Geochronology and Geochemistry of Mesozoic Mafic Intrusive Rocks in Zhongtiao Mountain Area: Characterizing Lithospheric Mantle of Southern North China Craton
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摘要: 镁铁质岩石作为幔源岩浆产物，其成因研究有助于探讨华北克拉通深部地幔性质及其演化过程.对中条山地区镁铁质侵入岩开展了系统的锆石U-Pb年代学、全岩主、微量元素、全岩Sr-Nd同位素和锆石Hf同位素研究，揭示了晚三叠世（217±2 Ma）和早白垩世（121±2 Ma）两期镁铁质岩浆活动.晚三叠世镁铁质侵入岩SiO2含量低至中等（46.03%~53.87%），MgO（14.37%~18.61 %）、Ni（282×10-6~433×10-6）、Cr（619×10-6~1 847×10-6）异常富集，亲岩浆元素丰度较低，上凸型稀土配分模式发育显著，指示岩体为堆晶成因.大量原生角闪石的发育表明晚三叠世杂岩的母岩浆高度富水，所有样品具有近平行的微量元素配分模式指示其轻度分异的LILE-HFSE（大离子亲石元素-高场强元素）组成反映地幔源区固有属性，母岩浆可能起源于经大洋板片沉积物熔/流体交代的地幔楔部分熔融.早白垩世镁铁质侵入岩SiO2含量介于49.23%~54.99%，MgO和Fe2O3T含量分别为4.29%~7.17%和9.70%~14.79%，大离子亲石元素（Rb、Ba、K、Pb）和轻稀土元素富集，高场强元素（Nb、Ta、Zr、Hf、Ti）和重稀土元素亏损，可能为经俯冲陆壳衍生熔体交代的岩石圈地幔部分熔融形成.晚三叠世杂岩可能响应于扬子板块与华北克拉通碰撞引起的造山后岩石圈拆沉，早白垩世侵入岩则可能与古太平洋板块西向俯冲后回撤所引起的弧后岩石圈伸展有关.此外，二者均具有相对典型克拉通富集地幔亏损的全岩Nd（εNd（t）=-18.56~-12.64）和锆石Hf（εHf（t）=-20.2~+10.4），指示华北克拉通中南部岩石圈地幔性质自晚三叠世以来发生了显著改变，早白垩世克拉通破坏可能延及华北中部.Abstract: The mafic rocks originating from deep earth are probes for lithospheric mantle evolution. In this paper, it presents a synthesis study of zircon U-Pb chronology, whole-rock elemental and Sr-Nd isotopic geochemistry, and zircon Hf isotope of the mafic intrusive rocks in the Zhongtiao Mountain area. Two periods of magmatism during the Late Triassic (217±2 Ma) and the Early Cretaceous (121±2 Ma) are unraveled. The Late Triassic samples are characterized by low to intermediate SiO2 contents (46.03%-53.87%), high MgO (14.37%-18.61%), Ni (282×10-6-433×10-6) and Cr (619×10-6-1 847×10-6) concentrations, low magmatophile element abundances, and convex rare earth element distribution patterns, indicating a cumulate origin. The existence of a large number of original amphiboles indicates that the parental magma is highly water-rich. All samples have nearly parallel trace element distribution patterns, which implies that their mild LILE-HFSE (large ion lithophile element - high field strength element) differentiation reflects the inherent attributes of mantle source region, and their parental magma probably originated from partial melting of the mantle wedge metasomatized by subducted sediment melt/fluid. The SiO2 content of Early Cretaceous mafic intrusive rocks lies between 49.23%-54.99%, while the contents of MgO and Fe2O3T are 4.29%-7.17% and 9.70%-14.79%, respectively. Meanwhile, these rocks are enriched in LILEs and light rare earth elements (LREEs), and depleted in HFSEs and heavy rare earth elements (HREEs). Their formation is ascribed to partial melting of lithospheric mantle metasomatized by subducted continental crust-derived melt. The Late Triassic complex may be related to post-orogenic oceanic slab breakoff caused by collision between the Yangtze plate and the North China craton (NCC), while the Early Cretaceous intrusive rocks may be linked with back arc lithospheric extension triggered by the retreat of Paleo-Pacific plate during its westward subduction. In addition, the relative depletion of whole-rock Nd (εNd(t)=-18.56 to -12.64) and zircon Hf (εHf(t)=-20.2 to +10.4) isotopic compositions in samples compared with that of typical craton lithospheric mantle indicates that the lithospheric mantle nature of the central and southern part of the NCC have changed significantly since the Late Triassic, and the Early Cretaceous craton destruction extends to the central part of the NCC.
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图 1 华北克拉通中生代镁铁质岩浆岩分布
图中数字表示年龄，单位为Ma；五角星代表洋岛型岩浆岩，圆形代表岛弧型岩浆岩.数据引自Guo et al.（2014），Ma et al.（2014），Hong et al.（2017），Deng et al.（2017），郑永飞等（2018），Yang et al.（2019），Li et al.（2020），Liu et al.（2020），Quan et al.（2020）及Zhao et al.（2020）
Fig. 1. The distribution of Mesozoic mafic magmatic rocks in the North China craton
图 2 华北克拉通基底构造单元划分（根据Zhao et al., 2000修改）及研究区位置(a)；中条山地区地质简图采样位置(b)
Fig. 2. Division of basement tectonic units in the North China craton and the location of study area (a); geological sketch map of the Zhongtiao Mountain area and sampling locations (b)
图 3 中条山镁铁质岩石野外照片
a.晚三叠世基性岩与围岩接触关系；b.早白垩世辉长岩；c.早白垩世细粒辉长岩；d.早白垩世粗粒辉长岩；e.早白垩世辉绿岩
Fig. 3. Field photographs of mafic rocks in the Zhongtiao Mountain area
图 4 中条山镁铁质侵入岩显微照片
a~c.为晚三叠世侵入岩；d~f.为早白垩世侵入岩.图a为单偏光照片，图（b~f）为正交偏光照片.Amp.角闪石；Pl.斜长石；Py.辉石
Fig. 4. Microphotographs of mafic rocks from the Zhongtiao Mountain area
图 5 中条山镁铁质岩石锆石阴极发光图像
Fig. 5. CL images of zircons from the mafic rocks of Zhongtiao Mountain area
图 6 中条山镁铁质岩石锆石U-Pb年龄谐和图
Fig. 6. Zircon U-Pb concordia diagrams of mafic rocks in the Zhongtiao Mountain area
图 7 中条山镁铁质岩石元素地球化学特征
a.TAS分类图解（据Middlemost，1994）；b.SiO2-K2O图解（据Peccerillo and Taylor, 1976）；c.原始地幔标准化微量元素蛛网图（据Sun and McDonough, 1989）；d.球粒陨石标准化稀土元素配分曲线（据Sun and McDonough, 1989）
Fig. 7. Elemental geochemical characteristics of mafic rocks in the Zhongtiao Mountain area
图 8 中条山镁铁质岩石(87Sr/86Sr)i-εNd(t)图解（a）与锆石εHf(t)-U-Pb年龄图解（b）
图a底图据Yang et al.（2019）和汤艳杰等（2021）修改；图b中华北克拉通东陆块中-新生代镁铁质岩的数据引自Liu et al.（2020）；T-J.三叠纪-侏罗纪；K1.早白垩世；K2-Cz.晚白垩世-新生代
Fig. 8. (87Sr/86Sr)i vs. εNd(t) (a) and zircon εHf(t) vs. U-Pb age (b) diagrams of mafic rocks in the Zhongtiao Mountain area
图 10 中条山镁铁质岩石Sr-(87Sr/86Sr)i图解
揭示了俯冲陆壳与再循环沉积物在富集地幔源区形成过程中的作用，模拟使用的参数见附表2
Fig. 10. Sr vs. (87Sr/86Sr)i plot of mafic rocks in the Zhongtiao Mountain area
图 11 中条山早白垩世镁铁质岩石SiO2-Th/La图解(a)；SiO2-U/Nb图解(b)；SiO2-Nb/Ta图解(c)；SiO2-Lu/Yb图解（d）；SiO2-εNd(t)图解(e)；La-La/Sm图解（f）
图c据Weyer et al., 2002；图d据Sun and McDonough（1989）
Fig. 11. Diagrams of SiO2 vs. Th/La (a), SiO2 vs. U/Nb (b), SiO2 vs. Nb/Ta (c), SiO2 vs. Lu/Yb (d), SiO2 vs. εNd(t) (e) and La vs. La/Sm (f) for the Early Cretaceous mafic rocks in the Zhongtiao Mountain area
图 12 中条山早白垩世镁铁质岩石Nb/Yb-Th/Yb图解（a），Nb-Nb/U图解（b），Nb/Y-Rb/Y图解(c)，Th-Ba/Th图解（d）
图a据Liu et al., 2020；图b据Ayers，1998和Hofmann et al., 1986；图c据Zhao et al., 2020；图d据Zhao et al., 2020. SMLM.俯冲交代岩石圈地幔；SMAM.俯冲交代软流圈地幔；OIB.洋岛玄武岩；N-MORB.正常洋中脊玄武岩；E-MORB.富集洋中脊玄武岩
Fig. 12. Diagrams of Nb/Yb vs. Th/Yb (a), Nb vs. Nb/U (b), Nb/Y vs. Rb/Y (c) and Th vs. Ba/Th (d) for the Early Cretaceous mafic rocks of Zhongtiao Mountain area
图 13 中条山早白垩世镁铁质岩石K/Yb×1 000-Dy/Yb图解（据Duggen et al., 2005）
Fig. 13. K/Yb×1 000 vs. Dy/Yb plot of the Early Cretaceous mafic rocks in the Zhongtiao Mountain area
图 14 华北克拉通南缘中生代构造演化过程示意图
据Yang et al.（2007a）；郑永飞等（2018）修改
Fig. 14. Schematic cartoons illustrating the Mesozoic tectonic evolution of the southern margin of the North China craton
表 1 华北克拉通中条山地区镁铁质岩石锆石U-Pb同位素年代学测试结果
Table 1. Zircon U-Pb isotopic data and ages of mafic rocks from Zhongtiao Mountain area, North China craton
分析点 Th U Th/U Pb 同位素比值 年龄(Ma) No. (10-6) (10-6) (10-6) 207Pb/206Pb 1σ (%) 207Pb/235U 1σ (%) 206Pb/238U 1σ (%) 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ XX14-7-1@3 473 400 1.18 11 0.048 80 1.64 0.125 49 2.24 0.018 7 1.53 138.1 38.0 120.0 2.5 119.1 1.8 XX14-7-1@4 783 693 1.13 18 0.054 56 14.85 0.140 66 14.94 0.018 7 1.66 394.2 302.5 133.6 18.9 119.4 2.0 XX14-7-1@5 854 701 1.22 19 0.047 63 1.71 0.124 42 2.28 0.018 9 1.50 81.1 40.1 119.1 2.6 121.0 1.8 XX14-7-1@1 3 620 1 434 2.52 51 0.049 20 0.92 0.128 85 1.76 0.019 0 1.50 157.3 21.4 123.1 2.0 121.3 1.8 XX14-7-1@2 383 386 0.99 10 0.048 57 1.64 0.129 11 2.22 0.019 3 1.51 127.3 38.0 123.3 2.6 123.1 1.8 XX14-7-1@7 9 634 21 605 0.45 1 159 0.051 85 1.60 0.333 74 2.20 0.046 7 1.51 278.9 36.3 292.4 5.6 294.1 4.3 XX14-7-1@6 3 973 3 167 1.25 259 0.065 99 9.69 0.533 90 9.82 0.058 7 1.60 806.2 190.7 434.4 35.3 367.6 5.7 WX15-1-1@08 192 323 0.59 6 0.039 51 27.70 0.092 86 27.74 0.017 0 1.50 -382.8 598.8 90.2 24.2 109.0 1.6 WX15-1-1@02 165 224 0.74 5 0.049 01 24.10 0.120 27 24.22 0.017 8 2.35 148.1 484.7 115.3 26.8 113.7 2.7 WX15-1-1@03 112 203 0.55 5 0.045 31 16.37 0.115 58 16.47 0.018 5 1.83 -38.8 356.0 111.1 17.5 118.2 2.1 WX15-1-1@11 143 246 0.58 6 0.047 96 6.10 0.125 09 6.39 0.018 9 1.89 97.1 138.4 119.7 7.2 120.8 2.3 WX15-1-1@14 53 115 0.46 3 0.047 83 4.84 0.127 10 5.10 0.019 3 1.62 90.9 110.8 121.5 5.9 123.1 2.0 WX15-1-1@10 584 716 0.82 18 0.046 84 3.05 0.124 50 3.44 0.019 3 1.58 40.9 71.5 119.1 3.9 123.1 1.9 WX15-1-1@13 738 961 0.77 25 0.047 78 1.47 0.132 40 2.23 0.020 1 1.68 88.3 34.4 126.3 2.7 128.3 2.1 WX15-1-1@07 215 244 0.88 9 0.050 16 2.39 0.190 80 2.91 0.027 6 1.66 202.4 54.7 177.3 4.7 175.4 2.9 WX15-1-1@12 419 986 0.43 44 0.052 28 1.28 0.273 62 2.60 0.038 0 2.27 297.8 28.9 245.6 5.7 240.2 5.3 WX15-1-1@06 421 1 242 0.34 57 0.051 15 0.88 0.278 30 2.29 0.039 5 2.12 247.7 20.1 249.3 5.1 249.5 5.2 WX15-1-1@1 619 948 0.65 47 0.051 57 0.97 0.282 57 2.19 0.039 7 1.97 266.2 22.1 252.7 4.9 251.2 4.8 WX15-1-1@05 207 339 0.61 17 0.051 65 1.17 0.294 16 2.03 0.041 3 1.66 270.1 26.7 261.8 4.7 260.9 4.2 WX15-1-1@15 382 504 0.76 45 0.055 54 0.62 0.526 21 1.63 0.068 7 1.51 434.0 13.7 429.3 5.7 428.4 6.3 WX15-1-1@17 116 718 0.16 120 0.069 20 0.34 1.420 72 1.63 0.148 9 1.59 904.6 6.9 897.7 9.7 894.8 13.3 WX15-1-1@09 28 39 0.72 8 0.069 59 4.47 1.538 74 4.97 0.160 4 2.18 916.3 89.2 946.0 31.1 958.8 19.5 WX15-1-1@16 290 421 0.69 154 0.103 84 0.25 4.016 38 1.56 0.280 5 1.54 1 693.9 4.6 1 637.5 12.8 1 593.9 21.8 WX15-1-1@04 162 413 0.39 207 0.136 29 0.23 7.553 82 1.58 0.402 0 1.56 2 180.6 4.1 2 179.4 14.3 2 178.1 29.0 XX14-2-1@4 123 398 0.31 16 0.049 02 4.57 0.236 81 4.81 0.035 0 1.50 148.6 103.8 215.8 9.4 222.0 3.3 XX14-2-1@16 280 751 0.37 29 0.049 07 4.45 0.224 64 4.70 0.033 2 1.50 151.1 101.1 205.8 8.8 210.6 3.1 XX14-2-1@5 663 1 151 0.58 48 0.050 22 0.90 0.237 18 1.75 0.034 3 1.50 205.4 20.7 216.1 3.4 217.1 3.2 XX14-2-1@12 211 478 0.44 19 0.050 23 1.79 0.232 39 2.34 0.033 6 1.51 205.7 40.9 212.2 4.5 212.7 3.2 XX14-2-1@9 174 400 0.44 16 0.050 62 1.85 0.238 43 2.40 0.034 2 1.52 223.4 42.2 217.1 4.7 216.6 3.2 XX14-2-1@6 297 732 0.41 30 0.050 76 1.12 0.240 77 1.87 0.034 4 1.51 230.0 25.6 219.0 3.7 218.0 3.2 XX14-2-1@14 528 1 082 0.49 44 0.050 97 1.66 0.239 97 2.24 0.034 1 1.50 239.3 37.8 218.4 4.4 216.5 3.2 XX14-2-1@13 424 1 025 0.41 42 0.050 99 1.34 0.245 63 2.02 0.034 9 1.50 240.4 30.7 223.0 4.0 221.4 3.3 XX14-2-1@2 218 736 0.30 213 0.090 27 0.32 3.055 31 1.54 0.245 5 1.50 1 431.3 6.2 1 421.6 11.8 1 415.0 19.1 XX14-2-1@3 21 691 0.03 234 0.117 20 0.37 4.885 07 1.55 0.302 3 1.50 1 914.0 6.6 1 799.7 13.1 1 702.7 22.5 XX14-2-1@1 48 347 83 766 0.58 32 946 0.117 64 15.04 5.697 18 15.20 0.351 2 2.20 1 920.7 247.6 1 930.9 140.5 1 940.5 36.9 XX14-2-1@11 3 361 3 007 1.12 885 0.119 50 0.22 3.434 59 1.52 0.208 4 1.50 1 948.8 4.0 1 512.3 12.0 1 220.5 16.8 XX14-2-1@10 534 389 1.37 239 0.145 02 0.56 7.986 34 1.60 0.399 4 1.50 2 288.0 9.7 2 229.5 14.6 2 166.4 27.7 XX14-2-1@8 327 589 0.56 336 0.158 45 0.40 9.494 85 1.55 0.434 6 1.50 2 439.2 6.8 2 387.0 14.4 2 326.4 29.4 
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表 2 华北克拉通中条山地区晚三叠世镁铁质岩石中角闪石电子探针成分（%）
Table 2. Electron microprobe analyses of amphibole in Late Triassic mafic rocks from Zhongtiao Mountain area, North China craton (%)
样品号 XX14-2-1 XX14-2-1 矿物编号 AM1 AM2 AM3 AM4 AM5 AM6 AM7 AM8 AM9 AM10 AM11 AM12 AM13 AM14 SiO2 53.77 53.94 54.07 54.10 53.90 54.51 54.35 54.48 53.29 54.07 53.54 53.95 54.24 53.91 TiO2 0.19 0.16 0.14 0.19 0.14 0.10 0.14 0.20 0.15 0.13 0.15 0.14 0.09 0.13 Al2O3 3.3 3.30 3.14 3.17 2.98 2.74 3.16 3.07 3.01 2.93 3.13 2.95 3.02 3.15 FeO 8.32 8.19 7.95 8.24 8.05 7.91 8.20 8.31 8.16 8.11 8.25 8.16 7.96 8.40 MnO 0.21 0.25 0.24 0.23 0.24 0.25 0.24 0.28 0.24 0.27 0.21 0.23 0.24 0.28 MgO 18.73 18.31 18.76 18.49 18.42 18.96 18.83 18.80 18.35 18.50 18.83 18.87 18.75 18.62 CaO 11.65 11.59 11.45 11.51 11.83 11.94 11.76 11.41 11.80 11.72 11.44 11.37 11.82 11.54 Na2O 0.77 0.67 0.59 0.62 0.55 0.48 0.61 0.64 0.58 0.62 0.72 0.61 0.55 0.65 K2O 0.15 0.13 0.11 0.14 0.10 0.08 0.11 0.13 0.13 0.09 0.13 0.12 0.15 0.12 Cr2O3 0.24 0.30 0.17 0.21 0.13 0.16 0.17 0.17 0.18 0.21 0.23 0.09 0.13 0.10 NiO 0.04 0.04 0.02 0.04 0 0.01 0.05 0.05 0.08 0.04 0.05 0.01 0.06 0.08 Total 97.37 96.88 96.64 96.94 96.26 97.14 97.62 97.54 95.97 96.69 96.68 96.5 97.01 96.98 T Si 7.575 7.621 7.633 7.636 7.639 7.668 7.631 7.651 7.585 7.643 7.576 7.626 7.643 7.609 Al 0.412 0.365 0.358 0.351 0.353 0.320 0.356 0.334 0.410 0.347 0.417 0.368 0.345 0.384 Ti 0.021 0.017 0.015 0.020 0.015 0.010 0.015 0.021 0.014 0.014 0.016 0.015 0.010 0.013 C Al 0.135 0.184 0.164 0.176 0.133 0.134 0.166 0.174 0.095 0.142 0.104 0.124 0.156 0.140 Cr 0.026 0.034 0.019 0.023 0.015 0.018 0.019 0.018 0.020 0.023 0.025 0.010 0.015 0.011 Fe3+ 0.249 0.215 0.252 0.229 0.224 0.229 0.239 0.265 0.246 0.234 0.276 0.282 0.229 0.285 Mg 3.930 3.851 3.940 3.883 3.893 3.976 3.941 3.927 3.892 3.899 3.953 3.964 3.940 3.913 Fe2+ 0.691 0.741 0.646 0.714 0.737 0.679 0.680 0.652 0.736 0.721 0.654 0.632 0.690 0.668 Mn2+ 0.003 0.009 0.005 0.005 0.006 0.007 0.006 0.008 0.006 0.010 0.002 0.002 0.006 0.009 B Ca 1.766 1.761 1.738 1.748 1.807 1.808 1.775 1.721 1.811 1.784 1.743 1.731 1.793 1.753 Na 0.152 0.189 0.172 0.181 0.176 0.143 0.148 0.170 0.163 0.181 0.153 0.164 0.163 0.163 A Na 0.058 0.000 0.000 0.000 0.000 0.000 0.019 0.005 0.000 0.000 0.045 0.003 0.000 0.014 K 0.018 0.014 0.010 0.016 0.009 0.003 0.009 0.013 0.017 0.007 0.016 0.013 0.017 0.013 Mg# 0.80 0.80 0.81 0.80 0.80 0.81 0.80 0.80 0.80 0.80 0.80 0.80 0.81 0.80 注：离子数计算结果据 Li et al., 2020 . 标准的角闪石晶体化学通式为: A0~1 B2 C5Ⅵ T8Ⅳ O2 2(OH, F, Cl)，其中，A为Na+、K+、Ca2+、(H3O)+; B为Na+、Li+、K+、Ca2+、Mg2+、Fe2+、Mn2+; C为Mg2+、Fe2+、Mn2+、Al3+、Fe3+、Ti4+、Cr3+; T为Si4+、Al3+、Fe3+、Ti4+、Cr3+，式中上角注的罗马数字表示配位数, 下角注的阿拉伯数码表示原子数.
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表 3 华北克拉通中条山地区晚三叠世镁铁质岩石中角闪石微量元素（10-6）分析结果（样品号：XX19-8-1）
Table 3. Trace element compositions (10-6) of amphibole in Late Triassic mafic rocks from Zhongtiao Mountain area, North China craton(Sample No. XX19-8-1)
编号 AM1 AM2 AM3 AM4 AM5 AM6 AM7 编号 AM1 AM2 AM3 AM4 AM5 AM6 AM7 Li 1.85 2.17 2.40 3.01 2.15 2.46 2.79 Ba 44.0 17.2 20.7 16.6 16.5 21.4 13.0 Mg 94 154 97 799 98 882 96 189 98 952 97 722 98 456 La 1.58 1.20 1.67 1.01 1.22 1.07 1.06 P 13.80 12.40 11.80 24.00 15.10 14.60 2.96 Ce 7.05 5.73 6.90 5.36 5.77 4.94 5.39 Ca 91 361 91 205 91 887 90 125 91 444 92 002 91 146 Pr 1.29 1.10 1.22 1.07 1.10 0.95 1.06 Sc 47.9 43.6 44.0 46.5 46.0 43.1 43.6 Nd 7.73 6.35 6.95 6.53 6.68 6.18 6.29 Ti 2 259 1 776 1 778 1 913 1 740 2 106 1 694 Sm 2.31 1.81 1.94 1.91 1.90 1.96 1.94 V 164 144 139 157 147 154 145 Eu 0.65 0.48 0.52 0.51 0.50 0.56 0.51 Cr 463 116 1 003 482 707 251 452 Gd 2.08 1.68 1.70 1.78 1.75 1.88 1.78 Mn 1 713 1 820 1 807 1 817 1 774 1 772 1 806 Tb 0.29 0.22 0.23 0.23 0.24 0.26 0.21 Fe 60 218 56 742 56 305 57 579 56 416 58 652 56 298 Dy 1.68 1.36 1.41 1.43 1.39 1.54 1.36 Co 70.1 68.1 68.5 68.1 67.0 69.5 67.1 Ho 0.33 0.25 0.26 0.27 0.26 0.28 0.25 Ni 304 312 313 316 321 311 322 Er 0.97 0.71 0.66 0.72 0.68 0.78 0.69 Cu 0.29 0.18 0.61 0.21 0.12 0.59 0.53 Tm 0.15 0.09 0.09 0.09 0.09 0.11 0.09 Zn 115 123 116 130 141 115 132 Yb 1.10 0.56 0.57 0.60 0.58 0.72 0.57 Rb 0.84 0.86 0.95 0.81 0.80 0.81 0.63 Lu 0.22 0.09 0.08 0.09 0.08 0.10 0.08 Sr 36.0 40.7 40.4 42.2 41.2 44.4 41.1 Hf 37.7 0.34 0.33 1.16 0.30 0.26 0.29 Y 8.71 6.36 6.43 6.83 6.68 7.58 6.46 Ta 0.08 0.05 0.05 0.06 0.04 0.04 0.04 Zr 1 268.00 4.14 3.80 27.90 3.08 3.31 2.87 Pb 1.03 1.83 1.75 1.49 1.66 1.81 1.35 Nb 1.38 0.89 0.98 1.13 0.98 0.86 0.96 Th 0.09 0.01 0.02 0.02 0.01 0.03 0.01 Mo 2.33 2.30 1.99 35.2 2.37 1.03 4.36 K 31 596 27 126 26 935 29 312 26 602 27 490 25 504 Cs 0.01 0.00 0.01 0.00 0.00 0.01 0.00
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表 4 华北克拉通中条山地区镁铁质岩石的Rb-Sr同位素和Sm-Nd同位素组成
Table 4. Rb-Sr and Sm-Nd isotopic data of mafic rocks from the Zhongtiao Mountain area, North China craton
样品 年龄(Ma) Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr ±2σ (87Sr/86Sr)i Sm(10-6) XX14-2-1 217 7.884 35.17 0.649 4 0.716 915 0.000 012 0.714 910 5 2.171 XX14-2-2 217 9.770 34.10 0.829 1 0.721 172 0.000 007 0.718 613 8 2.140 XX14-7-1 217 25.240 370.70 0.197 1 0.708 759 0.000 008 0.708 419 9 6.078 XX14-7-2 217 12.700 500.00 0.073 5 0.708 504 0.000 326 0.709 377 3 6.340 XX14-7-7 217 61.590 541.80 0.329 2 0.713 247 0.000 014 0.712 680 7 5.752 XX14-8-1 121 37.770 339.40 0.322 3 0.712 795 0.000 014 0.711 795 4 5.408 WX15-1-1 120 179.700 283.60 1.839 0 0.736 672 0.000 015 0.733 562 5 4.495 样品 Nd(10-6) 147Sm/144Nd 143Nd/144Nd ±2σ (143Nd/144Nd)i εNd (0) εNd (t) TDM(Ma) XX14-2-1 8.160 0.158 2 0.511 935 0.000 006 0.511 711 -13.70 -12.64 3 319 XX14-2-2 29.040 0.126 7 0.511 684 0.000 009 0.511 584 -18.61 -17.53 2 555 XX14-7-1 29.600 0.129 4 0.511 634 0.000004 0.511 531 -19.59 -18.56 2 731 XX14-7-2 27.740 0.125 5 0.511 664 0.000 008 0.511 565 -18.99 -17.90 2 555 XX14-7-7 25.190 0.130 0 0.511 710 0.000 009 0.511 524 -18.11 -16.26 2 608 XX14-8-1 21.940 0.124 0 0.511 713 0.000 010 0.511 616 -18.05 -16.95 2 431
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表 5 华北克拉通中条山地区镁铁质岩石锆石Hf同位素组成
Table 5. Zircon Hf isotopic composition of mafic rocks from Zhongtiao Mountain area, North China craton
样品 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ Hfi εHf(0) εHf(t) TDMHf (Ma) TDMC (Ma) U-Pb age (Ma) XX14-2-1_04 0.029 7 0.001 1 0.282 935 0.000 017 0.282 928 +5.7 +10.4 453 592 222.0 XX14-2-1_05 0.040 3 0.001 5 0.282 870 0.000 019 0.282 862 +3.4 +7.9 552 746 217.0 XX14-2-1_06 0.033 2 0.001 2 0.282 862 0.000 014 0.282 856 +3.1 +7.7 558 760 218.0 XX14-2-1_09 0.031 8 0.001 2 0.282 866 0.000 015 0.282 859 +3.2 +7.9 552 752 217.0 XX14-2-1_12 0.043 0 0.001 5 0.282 874 0.000 018 0.282 866 +3.5 +8.0 546 739 213.0 XX14-2-1_13 0.043 3 0.001 8 0.282 566 0.000 018 0.282 557 -7.3 -2.8 995 1 431 221.0 XX14-2-1_14 0.027 8 0.001 1 0.282 823 0.000 017 0.282 817 +1.7 +6.4 611 848 217.0 XX14-2-1_16 0.063 5 0.002 2 0.282 890 0.000 019 0.282 879 +4.1 +8.4 533 711 211.0 XX14-7-1 05 0.023 4 0.000 9 0.282 253 0.000 044 0.282 249 -18.4 -15.9 1 407 2 174 121.0 XX14-7-1 01 0.020 6 0.000 8 0.282 239 0.000 039 0.282 235 -18.9 -16.3 1 424 2 204 121.3 XX14-7-1 02 0.020 4 0.000 8 0.282 201 0.000 038 0.282 197 -20.3 -17.6 1 477 2 288 123.1 WX15-1-1_02 0.038 9 0.001 4 0.282 871 0.000 018 0.282 866 +3.4 +5.8 549 801 114.0 WX15-1-1_03 0.031 8 0.001 2 0.282 817 0.000 017 0.282 812 +1.5 +4.0 622 920 118.0 WX15-1-1_08 0.036 4 0.001 4 0.282 842 0.000 017 0.282 837 +2.4 +4.7 590 869 109.0 WX15-1-1_10 0.040 9 0.001 5 0.282 845 0.000 019 0.282 840 +2.5 +5.1 587 854 123.0 WX15-1-1_11 0.042 2 0.001 5 0.282 855 0.000 025 0.282 849 +2.8 +5.4 574 835 121.0 WX15-1-1_13 0.015 6 0.000 6 0.282 124 0.000 015 0.282 120 -23.0 -20.2 1 576 2 452 128.0 WX15-1-1_14 0.035 7 0.001 3 0.282 798 0.000 020 0.282 793 +0.9 +3.5 652 960 123.0
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