0.07 0.14 0.46 0.16 0.83 0.87 0.30 Gd 16.63 16.43 9.12 4.85 3.92 9.83 16.00 7.22 8.02 3.10 Tb 3.84 2.67 1.75 0.90 0.71 1.68 3.77 0.94 1.25 0.66 Dy 23.41 13.08 10.75 5.48 4.09 9.70 23.44 4.54 6.73 4.45 Ho 4.36 2.29 2.13 1.06 0.82 1.82 4.24 0.87 1.19 0.88 Er 10.77 6.38 5.74 2.86 2.26 5.13 10.48 2.55 3.12 2.39 Tm 1.71 0.94 0.83 0.53 0.42 0.72 1.45 0.35 0.40 0.37 Yb 9.66 5.69 5.58 3.00 2.52 4.98 8.93 2.41 2.53 2.28 Lu 1.56 1.07 0.97 0.47 0.41 0.94 1.70 0.53 0.56 0.60 ∑REE 313.21 665.30 262.84 145.13 122.15 302.04 303.97 265.23 277.99 86.52 LREE/HREE 3.35 12.70 6.13 6.59 7.07 7.68 3.34 12.67 10.67 4.88 δEu 0.02 0.08 0.28 0.04 0.10 0.13 0.03 0.35 0.32 0.26 (La/Yb)N 2.65 16.79 7.16 6.73 6.88 8.65 3.14 19.44 18.70 5.19 Y 102.95 62.79 56.46 30.07 23.51 46.94 94.82 24.58 29.38 21.76 Rb 231.28 206.40 147.68 228.96 222.24 213.71 199.11 253.05 210.55 158.66 Sr 5.06 11.82 39.86 8.16 24.94 22.07 14.12 110.58 114.20 107.23 Ba 5.00 25.68 180.08 19.74 66.65 57.41 27.72 584.65 568.09 153.40 Ta 1.90 0.66 1.13 2.60 2.17 1.27 1.18 1.68 1.50 0.60 Nb 29.12 12.71 13.64 19.49 17.81 17.96 26.58 15.94 17.17 13.06 Hf 7.57 8.91 10.28 2.66 2.55 9.29 10.97 6.25 5.18 6.78 Zr 197.72 267.29 279.08 57.26 61.51 233.99 291.70 206.05 184.82 143.82 V 19.06 24.11 3.09 20.35 22.40 5.03 3.30 11.31 15.38 4.69 Ni 0.32 0.19 0.59 0.06 0.54 0.50 0.99 0.99 1.86 0.78 Co 0.04 0.01 0.85 0.21 0.38 0.68 0.43 1.63 2.72 0.62 Cs 3.56 1.19 2.10 5.48 4.36 3.64 3.15 5.18 3.64 1.42 Pb 35.09 26.80 10.71 41.92 44.02 28.05 22.63 22.31 16.79 15.46 Th 36.17 29.98 15.02 25.60 31.75 20.78 31.38 28.22 30.88 32.14 U 3.71 3.35 1.71 3.24 2.30 2.75 5.02 2.82 2.95 2.99 Cr 5.12 4.97 3.83 4.26 4.57 4.04 3.93 5.05 7.87 4.85 Ga 25.34 23.48 17.10 17.79 19.39 20.44 22.93 16.62 17.06 17.70 10000*Ga/Al 3.83 3.55 2.64 2.62 2.87 3.13 3.40 2.26 2.33 2.55 注：Mg#=n(Mg)/(n(Mg)+n(Fe))；A/CNK=Al2O3/(Na2O+CaO+K2O)；TZr为计算的锆石饱和温度；δEu= EuN/((SmN+GdN)/2);主量元素含量单位为%，微量和稀土元素含量单位为10-6
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