Bimodal Volcanic Rocks of Dingyuan Formation on the Northern Margin of Dabie Belt: A Witness of Late Neoproterozoic Rifting Event
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摘要: 为了了解大别山北缘构造属性，对定远组地层组成、形成时代及地球化学特征进行调查与研究.野外调查表明，定远组主要由一套变火山岩及云母片岩、云母石英片岩、浅粒岩、板岩等组成，其中变火山岩包括变玄武岩与变流纹质火山岩，并构成典型的双峰式火山岩建造；此外，还含有早古生代构造地层单位.运用LA-ICP-MS对酸性火山岩锆石进行U-Pb定年，获得725.7±1.4 Ma、736.6±5.4 Ma的年龄，形成时代为新元古代，不是前人认为的早古生代.变玄武岩分为低Ti（TiO2=1.19%）和高Ti（TiO2平均含量为3.11%）两种类型.低Ti玄武岩稀土总量较低（低于N-MORB），岩浆来自亏损的地幔源区.高Ti玄武岩又可以分为两种类型，一类富集Nb、Ta等元素，不相容元素的比值接近大陆裂谷玄武岩；另一种类型亏损Nb、Ta、Th、U等元素，岩浆可能来源于被下地壳或蚀变大洋地壳改造的地幔，其Th/Ta为1.6，与大陆裂谷玄武岩相当.总之，变玄武岩地球化学特征具有很大差别，是地幔源区不均一的反映.变酸性火山岩富集大离子亲石元素Rb、Ba、Th、U、K，亏损Nb、Ta、P、Ti等元素，锆石Hf同位素分析显示主体εHf（t）值为-3.0~-10，二阶段Hf模式年龄TDM2（Hf）为1 630~2 258 Ma，揭示其来源于古老地壳的部分熔融.定远组新元古代双峰式火山岩形成于大陆裂谷环境，并非岛弧构造背景.定远组双峰式火山岩及广泛分布的同时代岩浆岩，揭示了扬子陆块北缘在新元古代（800~611 Ma）时期一次重要的大陆边缘裂解-岩浆事件，是Rodinia超级古大陆裂解作用深部地球动力学的地表响应.Abstract: In order to understand the tectonic properties of the northern margin of Dabie belt,the stratum,age and geochemical characteristics of Dingyuan Formation were investigated and studied. Field survey shows that the Dingyuan Formation is composed of a set of metavolcanic rocks,mica schist,mica quartz schist,leptite and slate,etc.. The metavolcanics are mainly metabasalts and meta-rhyolitic volcanics which constitute typical bimodal volcanic formation. In addition,it contains Early Paleozoic tectono-stratigraphic unit. The LA-ICP-MS U-Pb dating of zircon from acidic volcanic rocks yields the ages of 725.7±1.4 Ma and 736.6±5.4 Ma,indicating the Neoproterozoic rather than the Early Paleozoic ages. The metabasalts are divided into two types: low Ti(TiO2=1.19%) and high Ti(TiO2=3.11% on average). The total amount of rare earth elements of low Ti basalts is lower than N-MORB type and the magma came from the depleted mantle source area. The high Ti basalt can be further divided into two types. One type is rich in Nb and Ta,and the ratio of incompatible elements is close to that of continental rift basalt. The other type of loss-Nb,Ta,Th,U and other elements,the magma probably came from the modified mantle by the lower crust or altered oceanic crust. Its Th/Ta is 1.6,which is close to the Th/Ta ratio of the continental rift basalt. In a word,the geochemical characteristics of the metamorphic basalts are very different,which reflects the heterogeneity of the source area of the mantle. Large ionic lithophile elements Rb,Ba,Th,U and K are enriched in acidic volcanic rocks,depletion Nb,Ta,P,Ti and other elements,the value of εHf(t) is -3.0 to -10 by zircon Hf isotope analysis,two-stage Hf mode age (TDM2(Hf)) is 1 630-2 258 Ma,it reveals that it came from a partial melting of the ancient crust. The Neoproterozoic bimodal volcanic rocks of the Dingyuan Formation was formed in the continental rift environment,not in the background of island arc structure. The bimodal volcanic rocks and the widely distributed contemporaneous magmatic rocks reveal an important continental margin rifting-magma event in the northern margin of the Yangtze Block during the Neoproterozoic period (800-611 Ma),which is ground surface response of the deep dynamics to the breakup of supercontinent Rodinia.
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图 1 西大别山定远地区地质简图
据河南省第三地质调查队, 1991, 1∶5万宣化镇幅说明书；河南省第三地质调查队, 1998, 1∶5万千斤河棚幅说明书
Fig. 1. Geological sketch map of Dingyuan area of the West Dabie belt
图 2 定远组定年样品野外宏观及显微特征
a.定远组变流纹质火山岩（浅色）与变玄武岩（深色）互层特征；b.11YX26变流纹岩变余斑状、基质霏细-微粒结构（正交×25）；c. 11YX26变流纹岩变余流纹构造（单偏光×50）；d.定远组变流纹质熔结凝灰岩变余塑性玻屑定向排列构成假流纹构造；e.11YX32绢云变质流纹岩变余斑状、基质隐晶-微粒结构镜下特征（正交×25）；f.变玄武岩显微镜下特征（正交×100）. Pl. 斜长石；Kfs. 钾长石；Chl. 绿泥石；Ep. 绿帘石；Act. 阳起石
Fig. 2. Macro and microscopic features of volcanic rocks from Dingyuan Formation
图 3 定远组测年样品代表性锆石阴极发光特征及位置
实线圆圈为U-Pb测点，虚线圆圈为Hf测点
Fig. 3. Representative CL images and dating spots of zircons from 11YX26 and 11YX32
图 4 定远组变质流纹岩锆石U-Pb谐和图
Fig. 4. U-Pb concordia diagrams of the zircons from 11YX26 and 11YX32
图 5 定远组火山岩TAS及硅碱图解
Fig. 5. TAS and SiO2-K2O diagrams for Dingyuan Formation volcanic rocks
图 6 定远组火山岩稀土及微量元素特征
Fig. 6. The REE and trace element characteristics of the Dingyuan Formation volcanic rocks
图 7 定远组玄武岩的La/Sm-Sm/Yb图解
DMM.亏损地幔；PM.原始地幔；CLM.大陆岩石圈地幔；LC.下地壳；UC.上地壳；CC.大陆壳
Fig. 7. La/Sm-Sm/Yb diagram of the basalts from Dingyuan Formation
图 8 定远组变玄武岩同化混染作用的判别图解
Fig. 8. Discrimination diagrams of assimilate-contamination for the basalts from Dingyuan Formation
图 9 定远组变火山岩Zr-Zr/Y和Hf-Th-Nb图解
Fig. 9. Plots of Zr-Zr/Y and Hf-Th-Nb for the Dingyuan Formation volcanic rocks
图 10 定远组玄武岩Nb/U-Nb/Th和Nb/Th-Th/U图解
OIB.洋岛玄武岩；N-MORB.正常洋中脊；IAB.岛弧玄武岩；CC.大陆壳；PM.地幔柱
Fig. 10. Nb/U vs. Nb/Th diagram and Nb/Th vs. Th/U diagram of the basalts from Dingyuan Formation
表 1 定远组变质流纹岩锆石U-Pb测年分析结果
Table 1. Zircon U-Pb dating data of meta-rhyolite from Dingfyuan Formation
点号 元素含量(10-6) Th/U 同位素比值 年龄(Ma) Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 11YX26 1 894 211 3.014 4 0.064 3 0.000 3 1.052 0 0.009 9 0.118 7 0.000 9 750 11 730 5 723 5 2 156 43 1.616 3 0.063 9 0.000 8 1.047 4 0.013 8 0.119 1 0.000 9 737 28 728 7 726 5 3 269 92 1.609 2 0.064 3 0.000 5 1.051 9 0.013 0 0.118 7 0.001 0 750 19 730 6 723 6 4 650 175 2.067 6 0.064 7 0.000 4 1.055 9 0.010 0 0.118 3 0.000 8 765 18 732 5 721 5 5 1 104 234 2.472 6 0.063 8 0.000 2 1.051 7 0.006 1 0.119 6 0.000 6 744 7 730 3 728 4 6 307 147 0.955 6 0.063 7 0.000 2 1.047 6 0.007 6 0.119 4 0.000 8 731 7 728 4 727 4 7 247 81 1.379 5 0.064 9 0.000 4 1.065 2 0.009 1 0.119 1 0.000 9 772 11 736 4 726 5 8 205 69 1.302 4 0.063 8 0.000 3 1.047 1 0.010 4 0.119 1 0.001 0 744 11 727 5 725 6 9 122 48 1.107 7 0.064 2 0.000 4 1.051 9 0.011 4 0.118 8 0.001 1 750 10 730 6 724 6 10 161 42 1.422 4 0.065 0 0.000 4 1.062 9 0.011 0 0.118 8 0.001 1 776 14 735 5 724 7 11 487 129 1.522 5 0.064 4 0.000 3 1.058 2 0.009 4 0.119 0 0.000 8 767 9 733 5 725 5 12 1 681 273 2.400 7 0.064 4 0.000 2 1.057 1 0.006 8 0.119 1 0.000 7 754 7 732 3 725 4 13 4 537 658 2.668 9 0.063 5 0.000 1 1.040 0 0.005 4 0.118 8 0.000 6 724 6 724 3 724 3 14 276 53 1.658 6 0.064 5 0.000 4 1.062 1 0.009 8 0.119 5 0.000 8 767 14 735 5 727 5 15 11 0 305 1.376 9 0.063 9 0.000 2 1.048 5 0.008 6 0.119 0 0.000 9 739 1 728 4 725 5 16 576 166 1.277 0 0.063 9 0.000 2 1.048 6 0.007 9 0.119 0 0.000 8 739 7 728 4 725 4 17 1 186 260 1.615 4 0.064 0 0.000 2 1.048 4 0.008 6 0.118 9 0.000 9 739 1 728 4 724 5 18 211 40 1.578 5 0.064 3 0.000 4 1.059 0 0.012 1 0.119 5 0.001 0 750 14 733 6 728 6 19 718 128 1.768 1 0.064 1 0.000 3 1.054 8 0.009 9 0.119 4 0.001 0 746 7 731 5 727 6 20 2 335 355 2.192 3 0.064 0 0.000 2 1.049 8 0.007 3 0.119 1 0.000 7 739 1 729 4 725 4 21 1 392 243 1.612 2 0.064 2 0.000 2 1.056 8 0.007 5 0.119 4 0.000 7 750 13 732 4 727 4 22 303 59 1.348 9 0.063 7 0.000 5 1.043 2 0.010 8 0.118 9 0.000 8 731 13 726 5 724 5 23 286 55 1.249 6 0.063 9 0.000 5 1.048 9 0.009 5 0.119 1 0.000 7 739 21 728 5 725 4 24 1 141 150 1.836 4 0.066 4 0.000 3 1.092 0 0.007 2 0.119 4 0.000 7 818 9 749 3 727 4 25 294 49 1.519 1 0.064 5 0.000 4 1.059 0 0.009 2 0.119 2 0.000 8 767 12 733 5 726 5 26 253 48 1.571 1 0.064 9 0.000 5 1.066 3 0.009 9 0.119 3 0.000 8 772 16 737 5 726 5 27 1 959 216 2.180 9 0.064 8 0.000 3 1.066 1 0.006 1 0.119 4 0.000 5 766 5 737 3 727 3 28 380 72 1.267 5 0.064 6 0.000 5 1.063 2 0.009 7 0.119 5 0.000 8 761 17 735 5 728 5 29 478 57 1.520 4 0.063 9 0.000 7 1.046 9 0.012 5 0.118 9 0.000 8 739 19 727 6 724 5 30 373 53 1.692 9 0.063 9 0.000 6 1.050 0 0.013 1 0.119 1 0.000 7 739 22 729 6 726 4 31 256 43 1.382 0 0.064 3 0.000 6 1.052 9 0.010 8 0.118 8 0.000 8 754 14 730 5 724 4 32 1 039 154 1.869 1 0.064 1 0.000 3 1.052 7 0.008 1 0.119 1 0.000 8 746 7 730 4 725 5 33 328 62 1.737 2 0.064 0 0.000 3 1.052 5 0.009 6 0.119 2 0.000 8 743 11 730 5 726 5 34 1 190 212 1.908 0 0.064 7 0.000 2 1.061 4 0.007 6 0.119 0 0.000 7 765 2 735 4 725 4 35 244 50 1.687 3 0.065 0 0.000 5 1.066 3 0.009 9 0.119 0 0.000 8 776 16 737 5 725 5 36 813 189 1.768 2 0.064 3 0.000 2 1.057 2 0.007 6 0.119 2 0.000 7 750 12 732 4 726 4 37 247 67 1.727 8 0.065 3 0.000 8 1.073 5 0.011 9 0.119 4 0.000 6 783 25 740 6 727 4 38 958 239 2.251 5 0.064 5 0.000 2 1.062 1 0.007 4 0.119 4 0.000 7 761 6 735 4 727 4 39 237 91 1.582 1 0.064 9 0.000 3 1.065 5 0.008 3 0.119 1 0.000 8 772 10 737 4 726 4 40 160 62 1.876 7 0.065 1 0.000 4 1.069 6 0.009 1 0.119 2 0.000 8 789 13 739 4 726 4 11YX32 1 932 241 1.049 8 0.534 2 0.265 0 17.548 0 6.662 6 0.227 4 0.047 1 4 339 1 038 2 965 382 1 321 248 2 129 174 1.507 4 0.073 0 0.004 3 1.172 3 0.067 7 0.118 2 0.002 1 1 017 116 788 32 720 12 3 256 451 1.031 7 0.066 5 0.002 8 1.163 5 0.047 6 0.126 9 0.001 5 833 89 784 22 770 9 4 690 371 1.222 2 0.165 4 0.019 8 6.430 6 1.386 6 0.160 4 0.010 8 2 522 204 2 036 192 959 60 5 292 358 1.782 5 0.067 9 0.003 0 1.119 1 0.048 6 0.120 0 0.001 9 865 91 763 23 730 11 6 331 629 0.989 6 0.064 2 0.002 4 1.064 1 0.038 7 0.120 3 0.001 4 746 84 736 19 732 8 7 521 647 1.673 9 0.062 9 0.002 4 1.085 1 0.041 1 0.124 5 0.001 6 706 81 746 20 756 9 8 302 170 3.743 9 0.067 8 0.003 9 1.108 5 0.062 8 0.121 1 0.002 5 861 122 757 30 737 14 9 92 137 1.338 9 0.075 2 0.004 7 1.222 1 0.072 9 0.121 2 0.002 4 1 076 125 811 33 737 14 10 1 189 1439 1.404 0 0.084 0 0.002 5 1.515 7 0.042 5 0.129 8 0.001 3 1 292 56 937 17 787 7 11 332 307 2.354 5 0.064 9 0.003 3 1.093 8 0.056 5 0.121 3 0.001 9 772 106 750 27 738 11 12 332 575 0.965 5 0.064 3 0.002 6 1.212 0 0.049 0.135 5 0.001 9 750 86 806 23 819 11 13 1 010 684 3.925 3 0.067 3 0.002 5 1.112 9 0.039 6 0.119 1 0.001 5 856 76 760 19 725 9 14 416 615 1.285 2 0.067 3 0.002 7 1.159 7 0.043 3 0.124 4 0.001 6 848 81 782 20 756 9 15 277 397 1.434 9 0.060 8 0.002 9 1.082 5 0.051 7 0.128 9 0.002 3 632 104 745 25 781 13 16 431 685 1.180 6 0.072 0 0.003 0 1.204 2 0.046 3 0.121 4 0.001 9 985 118 803 21 739 11 17 106 145 1.426 7 0.074 3 0.005 3 1.199 5 0.076 9 0.121 4 0.002 7 1 050 143 800 36 739 16 18 89 139 1.121 0 0.063 8 0.004 1 1.229 3 0.079 9 0.139 9 0.002 9 744 137 814 36 844 16 19 600 485 2.678 0 0.064 0 0.002 5 1.087 2 0.042 3 0.121 5 0.001 8 743 88 747 21 739 10 20 149 238 1.257 1 0.062 0 0.003 4 1.022 6 0.053 7 0.121 3 0.002 4 672 117 715 27 738 14 21 215 333 1.184 7 0.067 5 0.003 3 1.218 5 0.062 2 0.129 8 0.002 2 854 104 809 28 787 12 22 271 469 1.080 2 0.062 1 0.002 9 1.048 8 0.048 6 0.121 5 0.001 5 676 100 728 24 739 9 23 749 517 3.207 0 0.067 9 0.002 9 1.142 4 0.048 2 0.121 4 0.001 4 865 89 774 23 739 8 
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表 2 定远组变质流纹岩锆石Hf同位素分析结果
Table 2. Zircon Hf isotopic compositions of meta-rhyolite from Dingyuan Formation
点号 年龄(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(t) TDM(Ma) T2DM(Ma) fLu/Hf 11YX26.1 726 0.053 1 0.001 4 0.282 127 0.000 028 0.282 107 -7.5 1 605 2 108 -0.96 11YX26.2 726 0.043 9 0.001 2 0.282 174 0.000 030 0.282 157 -5.8 1 531 1 999 -0.96 11YX26.3 726 0.046 3 0.001 3 0.282 101 0.000 028 0.282 083 -8.4 1 636 2 161 -0.96 11YX26.4 726 0.069 7 0.001 9 0.282 189 0.000 031 0.282 163 -5.5 1 537 1 985 -0.94 11YX26.5 726 0.060 0 0.001 6 0.282 185 0.000 028 0.282 163 -5.5 1 530 1 985 -0.95 11YX26.6 726 0.056 7 0.001 5 0.282 241 0.000 028 0.282 221 -3.5 1 445 1 856 -0.96 11YX26.7 726 0.041 1 0.001 1 0.282 184 0.000 027 0.282 168 -5.0 1 513 1 974 -0.97 11YX26.8 726 0.035 1 0.001 0 0.282 203 0.000 030 0.282 190 -4.6 1 480 1 926 -0.97 11YX26.9 726 0.032 9 0.001 0 0.282 233 0.000 023 0.282 220 -3.5 1 437 1 859 -0.97 11YX26.10 726 0.035 6 0.001 0 0.282 221 0.000 027 0.282 207 -4.0 1 456 1 887 -0.97 11YX26.11 726 0.041 6 0.001 1 0.282 196 0.000 024 0.282 181 -4.9 1 495 1 945 -0.97 11YX26.12 726 0.064 5 0.001 7 0.282 205 0.000 026 0.282 182 -4.9 1 505 1 942 -0.95 11YX26.13 726 0.080 8 0.002 0 0.282 231 0.000 024 0.282 204 -4.1 1 481 1 895 -0.94 11YX26.14 726 0.035 0 0.001 0 0.282 213 0.000 030 0.282 199 -4.2 1 466 1 904 -0.97 11YX26.15 726 0.064 3 0.001 8 0.282 257 0.000 025 0.282 232 -3.1 1 435 1 831 -0.95 11YX26.16 726 0.065 7 0.001 8 0.282 242 0.000 025 0.282 217 -3.6 1 457 1 865 -0.95 11YX26.17 726 0.070 5 0.001 8 0.282 104 0.000 028 0.282 079 -8.5 1 653 2 170 -0.95 11YX26.18 726 0.046 9 0.001 3 0.282 162 0.000 029 0.282 145 -6.2 1 548 2 025 -0.96 11YX26.19 726 0.066 5 0.001 8 0.282 200 0.000 028 0.282 174 -5.1 1 519 1 959 -0.94 11YX26.20 726 0.065 0 0.001 5 0.282 241 0.000 023 0.282 220 -3.5 1 448 1 859 -0.95 11YX32.1 1 321 0.037 9 0.001 1 0.282 181 0.000 029 0.282 153 7.4 1 515 1 630 -0.97 11YX32.2 737 0.064 1 0.001 8 0.282 141 0.000 033 0.282 116 -7.0 1 601 2 081 -0.95 11YX32.3 770 0.053 1 0.001 5 0.282 241 0.000 026 0.282 219 -2.6 1 447 1 833 -0.95 11YX32.4 959 0.049 7 0.001 4 0.282 217 0.000 023 0.282 192 0.7 1 476 1 773 -0.96 11YX32.6 737 0.062 7 0.001 7 0.282 183 0.000 032 0.282 159 -5.4 1 538 1 987 -0.95 11YX32.7 737 0.046 4 0.001 3 0.282 232 0.000 022 0.282 214 -3.5 1 453 1 866 -0.96 11YX32.8 737 0.058 7 0.001 8 0.282 219 0.000 030 0.282 194 -4.2 1 489 1 909 -0.95 11YX32.9 737 0.067 2 0.002 1 0.282 090 0.000 034 0.282 061 -8.9 1 686 2 204 -0.94 11YX32.10 737 0.034 7 0.001 1 0.282 191 0.000 030 0.282 176 -4.9 1 502 1 950 -0.97 11YX32.11 787 0.060 0 0.001 8 0.282 227 0.000 028 0.282 200 -2.9 1 479 1 864 -0.94 11YX32.12 737 0.094 5 0.002 7 0.282 205 0.000 040 0.282 167 -5.1 1 547 1 968 -0.92 11YX32.13 819 0.073 2 0.002 6 0.282 102 0.000 041 0.282 062 -7.0 1 692 2 149 -0.92 11YX32.14 737 0.105 3 0.002 9 0.282 077 0.000 033 0.282 036 -9.8 1 745 2 258 -0.91 11YX32.15 737 0.064 2 0.001 9 0.282 221 0.000 032 0.282 195 -4.2 1 490 1 907 -0.94 11YX32.16 781 0.052 1 0.001 5 0.282 243 0.000 027 0.282 221 -2.3 1 445 1 822 -0.95 11YX32.17 737 0.086 4 0.003 1 0.282 226 0.000 039 0.282 183 -4.6 1 534 1 934 -0.91 11YX32.18 737 0.055 2 0.001 6 0.282 337 0.000 040 0.282 314 0.1 1 316 1 642 -0.95 11YX32.20 844 0.051 0 0.001 5 0.282 263 0.000 029 0.282 240 -0.2 1 413 1 739 -0.96 11YX32.21 737 0.132 8 0.003 6 0.282 369 0.000 043 0.282 319 0.2 1 341 1 632 -0.89 11YX32.22 737 0.058 9 0.001 9 0.282 254 0.000 034 0.282 227 -3.0 1 444 1 835 -0.94 11YX32.23 787 0.047 5 0.001 6 0.282 254 0.000 039 0.282 230 -1.8 1 431 1 797 -0.95 11YX32.24 737 0.045 7 0.001 4 0.282 232 0.000 031 0.282 213 -3.5 1 455 1 867 -0.96
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表 3 定远组火山岩主量（%）、微量和稀土元素含量（10-6）
Table 3. Contents of major element (%), trace and REE(10-6)elements of the Dingyuan Formation volcanic rocks
样号 11YX26 11YX27 11YX28 11YX29 11YX30 11YX31 12YX26 12YX27 变质流纹岩 变质流纹质熔结凝灰岩 变质玄武岩 SiO2 77.91 78.58 73.21 73.89 44.55 49.76 45.11 45.22 TiO2 0.12 0.22 0.48 0.51 3.29 1.19 3.02 3.03 Al2O3 12.20 11.94 10.98 10.36 12.56 14.04 13.90 13.52 Fe2O3 0.54 0.82 2.43 2.10 5.77 3.31 8.80 8.47 FeO 0.40 0.16 0.82 1.06 9.98 7.77 6.40 7.05 MnO 0.01 0.01 0.07 0.08 0.26 0.18 0.23 0.25 MgO 0.11 0.19 1.76 1.94 8.42 9.10 4.95 5.07 CaO 0.08 0.14 5.13 5.37 10.39 9.43 9.30 8.82 Na2O 1.34 1.91 1.80 2.45 1.17 1.84 1.50 1.88 K2O 6.83 5.44 2.32 1.26 0.70 1.18 0.43 1.44 P2O5 0.03 0.03 0.13 0.13 0.46 0.03 0.33 0.33 LOI 0.36 0.54 0.88 0.64 2.22 1.90 5.40 4.23 Total 99.93 99.99 100.00 99.79 99.77 99.72 99.37 99.31 Mg# 21 31 55 58 54 64 42 42 Ba 1 387 1 854 599 486 167 207 185 414 Be 1 1 2 1 2 1 1 1 Co 2 1 8 9 55 50 46 42 Cr 14 8 59 66 460 497 51 47 Cs 1.70 1.57 1.58 0.71 1.27 1.43 0.42 0.56 Cu 17 26 8 6 78 15 - - Ga 8.71 9.41 14.16 14.58 23.21 16.35 23.80 23.00 Hf 5.89 7.05 6.32 6.54 10.43 2.01 3.93 4.27 Nb 20 18 9 11 77 2 13 14 Ta 1.49 1.02 0.66 0.83 3.81 0.23 0.58 0.60 Ni 4 3 22 21 197 181 64 59 Pb 14 9 14 17 10 8 17 11 Rb 172 139 95 41 39 70 10 31 Sc 3.40 3.84 9.19 9.25 33.78 32.09 44.00 42.90 Sr 120 122 209 240 425 261 800 578 Th 14.72 10.32 10.72 10.77 8.50 0.40 1.00 0.88 U 1.94 1.15 2.26 2.34 1.59 0.07 0.17 0.17 V 21 15 62 75 396 208 490 468 Zn 15 14 40. 42 163 109 140 140 Zr 159 215 195 190 259 39 141 157 Y 17 14 21 22 30 12 37 37 La 56.14 33.28 28.89 30.22 61.08 2.97 14.50 15.20 Ce 110.60 78.16 55.01 56.25 116.70 7.15 33.20 34.20 Pr 12.13 9.34 7.03 7.16 13.63 1.16 5.03 5.20 Nd 41.73 34.22 26.24 26.45 52.06 6.21 24.60 24.70 Sm 6.46 5.41 4.96 5.00 9.25 1.92 6.31 6.36 Eu 0.77 0.88 1.03 1.07 2.98 1.06 2.31 2.36 Gd 4.82 4.28 4.36 4.45 8.14 2.15 7.01 7.10 Tb 0.71 0.61 0.75 0.76 1.27 0.43 1.14 1.16 Dy 3.43 2.99 4.18 4.24 6.76 2.61 7.18 7.30 Ho 0.62 0.53 0.80 0.81 1.19 0.49 1.44 1.48 Er 2.01 1.56 2.32 2.37 3.24 1.35 3.92 3.99 Tm 0.34 0.25 0.36 0.38 0.47 0.22 0.57 0.58 Yb 2.19 1.56 2.34 2.45 3.00 1.33 4.00 4.00 Lu 0.35 0.26 0.36 0.39 0.41 0.21 1.00 1.00
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表 4 定远组、OIB、岛弧、N-MORB及大陆裂谷玄武岩化学库的不相容元素比值
Table 4. Incompatible element ratios of basalts of Dingyuan Formation, OIB, island arc, N-MORB and continental rift type
比值 低钛11YX31 高钛11YX30 高钛12YX26-27 大陆裂谷 OIB EMⅠOIB EMⅡOIB N-MORB 岛弧 Zr/Nb 16.31 3.37 11.03 5.83 5.83 3.50~13.10 4.40~7.80 30.00 17.22 La/Nb 1.24 0.80 1.10 0.93 0.77 0.78~1.32 0.79~1.19 1.07 2.35 Ba/Nb 86.27 2.17 21.95 13.85 7.29 9.10~23.40 6.40~13.40 1.70~8.00 51.47 Ba/Th 515.20 19.61 327.73 120.68 87.50 80.00~204.00 57.00~105.00 60.00 138.67 Rb/Nb 29.37 0.51 1.49 0.74 0.65 0.69~1.23 0.58~0.87 0.36 4.07 K/Nb 91.62 49.33 203.10 358.02 250.00 207.00~523.00 203.00~378.00 210.00~350.00 1 450.08 Th/Nb 0.17 0.11 0.07 0.11 0.88 0.09~0.13 0.10~0.17 0.03~0.07 0.37 Th/La 0.14 0.14 0.06 0.12 0.11 0.09~0.15 0.11~0.18 0.07 0.16 Ba/La 69.59 2.73 20.00 14.83 9.46 11.30~19.10 7.30~13.50 4.00 21.89 Th/Ta 1.72 2.23 1.60 1.65 1.13 1.25 8.24 注：OIB、N-MORB数据据Sun and McDonough (1989)；EMⅠOIB和EMⅡOIB据Weaver（1991）和 Hart et al.（1992） ；大陆裂谷据王金荣等（2016）；岛弧据杨婧等（2016）.
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