Zircon U-Pb Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of the Neoproterozoic Granites on the Southeastern Margin of the Yangtze Block: Constraint on Crustal Growth
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摘要: 出露于扬子板块东南缘的九宫山片麻状花岗岩侵位于早新元古代双桥山群.通过阴极发光图像分析和LA-ICP-MS锆石U-Pb年龄测试表明，九宫山岩体的岩浆结晶年龄为830±8 Ma；4个继承锆石分析点给出加权平均值为873±7 Ma的年龄值，可能记录了新元古代早期扬子与华夏板块碰撞产生的岩浆活动.九宫山岩体具有高SiO2（71.83%~74.20%）、高K2O+Na2O（7.06%~7.90%）、低基性组分（∑TiO2+FeOT+MgO=2.64%~4.00%）的含量特征，高K2O/Na2O比值（1.25~1.64），铝饱和指数（A/CNK）为1.03~1.27，主要为弱过铝质花岗岩.岩石具有轻稀土富集的右倾模式和明显的Eu负异常（Eu/Eu*=0.35~0.47），K、Rb、Th、U等大离子亲石元素富集，Sr、P、Nb、Ta、Ti等相对亏损.全岩εNd（t）值为-1.49~+5.24，同岩浆锆石和继承锆石的εHf（t）值分别为3.5±1.0~11.0±1.1、5.1±0.9~12.9±1.1，指示岩浆源区含有显著的新生地壳物质.九宫山岩体可能形成于陆内裂谷环境，由类似双桥山群的变质砂屑岩和火山岩部分熔融形成.区域对比表明，江南造山带新元古代中期花岗岩的Nd-Hf同位素组成具有从东向西逐渐降低的特征，表明该区早新元古代时期新生地壳物质对花岗岩的影响由东向西呈减弱趋势，这可能是扬子与华夏板块碰撞拼合过程中岛弧岩浆作用由东向西逐渐减弱而使新生地壳物质减少所引起.Abstract: The Jiugongshan gneissic granites exposed in the southeastern margin of the Yangtze Block, and intruded into the Shuangqiaoshan Group of Early Neoproterozoic. Using the methods of cathodoluminescent images analyzing and LA-ICP-MS zircon U-Pb dating, we obtained a magma crystallization age of 830±8 Ma for the Jiugongshan intrusion. Four spots of inherited zircons yield a weighted mean at 873±7 Ma. This age might record the magmatic activity related to the collision between the Yangtze and Cathaysia blocks during the period of Early Neoproterozoic. The Jiugongshan granites are characterized by high SiO2 (71.83%-74.20%), high K2O+Na2O (7.06%-7.90%), low contents of mafic components (∑TiO2+FeOT+MgO=2.64%-4.00%) and high K2O/Na2O ratios (1.25-1.64). They mainly belong to weakly peraluminous granites with A/CNK ratios (1.03-1.27). They share similar distribution patterns of REE and trace elements, i.e., enrichment in LREE and large-ion lithophile elements of K, Rb, Th and U, depletion in Sr, P and high-field-strength elements of Nb, Ta and Ti, and pronounced negative Eu anomalies (Eu/Eu*=0.35-0.47).On the other hand, they have neutral whole-rock εNd(t) values of -1.49 to +5.24 and positive εHf(t) values of 3.5±1.0 to 11.0±1.1 and 5.1±0.9 to 12.9±1.1 respectively for the coeval magmatic zircon and inherited zircon.This indicates a magmatic source with significant components of the juvenile crust. The Jiugongshan intrusion might be formed in the environment of intracontinent rift and generated by partial melting of metamorphic psammitic and volcanic source. Regional comparison shows that the Nd-Hf isotopic composition of the Middle Neoproterozoic granites along the Jiangnan orogeny has the characteristics of decreased gradually from east to west, and suggests that the effect of the Early Neoproterozoic juvenile crust on granitic magmatism decreased from east to west. This might be caused by the decreasing of arc magmatic components from east to west among the orogenetic process.
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图 1 (a) 华南地质简图及研究区位置；(b)扬子板块东南缘九宫山岩体地质简图和采样点位置
a.引自Li et al.(2003a)；b.根据1：20万地质图修改
Fig. 1. (a) A geological sketch map of South China, with the location of studying area and (b) simplified geological map showing the distribution of the Jiugongshan intrusions and sampling localities at the southeastern margin of the Yangtze Block
图 2 九宫山岩体野外和显微照片
a.九宫山岩体野外照片，岩石片麻状构造显著；b.九宫山岩体野外照片，岩石片麻状构造明显；c.斑状细粒二长花岗岩中暗色微粒包体野外照片；d.正交偏光下斑状细粒二长花岗岩显微照片.Kf.钾长石; Pl.斜长石; Q.石英; Bi.黑云母
Fig. 2. Field photographs and photomicrographs of the rocks from the Jiugongshan intrusion
图 3 九宫山岩体Q-A-P图解
1a.石英岩；1b.富石英花岗岩; 2.碱性长石花岗岩；3a.正长花岗岩；3b.二长花岗岩；4.花岗闪长岩；5.英云闪长岩；6*.石英碱性长石正长岩；7*.石英正长岩；8*.石英二长岩；9*.石英二长闪长岩/石英二长辉长岩；10*.石英闪长岩/石英辉长岩/石英斜长岩；6.碱性长石正长岩；7.正长岩；8.二长岩；9.二长闪长岩/二长辉长岩；10.闪长岩/辉长岩/斜长岩；引自Streckeisen(1974)
Fig. 3. Q-A-P diagram for the Jiugongshan intrusion
图 4 九宫山岩体代表性锆石的阴极发光(CL)图像及U-Pb年龄(Ma)、εHf(t)值
实线圆表示U-Pb年龄分析点，虚线圆表示Hf同位素分析点，旁边数字分别代表εHf(t)值和206Pb/238U年龄
Fig. 4. Representative CL images with U-Pb ages (Ma) and εHf(t) values of zircons from the Jiugongshan pluton
图 5 九宫山岩体的LA-ICP-MS锆石U-Pb年龄谐和图
Fig. 5. LA-ICP-MS zircon U-Pb concordia diagram for the Jiugongshan pluton
图 6 九宫山岩体A/NK-A/CNK图解
Fig. 6. A/NK vs.A/CNK diagram for the Jiugongshan pluton
图 7 九宫山岩体(a)球粒陨石标准化稀土元素分布型式和(b)原始地幔标准化微量元素蛛网图
球粒陨石REE值引自Sun and McDonough(1989)；原始地幔微量元素值引自McDonough and Sun(1995)；赣西北花岗闪长岩数据引自Li et al.(2003a)；皖南花岗闪长岩数据引自Li et al.(2003a)，Wu et al.(2006a)
Fig. 7. (a) Chondrite-normalized REE patterns and (b) primitive mantle-normalized trace element spidergrams for the Jiugongshan pluton
图 8 九宫山岩体全岩εNd(t)值-年龄图解
数据来源：皖南花岗岩引自Li et al.(2003a)，Wu et al.(2006a)；赣西北花岗闪长岩引自Li et al.(2003a)，钟玉芳(2007)；桂北花岗岩引自Li et al.(2003a)，Wang et al.(2006)；双桥山群引自Chen and Jahn(1998)，张海祥等(2000)
Fig. 8. Whole-rock εNd(t) values vs.ages diagram for the Jiugongshan pluton
图 9 九宫山岩体锆石U-Pb年龄-εHf(t)值图解
数据来源：皖南花岗岩引自Wu et al.(2006a)；赣西北花岗闪长岩钟玉芳(2007)；桂北花岗岩王孝磊等(2006)，Zheng et al.(2007); 亏损地幔演化线用176Hf/177Hf=0.283 25和176Lu/177Hf=0.038 4(Griffin et al., 2000)来计算；地壳增生曲线用平均地壳的176Lu/177Hf比值0.015(Griffin et al., 2002)来计算
Fig. 9. Zircon εHf(t) values vs.U-Pb ages diagram for Jiugongshan pluton
图 10 九宫山岩体锆石Hf模式年龄(TDM2)柱状图
Fig. 10. Histogram of two-stage model Hf ages for the Jiugongshan pluton
图 11 九宫山岩体(a)Eu/Eu*-SiO2、(b)Sr-Eu/Eu*和(c)Ba-Eu/Eu*图解
Fig. 11. Diagrams of (a) Eu/Eu* vs. SiO2, (b) Sr vs. Eu/Eu* and (c) Ba vs. Eu/Eu* for the Jiugongshan pluton
图 12 江南造山带早新元古代火山岩εNd(900 Ma)值柱状图
数据来源：桂北四堡群火山岩韩发等(1994)，李献华(1996)，Zhou et al.(2004)；赣北双桥山群火山岩引自Chen and Jahn(1998)；浙北双溪坞群火山岩沈渭洲等(1991)，徐步台和邱郁双(1996)以及Li et al.(2009)
Fig. 12. Histogram of εNd(900 Ma) values for the early Neoproterozoic volcanics at the Jiangnan orogeny
表 1 九宫山片麻状花岗岩LA-ICP-MS锆石U-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Pb isotope analytical results for the Jiugongshan gneissic granites
分析点 元素含量(10-6) Th/U 同位素比值 年龄(Ma) Pb Th U 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 08JGS34 1.1 51.7 76 316 0.24 0.067 06 0.001 09 1.286 25 0.021 21 0.138 62 0.001 20 840 20 840 9 837 7 2.1 36.1 74 215 0.35 0.067 58 0.001 26 1.295 95 0.023 60 0.138 73 0.001 15 856 24 844 10 837 6 3.1 66.4 54 430 0.13 0.067 24 0.001 21 1.249 75 0.022 14 0.134 30 0.001 06 845 24 823 10 812 6 4.1 64.0 63 435 0.14 0.067 17 0.001 30 1.181 82 0.022 63 0.127 17 0.001 23 843 24 792 11 772 7 5.1 43.1 63 243 0.26 0.069 05 0.001 40 1.388 54 0.027 40 0.145 50 0.001 29 900 26 884 12 876 7 6.1 91.3 84 608 0.14 0.068 96 0.001 08 1.242 20 0.019 13 0.130 17 0.001 07 897 19 820 9 789 6 7.1 28.6 143 144 0.99 0.068 59 0.001 37 1.310 37 0.024 19 0.138 68 0.001 32 886 23 850 11 837 7 8.1 16.3 66 81 0.82 0.072 23 0.001 84 1.444 51 0.036 19 0.144 89 0.001 47 992 34 908 15 872 8 9.1 63.7 64 426 0.15 0.067 98 0.001 10 1.216 35 0.019 82 0.129 08 0.001 23 868 19 808 9 783 7 10.1 46.9 171 258 0.66 0.068 36 0.001 27 1.287 21 0.023 11 0.136 00 0.001 16 880 23 840 10 822 7 11.1 46.1 59 265 0.22 0.068 03 0.001 21 1.359 83 0.023 10 0.144 39 0.001 15 869 22 872 10 869 6 12.1 60.1 65 363 0.18 0.066 08 0.001 03 1.276 40 0.019 58 0.139 52 0.001 15 809 19 835 9 842 6 13.1 101.1 236 617 0.38 0.065 78 0.000 99 1.207 81 0.018 20 0.132 49 0.001 01 799 19 804 8 802 6 14.1 65.9 191 363 0.53 0.066 63 0.001 31 1.279 29 0.024 55 0.138 65 0.001 17 826 26 837 11 837 7 15.1 39.9 51 240 0.21 0.066 14 0.001 85 1.243 35 0.032 05 0.136 34 0.001 46 811 60 820 15 824 8 16.1 91.3 322 505 0.64 0.068 93 0.001 27 1.282 73 0.024 46 0.134 40 0.001 12 897 26 838 11 813 6 17.1 62.8 208 315 0.66 0.067 88 0.001 27 1.368 55 0.026 11 0.145 77 0.001 37 865 24 876 11 877 8 18.1 157.7 1 100 792 1.39 0.066 62 0.001 03 1.170 75 0.018 57 0.126 99 0.000 99 826 20 787 9 771 6 19.1 48.8 289 227 1.27 0.066 73 0.001 27 1.287 91 0.025 20 0.139 49 0.001 20 830 26 840 11 842 7 20.1 105.2 83 278 0.30 0.111 23 0.001 58 4.713 81 0.074 78 0.306 20 0.003 03 1 820 15 1 770 13 1 722 15 21.1 25.1 55 145 0.38 0.068 87 0.002 33 1.303 20 0.041 93 0.137 23 0.001 43 895 71 847 18 829 8 22.1 89.0 78 232 0.34 0.114 12 0.001 55 4.771 64 0.063 50 0.302 22 0.002 23 1 866 14 1 780 11 1 702 11 23.1 87.0 646 409 1.58 0.067 82 0.001 01 1.211 58 0.018 72 0.128 94 0.001 02 863 19 806 9 782 6 
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表 2 九宫山片麻状花岗岩的主量元素(%)和微量元素(10-6)分析结果
Table 2. Major (%) and trace element (10-6) data for the Jiugongshan gneissic granites
样品号 08JGS25 08JGS26 08JGS34 08JGS37 08JGS38 08JGS39 SiO2 74.20 72.89 72.36 72.47 73.99 71.83 TiO2 0.28 0.30 0.38 0.37 0.24 0.39 Al2O3 13.45 13.74 13.33 13.55 13.04 13.75 Fe2O3T 1.67 1.98 2.34 2.36 1.71 2.49 MnO 0.03 0.04 0.05 0.05 0.05 0.05 MgO 0.87 0.89 0.61 0.62 0.50 0.85 CaO 0.57 1.14 1.41 1.51 1.04 2.14 Na2O 2.80 3.43 3.33 3.27 3.16 3.09 K2O 4.58 4.30 4.53 4.63 4.69 3.97 P2O5 0.09 0.08 0.10 0.11 0.10 0.08 H2O+ 0.96 0.71 0.93 0.58 0.92 0.85 CO2 0.15 0.15 0.22 0.07 0.22 0.11 总量 99.65 99.65 99.59 99.59 99.66 99.60 K2O/Na2O 1.64 1.25 1.36 1.42 1.48 1.28 A/CNK 1.27 1.11 1.03 1.03 1.07 1.04 Mg# 45.50 41.90 29.50 29.70 31.90 35.40 Sc 6.26 6.33 7.38 7.12 5.79 8.05 V 31.60 29.80 32.70 33.60 22.40 41.10 Cr 15.00 14.50 9.40 10.20 9.00 15.10 Co 3.96 4.78 4.60 5.03 3.43 6.37 Ni 6.78 7.32 5.55 5.86 5.04 8.67 Ga 18.40 16.20 17.00 16.70 15.20 16.30 Rb 218.00 216.00 180.00 196.00 251.00 174.00 Sr 90.50 120.80 89.80 96.40 95.80 112.00 Y 22.00 25.00 43.00 41.80 45.20 38.60 Zr 134.00 139.00 186.00 163.00 121.00 181.00 Nb 7.70 7.73 7.55 7.36 6.85 7.04 Cs 22.30 13.70 9.20 19.30 22.20 14.50 Ba 542.00 475.00 554.00 574.00 379.00 499.00 La 24.00 25.10 29.00 29.20 24.00 31.00 Ce 49.70 52.30 60.30 61.40 51.10 64.90 Pr 5.92 6.23 7.39 7.53 6.17 7.83 Nd 21.70 23.00 27.60 28.80 23.20 29.70 Sm 4.54 5.00 6.09 6.23 5.36 6.22 Eu 0.67 0.73 0.89 0.95 0.62 0.94 Gd 4.27 4.66 6.12 6.48 5.49 6.17 Tb 0.66 0.75 1.07 1.12 1.06 1.05 Dy 3.81 4.39 6.68 6.91 6.95 6.44 Ho 0.72 0.86 1.44 1.45 1.53 1.34 Er 2.05 2.28 3.88 4.05 4.49 3.61 Tm 0.31 0.35 0.59 0.58 0.74 0.55 Yb 2.00 2.26 3.84 3.69 4.78 3.46 Lu 0.29 0.34 0.55 0.54 0.71 0.52 Hf 4.02 4.12 5.15 4.91 3.97 5.27 Ta 0.96 0.95 0.66 0.72 1.30 0.74 Pb 30.30 19.00 29.30 29.30 98.80 28.10 Th 15.00 15.70 15.40 15.40 16.40 16.80 U 2.49 2.33 3.37 3.40 3.28 3.08 Eu/Eu* 0.47 0.46 0.45 0.46 0.35 0.47 (La/Yb)N 8.62 7.94 5.42 5.68 3.60 6.42 M 1.12 1.31 1.41 1.42 1.33 1.42 TZr(℃) 791.00 780.00 799.00 786.00 767.00 796.00 注：Fe2O3T为全铁; A/CNK=摩尔Al2O3/(CaO+Na2O+K2O); Mg#=100×Mg2+/(Mg2++TFe2+); Eu/Eu*=EuN/(SmN×GdN)1/2; 下标N表示球粒陨石标准化数据, 球粒陨石标准化数值引自Sun and McDonough(1989); M=(Na+K+2×Ca)/(Al×Si)(Watson and Harrison, 1983); TZr=12 900/[2.95+0.85M+ln(496 000/Zrmelt)]( Miller et al., 2003 ); Zrmelt为熔体中Zr含量.
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表 3 九宫山片麻状花岗岩全岩Sr-Nd同位素分析结果
Table 3. Whole-rock Sr and Nd isotopic compositions for the Jiugongshan gneissic granites
样品号 87Rb/86Sr 87Sr/86Sr ±(2σ) (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd ±(2σ) εNd(t) TDM1(Ga) TDM2(Ga) 08JGS25 7.010 9 0.766 963 0.000 006 0.683 843 0.126 7 0.512 525 0.000 005 5.24 1.09 1.07 08JGS26 5.212 7 0.772 582 0.000 005 0.710 782 0.131 5 0.512 207 0.000 004 -1.49 1.74 1.62 08JGS34 5.840 5 0.776 020 0.000 006 0.706 777 0.133 2 0.512 309 0.000 009 0.33 1.59 1.47 08JGS37 5.922 6 0.777 223 0.000 007 0.707 006 0.131 0 0.512 394 0.000 004 2.23 1.39 1.32 08JGS38 7.638 3 0.789 728 0.000 005 0.699 170 0.140 0 0.512 474 0.000 005 2.83 1.40 1.27 08JGS39 4.518 9 0.762 827 0.000 007 0.709 252 0.126 5 0.512 308 0.000 003 1.01 1.47 1.42 注：(1)87Rb/86Sr和147Sm/144Nd比值用全岩Rb、Sr、Sm和Nd含量(表 2)计算；(2)(87Sr/86Sr)i=(87Sr/86Sr)S+(87Rb/86Sr)S× (eλt-1), λ=1.42×10-11a-1；(3)εNd(t)=[(143Nd/144Nd)S/(143Nd/144Nd)CHUR(t)-1]×104, (143Nd/144Nd)CHUR(t)=0.512 638-0.196 7×(eλt-1)；(4)TDM1=1/λ×ln{1+[((143Nd/144Nd)S-(143Nd/144Nd)DM)/((147Sm/144Nd)S-(147Sm/144Nd)DM)]}; TDM2=1/λ×ln{1+[(143Nd/144Nd)S-(143Nd/144Nd)DM-((147Sm/144Nd)S-(147Sm/144Nd)C) ×(eλt-1)]/[ (147Sm/144Nd)C-(147Sm/144Nd)DM]}; 公式中的下标S、CHUR、DM、C分别表示样品测量值、球粒陨石值、亏损地幔值、大陆地壳平均值, (143Nd/144Nd)DM=0.513 15, (147Sm/144Nd)DM=0.213 7, (147Sm/144Nd)C=0.118;λSm-Nd=6.54×10-12a-1; t代表岩浆结晶年龄为830 Ma.
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表 4 九宫山片麻状花岗岩锆石Hf同位素分析结果
Table 4. Zircon Hf isotopic compositions for the Jiugongshan gneissic granites
点号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf ±(2σ) 年龄(Ma) (176Hf/177Hf)i εHf(t) ±(2σ) TDM1(Ga) TDM2(Ga) ±(2σ) 年龄点 08JGS34 1 0.122 103 0.004 194 0.282 508 0.000 025 830 0.282 442 6.7 0.9 1.15 1.30 0.11 1.1 2 0.104 305 0.003 471 0.282 478 0.000 027 830 0.282 424 6.0 0.9 1.17 1.34 0.12 2.1 3 0.123 278 0.004 161 0.282 629 0.000 030 830 0.282 564 11.0 1.1 0.96 1.03 0.13 3.1 4* 0.087 263 0.002 854 0.282 417 0.000 025 876 0.282 370 5.1 0.9 1.24 1.43 0.11 5.1 5 0.132 882 0.004 408 0.282 511 0.000 028 830 0.282 442 6.7 1.0 1.15 1.30 0.12 6.1 6 0.083 596 0.002 901 0.282 535 0.000 021 830 0.282 490 8.3 0.8 1.07 1.19 0.10 7.1 7* 0.072 873 0.002 501 0.282 622 0.000 023 872 0.282 581 12.5 0.8 0.93 0.96 0.11 8.1 8* 0.129 814 0.004 245 0.282 662 0.000 031 869 0.282 592 12.9 1.1 0.92 0.94 0.14 11.1 9 0.110 374 0.003 664 0.282 486 0.000 027 830 0.282 429 6.2 0.9 1.17 1.33 0.12 12.1 10 0.094 232 0.003 226 0.282 432 0.000 027 830 0.282 382 4.5 1.0 1.23 1.43 0.12 10.1 11 0.147 145 0.004 766 0.282 471 0.000 028 830 0.282 397 5.1 1.0 1.23 1.40 0.13 13.1 12 0.081 860 0.002 855 0.282 401 0.000 032 830 0.282 356 3.6 1.1 1.27 1.49 0.14 16.1 13 0.091 848 0.003 069 0.282 489 0.000 024 830 0.282 441 6.6 0.9 1.14 1.30 0.11 15.1 14 0.106 146 0.003 382 0.282 407 0.000 029 830 0.282 354 3.5 1.0 1.28 1.49 0.13 18.1 15 0.108 108 0.003 411 0.282 492 0.000 032 830 0.282 439 6.5 1.1 1.15 1.31 0.14 19.1 16* 0.104 312 0.003 471 0.282 131 0.000 031 1820 0.282 011 13.7 1.1 1.69 1.63 0.14 20.1 17 0.162 450 0.005 008 0.282 467 0.000 027 830 0.282 388 4.8 1.0 1.24 1.42 0.12 23.1 18* 0.048 154 0.001 542 0.281 934 0.000 027 1866 0.281 879 10.1 1.0 1.88 1.89 0.12 22.1 注：(176Hf/177Hf)i=(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)；εHf(t)=10 000×{[(176Hf/177Hf)S-(176Lu/177Hf)S×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(eλt-1)]-1}；TDM1=1/λ×ln{1+[(176Hf/177Hf)S-(176Hf/177Hf)DM]/[(176Lu/177Hf)S-(176Lu/177Hf)DM]}；TDM2=TDM1-(TDM1-t)×[(fCC-fS)/(fCC-fDM)]；f=(176Lu/177Hf)S/(176Lu/177Hf)CHUR-1；公式中下标S、CHUR、DM分别表示样品测量值、球粒陨石值、亏损地幔值, fCC, fS, fDM分别为平均地壳、样品和亏损地幔的fLu/Hf；(176Hf/177Hf)CHUR, 0=0.282 772, (176Lu/177Hf)CHUR=0.033 2(Blichert-Toft and Albarède, 1997);(176Hf/177Hf)DM=0.283 25, (176Lu/177Hf)DM=0.038 4, fDM=0.16( Griffin et al., 2000 ); fCC=-0.55(Griffin et al., 2002 ); λ=1.867×10-11a-1(Söderlund et al., 2004 ); t表示年龄，带上标“*”的分析点用单个锆石年龄计算，其余分析点用岩浆结晶年龄(830 Ma)计算.
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