Petrogenesis of Jingshan Granites from Southeast Margin of North China Block and Its Tectonic Implications
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摘要: 对华北东南缘荆山花岗岩进行了锆石U-Pb定年、微量元素和Hf同位素分析，全岩主微量元素和Sr-Nd同位素分析.LA-ICP-MS锆石U-Pb定年结果表明，荆山花岗岩形成于晚侏罗世(160.9±0.8~161.6±1.5 Ma).残留锆石的U-Pb年龄主要为三叠纪和新元古代，分别与大别-苏鲁造山带超高压变火成岩的变质年龄和原岩年龄一致.这些花岗岩为钙碱性-高钾钙碱性，具有弧型的微量元素分布特征和富集的Sr-Nd-Hf同位素组成，即高的全岩(87Sr/86Sr)i比值(0.708 0~0.709 1)，低的εNd(t)值(-15.6~-13.5)和锆石εHf(t)值(-23.1~-9.5)，对应的两阶段Nd-Hf模式年龄主要为古元古代.这些锆石U-Pb同位素年代学和地球化学特征与大别-苏鲁造山带超高压变火成岩一致，表明它们之间存在成因联系.特别地，残留锆石新元古代和三叠纪U-Pb年龄是俯冲华南陆壳的标志性特征.因此，荆山花岗岩是俯冲华南陆壳部分熔融的产物，华南陆壳是三叠纪大陆碰撞过程中进入华北地壳之中的.这些花岗岩具有低的Rb含量、高的Sr和Ba含量，低的Rb/Sr比值以及低的全岩锆饱和温度和锆石Ti温度(~700℃)，表明它们源于俯冲华南陆壳低温加水部分熔融，可能与侏罗纪古太平洋板块俯冲于中国东部之下有关.Abstract: In this paper it presents a combined study of zircon U-Pb ages, trace elements and Hf isotopes, and whole-rock major-trace elements and Sr-Nd isotopes for the Jingshan granites from the southeast margin of the North China block (NCB). LA-ICP-MS zircon U-Pb dating yielded Late Jurassic ages of 160.9±0.8 to 161.6±1.5 Ma. Relict zircons have U-Pb ages of mainly Triassic and Neoproterozoic, in agreement with metamorphic and protolith ages for the ultrahigh-pressure (UHP) meta-igneous rocks in the Dabie-Sulu orogenic belt, respectively. These granites are calc-alkaline to high-K calc-alkaline, and exhibit arc-type trace element features and enriched Sr-Nd-Hf isotope compositions, i.e. high whole-rock (87Sr/86Sr)i ratios of 0.708 0 to 0.709 1, low εNd(t) values of -15.6 to -13.5 and zircon εHf(t) values of -23.1 to -9.5, with two-stage Nd-Hf model ages mainly of Paleoproterozoic. These zircon U-Pb geochronological and geochemical characteristics are consistent with those of the UHP meta-igneous rocks in the Dabie-Sulu orogenic belt, indicating a genetic link between them. In particular, the Neoproterozoic and Triassic U-Pb ages of relict zircons are characteristic features of the subducted continental crust of the South China block (SCB). Therefore, the Jingshan granites are the product of partial melting of the subducted SCB continental crust, which would be incorporated into the crust of the NCB during the Triassic continental collision. These granites have low Rb contents, high Sr, Ba contents, and thus low Rb/Sr ratios, and low zirconium saturation and Ti-in-zircon temperatures (~700℃), suggesting their derivation from low-temperature partial melting of the subducted SCB continental crust with water addition, which might be related to the subduction of the paleo-Pacific plate beneath eastern China in the Jurassic.
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图 1 蚌埠地区构造位置图(a)和地质简图(b)(修改自Liu et al., 2012a)
Fig. 1. The tectonic location map (a) and the geologic sketch map (b) of the Bengbu area (modified after Liu et al., 2012a)
图 2 蚌埠地区荆山花岗岩露头和手标本照片
a.基性岩脉切穿花岗岩；b.花岗岩中的细晶岩脉；c.粗粒花岗岩中的暗色包体；d.细粒花岗岩
Fig. 2. Photographs of outcrop and hand specimen for the Jingshan granites in the Bengbu area
图 3 荆山花岗岩显微照片
a和c拍摄于单偏光镜下，b和d拍摄于正交偏光镜下；矿物缩写：Pl.斜长石，Kfs.钾长石，Qz.石英，Bt.黑云母，Grt.石榴石
Fig. 3. Photomicrographs of the Jingshan granites
图 4 荆山花岗岩Na2O+K2O-SiO2图(a)和A/NK-A/CNK图(b)(文献数据来自Li et al., 2014)
Fig. 4. Diagrams of Na2O+K2O versus SiO2 (TAS) (a) and A/NK versus A/CNK (b) for the Jingshan granites (literature data are from Li et al., 2014)
图 5 荆山花岗岩哈克图解(文献数据来自Li et al., 2014)
Fig. 5. Hacker diagrams for the Jingshan granites (literature data are from Li et al., 2014)
图 6 荆山花岗岩球粒陨石标准化稀土元素分布图(a)和原始地幔标准化微量元素蛛网图(b)
Fig. 6. Chondrite-normalized rare earth element (REE) distribution patterns (a) and primitive mantle-normalized trace-element spidergrams (b) for the Jingshan granites
图 7 荆山花岗岩全岩初始Sr-Nd同位素组成图，回算至t=161 Ma
文献数据来自Li et al.(2014)，大别-苏鲁造山带超高压花岗片麻岩和榴辉岩以及华北下地壳和上地壳的Sr-Nd同位素组成分别据Zhao et al.(2017b)和Jahn et al.(1999)
Fig. 7. Diagram of initial Sr-Nd isotope compositions for the Jingshan granites, calculated back to 161 Ma
图 8 荆山花岗岩锆石阴极发光照片
圆圈代表数据分析点，数字代表206Pb/238U年龄
Fig. 8. Zircon cathodoluminescence (CL) images for the Jingshan granites
图 10 荆山花岗岩锆石球粒陨石标准化稀土元素分布图
球粒陨石稀土元素含量据McDonough and Sun(1995)，大别-苏鲁造山带花岗片麻岩锆石稀土元素数据来自Chen et al.(2010)
Fig. 10. Chondrite-normalized REE patterns for zircon from the Jingshan granites
图 11 荆山花岗岩残留锆石三叠纪U-Pb年龄统计图
数据来源：Xu et al.(2005, 2013)；Wang et al.(2013)；Li et al.(2014)；本文
Fig. 11. Histogram of Triassic U-Pb ages for relict zircons in the Jingshan granites
图 12 (a) 荆山花岗岩、大别造山带碰撞后花岗岩和蚌埠地区早白垩世花岗岩全岩锆饱和温度统计图；(b) 荆山花岗岩锆石Ti温度统计图
数据来源：He et al.(2011)；Liu et al. (2012a)；Li et al.(2014)；本文
Fig. 12. Zircon saturation temperatures for the Jingshan granites, post-collisional granites in the Dabie orogen and Early Cretaceous granites in the Bengbu area (a); Ti-in-zircon temperatures for the Jingshan granites (b)
图 13 荆山花岗岩Rb/Sr-Ba(a)和Rb/Sr-Sr图解
据Weinberg and Hasalová(2015)；文献数据来自Li et al.(2014)
Fig. 13. Diagrams of Rb/Sr-Ba (a) and Rb/Sr-Sr
表 1 荆山花岗岩全岩主量和微量元素组成
Table 1. Major and trace element compositions for the Jingshan granites
样品 16JS01 16JS03 16JS07 16JS08 16JS11 16JS14 16JS16 16JS19 16JS20 16JS23 16JS24 16JS28 16JS37 主量元素(%) SiO2 73.9 72.1 73.2 73.3 73.3 72.8 72.4 74.0 72.8 72.6 74.0 74.8 73.8 TiO2 0.06 0.10 0.07 0.07 0.07 0.07 0.10 0.03 0.09 0.08 0.06 0.03 0.07 Al2O3 14.7 15.9 14.7 14.9 14.8 14.7 15.4 14.6 14.8 14.8 15.0 14.5 14.8 Fe2O3 0.73 0.93 0.75 0.70 0.95 0.84 1.10 0.65 0.98 0.93 0.62 0.30 0.75 MnO 0.04 0.05 0.04 0.05 0.04 0.04 0.03 0.04 0.06 0.07 0.01 0.03 0.05 MgO 0.14 0.22 0.15 0.16 0.16 0.12 0.24 0.08 0.21 0.19 0.11 0.07 0.15 CaO 1.37 1.68 1.38 1.53 1.36 1.40 2.24 1.43 1.60 1.42 1.20 1.04 1.38 Na2O 4.60 4.94 4.55 4.54 4.47 4.38 4.71 4.41 4.53 4.67 4.91 4.84 4.54 K2O 3.90 3.75 3.99 3.76 3.92 4.19 2.89 3.98 3.77 3.92 3.50 3.62 4.01 P2O5 0.01 0.02 0.01 0.01 0.01 0.01 0.02 < 0.01 0.02 0.02 0.01 < 0.01 0.01 LOI 0.71 0.54 0.66 0.58 0.81 0.50 0.74 0.65 0.66 0.83 0.51 0.53 0.58 Total 99.6 100 99.1 99.3 99.3 98.8 99.4 99.5 99.2 99.1 99.8 99.4 99.8 K2O/Na2O 0.85 0.76 0.88 0.83 0.88 0.96 0.61 0.90 0.83 0.84 0.71 0.75 0.88 Mg# 31.1 35.8 32.0 35.0 28.4 25.2 33.9 22.5 33.5 32.5 29.5 35.4 32.0 A/CNK 1.03 1.04 1.03 1.04 1.05 1.03 1.03 1.03 1.03 1.02 1.07 1.05 1.03 TZrn(℃) 715 723 709 709 703 714 718 718 724 712 712 722 707 微量元素(10-6) Rb 124 95.8 145 121 107 110 69.3 112 91.7 127 85.2 106 144 Ba 1 265 1 974 1 581 1 765 1 665 1 760 1 667 1 336 1 756 1 483 1 691 738 1 643 Th 1.72 2.40 1.49 1.54 1.95 1.53 1.37 1.24 2.07 1.61 1.32 1.04 1.54 U 1.06 0.77 1.20 1.15 2.53 0.96 0.70 0.87 1.54 0.88 0.70 1.13 1.22 Nb 9.55 6.31 9.39 5.68 7.23 5.76 5.00 5.94 6.80 8.47 4.08 9.31 9.42 Ta 0.54 0.35 0.40 0.32 0.40 0.27 0.24 0.25 0.36 0.40 0.18 0.57 0.42 Sr 388 638 482 531 469 452 730 404 549 478 539 229 491 Pb 44.1 37.4 55.1 42.5 34.2 42.3 33.6 47.3 39.2 37.8 25.6 33.3 57.1 Zr 67.6 76.8 62.8 61.4 56.2 67.2 71.8 69.5 76.7 66.5 61.8 71.4 60.1 Hf 1.93 1.99 1.77 1.66 1.55 1.86 1.90 1.83 2.11 1.81 1.68 2.54 1.67 Y 10.5 9.86 10.3 10.5 6.35 8.38 6.89 9.08 9.11 11.3 7.14 13.4 10.5 Ga 16.8 16.3 16.4 15.9 16.3 16.4 16.4 15.5 16.3 17.8 15.5 19.6 16.7 Cs 1.63 1.18 1.49 1.53 1.41 0.76 0.93 2.13 1.27 1.32 0.68 0.70 1.46 Sn 0.83 0.61 0.77 0.58 0.58 0.64 0.61 0.62 0.67 0.85 0.60 0.56 0.79 Zn 17.4 30.5 28.4 27.7 11.3 8.56 13.4 23.7 38.4 19.4 10.7 6.34 29.5 Sc 1.75 1.92 1.44 1.14 1.29 1.54 1.76 1.16 1.74 1.91 1.25 1.46 1.49 V 3.79 6.54 3.76 4.31 4.75 3.84 5.87 2.73 6.45 6.23 3.06 3.05 4.02 Cr 0.94 1.97 1.31 1.24 1.12 0.47 0.81 0.25 1.68 1.51 0.40 0.41 1.22 Co 0.41 0.72 0.48 0.47 0.44 0.18 0.64 0.14 0.68 0.57 3.30 1.06 0.49 Ni 0.56 1.10 0.63 0.63 0.61 0.38 0.69 0.28 0.80 0.76 0.88 0.63 0.68 Rb/Sr 0.32 0.15 0.30 0.23 0.23 0.24 0.09 0.28 0.17 0.27 0.16 0.46 0.29 稀土元素(10-6) La 4.87 10.0 5.27 6.02 6.46 5.45 7.01 2.84 8.24 6.48 4.24 1.59 5.31 Ce 9.40 18.7 10.1 11.4 12.0 10.2 12.9 5.45 15.1 11.9 7.04 3.28 9.89 Pr 1.08 2.06 1.17 1.33 1.30 1.16 1.44 0.62 1.64 1.33 0.86 0.42 1.16 Nd 3.80 7.30 4.25 4.80 4.65 4.29 5.45 2.46 5.91 4.90 3.22 1.83 4.43 Sm 0.86 1.42 0.99 1.02 0.91 0.94 1.16 0.57 1.19 1.05 0.64 0.63 1.07 Eu 0.28 0.41 0.33 0.33 0.28 0.31 0.39 0.22 0.35 0.29 0.27 0.17 0.31 Gd 1.01 1.23 1.05 1.05 0.81 0.93 0.97 0.62 1.03 1.01 0.64 0.88 1.14 Tb 0.19 0.22 0.20 0.20 0.13 0.16 0.17 0.12 0.19 0.18 0.11 0.20 0.21 Dy 1.35 1.36 1.32 1.35 0.84 1.11 1.01 0.98 1.17 1.29 0.81 1.59 1.35 Ho 0.29 0.30 0.30 0.31 0.17 0.24 0.21 0.27 0.27 0.30 0.19 0.40 0.30 Er 0.99 0.96 0.99 1.00 0.58 0.77 0.66 1.05 0.87 1.04 0.68 1.43 1.02 Tm 0.18 0.15 0.17 0.18 0.12 0.12 0.11 0.19 0.14 0.19 0.13 0.25 0.17 Yb 1.40 1.08 1.25 1.27 0.79 0.90 0.77 1.48 1.05 1.49 1.03 1.93 1.23 Lu 0.22 0.16 0.20 0.19 0.14 0.16 0.12 0.26 0.18 0.27 0.18 0.32 0.20 Eu/Eu* 0.92 0.95 0.99 0.97 1.00 1.01 1.12 1.13 0.97 0.86 1.29 0.70 0.86 (La/Yb)N 2.5 6.6 3.0 3.4 5.9 4.3 6.5 1.4 5.6 3.1 3.0 0.6 3.1 注：TZrn.根据 Boehnke et al. (2013) 的方程计算.
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表 2 荆山花岗岩全岩Sr-Nd同位素组成
Table 2. Sr-Nd isotopic compositions of the Jingshan granites
样品 Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr (87Sr/86Sr)i Sm(10-6) Nd (10-6) 147Sm/144Nd 143Nd/144Nd εNd(t) tDM2 (Ga) 16JS01 123.9 387.8 0.924 7 0.710 889 0.708 8 0.86 3.80 0.136 8 0.511 841 -14.3 2.33 16JS03 95.8 637.9 0.434 6 0.709 488 0.708 5 1.42 7.30 0.117 6 0.511 833 -14.1 2.28 16JS07 144.8 481.7 0.870 0 0.710 503 0.708 5 0.99 4.25 0.140 8 0.511 845 -14.3 2.34 16JS08 121.2 531.4 0.660 0 0.710 071 0.708 6 1.02 4.80 0.128 4 0.511 844 -14.1 2.30 16JS11 107.0 468.5 0.660 9 0.710 005 0.708 5 0.91 4.65 0.118 3 0.511 863 -13.5 2.24 16JS14 109.7 452.2 0.702 0 0.710 174 0.708 6 0.94 4.29 0.132 4 0.511 876 -13.5 2.26 16JS16 69.3 729.9 0.274 7 0.708 665 0.708 0 1.16 5.45 0.128 7 0.511 765 -15.6 2.43 16JS19 112.3 404.1 0.804 3 0.710 618 0.708 8 0.57 2.46 0.140 1 0.511 887 -13.5 2.27 16JS20 91.7 549.4 0.483 0 0.709 620 0.708 5 1.19 5.91 0.121 7 0.511 832 -14.2 2.30 16JS23 126.9 477.8 0.768 6 0.710 069 0.708 3 1.05 4.90 0.129 5 0.511 833 -14.3 2.32 16JS24 85.2 539.4 0.457 1 0.709 286 0.708 2 0.64 3.22 0.120 1 0.511 819 -14.4 2.31 16JS28 106.0 229.2 1.338 7 0.712 163 0.709 1 0.63 1.83 0.208 1 0.511 910 -14.4 2.19 注：初始Sr-Nd同位素组成计算到t=161 Ma.
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表 3 荆山花岗岩LA-ICPMS锆石U-Pb同位素组成
Table 3. LA-ICPMS zircon U-Pb isotope data for the Jingshan granites
分析点 元素含量(10-6) Th/U 同位素比值 同位素年龄(Ma) Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 16JS16 1 16.32 124 404 0.31 0.049 4 0.002 4 0.171 0.007 0.025 0 0.000 3 160 6 159 2 2 6.58 37 275 0.13 0.049 9 0.002 8 0.170 0.009 0.024 8 0.000 3 159 8 158 2 3 18.97 241 697 0.35 0.049 3 0.002 0 0.169 0.005 0.025 0 0.000 3 159 4 159 2 4 24.83 270 1 012 0.27 0.049 4 0.001 8 0.172 0.006 0.025 1 0.000 3 161 5 160 2 5 51.89 342 1 327 0.26 0.045 2 0.002 0 0.172 0.005 0.025 1 0.000 2 161 4 160 1 6 16.21 73 521 0.14 0.050 1 0.002 4 0.170 0.005 0.025 2 0.000 3 159 4 160 2 7 10.56 54 459 0.12 0.046 1 0.002 2 0.172 0.006 0.025 2 0.000 3 161 5 160 2 8 16.02 114 375 0.3 0.048 5 0.002 0 0.170 0.006 0.025 2 0.000 3 159 5 161 2 9 27.84 179 750 0.24 0.049 7 0.001 9 0.172 0.004 0.025 2 0.000 2 161 4 161 1 10 23.58 122 696 0.18 0.047 2 0.002 0 0.171 0.005 0.025 2 0.000 2 161 4 161 2 11 18.92 129 801 0.16 0.049 2 0.002 0 0.172 0.007 0.025 3 0.000 2 161 6 161 2 12 13.86 63 446 0.14 0.049 1 0.002 1 0.171 0.006 0.025 3 0.000 2 160 5 161 1 13 27.02 59 649 0.09 0.049 7 0.002 4 0.173 0.005 0.025 4 0.000 3 162 5 162 2 14 22.83 240 396 0.61 0.050 4 0.002 3 0.174 0.006 0.025 4 0.000 3 163 5 162 2 15 18.14 67 603 0.11 0.049 2 0.001 6 0.172 0.005 0.025 4 0.000 2 161 5 162 1 16 23.13 100 677 0.15 0.049 8 0.003 5 0.173 0.008 0.025 4 0.000 2 162 7 162 2 17 17.70 122 697 0.18 0.048 6 0.001 5 0.172 0.007 0.025 5 0.000 4 161 6 162 2 18 30.21 181 826 0.22 0.047 6 0.001 5 0.173 0.004 0.025 6 0.000 2 162 3 163 2 19 8.35 34 288 0.12 0.046 7 0.002 9 0.226 0.015 0.0329 0.001 2 207 12 209 8 20 13.52 9 163 0.06 0.050 5 0.002 8 0.229 0.013 0.033 2 0.000 4 209 10 211 3 21 10.54 12 313 0.04 0.051 2 0.001 8 0.234 0.008 0.033 7 0.000 3 214 6 213 2 22 26.80 118 533 0.22 0.056 9 0.003 7 0.240 0.018 0.034 8 0.001 8 219 15 221 11 23 18.70 53 562 0.09 0.047 8 0.002 4 0.253 0.013 0.035 9 0.000 9 229 11 228 6 24 37.34 80 124 0.65 0.066 4 0.002 5 1.145 0.034 0.126 4 0.001 3 775 16 767 7 25 39.48 188 214 0.88 0.065 8 0.002 3 1.172 0.029 0.128 8 0.001 4 788 13 781 8 26 165.15 30 564 0.05 0.110 2 0.002 5 4.835 0.099 0.316 9 0.003 8 1 791 17 1 774 19 27 113.03 53 347 0.15 0.109 1 0.002 2 4.869 0.114 0.321 8 0.003 9 1 797 20 1 799 19 16JS20 1 35.47 173 1 406 0.12 0.049 9 0.001 3 0.170 0.004 0.024 8 0.000 2 160 3 158 1 2 20.50 77 841 0.09 0.049 7 0.001 9 0.171 0.005 0.025 0 0.000 2 160 4 159 1 3 26.60 129 1 181 0.11 0.050 0 0.001 1 0.172 0.004 0.025 1 0.000 2 161 3 160 1 4 19.84 62 896 0.07 0.049 2 0.002 4 0.169 0.006 0.025 2 0.000 3 159 5 160 2 5 27.49 101 1 081 0.09 0.049 5 0.001 9 0.172 0.004 0.025 2 0.000 3 161 4 160 2 6 42.62 352 1 785 0.20 0.050 3 0.001 1 0.173 0.004 0.025 3 0.000 2 162 3 161 1 7 21.67 93 954 0.10 0.049 0 0.001 5 0.173 0.004 0.025 3 0.000 2 162 4 161 1 8 20.86 98 933 0.10 0.047 4 0.002 0 0.171 0.006 0.025 4 0.000 3 161 5 162 2 9 17.01 72 762 0.09 0.049 1 0.001 8 0.176 0.006 0.025 7 0.000 3 150 85 164 5 10 16.71 71 741 0.10 0.048 1 0.001 8 0.175 0.006 0.025 8 0.000 3 102 87 164 5 11 37.11 191 1 556 0.12 0.049 2 0.005 6 0.174 0.020 0.025 6 0.000 3 167 300 163 17 12 26.90 133 1 162 0.11 0.047 0 0.002 1 0.173 0.006 0.025 9 0.000 3 50 104 162 5 13 25.19 104 968 0.11 0.049 5 0.001 4 0.178 0.005 0.026 2 0.000 3 172 65 166 4 14 11.00 108 401 0.27 0.050 6 0.002 1 0.184 0.008 0.026 5 0.000 4 220 98 171 7 15 15.14 51 569 0.09 0.050 2 0.001 8 0.228 0.008 0.032 7 0.000 7 209 7 208 4 16 6.57 30 200 0.15 0.050 0 0.004 8 0.246 0.023 0.035 6 0.000 6 224 19 225 4 17 11.51 31 304 0.10 0.050 3 0.002 5 0.260 0.012 0.037 3 0.000 7 234 9 236 4
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表 4 荆山花岗岩锆石微量组成
Table 4. Zircon trace element compositions for the Jingshan granites
分析点 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Ti (10-6) TTi (℃) 16JS16 1 0.004 17.15 0.03 0.69 2.45 1.68 20.21 8.38 120.31 54.79 284.46 67.01 726.76 151.29 8.26 749 2 0.003 5.76 0.01 0.15 0.93 0.62 9.06 4.01 68.60 31.93 197.45 48.51 668.30 135.27 6.84 731 3 0.069 30.19 0.09 1.10 3.68 2.30 29.15 11.91 177.24 75.17 408.58 90.02 1 117.26 201.44 10.1 768 4 0.037 19.94 0.36 0.40 2.26 1.74 22.15 10.00 162.25 70.83 401.68 89.61 1 122.54 204.77 6.44 726 5 22.32 0.02 0.49 2.79 1.48 26.33 11.96 177.45 80.54 418.65 98.19 1 085.16 215.14 6.66 729 6 0.011 12.53 0.01 0.18 2.02 0.91 14.99 7.40 116.75 59.45 332.48 82.90 948.88 201.82 2.84 657 7 0.005 11.69 0.02 0.45 1.19 0.87 13.16 6.74 122.84 59.50 366.01 84.88 1 108.33 206.94 6.17 722 8 14.84 0.02 0.56 2.34 1.54 17.15 6.94 103.43 46.27 235.93 57.04 623.38 129.37 10.3 770 9 15.83 0.01 0.32 1.86 1.28 18.47 8.18 125.72 58.41 310.41 74.26 817.68 169.72 4.46 694 10 16.47 0.01 0.40 2.05 1.28 23.79 10.83 171.98 82.45 439.68 105.80 1 166.27 242.12 5.05 704 11 0.047 13.47 0.02 0.25 1.48 0.87 16.10 7.73 129.55 60.44 361.78 82.61 1 056.97 195.58 3.91 683 12 0.007 10.87 0.03 0.32 1.06 0.86 14.11 6.84 107.11 53.72 302.33 75.65 862.62 184.44 3.72 679 13 0.016 8.89 0.03 0.24 0.89 0.52 11.18 5.28 88.59 45.68 265.74 68.50 813.51 177.25 3.4 671 14 28.75 0.06 1.77 4.33 2.62 28.36 9.98 131.59 52.96 255.05 55.91 592.74 118.97 12.8 792 15 0.12 6.22 0.10 0.53 0.35 5.79 3.37 54.36 27.51 158.08 41.57 498.34 110.96 7.2 736 16 1.13 18.75 0.24 1.28 1.96 1.07 19.73 9.74 154.86 74.28 401.95 97.68 1 106.13 225.11 18 828 17 12.44 0.01 0.33 1.29 0.80 13.17 6.13 98.16 45.11 269.34 63.25 826.06 155.13 4.88 701 18 0.079 13.68 0.06 0.34 1.52 1.13 16.02 7.37 106.62 48.18 257.21 60.91 654.92 134.00 1.91 627 19 0.035 8.32 0.01 0.19 1.42 0.94 10.68 5.37 97.85 46.66 284.48 66.28 875.98 169.83 6 719 20 0.019 10.88 0.00 0.16 0.22 0.28 2.22 0.72 10.85 5.56 30.40 8.88 123.27 32.96 4.2 689 21 7.29 0.01 0.14 0.73 0.20 2.43 1.01 15.45 7.87 48.28 13.85 184.95 48.13 1.55 612 22 0.003 15.08 0.03 0.73 2.43 1.40 20.01 8.99 136.17 63.69 335.60 81.37 894.67 185.28 8.22 748 23 0.16 5.20 0.02 0.33 0.59 0.52 2.58 0.58 5.18 1.45 5.40 0.91 8.33 1.24 7.08 734 24 0.03 20.76 0.19 4.36 9.86 0.35 48.92 16.98 210.41 81.52 357.56 69.79 637.73 113.79 3.43 672 25 0.01 50.56 0.04 1.13 3.12 0.64 19.98 7.27 103.92 40.76 213.13 44.68 532.25 89.54 5.98 719 26 0.013 1.58 0.02 0.53 1.12 0.48 8.35 2.95 32.89 10.63 49.29 10.12 119.20 21.64 9.24 759 27 0.56 12.01 0.00 0.16 0.63 0.12 5.13 2.58 41.07 16.86 91.54 21.04 277.47 48.52 13.80 800 16JS20 1 0.30 12.07 0.07 0.19 0.87 0.51 10.43 5.18 95.20 46.64 301.00 76.88 1 084.57 214.03 2.56 649 2 0.024 11.88 0.14 0.22 0.82 0.46 11.24 6.00 115.48 60.53 404.53 102.58 1 456.11 285.11 2.94 660 3 0.01 20.40 0.08 0.37 1.50 0.67 17.55 9.61 186.62 94.95 613.97 150.87 2 076.06 396.21 4.14 687 4 0.003 7.82 0.01 0.14 0.45 0.29 6.47 3.78 78.37 42.96 302.98 83.56 1 241.89 258.58 2.54 648 5 0.002 14.47 0.07 0.17 0.85 0.68 14.06 7.78 145.37 74.44 492.53 125.33 1 764.10 345.27 2.76 655 6 0.013 21.30 0.06 0.23 1.48 0.90 18.99 8.76 156.48 74.32 457.07 110.18 1 488.69 282.11 4.32 691 7 0.051 13.68 0.01 0.28 1.05 0.55 13.34 6.99 135.92 70.04 460.75 116.25 1 633.18 318.52 4.34 691 8 18.45 0.00 0.31 1.32 0.67 15.34 7.94 156.29 78.78 510.17 125.73 1 730.65 330.98 4.88 701 9 0.007 11.63 0.00 0.57 0.82 0.48 10.80 5.95 115.89 59.67 386.27 97.86 1 344.44 261.62 4.97 703 10 12.92 0.01 0.20 0.84 0.51 10.64 5.56 104.38 54.80 362.23 92.40 1 305.38 254.98 3.70 678 11 24.45 0.79 0.21 1.34 0.88 19.81 10.22 190.23 96.75 620.25 151.08 2 072.94 389.43 2.98 661 12 0.002 21.19 0.01 0.27 1.66 0.82 18.18 9.89 192.32 96.84 623.40 152.83 2 091.64 399.80 3.52 674 13 0.002 17.12 0.02 0.36 1.08 0.74 16.64 8.86 165.67 82.82 532.05 131.57 1 774.10 338.29 4.48 694 14 18.48 0.02 0.48 1.97 1.47 22.40 10.05 163.38 71.16 414.32 94.72 1 230.95 231.86 7.70 742 15 11.62 0.13 0.70 0.43 5.74 2.87 53.45 26.65 167.31 41.17 566.53 107.57 5.04 704 16 0.004 13.99 0.01 0.20 0.53 0.42 3.20 1.33 21.55 9.85 62.80 16.07 230.76 44.66 2.20 637 17 0.018 29.00 0.07 1.02 3.31 0.97 13.88 5.03 72.43 28.59 157.47 35.06 458.41 85.16 8.38 750 注：TTi.据Ferry and Watson (2007)的公式计算，取a=0.8，a=1.
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表 5 荆山花岗岩锆石Hf同位素组成
Table 5. Zircon Hf isotope compositions of the Jingshan granites
分析点 206Pb/238U年龄(Ma) 1σ 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(t) 2σ tDM1 (Ma) 2σ tDM2(Ma) 2σ 16JS20-01 158 1 0.057 874 0.001 602 0.002 407 0.000 051 0.282 207 0.000 025 -16.8 0.89 1 530 36 2 260 56 16JS20-02 159 1 0.068 272 0.002 519 0.003 018 0.000 094 0.282 370 0.000 027 -11.0 0.96 1 316 40 1 901 61 16JS20-03 160 1 0.045 279 0.005 369 0.001 909 0.000 204 0.282 261 0.000 025 -14.8 0.89 1 432 37 2 136 60 16JS20-04 160 2 0.067 961 0.004 253 0.002 829 0.000 177 0.282 412 0.000 039 -9.5 1.38 1 247 58 1 806 89 16JS20-05 160 2 0.085 857 0.004 569 0.003 589 0.000 119 0.282 275 0.000 026 -14.4 0.92 1 480 39 2 115 59 16JS20-06 161 1 0.006 559 0.000 122 0.000 278 0.000 005 0.282 309 0.000 029 -12.9 1.03 1 306 40 2 018 65 16JS20-07 161 1 0.022 949 0.002 044 0.000 987 0.000 075 0.282 337 0.000 024 -12.0 0.85 1 291 34 1 961 54 16JS20-08 162 2 0.044 757 0.006 359 0.001 742 0.000 226 0.282 306 0.000 026 -13.1 0.92 1 362 38 2 034 63 16JS20-09 164 5 0.038 666 0.002 234 0.001 717 0.000 088 0.282 022 0.000 029 -23.1 1.05 1 764 41 2 661 65 16JS20-10 164 5 0.038 505 0.002 247 0.001 676 0.000 077 0.282 180 0.000 024 -17.5 0.87 1 538 34 2 312 54 16JS20-11 163 17 0.052 929 0.001 017 0.002 140 0.000 037 0.282 180 0.000 029 -17.6 1.24 1 558 42 2 315 67 16JS20-12 162 5 0.049 235 0.004 939 0.001 890 0.000 187 0.282 064 0.000 029 -21.7 1.05 1 712 42 2 571 69 16JS20-13 166 4 0.030 718 0.004 414 0.001 369 0.000 168 0.282 098 0.000 046 -20.3 1.64 1 641 65 2 490 104 16JS20-14 171 7 0.064 921 0.002 285 0.002 896 0.000 087 0.282 207 0.000 036 -16.6 1.30 1 551 53 2 256 81 16JS20-15 208 4 0.036 156 0.001 921 0.001 611 0.000 077 0.282 253 0.000 026 -14.0 0.94 1 432 37 2 124 59 16JS20-16 225 3 0.092 642 0.006 428 0.003 697 0.000 188 0.282 306 0.000 036 -12.1 1.28 1 438 55 2 016 83 16JS20-17 236 4 0.017 339 0.001 306 0.000 773 0.000 059 0.282 353 0.000 025 -9.8 0.90 1 262 35 1 878 56
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