The Petrogenesis and Tectonic Implication of Wengong Intrusion in the Nanling Range
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摘要: 南岭构造带处于古特提斯构造域与古太平洋构造域的复合部位，是研究古特提斯构造域向古太平洋构造域转换的理想地区.温公岩体位于广东省梅州兴宁地区的南岭构造带东段.该岩体LA-ICP-MS锆石U-Pb年代学定年结果为196.9±4.4 Ma，具A型花岗岩的典型地球化学特征，如富硅(69.22%~76.33%)、高Zr+Nb+Ce+Y含量、高FeOt/MgO和10 000×Ga/Al比值、亏损高场强元素和Eu负异常明显等.样品具高钾低镁、准铝质到弱过铝质的特征，其K2O含量为3.81%~4.43%，MgO为0.20%~0.82%，A/CNK比值为0.95~1.10，属于高钾钙碱性花岗岩.样品具相对亏损的Sr-Nd-Hf同位素组成，其εNd(t)为-2.7~-0.5，εHf(t)为+2.1~+7.7.传统观点认为华南地区缺少205~180 Ma的岩浆记录，而本文温公岩体的精确定年结果说明华南东南部地区存在早侏罗世(~197 Ma)岩浆活动.结合区域相关地质资料，我们认为温公岩体形成于陆内伸展的构造背景，主要是基性下地壳部分熔融的产物，并在成岩过程中发生了分离结晶作用.~197 Ma的温公A型花岗岩体是目前华南东南部燕山期识别出的最老A型花岗岩体，结合区域内196~156 Ma的A型花岗岩的特征，指示华南东南部从古特提斯构造域向古太平洋构造域转换的时限应晚于早侏罗世.
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关键词:
- 温公A型花岗岩 /
- 南岭构造带 /
- 锆石U-Pb年代学 /
- Sr-Nd-Hf同位素 /
- 岩石学
Abstract: The early Yanshanian geology of southeastern China is characterized by widespread igneous rocks, especially granites. However, the petrogenesis and tectonic implication of these granites in South China remain highly controversial. The A-type granites are the important carrier for better understanding the tectonic evolution of the South China block since the formation is commonly related to extensional tectonic setting. In this study, a set of new zircon U-Pb geochronological, elemental and Sr-Nd-Hf isotopic data is presented for the Wengong A-type granite in eastern Nanling range in northern Guangdong Province. Laser zircon U-Pb dating for the Wengong granitic sample give a weighted mean age of 196.9±4.4 Ma and in-situ zircon εHf(t) values ranging from +2.1 to +7.7. Their whole rock εNd(t) values range from -2.7 to -0.5. The Wengong granites are enriched in SiO2 (69.22%-76.33%) and total alkalis (7.77%-8.35%). They are metaluminous-peraluminous with A/CNK values ranging from 0.95 to 1.10. These samples have high rare earth element contents, FeOt/MgO (4.40-9.75) and 10 000×Ga/Al ratios (2.9-3.3), as well as significant Sr, Ti and Eu negative anomalies. Based on these geochemical data, it is proposed that the Wengong granites originated from mafic lower crust in response to the earliest Jurassic extensional setting. In combination with available data, it is inferred that the A-type granites in the Nanling range predominantly formed at 196-156 Ma, suggesting an early Yanshanian extensional event in SE China. These A-type granites probably formed in intra-plated extensional environment, indicating the transformation from Paleotethyan to Paleopacific domain after earliest Jurassic.-
Key words:
- Wengong A-type granite /
- Nanling range /
- zircon U-Pb age /
- Sr-Nd-Hf isotope /
- petrology
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图 1 (a)南岭构造带内燕山期花岗岩分布；(b)南岭地区温公岩体地质简图
据陈忠权等(2002)；Zhu et al.(2010)修改
Fig. 1. (a) Distributed pattern of the Yanshanian granites in the Nanling range and (b) geological map of the Wengong intrusions
图 2 南岭地区温公A型花岗岩的显微岩相学特征
Qz.石英；Pl.斜长石；Kf.钾长石；Hb.角闪石；Bi.黑云母
Fig. 2. Photomicrographs of the Wengong A-type granite in the Nanling range
图 3 A/CNK-A/NK和SiO2-K2O
1.温公A型花岗岩(本文)；2.温公A型花岗岩(Zhu et al., 2010)；3.西山岩体(Jiang et al., 2009)
Fig. 3. A/CNK versus A/NK and SiO2 versus K2O for the Wengong A-type granite
图 4 南岭地区温公A型花岗岩的Harker图(图例同图 3)
Fig. 4. Harker diagrams for the Wengong A-type granite in the Nanling range
图 5 (a)原始地幔标准化微量元素蛛网图；(b)球粒陨石标准化稀土元素配分曲线
灰色数据引自Zhu et al.(2010)；西山A型花岗岩数据引自Jiang et al.(2009)；球粒陨石和原始地幔标准化数据引自文献Sun and McDonough(1989)
Fig. 5. Primitive mantle-normalized spidergram (a) and chondrite-normalized REE pattern (b) for the Wengong A-type granite in the Nanling range
图 6 (a)SiO2-Rb图解；(b)SiO2-Ba图解；(c)SiO2-Zr图解；(d)SiO2-Nb图解(图例同图 3)
Fig. 6. Variation diagrams of trace elements versus SiO2 for the Wengong A-type granite in the Nanling range
图 7 代表性锆石的阴极发光照片
Fig. 7. Representive cathodoluminescence images for the Wengong A-type granite
图 8 南岭地区温公A型花岗岩的锆石U-Pb年龄谐和图
Fig. 8. U-Pb concordia diagram for the Wengong A-type granite in the Nanling range
图 9 (a)10 000×Ga/Al-K2O/MgO图解；(b)(Zr+Nb+Ce+Y)-10 000×Ga/Al图解；(c)Nb-Y-Ce图解；(d)Nb-Y-3×Ga图解(图例同图 3)
FG.高分异的I型花岗岩；OGT.未分异的I、S和M型花岗岩
Fig. 9. Plots of (a) 10 000×Ga/Al-K2O/MgO; (b) (Zr+Nb+Ce+Y)-10 000×Ga/Al; (c) Nb-Y-Ce and (d) Nb-Y-3×Ga for the Wengong A-type granite in the Nanling range
图 10 南岭地区温公A型花岗岩的εNd(t)-T图解
南岭地区前寒武纪地壳演化域，据孙涛等(2003)；温公岩体数据引自Zhu et al.(2010)和Yu et al.(2010)；南昆山岩体数据引自Li et al.(2007b)；陂头岩体数据引自He et al.(2010)；西山岩体数据引自Jiang et al.(2009)和付建明等(2004a)；寨背岩体数据引自Li et al.(2003)；金鸡岭岩体数据Jiang et al.(2009)
Fig. 10. Plot of εNd(t)-T for the Wengong A-type granite in the Nanling range
图 11 南岭地区温公A型花岗岩锆石εHf(t)-T图解
Fig. 11. Plot of εHf(t)-T for the Wengong A-type granite in the Nanling range
图 12 (a)Sr-Rb/Sr图解；(b)Sr-Ba图解；(c)Eu*-Sr图解；(d)Sr-Rb图解(图例同图 3)
Pl为斜长石；Kf为钾长石；Hb为角闪石；Bi为黑云母；Cpx为单斜辉石；Opx为斜方辉石
Fig. 12. Sr-Rb/Sr, Sr-Ba, Eu*-Sr and Sr-Rb plots for the Wengong A-type granite in the Nanling range
图 13 南岭地区温公A型花岗岩的构造判别图(图例同图 3)
WPG.板块内花岗岩；VAG.火山弧火山岩；ORG.洋中脊花岗岩；Syn-COLG.同构造的碰撞带花岗岩
Fig. 13. Discrimination diagrams for the Wengong A-type granite in the Nanling range
表 1 南岭地区温公花岗岩的主微量测试结果
Table 1. Major oxides and trace element compositions of the Wengong granitic samples in the Nanling range
样品编号 09XL-18 09XL-19 09XL-22 09XL-24 09XL-31 09XL-32 主量元素(%) SiO2 72.99 73.16 76.12 76.33 69.34 69.22 TiO2 0.44 0.43 0.15 0.16 0.59 0.63 Al2O3 12.92 12.80 12.61 12.52 14.08 14.29 Fe2O3t 3.30 3.25 1.32 1.16 4.06 4.01 CaO 1.27 0.77 0.32 0.36 1.81 1.96 MgO 0.34 0.30 0.23 0.20 0.71 0.82 K2O 3.90 4.15 4.43 4.39 3.83 3.81 Na2O 3.87 3.92 3.71 3.79 4.52 4.36 MnO 0.07 0.06 0.02 0.02 0.06 0.06 P2O5 0.05 0.05 0.02 0.02 0.07 0.08 LOI 0.35 0.62 0.54 0.52 0.48 0.29 Total 99.50 99.51 99.47 99.47 99.55 99.53 FeOt 2.97 2.92 1.19 1.04 3.65 3.61 mg-number 0.19 0.18 0.29 0.29 0.29 0.32 FeOt/MgO 8.73 9.75 5.16 5.22 5.15 4.40 A/CNK 1.00 1.04 1.10 1.07 0.95 0.96 A/NK 1.22 1.17 1.16 1.14 1.21 1.26 微量元素(10-6) Sc 6.02 5.78 0.84 0.88 4.74 5.26 V 3.75 4.36 2.07 3.03 32.00 38.30 Cr 1.11 2.29 1.68 1.71 3.17 4.33 Co 1.63 1.46 0.43 0.46 5.35 6.09 Ni 0.71 0.83 0.12 0.06 2.03 7.78 Ga 20.5 19.4 21.5 21.7 23.3 22.4 Rb 141 153 191 175 103 121 Sr 117.00 123.00 25.40 29.20 113.00 101.00 Y 62.2 47.5 64.6 73.2 57.1 56.5 Zr 423 385 287 358 642 468 Nb 36.4 31.3 31.6 29.2 24.4 34.1 Cs 3.99 2.69 4.73 2.93 1.51 3.46 Ba 736 843 590 673 1 090 841 La 46.6 62.8 67.6 70.0 74.6 71.5 Ce 94.9 127.0 141.0 145.0 154.0 144.0 Pr 12.5 15.8 17.3 17.3 18.8 18.0 Nd 50.4 60.4 64.5 66.2 72.5 70.1 Sm 11.2 12.0 13.0 13.2 13.6 13.3 Eu 2.41 2.34 1.38 1.46 2.58 2.22 Gd 11.7 10.9 12.5 13.0 12.2 12.3 Tb 1.92 1.68 2.02 2.13 1.82 1.81 Dy 11.20 9.53 11.70 12.50 10.40 10.30 Ho 2.21 1.85 2.35 2.49 2.05 2.06 Er 6.14 4.90 6.34 6.81 5.59 5.72 Tm 0.90 0.74 0.96 0.99 0.83 0.85 Yb 5.65 4.86 6.00 6.24 5.32 5.50 Lu 0.84 0.75 0.88 0.93 0.83 0.83 Hf 9.71 10.70 9.01 9.92 13.30 11.70 Ta 2.37 2.17 2.56 2.12 1.50 2.18 Pb 27.7 20.8 29.7 20.9 17.7 23.1 Th 14.5 19.8 21.5 19.7 14.5 19.3 U 3.08 3.11 3.64 3.41 2.22 3.24 Mn 584 534 125 172 553 594 Ge 1.70 1.87 1.56 1.54 1.73 1.63 Zr+Nb+Ce+Y 617 591 524 606 878 703 Eu* 0.64 0.61 0.33 0.34 0.60 0.52 10 000×Ga/Al 3.00 2.90 3.20 3.30 3.10 3.00 TZr(℃) 890 898 888 909 911 875 (La/Yb)N 5.90 9.30 8.10 8.00 10.10 9.30 
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表 2 南岭地区温公花岗岩的Sr-Nd同位素测试结果
Table 2. Sr and Nd isotopic compositions of the Wengong granitic samples in the Nanling range
样品号 年龄(Ma) Rb Sr Rb/Sr 87Rb/86Sr 87Sr/86Sr 2σ (87Sr/86Sr)i Sm Nd 147Sm/144Nd 143Nd/144Nd 2σ TDM(Ga) εNd(t) 09XL-18 197 141 117 1.2 3.501 0.720一264 6 0.710一461 11.2 50.4 0.135 0.512一422 5 1.41 -2.7 09XL-32 197 121 101 1.2 3.452 0.717一175 6 0.707一509 13.3 70.1 0.114 0.512一505 4 0.99 -0.5
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表 3 南岭地区温公花岗岩(09XL-22) 的LA-ICP-MS锆石U-Pb同位素测试结果
Table 3. Laser zircon U-Pb dating results for the Wengong granitic sample (09XL-22) in the Nanling range
分析点 U(10-6) Th(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 206Pb/238U 207Pb/235U 比值 1σ 比值 1σ 比值 1σ 比值 1σ 比值 1σ 比值 1σ 温公花岗岩(09XL-22) 1 619 648 1.05 0.049 51 0.002 20 0.219 80 0.009 10 0.032 20 0.000 82 172.0 100.7 204.3 5.2 201.7 7.6 2 417 380 0.91 0.050 02 0.001 99 0.230 42 0.008 59 0.033 40 0.000 80 196.1 89.9 211.8 5.0 210.5 7.1 3 607 660 1.09 0.050 03 0.002 61 0.220 66 0.010 68 0.031 98 0.000 89 196.5 116.9 202.9 5.6 202.5 8.9 4 712 657 0.92 0.049 63 0.002 01 0.213 61 0.008 02 0.031 21 0.000 77 177.6 91.8 198.1 4.8 196.6 6.7 5 601 651 1.08 0.051 97 0.003 64 0.237 19 0.015 27 0.033 09 0.001 15 284.1 152.6 209.9 7.2 216.1 12.5 6 468 316 0.68 0.049 15 0.001 93 0.223 24 0.008 28 0.032 93 0.000 76 155.0 89.3 208.9 4.8 204.6 6.9 7 721 710 0.98 0.052 73 0.002 76 0.217 81 0.010 46 0.029 95 0.000 86 317.2 114.4 190.2 5.4 200.1 8.7 8 704 631 0.90 0.051 29 0.002 05 0.214 47 0.007 96 0.030 31 0.000 75 253.8 89.5 192.5 4.7 197.3 6.7 9 630 590 0.94 0.052 29 0.001 84 0.229 29 0.007 51 0.031 79 0.000 74 297.9 78.1 201.7 4.6 209.6 6.2 10 1 134 1 365 1.20 0.051 50 0.001 62 0.211 85 0.006 22 0.029 82 0.000 67 263.5 70.8 189.4 4.2 195.1 5.2 11 594 507 0.85 0.051 50 0.005 54 0.216 21 0.021 33 0.030 43 0.001 48 263.5 229.3 193.2 9.2 198.8 17.8 12 700 717 1.02 0.051 58 0.002 41 0.207 77 0.008 95 0.029 19 0.000 78 267.0 103.5 185.5 4.9 191.7 7.5 13 428 405 0.95 0.053 51 0.004 32 0.202 74 0.015 09 0.027 46 0.001 03 350.6 172.8 174.6 6.5 187.4 12.7 14 663 604 0.91 0.049 91 0.002 04 0.212 44 0.008 09 0.030 85 0.000 75 190.6 92.3 195.9 4.7 195.6 6.8 15 384 344 0.90 0.049 17 0.002 19 0.207 69 0.008 73 0.030 61 0.000 74 156.1 101.0 194.4 4.7 191.6 7.3 16 501 499 1.00 0.050 85 0.001 84 0.221 06 0.007 48 0.031 50 0.000 73 234.2 81.4 199.9 4.6 202.8 6.2 17 827 771 0.93 0.049 74 0.001 38 0.200 96 0.005 27 0.029 28 0.000 62 183.0 63.5 186.0 3.9 185.9 4.5
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表 4 南岭地区温公花岗岩(09XL-22) 的LA-ICP-MS锆石Lu-Hf同位素测试结果
Table 4. Laser zircon Lu-Hf isotopic compositions of the Wengong granitic sample (09XL-22) in the Nanling range
分析点 年龄(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(0) εHf(t) TDM(Ma) TDMC(Ma) fLu/Hf 09XL-22-01 197 0.041 161 0.001 394 0.282 811 0.000 034 0.282 806 1.4 5.5 632 886 -0.96 09XL-22-02 197 0.032 502 0.001 114 0.282 786 0.000 032 0.282 782 0.5 4.7 663 939 -0.97 09XL-22-03 197 0.050 930 0.001 711 0.282 762 0.000 030 0.282 756 -0.3 3.8 708 999 -0.95 09XL-22-04 197 0.052 799 0.001 723 0.282 748 0.000 033 0.282 742 -0.8 3.3 728 1 030 -0.95 09XL-22-05 197 0.059 279 0.002 011 0.282 787 0.000 034 0.282 780 0.5 4.6 678 945 -0.94 09XL-22-06 197 0.029 062 0.000 985 0.282 820 0.000 029 0.282 816 1.7 5.9 613 862 -0.97 09XL-22-07 197 0.068 443 0.002 298 0.282 717 0.000 037 0.282 709 -1.9 2.1 785 1 105 -0.93 09XL-22-08 197 0.041 146 0.001 385 0.282 821 0.000 034 0.282 816 1.7 5.9 618 863 -0.96 09XL-22-09 197 0.063 868 0.002 145 0.282 842 0.000 033 0.282 834 2.5 6.5 601 822 -0.94 09XL-22-10 197 0.065 760 0.002 176 0.282 794 0.000 034 0.282 786 0.8 4.8 671 931 -0.93 09XL-22-11 197 0.033 654 0.001 124 0.282 739 0.000 030 0.282 735 -1.2 3.0 730 1 047 -0.97 09XL-22-12 197 0.047 202 0.001 588 0.282 741 0.000 033 0.282 735 -1.1 3.0 736 1 045 -0.95 09XL-22-13 197 0.039 899 0.001 351 0.282 874 0.000 037 0.282 869 3.6 7.7 542 743 -0.96 09XL-22-14 197 0.058 096 0.001 972 0.282 798 0.000 043 0.282 790 0.9 5.0 662 921 -0.94 09XL-22-15 197 0.040 332 0.001 396 0.282 812 0.000 033 0.282 806 1.4 5.5 632 884 -0.96 09XL-22-16 197 0.058 469 0.001 998 0.282 857 0.000 035 0.282 850 3.0 7.1 575 786 -0.94 09XL-22-17 197 0.052 682 0.001 758 0.282 776 0.000 034 0.282 770 0.2 4.3 689 967 -0.95
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表 5 华南东南部中生代A型花岗岩锆石U-Pb年代学统计
Table 5. Synthesis of zircon U-Pb age data of the Mesozoic A-type granites in SE South China
岩体名称 岩石类型 测试方法 年龄值(Ma) 参考文献 省份 髙溪 碱性花岗岩 LA-ICP-MS锆石U-Pb 229.0±2.0 Zhao et al.(2013) 福建 蔡江 二长花岗岩 LA-ICP-MS锆石U-Pb 228.0±2.0 Zhao et al.(2013) 江西 翁山 二长花岗岩 SHRIMP锆石U-Pb 225.0±1.0 Sun et al.(2011) 浙江 靖居 正长花岗岩 LA-ICP-MS锆石U-Pb 215.0±2.0 李万友等(2012) 浙江 温公 石英二长岩 SHRIMP锆石U-Pb 196.0±2.0 余心起等(2009) 广东 钾长花岗岩 SIMS锆石U-Pb 192.0±1.0 Zhu et al.(2010) 广东 柯树北 黑云母花岗岩 SHRIMP锆石U-Pb 189.0±3.0 Li et al.(2007) 江西 陂头 碱长花岗岩 LA-ICP-MS U-Pb锆石 178.6±1.5 He et al.(2010) 江西 寨背 钾长花岗岩 SHRIMP锆石U-Pb 171.6±4.6 Li et al.(2003) 江西 菜岭 二长花岗岩 SHRIMP锆石U-Pb 160.0±2.0 付建明等(2004c) 湖南 南昆山 铝质花岗岩 SHRIMP锆石U-Pb 158.0±5.0 Li et al.(2007) 广东 芙蓉 二长花岗岩 SHRIMP锆石U-Pb 157.0±3.0 Zhu et al.(2009) 湖南 金鸡岭 铝质花岗岩 SHRIMP锆石U-Pb 156.0±2.0 付建明等(2004b) 湖南 西山 铝质花岗岩 SHRIMP锆石U-Pb 156.0±2.0 付建明等(2004a) 湖南 杨梅湾 花岗岩 LA-ICP-MS锆石U-Pb 135.1±1.7 Yang et al.(2012) 浙江 大桥坞 花岗斑岩 LA-ICP-MS锆石U-Pb 134.3±1.2 Yang et al.(2012) 浙江 大洲 流纹岩 SHRIMP锆石U-Pb 127.3±1.7 Yang et al.(2013) 浙江 白菊花尖 准铝质花岗岩 SHRIMP锆石U-Pb 126.0±3.0 Wong et al.(2009) 浙江 城山 碱性花岗岩 LA-ICP-MS U-Pb锆石 124.8±2.1 Wu et al.(2012) 安徽 花山 碱性花岗岩 SHRIMP锆石U-Pb 125.0±2.0 王强等(2005) 安徽 新村 碱性花岗岩 LA-ICP-MS锆石U-Pb 105.0±1.0 Chen et al.(2013) 福建 青田 碱性花岗岩 LA-ICP-MS锆石U-Pb 101.2±2.0 邱检生等(1999) 浙江 普陀岛 碱性花岗岩 LA-ICP-MS锆石U-Pb 93.4±0.6 邱检生等(1999) 福建 桃花岛 碱性花岗岩 LA-ICP-MS锆石U-Pb 92.9±0.6 邱检生等(1999) 浙江 注：数据来自邱检生等, 1999; Li et al., 2003 , 2007b; 付建明等, 2004a, 2004b, 2004c; 王强等, 2005; Li and Li, 2007;Wong et al., 2009 ; 余心起等, 2009;Zhu et al., 2009 , 2010;He et al., 2010 ;Sun et al., 2011 ; 李万友等, 2012;Yang et al., 2012 , 2013;Chen et al., 2013 ;Zhao et al., 2013 .
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