Zircon U–Pb Dating and Geochemical Features of the Jiaozishan Granite in the South Margin of the North China Craton and Its Tectonic Implications
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摘要:
角子山岩基是秦岭造山带东端伏牛山余脉规模居第二位的燕山期侵入岩，其岩石成因模型有助于深入认识华北克拉通南缘伏牛山余脉早白垩世酸性岩浆的形成规律和深部构造演化。角子山花岗岩体LA−ICP−MS锆石U−Pb定年样品的30个测点中，18个有效锆石测点的U−Pb年龄集中于（129.5±1.4）Ma（1个）和（116.1±1.4）～（122.2±1.3）Ma（17个）两组，形成了锆石年龄谱，后者的加权平均年龄为（119.3±0.9）Ma。结合前人10个有效锆石测点的U−Pb年龄数据，27颗锆石的加权平均年龄为（118.2±1.2）Ma，代表了角子山花岗岩的形成时代。角子山花岗岩样品具有富Si和碱、贫Ca和Mg的特征，为高钾钙碱性系列岩石，属于准铝质–弱过铝质花岗岩。在微量元素蛛网图中，角子山花岗岩样品显示了Rb、Th及Zr、Hf的正异常和Sr、P、Ti的负异常。角子山花岗岩稀土总量为20.9×10−6～204×10−6，（La/Yb）N值为4.24～21.0，δEu值为0.53～0.78，稀土配分模式呈轻稀土富集（右倾平滑）和中、重稀土亏损（近水平）的特征。角子山花岗岩样品的LaN–（La/Yb）N投点显示了正相关关系，表明其成分变异受控于部分熔融作用。角子山花岗岩的部分熔融源残余相包括角闪石、斜长石和金红石，无石榴子石残余，表明它形成于正常厚度地壳，存在深度大致为40～50 km和小于30 km的两个部分熔融岩石源区。角子山花岗岩形成于秦岭早白垩世陆（板）内造山阶段，经历了岩浆/流体混合再活化作用，是~120 Ma区域岩石圈拆沉作用的产物。
Abstract:The Jiaozishan batholith was a Yanshanian intrusive rock with the second largest area in the stretching branch of the Funiu Mountains, eastern of the Qinling orogenic belts. Its petrogenetic model was significant to understand the regular pattern of the early Cretaceous acid magma and deep tectonic evolution in the stretching branch of the Funiu Mountains. Among the total 30 zircon spots from dating sample JZS07 by LA–ICP–MS dating method, the U–Pb isotopic results of 18 zircon spots were available, and they were divided into two groups with (129.5±1.4) Ma (1 spot) and (116.1±1.4)～(122.2±1.3) Ma (17 spots), which had formed the zircon age spectrum. The weighted mean age of the second group was (119.3±0.9) Ma. Combined with the previous zircon U–Pb age data of 10 available zircon spots, the weighted average age of 27 zircons was (118.2±1.2) Ma, which represented the formation age of the Jiaozishan granite. The samples of the Jiaozishan granite were characterized by higher SiO2 and alkali, and lower MgO and CaO, and compositional spots fell into high–K calc-alkaline series in the SiO2–K2O diagram. The positive anomalies of Rb, Th, Zr and Hf, and negative anomalies of Sr, P and Ti were shown in spider diagram. Their total REEs contents were from 20.9×10−6 to 204×10−6 with (La/Yb)N ratios of 4.24～21.0. They had shown the characteristics of LREE–enrichment, MREE and HREE depletion with Eu negative anomalies (δEu values were 0.53～0.78). In the LaN– (La/Yb)N diagram, the sample points of the Jiaozishan granite had shown a positive correlation, indicating that the compositional variation was controlled by partial melting of source rock. The residual phases of its partial melting source included mainly hornblende, plagioclase and rutile, and no garnet. The Jiaozishan granite was formed in the crust with normal thickness, and there are two partial melting sources with depths of roughly 40～50 km and less than 30 km, respectively. The Jiaozishan granite experienced magma/fluid mixing and reactivation, and its formation tectonic setting was intraplate orogenic environment. The Jiaozishan granite was one of the products of the lithosphere delamination in～120 Ma.
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图 2 伏牛山余脉角子山花岗岩地质简图（据河南省地质矿产开发局第一地质调查队，2005修改）
Figure 2.
表 1 豫南方城–泌阳–桐柏地区燕山期花岗岩锆石U−Pb年龄统计表
Table 1. The zircon U−Pb ages of Yanshanian granites in the Fangcheng−Biyang−Tongbai area, the southern Henan province
序号 构造单元 花岗岩
名称定年样品
编号样品岩性 定年方法 花岗岩形成
年龄 （Ma）文献 1 华北克拉
通南缘张士英 DSS1 钾长花岗岩 SHRIMP 107.3±2.4 向君峰等，2010 SG2 似斑状花岗岩 SHRIMP 106.7±2.5 向君峰等，2010 Mai4 石英斑岩脉 SHRIMP 101±3 向君峰等，2010 HF-30 角闪石英正长岩 LA-ICP-MS 124.2±0.5 李创举等，2010 ZSY-D-1 石英正长岩 LA-ICP-MS 122.8±1.5 段友强等，2015 ZSY-A-1 石英正长岩 LA-ICP-MS 122.8±1.5 Zhao et al.，2021 2 吴沟 WG02 斑状黑云母二长花岗岩 LA-ICP-MS 130.8±0.8 梁涛等，2021a 3 祖师顶 DB18-1 黑云母二长花岗岩 LA-ICP-MS 131.9±1.1 周红升等，2008 4 黄山 DB13-1 斑状黑云母二长花岗岩 LA-ICP-MS 132.8±0.8 周红升等，2008 5 角子山 DB16-1 斑状黑云母二长花岗岩 LA-ICP-MS 120.9±0.8 周红升等，2008 JZS07 粗粒黑云母正长花岗岩 LA-ICP-MS 119.3±0.9 本文 6 大纸房 DZF01 黑云母二长花岗岩 LA-ICP-MS 119.5±1.6 卢仁等，2023 7 嵖岈山 CYS01 粗粒黑云母正长花岗岩 LA-ICP-MS 116.8±1.3 卢仁等，2023 8 铜山 TSH01 中粒黑云母二长花岗岩 LA-ICP-MS 130.6±1.8 梁涛等，2021b 9 天目山 TMS03 黑云母正长花岗岩 LA-ICP-MS 129.2±1.7 卢仁等，2020 10 北秦岭
构造带梁湾 YDP9 花岗闪长岩 SHRIMP 132.5±2.3 江思宏等，2009 YDP10 二长花岗岩 SHRIMP 137.0±3.4 江思宏等，2009 11 老寨山 TMS-2 黑云母二长花岗岩 LA-ICP-MS 123.0±0.8 Yang et al., 2017 12 桐柏–大别
造山带老湾 LW07-1 黑云母二长花岗岩 SHRIMP 132.5±2.4 刘翼飞等，2008 13 三合店 05DB36-1 斑状角闪黑云二长花岗岩 LA-ICP-MS 133.1±0.5 Zhang et al., 2013 14 鸡公山 05DB31-1 斑状角闪黑云二长花岗岩 LA-ICP-MS 136.8±0.6 Zhang et al., 2013 05DB10-1 黑云母正长花岗岩 LA-ICP-MS 125.4±1.0 Zhang et al., 2013 11TB42 花岗岩 LA-ICP-MS 133.4±1.4 Zhang et al., 2018 12TB43 花岗岩 SIMS 135.2±2.4 Zhang et al., 2018 
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表 2 伏牛山余脉角子山花岗岩样品JZS07锆石LA–ICP–MS定年结果表
Table 2. Zircon LA-ICP-MS dating results of sample JZS07 from the Jiaozishan granite in the stretching branch of the Funiu mountains
测点 元素含量 （10−6） Th/U 同位素比值 同位素年龄 （Ma） 谐和度（%） Pb Th U n（207Pb）/n（206Pb） n（207Pb）/n（235U） n（206Pb）/n（238U） n（207Pb）/n（206Pb） n（207Pb）/n（235U） n（206Pb）/n（238U） 测值 1σ 测值 1σ 测值 1σ 测值 1σ 测值 1σ 测值 1σ -01 24.8 922 842 1.09 0.15465 0.00343 0.35028 0.00477 0.01643 0.00018 2398.0 37.3 304.9 3.6 105.0 1.2 2 -02 17.9 435 776 0.56 0.04776 0.00109 0.12324 0.00184 0.01871 0.00020 86.4 54.4 118.0 1.7 119.5 1.3 99 -03 9.16 222 394 0.56 0.04836 0.00126 0.12555 0.00240 0.01883 0.00021 116.9 60.1 120.1 2.2 120.2 1.3 100 -04 6.96 220 277 0.79 0.05316 0.00160 0.13323 0.00323 0.01818 0.00021 335.6 66.9 127.0 2.9 116.1 1.4 91 -05 11.1 297 463 0.64 0.05540 0.00130 0.14370 0.00226 0.01881 0.00021 428.2 51.1 136.3 2.0 120.1 1.3 87 -06 14.5 460 619 0.74 0.04958 0.00116 0.12455 0.00193 0.01822 0.00020 175.1 53.5 119.2 1.7 116.4 1.3 98 -07 14.0 398 592 0.67 0.04829 0.00113 0.12321 0.00193 0.01850 0.00020 113.7 54.5 118.0 1.7 118.2 1.3 100 -08 24.1 472 763 0.62 0.12487 0.00270 0.35696 0.00455 0.02073 0.00023 2026.9 37.9 309.9 3.4 132.3 1.4 20 -09 48.5 644 1323 0.49 0.20440 0.00429 0.58329 0.00679 0.02069 0.00022 2861.7 33.8 466.6 4.4 132.0 1.4 -12 -10 39.7 878 1357 0.65 0.10604 0.00224 0.29292 0.00350 0.02003 0.00022 1732.4 38.3 260.9 2.8 127.9 1.4 32 -11 26.4 772 1098 0.70 0.05011 0.00113 0.13073 0.00186 0.01892 0.00021 200.1 51.6 124.8 1.7 120.8 1.3 97 -12 29.6 558 1208 0.46 0.09529 0.00205 0.23390 0.00293 0.01780 0.00019 1533.8 40.0 213.4 2.4 113.7 1.2 39 -13 8.03 239 331 0.72 0.05118 0.00148 0.13149 0.00299 0.01863 0.00022 248.9 65.4 125.4 2.7 119.0 1.4 95 -14 42.4 1020 1683 0.61 0.04907 0.00110 0.13727 0.00191 0.02029 0.00022 151.1 51.7 130.6 1.7 129.5 1.4 99 -15 17.9 600 702 0.85 0.07296 0.00163 0.18275 0.00251 0.01816 0.00020 1012.9 44.3 170.4 2.2 116.0 1.3 62 -16 9.01 246 346 0.71 0.05513 0.00138 0.15223 0.00270 0.02002 0.00022 417.4 54.5 143.9 2.4 127.8 1.4 88 -17 30.6 740 1315 0.56 0.05139 0.00116 0.13394 0.00188 0.01890 0.00020 258.2 51.0 127.6 1.7 120.7 1.3 94 -18 38.0 799 1675 0.48 0.04843 0.00109 0.12605 0.00175 0.01888 0.00020 120.2 52.0 120.5 1.6 120.5 1.3 100 -19 20.0 567 693 0.82 0.10297 0.00225 0.27284 0.00350 0.01922 0.00021 1678.3 39.8 245.0 2.8 122.7 1.3 33 -20 14.7 366 617 0.59 0.04828 0.00113 0.12744 0.00195 0.01914 0.00021 113.2 54.4 121.8 1.8 122.2 1.3 100 -21 47.8 783 1689 0.46 0.11842 0.00252 0.32014 0.00378 0.01961 0.00021 1932.5 37.6 282.0 2.9 125.2 1.3 23 -22 10.1 414 381 1.09 0.05120 0.00129 0.13421 0.00238 0.01901 0.00021 250.0 56.9 127.9 2.1 121.4 1.3 95 -23 23.7 618 1031 0.60 0.05237 0.00119 0.13209 0.00188 0.01829 0.00020 301.5 50.9 126.0 1.7 116.9 1.3 93 -24 16.6 569 635 0.89 0.07150 0.00162 0.18181 0.00255 0.01844 0.00020 971.9 45.5 169.6 2.2 117.8 1.3 64 -25 15.9 483 655 0.74 0.05029 0.00117 0.12904 0.00195 0.01861 0.00020 208.6 53.3 123.2 1.8 118.8 1.3 96 -26 12.7 432 771 0.56 0.06748 0.00157 0.10861 0.00162 0.01167 0.00013 852.5 47.6 104.7 1.5 74.8 0.8 67 -27 19.7 654 766 0.85 0.05212 0.00122 0.13516 0.00205 0.01881 0.00020 290.5 52.6 128.7 1.8 120.1 1.3 93 -28 26.4 1551 928 1.67 0.04808 0.00115 0.12456 0.00197 0.01879 0.00020 103.2 55.5 119.2 1.8 120.0 1.3 99 -29 35.1 736 1574 0.47 0.04998 0.00110 0.12732 0.00166 0.01847 0.00020 194.1 50.5 121.7 1.5 118.0 1.3 97 -30 12.2 299 517 0.58 0.05098 0.00121 0.13214 0.00206 0.01880 0.00020 240.1 53.8 126.0 1.9 120.0 1.3 95
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表 3 伏牛山余脉角子山花岗岩主量元素（%）和微量元素（10−6）分析结果表
Table 3. Major (%) and trace (10−6) elements analysis results of the Jiaozishan granite in the stretching branch of the Funiu mountains
样品编号 JZS01 JZS03 JZS04 JZS05 JZS06 JZS07 JZS08 JZS09 岩性 黑云母正长花岗岩 SiO2 76.82 77.19 74.76 77.66 74.77 73.30 76.39 74.83 TiO2 0.08 0.05 0.21 0.05 0.13 0.20 0.12 0.18 Al2O3 12.68 12.83 12.92 12.42 13.06 13.48 12.74 13.16 TFe2O3 1.16 0.92 1.96 0.83 1.68 2.05 1.20 1.71 MnO 0.02 0.01 0.05 0.01 0.04 0.05 0.02 0.07 MgO 0.12 0.03 0.42 0.04 0.23 0.47 0.16 0.22 CaO 0.66 0.51 1.31 0.43 0.83 1.44 0.66 0.80 Na2O 3.84 4.27 3.47 4.10 3.49 3.80 3.51 3.91 K2O 4.59 4.17 4.52 4.02 4.97 4.98 4.86 5.10 P2O5 0.03 0.01 0.09 0.01 0.04 0.08 0.03 0.05 烧失量 0.54 0.54 0.42 0.61 0.77 0.42 0.82 0.42 总量 100.54 100.53 100.12 100.18 100.02 100.28 100.51 100.46 Na2O+K2O 8.43 8.44 7.99 8.12 8.46 8.78 8.37 9.01 Na2O/K2O 0.84 1.02 0.77 1.02 0.70 0.76 0.72 0.77 A/CNK 1.01 1.03 0.99 1.04 1.03 0.94 1.04 0.98 A/NK 1.12 1.11 1.22 1.12 1.17 1.16 1.15 1.10 Ga 19.6 21.6 16.6 20.4 18.7 18.2 19.0 21.6 Ba 104 22.8 386 17.3 238 492 333 483 Rb 323 357 161 325 284 242 320 330 Th 38.5 48.6 27.0 31.3 29.3 27.8 43.7 57.3 U 6.67 5.68 2.52 3.33 2.21 25.3 4.39 15.3 Sr 49.0 26.4 231 22.7 109 234 105 129 Zr 110 73.0 127 68.0 100 105 139 203 Hf 4.6 3.6 3.7 4.2 4.7 3.6 4.9 7.0 Nb 20.1 17.2 14.9 26.4 23.2 19.3 30.4 52.2 Ta 1.7 1.3 1.3 2.3 2.2 1.6 2.6 4.4 Y 6.6 3.8 11.3 3.8 9.6 10.2 9.1 18.5 La 20.9 21.1 39.0 6.6 28.8 33.0 32.9 60.4 Ce 32.8 28.4 62.1 8.1 48.1 53.7 56.8 95.7 Pr 2.90 2.08 5.89 0.82 4.14 5.12 4.97 8.75 Nd 8.4 4.9 18.8 2.1 12.7 16.3 14.2 25.0
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续表3 样品编号 JZS01 JZS03 JZS04 JZS05 JZS06 JZS07 JZS08 JZS09 岩性 黑云母正长花岗岩 Sm 1.31 0.60 3.05 0.64 1.96 2.62 1.87 3.45 Eu 0.20 0.10 0.65 0.11 0.40 0.58 0.37 0.53 Gd 0.88 0.45 2.00 0.26 1.28 1.76 1.29 2.44 Tb 0.14 0.07 0.31 0.05 0.21 0.27 0.22 0.41 Dy 0.85 0.39 1.75 0.37 1.23 1.51 1.30 2.50 Ho 0.18 0.10 0.35 0.09 0.26 0.30 0.26 0.52 Er 0.64 0.39 1.02 0.41 0.92 0.95 1.00 1.84 Tm 0.12 0.09 0.16 0.10 0.15 0.15 0.19 0.33 Yb 1.06 0.77 1.25 1.05 1.37 1.22 1.46 2.47 Lu 0.21 0.18 0.20 0.24 0.27 0.22 0.26 0.45 ΣREE 70.6 59.6 137 20.9 102 118 117 205 （La/Yb）N 13.3 18.5 21.0 4.24 14.2 18.2 15.2 16.5 δEu 0.54 0.57 0.76 0.70 0.73 0.78 0.69 0.53 Nb/Ta 11.8 13.2 11.5 11.5 10.5 12.1 11.7 11.9 Zr/Hf 23.9 20.3 34.3 16.2 21.3 29.2 28.4 29.0 Th/U 5.77 8.56 10.7 9.40 13.3 1.10 9.95 3.76 Rb/Sr 6.59 13.5 0.70 14.3 2.61 1.03 3.06 2.56 Y/Nb 0.33 0.22 0.76 0.14 0.41 0.53 0.30 0.35 Rb/Ba 3.11 15.66 0.42 18.79 1.19 0.49 0.96 0.68 tZr（℃） 757 725 765 722 749 741 779 803 注：δEu计算公式为：δEu= 
EuN/（SmN+GdN）；全岩Zr饱和温度tZr计算方法据Watson et al.（1983）。
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