Geochronology and Geochemistry of Bayanchagan Pluton in Balinyouqi, Inner Mongolia: Implication for Timing of Closure of Paleo-Asian Ocean
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摘要: 古亚洲洋闭合时限一直存在争议.对巴林右旗巴彦查干岩体进行了地球化学、锆石U-Pb测年和Lu-Hf同位素研究,确定其时代和成因,探讨区域构造背景.巴彦查干岩体岩性为二云母二长花岗岩.测年显示,花岗岩侵位于232.0~241.7 Ma,为中晚三叠世.花岗岩富硅和铝,贫镁和铁,属强过铝系列(A/CNK=1.10~1.25),富集轻稀土和大离子亲石元素,亏损重稀土和Nb、Ta等高场强元素,具S型花岗岩特征.锆石的εHf(t)值为-1.8~+4.01,二阶段模式年龄(tDM2)在1 006~1 380 Ma之间.上述研究表明,原始岩浆起源于加厚陆壳的部分熔融.结合内蒙古东南部蛇绿混杂岩、晚古生代岩浆岩带和沉积环境、三叠纪碰撞相关花岗岩带等研究,推测古亚洲洋东段的闭合发生在晚二叠世;三叠纪进入陆陆碰撞阶段.Abstract: It is a highly controversial topic about the closure of the Paleo-Asian Ocean. Based on the geochemistry, zircon U-Pb dating and Lu-Hf isotope studies of Bayanchagan pluton in Balinyouqi, in this paper, it discusses its formation age, petrogenesis and the regional tectonic setting. Bayanchagan pluton is two-mica monzogranites. LA-ICP-MS zircon U-Pb dating indicates the two-mica monzogranite formed in the Middle-Late Triassic(232.0-241.7 Ma). The two-mica monzogranite is high in SiO2, Al2O3 and low in MgO, Fe2O3, belonging to strongly peraluminous series(A/CNK=1.10-1.25), enriched in light rare earth elements and large ion lithophile elements, and depleted in heavy rare earth elements and high field strength elements(Nb, Ta), showing that it is S-type granite. Hf isotopic analysis results show εHf(t) values of -1.8 to +4.01, two-stage model ages ranging from 1 006 Ma to 1 380 Ma, respectively, indicating that the primary magma was derived from the partial melting of a thickened crust. Combined with the studies of the ophiolitic melange, magmatic belt and sedimentary environment of Late Paleozoic, collision related granites, and so on, it is suggested that the eastern segment of the Paleo-Asian Ocean closed in the Late Permian-Early Triassic, and was at the period of continental collision during Triassic.
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Key words:
- Balinyouqi area /
- Middle-Late Triassic /
- S-type granite /
- geochronology /
- geochemistry /
- Paleo-Asian Ocean
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图 1 研究区地质简图
Ⅰ.额尔古纳地块;Ⅱ.兴安地块;Ⅲ.松嫩地块;Ⅳ.佳木斯地块;Ⅴ.完达山地体;Ⅵ.华北北缘增生带;Ⅶ.华北板块;F1.蒙古-鄂霍茨克构造带;F2.塔源-喜贵图构造带;F3.贺根山-黑河构造带;F4.嫩江-八里罕构造带;F5.西拉木伦-长春构造带;F6.赤峰-开原断裂;F7.伊通-依兰断裂;F8.敦化-密山断裂;F9.牡丹江断裂.图b据Wu et al.(2011)修改
Fig. 1. Geological sketch map of the studied area
图 5 巴彦查干三叠纪二云母二长花岗岩的锆石εHf(t)-t图解
Fig. 5. Zircon Hf isotopic features for the Triassic two-mica monzogranites from Bayanchagan
图 6 巴彦查干二云母二长花岗岩SiO2-K2O (a)和A/CNK-A/NK(b)图解
图a据Peccerillo and Taylor(1976);图b据Maniar and Piccoli(1989)
Fig. 6. Plot of SiO2 vs. K2O (a) and A/CNK vs. A/NK (b) for the two-mica monzogranites from Bayanchagan
图 7 巴彦查干二云母二长花岗岩的球粒陨石标准化稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b)
图a标准化值据文献Boynton(1984);图b标准化值据Sun and McDonough(1989)
Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) for the two-mica monzogranites from Bayanchagan
图 8 巴彦查干二云母二长花岗岩成因类型判别图
Fig. 8. Genetic type discrimination for the two-mica monzogranites from Bayanchagan
图 9 巴彦查干二云母二长花岗岩源岩判别图解
A.泥质岩部分熔融;B.杂砂岩部分熔融;C.基性岩源岩部分熔融.据文献Altherr et al.(2000)
Fig. 9. Source rock discrimination diagram for the two-mica monzogranites from Bayanchagan
图 11 巴彦查干二云母二长花岗岩La-La/Sm图解
Fig. 11. La-La/Sm diagram for the two-mica monzogranites from Bayanchagan
图 12 巴彦查干二云母二长花岗岩的R1-R2构造判别图解
R1=4Si-11(Na+K)-2(Fe+Ti);R2=6Ca+2Mg+Al.①地幔斜长花岗岩;②破坏性活动陆缘(板块碰撞前)花岗岩;③板块碰撞后隆起期花岗岩;④晚造山期花岗岩;⑤非造山区A型花岗岩了;⑥同碰撞(S型)花岗岩;⑦造山期后A型花岗岩.据文献Batchelor (1985)
Fig. 12. R1-R2 tectonic discrimination diagram for the two-mica monzogranites from Bayanchagan
图 13 西拉木伦缝合带蛇绿混杂岩及三叠纪花岗岩时空分布特征
据沈阳地质调查中心(2019)《大兴安岭地区区域地质调查片区总结与服务产品开发》项目成果图件修改.图中上标a表示中国地质大学(武汉)(2008)1:25万锡林浩特幅区域地质调查报告; 上标b表示中国地质大学(武汉)(2008)1:25万林西县幅区域地质调查报告; 上标c表示内蒙古自治区第十地质矿产勘查开发院(1997)1:5万双井幅地质图
Fig. 13. Spatio-temporal distribution features of ophiolitic melange and Triassic granites in Xar Moron suture
表 1 巴林右旗巴彦查干二云母二长花岗岩主量、稀土元素、微量元素分析结果及特征参数
Table 1. Representative major and trace element data of two-mica monzogranites(D3172-1)from Bayanchagan in Balinyouqi
样品编号 D3172-1 D3172-2 D3172-3 DB18-1-1 DB18-1-4 1013-1 SiO2 71.20 71.70 72.00 73.17 74.15 74.44 TiO2 0.165 0.140 0.140 0.247 0.120 0.093 Al2O3 15.746 15.695 15.393 14.238 13.794 13.401 Fe2O3 0.771 0.672 0.796 1.572 0.922 0.675 FeO 0.490 0.580 0.450 0.476 0.373 0.810 MnO 0.012 0.014 0.015 0.050 0.054 0.025 MgO 0.372 0.333 0.311 0.172 0.062 0.333 CaO 1.008 0.915 0.800 0.329 0.494 0.422 Na2O 3.435 3.619 3.611 3.950 3.145 2.927 K2O 5.290 5.401 5.219 3.998 5.950 5.983 P2O5 0.115 0.097 0.103 0.078 0.013 0.068 LOI 0.914 0.794 0.905 1.263 0.966 0.625 Total 99.52 99.96 99.74 99.54 100.04 99.80 Na2O+K2O 8.725 9.020 8.830 7.948 9.095 8.910 K2O/Na2O 1.540 1.492 1.445 1.012 1.892 2.044 A/CNK 1.19 1.17 1.18 1.25 1.10 1.11 A/NK 1.38 1.33 1.33 1.32 1.19 1.19 Rb 122.62 119.23 118.63 126.21 171.93 184.72 Ba 1 700.00 1 700.00 1 700.00 709.56 509.85 390.00 Th 12.593 9.900 12.115 23.415 36.098 11.782 U 2.502 1.884 1.925 1.547 6.624 6.001 Ta 0.623 0.600 0.468 3.240 1.291 1.123 Nb 1.59 1.54 1.17 11.45 6.39 7.27 Sr 348.48 335.01 310.33 155.04 191.04 142.28 Zr 136.53 130.87 130.83 158.92 104.83 102.44 Hf 2.584 2.192 2.228 5.283 4.405 3.397 Y 5.864 4.898 5.018 9.844 10.348 7.108 Ni 2.182 1.691 1.362 1.730 3.750 1.515 Cr 8.710 6.890 6.790 10.380 8.280 6.845 Ga 17.05 17.30 16.60 20.44 17.35 17.66 La 41.560 34.574 39.532 31.644 23.743 14.110 Ce 74.770 61.225 70.689 58.710 42.145 31.540 Pr 7.732 6.473 7.504 6.406 5.370 3.825 Nd 25.17 20.88 23.69 21.65 19.55 14.92 Sm 3.191 2.846 2.945 3.639 4.130 3.587 Eu 2.300 2.114 2.129 0.599 0.498 0.502 Gd 3.310 2.757 3.114 2.893 2.995 2.500 Tb 0.264 0.254 0.265 0.459 0.462 0.384 Dy 1.039 0.890 0.965 2.011 1.948 1.344 Ho 0.176 0.148 0.145 0.314 0.313 0.286 Er 0.478 0.462 0.476 0.809 0.828 0.620 Tm 0.074 0.061 0.060 0.113 0.123 0.210 Yb 0.416 0.414 0.381 0.759 0.829 0.718 Lu 0.064 0.053 0.050 0.101 0.110 0.125 (La/Yb)N 71.65 59.90 74.43 29.91 20.54 14.10 δEu 2.16 2.31 2.15 0.56 0.43 0.51 ∑REE 160.55 133.15 151.95 130.11 103.04 74.67 LREE/HREE 26.58 25.42 26.85 16.44 12.54 11.07 10 000Ga/Al 2.05 2.08 2.04 2.71 2.38 2.49 Rb/Nd 4.87 5.71 5.01 5.83 8.79 12.38 Rb/Sr 0.35 0.36 0.38 0.81 0.90 1.30 C/MF 0.70 0.66 0.60 0.19 0.48 0.27 A/MF 6.01 6.22 6.30 4.57 7.40 4.70 La/Sm 13.02 12.15 13.42 8.70 5.75 3.93 锆石饱和温度 784 780 780 797 761 748 注:主量元素质量分数单位为%;稀土元素和微量元素质量分数单位为10-6;锆石饱和温度单位为℃. 表 2 西拉木伦缝合带蛇绿混杂岩化石及同位素统计
Table 2. Fossil and geochronologic data in Xar Moron suture
序号 位置 化石类型 同位素 资料来源 岩性 方法 年龄(Ma) 年代 1 柯单山 薄壳型介形虫 奥陶纪 邵济安等,2017 2 柯单山 超基性岩 Sm-Nd 665±46 新元古代 陈森煌等,1991 3 柯单山 辉长岩 U-Pb 281.1±6.4 早二叠世 叶栩松等,2011 4 柯单山 辉长岩 U-Pb 276 早二叠世 a 5 五道石门 有孔虫 志留纪-现代 邵济安等,2017 6 五道石门 小腕足类 寒武-奥陶纪 邵济安等,2017 7 杏树洼 放射虫 中二叠世 王玉净和樊志勇,1997 8 杏树洼 辉长岩 U-Pb 273.9±1.3 早二叠世 殷东方,2018 9 九井子 辉长岩 U-Pb 274.7±1.7 早二叠世 刘建峰等,2016 10 二八地 牙形石 奥陶-志留纪 邵济安等,2017 注:a为中国地质大学(武汉)(2008)1:25万林西县幅区域地质调查报告. 表 3 西拉木伦缝合带三叠纪花岗岩同位素年龄统计
Table 3. Geochronologic data of Triassic granites in Xar Moron suture
序号 岩体名称 岩石类型 年龄(Ma) 资料来源 1 双井子 二云母花岗岩 229.2±4.1 李锦轶等,2007 2 双井子 二云母二长花岗岩 237.5±2.7 李锦轶等,2007 3 转山子 花岗岩 245.6±0.9 刘建峰等,2014 4 转山子 花岗岩 246±2 Wu et al.,2011 5 建设屯 花岗闪长岩 249±2 刘建峰等,2013 6 龙头山 花岗岩 241±3 刘伟等,2007 7 龙头山 花岗岩 226.2±3.9 Liu et al.,2005 8 新林 花岗闪长岩 241±2 Wu et al.,2011 9 锡林浩特水库南 花岗岩 233±12 a 10 白音锡勒牧场 二长花岗岩 246.4±4.7 b 11 兰家营子 花岗闪长岩 242.1±6.4 a 12 吴营子 正长花岗岩 249 b 13 巴彦查干 二云母二长花岗岩 241.7±0.58 本次 14 巴彦查干 二云母二长花岗岩 232.0±1.9 本次 注:a表示中国地质大学(武汉)(2008)1:25万锡林浩特市幅区域地质调查报告;b表示内蒙古自治区第十地质矿产勘查开发院(1997)1:5万双井幅地质图. -
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