Petrogenesis and Tectonic Setting of the Late Jurassic Low-Mg Adakitic Granites in the Fanjiazhuang Area, Jiaodong Peninsula
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摘要: 胶东地区广泛发育一系列晚侏罗世岩浆作用产生的埃达克质岩,其成因机制及构造背景研究为揭示胶东地区中生代构造演化提供了重要证据.选取出露于胶东苏鲁地区的范家庄花岗岩进行锆石U-Pb年龄、全岩主微量元素和Sr-Nd-Pb同位素组成分析,探讨了岩石成因及成岩构造背景.锆石U-Pb年龄结果表明范家庄花岗岩侵位于晚侏罗世(161±2 Ma).岩石主微量数据具有富硅(SiO2=68.94%~71.00%)、高铝(Al2O3>15.17%)、低镁(MgO=0.32%~0.41%);高Sr、低Y、Yb含量以及高(La/Yb)N(>38.59)比值的特点,同位素测试结果显示相对高的(87Sr/86Sr)i比值(0.709 28~0.711 41)、相对较低的εNd(t)值(-20.5~-14.1)和高放射性Pb同位素组成(206Pb/204Pb)t=16.853~17.207,(207Pb/204Pb)t=15.436~15.495,(208Pb/204Pb)t=37.340~37.629.综合分析认为,范家庄岩体属于低镁埃达克质岩,产于增厚下地壳部分熔融,源区以扬子板块下地壳组分为主,混合有华北板块下地壳成分.晚侏罗世伊泽奈奇板块俯冲形成的弧后拉张环境诱发重力不稳定或者岩石圈伸展造成加厚的造山带垮塌,软流圈上涌的导致加厚地壳部分熔融可能是形成胶东范家庄低镁埃达克岩的地球动力学背景.Abstract: A series of late Jurassic adakitic rocks are widely developed in the Jiaodong Peninsula, eastern China, and their petrogenesis and tectonic setting provide important evidence for Mesozoic tectonic evolution in Jiaodong area. In this study, we investigate the bulk-rock major element, trace element and Sr-Nd-Pb isotopes of the granitoid exposed in the Fanjiazhuang area. LA-ICP-MS zircon U-Pb dating results yield a weighted mean 206Pb/238U age of 161±2 Ma for the Fanjiazhuang granitoid. Geochemical data indicate that the intrusion is characterized by high SiO2(68.94%-71.00%), Al2O3(>15.17%), Sr but low MgO(0.32%-0.41%), Y and Yb contents, and high Sr/Y and La/Yb ratios. The rocks exhibit high initial 87Sr/86Sr ratios (0.709 28 to 0.711 41), low εNd(t) (-20.5 to -14.1) and they are characterized by high radiogenic Pb isotopic compositions with (206Pb/204Pb)t=16.853-17.207, (207Pb/204Pb)t=15.436-15.495, (208Pb/204Pb)t=37.340-37.629. The elemental and isotopic data suggest that the late Jurassic low-Mg adakitic granites in Fanjiazhuang area were derived from the partial melting of the thickened lower crust. The results show that the magma sources were dominated by lower crust of the Yangtze Block and with subordinate lower crust of the North China Block. The Izanagi plate subduction was the most likely geodynamic force for formation of the Jurassic Fanjiazhuang low-Mg adakatic granite in the Jiaodong Peninsula.
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Key words:
- geochemistry /
- Sr-Nd-Pb isotopes /
- low-Mg adakitic /
- Late Jurassic /
- Fanjiazhuang /
- Jiaodong Peninsula
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图 1 胶东地区区域地质简图(a), 范家庄地区地质简图(b)
据高太忠等(1999); 陈海燕(2010)修改
Fig. 1. Geological map of the Jiaodong area (a) and geological map of the Fanjiazhuang area(b)
图 7 原始地幔标准化微量元素蛛网图(a)和球粒陨石标准化稀土元素配分图
球粒陨石及原始地幔标准化数据据Sun and McDonough (1989), 大陆下地壳成分引自(Rudnick and Gao, 2003), 大别造山带低镁埃达克质岩引自(刘质彬, 2017)
Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spider diagram (b) for Fanjiazhuang granite
图 8 埃达克质岩Sr/Y vs. Y和((La/Yb)N vs. YbN判别图解
图a据Ma et al. (2013)修改
Fig. 8. Adakitic trace elemental discrimination diagrams for Fanjiazhuang granite
图 9 范家庄花岗岩Dy/Yb-Dy图解(a), La/Sm-La图解(b), MgO-SiO2图解(c)与TiO2-SiO2图解(d)
c, d.底图据Wang et al. (2007)和Moyen(2009)修改
Fig. 9. Dy/Yb vs. Dydiagram(a), La/Sm-La diagram (b), MgO vs. SiO2 diagram (c) and TiO2 vs. SiO2 diagram for Fanjiazhuang granite
图 10 范家庄花岗岩εNd(t)- (87Sr/86Sr)i图解
Fig. 10. Initial 87Sr/86Sr vs. εNd(t) value for Fanjiazhuang granite.
图 11 范家庄花岗岩207Pb/204Pb(t)- 206Pb/204Pb(t)和208Pb/204Pb(t)- 206Pb/204Pb(t),
图据Yang et al. (2012a)修改, 蚌埠地区荆山及西庐山岩体引自(杨德彬, 2009).
Fig. 11. Initial 207Pb/204Pb and 208Pb/204Pb vs. initial206 Pb/204Pb diagrams for the Fanjiazhuang granite
图 12 伊泽奈奇板块与太平洋板块相互关系复原图(a)及胶东范家庄埃达克质岩演化模式图(b)
图a据肖庆辉等(2010)修改
Fig. 12. Restoration map of the Izanagi plate and the Pacific plate (a); Geodymanic model for the generation and emplacement of the Fanjiazhuang granite in the Shandong Peninsula(b)
表 1 胶东范家庄地区花岗岩(FJZ10-6)锆石LA-ICP-MS U-Pb定年分析结果
Table 1. LA-ICP-MS zircon U-Pb dating results of The Fanjiazhuang granite sample(FJZ10-6) from Shandong Peninsula
分析点号 Th U Th/U U-Th-Pb同位素比值 同位素年龄(Ma) 10-6 10-6 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ FJZ10-6-02 534 844 0.63 0.173 2 0.013 2 0.025 5 0.000 5 162 11 162 3 FJZ10-6-03 371 892 0.42 0.180 4 0.011 5 0.025 3 0.000 5 168 10 161 3 FJZ10-6-04 273 461 0.59 0.183 1 0.017 9 0.025 1 0.000 6 171 15 160 4 FJZ10-6-07 161 272 0.59 0.186 7 0.018 6 0.026 3 0.000 7 174 16 167 4 FJZ10-6-08 141 186 0.76 0.178 1 0.016 4 0.024 7 0.000 7 166 14 157 4 FJZ10-6-09 594 1 859 0.32 0.180 5 0.009 8 0.025 2 0.000 4 168 8 160 3 FJZ10-6-10 296 1 228 0.24 0.183 4 0.012 1 0.025 6 0.000 5 171 10 163 3 FJZ10-6-11 121 704 0.17 0.195 3 0.016 6 0.025 9 0.000 5 181 14 165 3 FJZ10-6-12 176 413 0.43 0.180 8 0.017 0 0.025 0 0.000 5 169 15 159 3 FJZ10-6-13 649 1 931 0.34 0.180 5 0.007 9 0.025 7 0.000 4 168 7 164 3 FJZ10-6-14 2 364 4 718 0.50 0.182 2 0.007 7 0.024 8 0.000 3 170 7 158 2 FJZ10-6-15 734 2 336 0.31 0.176 1 0.010 9 0.024 7 0.000 3 165 9 157 2 表 2 胶东范家庄地区花岗岩石主量元素(%)、微量及稀土元素(10-6)分析结果
Table 2. Major(%) and trace element (10-6) compositions of the Fanjiazhuang granite from Shandong Peninsula
岩性 范家庄花岗岩 样品号 FJZ10-1 FJZ10-2 FJZ10-3 FJZ10-4 FJZ10-5 FJZ10-6 FJZ10-8 FJZ10-9 SiO2 70.6 70.72 71.00 70.19 68.94 70.74 70.91 69.70 TiO2 0.25 0.23 0.26 0.26 0.26 0.21 0.27 0.29 Al2O3 15.52 15.17 15.56 15.60 15.74 15.46 16.33 15.82 Fe2O3T 2.63 2.96 2.54 2.92 2.79 2.37 1.79 1.88 MnO 0.04 0.05 0.04 0.05 0.04 0.04 0.03 0.03 MgO 0.36 0.41 0.35 0.38 0.37 0.32 0.36 0.38 CaO 1.98 1.74 1.94 1.86 2.00 1.84 2.08 2.04 Na2O 4.36 4.15 4.29 4.31 4.39 4.20 4.31 4.31 K2O 4.00 4.15 4.11 4.05 3.97 4.28 3.82 4.13 P2O5 0.06 0.06 0.06 0.06 0.06 0.05 0.06 0.06 LOI 0.22 0.41 0.33 0.48 0.31 0.27 0.30 0.24 Total 100.02 100.05 100.48 100.16 98.87 99.78 100.25 98.87 A/CNK 1.03 1.05 1.03 1.05 1.04 1.04 1.09 1.04 Na2O+K2O 8.36 8.30 8.40 8.36 8.36 8.48 8.13 8.44 K2O/Na2O 0.92 1.00 0.96 0.94 0.90 1.02 0.89 0.96 Mg# 21 22 21 20 21 21 29 28 La 50.82 44.67 42.58 51.39 49.43 48.26 48.81 56.04 Ce 87.12 79.06 70.70 88.81 84.28 80.81 83.03 95.22 Pr 7.78 7.86 7.34 9.00 9.14 8.33 8.24 9.42 Nd 26.16 23.36 22.40 27.25 26.12 24.39 26.54 30.90 Sm 3.49 3.60 3.47 3.75 3.76 3.02 3.58 4.42 Eu 0.88 0.96 0.93 0.96 1.01 0.79 1.01 1.23 Gd 2.32 2.48 2.32 2.24 2.46 1.66 2.11 2.71 Tb 0.31 0.34 0.33 0.33 0.33 0.22 0.31 0.45 Dy 1.35 1.71 1.62 1.37 1.50 0.72 1.69 2.36 Ho 0.27 0.34 0.32 0.28 0.29 0.13 0.33 0.45 Er 0.76 0.90 0.84 0.84 0.86 0.42 0.97 1.22 Tm 0.11 0.13 0.11 0.13 0.12 0.05 0.13 0.19 Yb 0.63 0.83 0.78 0.74 0.78 0.40 0.80 0.99 Lu 0.09 0.10 0.09 0.11 0.12 0.06 0.11 0.13 ∑REE 182.11 166.34 153.84 187.22 180.19 169.27 177.66 205.74 LREE/HREE 30.14 23.33 22.96 29.97 26.93 45.14 26.55 23.19 Sr/Y 102.7 76.8 85.9 101.7 108.5 206.1 106.6 81.7 (La/Yb)N 57.6 38.6 39.2 49.7 45.6 87.6 43.8 40.7 Eu/Eu* 0.89 0.93 0.94 0.94 0.95 0.97 1.04 1.01 Sc 8.67 8.29 7.98 6.96 6.70 6.40 1.95 2.11 V 4.9 8.2 6.4 8.9 7.9 7.3 6.4 6.7 Cr 31.3 27.0 11.1 18.7 18.1 16.8 0.6 1.1 Co 254.11 237.27 231.7 181.22 176.82 186.84 1.49 1.56 Ni 30.4 28.2 23.4 22.5 20.5 23.2 0.7 1.0 Rb 90 101 87 91 84 84 92 93 Sr 911 849 898 946 995 874 1010 1045 Y 8.87 11.05 10.45 9.30 9.17 4.24 9.47 12.80 Zr 199 195 192 214 206 186 198 215 Nb 4.88 12.70 6.68 6.89 7.23 3.78 7.50 8.84 Ba 1 767 1 978 1 714 1 963 2 002 1 869 2 730 2 877 Hf 4.23 4.78 4.24 5.00 4.87 4.75 4.84 5.14 Ta 1.26 1.86 1.28 1.17 1.13 0.99 0.48 0.62 Pb 23.4 31.0 23.0 26.7 27.0 28.3 29.5 29.6 Th 9.81 9.10 7.81 10.05 10.19 9.16 9.02 10.30 U 0.73 1.09 0.81 1.02 1.14 0.88 1.30 0.97 注:LOI.烧失量; Mg#=100 × Mg2+/(Mg2++0.9 ×Fe2O3T); A/CNK = Al2O3/(CaO+Na2O+K2O)摩尔比 -
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