Petrogenesis and Geological Significance of Early Cretaceous Granites in Tajigang Mining Area, Central Tibet
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摘要: 塔吉冈铜多金属矿位于南羌塘地块的南缘，是认识班公湖-怒江成矿带构造-岩浆-成矿作用的理想窗口.以塔吉冈铜多金属矿区内出露的花岗岩为研究对象，对其进行了系统的锆石U-Pb定年、全岩地球化学和锆石原位Hf同位素研究.结果显示塔吉冈花岗岩形成于早白垩世晚期（120~118 Ma），岩石地球化学具有高SiO2、高碱（Na2O+K2O）、低P2O5的特征，铝饱和指数（A/CNK）为0.78~1.02，整体显示偏铝质钙碱性Ⅰ型花岗岩的特征.塔吉冈花岗岩具有正的锆石εHf（t）值（+3.9~+7.2）、年轻的地壳模式年龄（TDMC=717~926 Ma）以及与陆壳相似的Zr/Hf（26.88~38.65）、Nb/Ta（7.01~13.61）、Sm/Nd（0.17~0.21）、Nb/La（0.32~0.58）等特征元素比值，指示其起源于新生的火成岩下地壳部分熔融.对比研究区域地质资料，塔吉冈花岗岩形成于拉萨与南羌塘地块碰撞的构造背景，并显示与区域同时期成矿相关岩体一致的地球化学与同位素组成，均为西藏中部新生下地壳部分熔融的产物.考虑到新生地壳通常富含铜金等金属元素，研究提出西藏中部大规模发育的新生地壳熔融成因的花岗岩体具有一定的成矿条件，是今后寻找斑岩型铜金矿重点勘查方向.Abstract: Tajigang copper polymetallic ore is located in the south margin of southern Qiangtang terrane, providing an ideal window for understanding the tectonic-magmatic activities and mineralization of Bangong Co-Nujiang metallogenic belt. In this paper, it focuses on the granites in Tajigang mining area and reports their zircon U-Pb ages, geochemical and zircon Hf isotopic data. These granite rocks were dated as Early Cretaceous (120-118 Ma) and characterized by high SiO2, total alkali (Na2O+K2O), and low P2O5 contents, with aluminum saturation index (A/CNK) of 0.78-1.02, suggesting geochemical affinity to calc alkaline Ⅰ-type granite. Furthermore, the granites display positive εHf(t) values (+3.9-+7.2) with relatively young crustal model age (TDMC=717-926 Ma) and show similar Zr/Hf (26.88-38.65), Nb/Ta (7.01-13.61), Sm/Nd (0.17-0.21), and Nb/La (0.32-0.58) ratios to crust, indicating a magma source of juvenile igneous lower crust. Together with data from the recent literature, it proposes that the Tajigang granites formed in a collision setting of Lhasa and southern Qiangtang terranes. In addition, the Tajigang granites show similar geochemical and isotopic compositions with the regional simultaneous metallogenic related rocks which were derived by partial melting of juvenile lower crust. In general, the juvenile crust was enriched in Cu, Au and other elements. Thus, our research proposes that these widely exposed juvenile-crust derived granitic rocks of central Tibet have certain metallogenic conditions and are the key exploration direction for prospecting porphyry Cu-Au deposits in the future.
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图 1 班公湖-怒江成矿带主要矿床（点）分布(a)；塔吉冈矿区地质简图(b)
1.第四系；2.康托组；3.沙木罗组；4.布曲组；5.早白垩世花岗岩类；6.中晚侏罗世花岗岩类；7.蛇绿混杂岩带；8.班公湖-怒江缝合带；9.矿床点；10.塔吉冈铜多金属矿及采样位置
Fig. 1. Distribution of major ore deposits (spots) in the Bangong Co-Nujiang metallogenic belt (a); simplified geological map of the Tajigang mining area, Tibet (b)
图 2 塔吉冈矿区花岗岩野外露头及镜下照片
Qz.石英；Kfs.碱性长石；Pl.斜长石；Hb.角闪石；Bt.黑云母
Fig. 2. Field photos and petrographic photographs of granites in Tajigang mining area
图 3 塔吉冈矿区花岗岩典型锆石阴极发光（CL）图像及206Pb/238U年龄
Fig. 3. Cathodoluminescence(CL) images of representative zircons from granites in Tajigang mining area, showing the dated 206Pb/238U ages
图 4 塔吉冈矿区花岗岩锆石U-Pb谐和图
Fig. 4. Zircon U-Pb concordia diagrams of granites in Tajigang mining area
图 5 塔吉冈矿区花岗岩（a）TAS图解；（b）A/NK-A/CNK图解；（c）K2O-SiO2图解
Fig. 5. TAS diagram (a); A/NK-A/CNK diagram (b); K2O-SiO2 diagram (c) of granites in Tajigang mining area
图 6 塔吉冈矿区花岗岩稀土配分模式图(a)；微量元素蛛网图(b)（底图据Sun and McDonough, 1989）
Fig. 6. Chondrite-normalized REE pattern (a); primitive mantle-normalized trace element diagram (b)
图 7 塔吉冈矿区花岗岩地球化学分类判别图解
Fig. 7. Geochemical classification diagrams of granites in Tajigang mining area
图 8 锆石Hf同位素εHf(t)-年龄（Ma）图解(a); 176Hf/177Hf-年龄（Ma）图解(b)
Fig. 8. Zircon Hf isotopic εHf(t)-age(Ma) diagram (a); 176Hf/177Hf-age(Ma) diagram (b)
图 9 Rb/30-Hf-Ta*3构造判别图解(a)；Rb/10-Hf-Ta*3构造判别图解(b)；Rb-(Yb+Ta)构造判别图解(c)；Al2O3-SiO2构造判别图解(d)
Fig. 9. Rb/30-Hf-Ta*3 diagram (a); Rb/10-Hf-Ta*3 diagram (b); Rb-(Yb+Ta) diagram (c); Al2O3-SiO2 diagram (d)
表 1 LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. LA-ICP-MS zircon isotopic U-Th-Pb analysis results
测点 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 TJG2001-01 219 433 0.51 0.047 8 0.003 4 0.120 8 0.008 1 0.018 4 0.000 3 87 168 116 7 118 2 TJG2001-02 213 533 0.40 0.049 3 0.003 0 0.124 7 0.006 7 0.018 7 0.000 3 161 146 119 6 120 2 TJG2001-04 316 694 0.45 0.050 7 0.002 8 0.130 1 0.007 0 0.018 6 0.000 2 228 126 124 6 119 1 TJG2001-05 200 468 0.43 0.047 4 0.003 1 0.121 0 0.007 2 0.018 7 0.000 3 78 142 116 7 120 2 TJG2001-06 320 668 0.48 0.048 7 0.002 3 0.123 3 0.005 8 0.018 3 0.000 3 132 111 118 5 117 2 TJG2001-07 306 595 0.51 0.052 5 0.003 7 0.128 9 0.008 9 0.017 7 0.000 3 306 130 123 8 113 2 TJG2001-08 346 745 0.46 0.048 4 0.002 4 0.120 2 0.005 7 0.018 0 0.000 2 117 111 115 5 115 2 TJG2001-10 343 765 0.45 0.048 5 0.002 9 0.120 8 0.006 8 0.018 1 0.000 2 120 137 116 6 116 2 TJG2001-11 312 671 0.46 0.046 9 0.002 7 0.121 9 0.006 8 0.018 9 0.000 3 43 133 117 6 121 2 TJG2001-12 214 592 0.36 0.047 2 0.002 8 0.122 6 0.007 0 0.018 7 0.000 3 58 137 117 6 120 2 TJG2001-13 41.0 89.9 0.46 0.049 8 0.008 8 0.109 0 0.012 4 0.018 2 0.000 6 187 363 105 11 116 4 TJG2001-14 271 631 0.43 0.050 1 0.002 8 0.128 9 0.005 7 0.018 6 0.000 3 198 130 123 5 119 2 TJG2001-15 249 603 0.41 0.051 6 0.002 7 0.130 7 0.006 5 0.018 3 0.000 3 333 120 125 6 117 2 TJG2001-16 307 709 0.43 0.050 1 0.002 7 0.130 1 0.007 5 0.018 5 0.000 3 198 128 124 7 118 2 TJG2001-17 276 667 0.41 0.049 5 0.003 5 0.122 3 0.008 3 0.017 9 0.000 3 169 159 117 8 114 2 TJG2001-18 257 611 0.42 0.048 5 0.003 6 0.125 0 0.007 9 0.018 8 0.000 3 124 176 120 7 120 2 TJG2001-19 260 628 0.41 0.051 6 0.002 9 0.132 6 0.006 7 0.018 6 0.000 3 333 97 126 6 119 2 TJG2001-20 116 291 0.40 0.049 9 0.005 0 0.125 0 0.009 7 0.018 6 0.000 4 191 218 120 9 119 3 TJG2001-03 220 584 0.38 0.043 1 0.003 2 0.113 0 0.007 8 0.019 0 0.000 3 error 109 7 121 2 TJG2001-09 224 367 0.61 0.067 7 0.005 3 0.169 7 0.010 6 0.018 7 0.000 4 861 165 159 9 120 2 TJG2011-01 167 455 0.37 0.046 8 0.003 1 0.125 0 0.008 1 0.019 3 0.000 3 39 152 120 7 123 2 TJG2011-02 159 428 0.37 0.050 8 0.003 2 0.135 3 0.008 2 0.019 3 0.000 3 232 144 129 7 123 2 TJG2011-03 246 576 0.43 0.049 6 0.002 8 0.132 6 0.007 0 0.019 3 0.000 3 176 133 126 6 124 2 TJG2011-04 288 685 0.42 0.048 2 0.002 8 0.125 8 0.007 1 0.018 9 0.000 3 109 133 120 6 121 2 TJG2011-05 185 362 0.51 0.047 9 0.003 3 0.123 9 0.007 9 0.018 7 0.000 3 95 156 119 7 119 2 TJG2011-06 269 604 0.45 0.052 9 0.003 0 0.141 4 0.007 8 0.019 1 0.000 3 324 131 134 7 122 2 TJG2011-07 150 446 0.34 0.048 6 0.003 3 0.125 9 0.008 1 0.018 7 0.000 2 132 152 120 7 120 2 TJG2011-10 98.2 164 0.60 0.050 9 0.005 6 0.122 8 0.010 6 0.018 6 0.000 5 235 237 118 9 119 3 TJG2011-11 370 712 0.52 0.047 1 0.002 7 0.119 4 0.005 9 0.018 3 0.000 3 54 135 115 5 117 2 TJG2011-12 224 603 0.37 0.049 4 0.002 9 0.128 8 0.007 1 0.018 6 0.000 3 165 137 123 6 119 2 TJG2011-13 304 632 0.48 0.053 2 0.003 0 0.137 2 0.007 0 0.018 9 0.000 3 345 126 131 6 120 2 TJG2011-14 215 512 0.42 0.049 4 0.003 2 0.127 9 0.007 5 0.018 7 0.000 3 165 150 122 7 119 2 TJG2011-15 234 611 0.38 0.048 7 0.003 0 0.126 5 0.007 1 0.018 8 0.000 3 200 76 121 6 120 2 TJG2011-16 248 630 0.39 0.047 0 0.003 2 0.124 9 0.006 6 0.019 3 0.000 2 56 156 119 6 123 2 TJG2011-17 164 494 0.33 0.049 3 0.003 1 0.122 4 0.006 7 0.018 1 0.000 3 165 148 117 6 115 2 TJG2011-18 182 510 0.36 0.053 3 0.003 2 0.139 0 0.007 9 0.018 9 0.000 3 343 137 132 7 121 2 TJG2011-19 309 726 0.43 0.050 6 0.003 0 0.131 9 0.006 9 0.018 8 0.000 3 233 135 126 6 120 2 TJG2011-08 351 551 0.64 0.060 0 0.003 5 0.161 8 0.008 9 0.019 4 0.000 3 606 125 152 8 124 2 TJG2011-09 236 528 0.45 0.064 2 0.003 7 0.177 3 0.009 7 0.020 1 0.000 3 746 121 166 8 128 2 TJG2011-20 185 493 0.37 0.070 3 0.005 4 0.182 5 0.013 7 0.018 8 0.000 3 1000 159 170 12 120 2 
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表 2 锆石Hf同位素特征
Table 2. Zircon Hf isotopic data
测点 年龄（Ma） 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ 176Hf/177Hfi εHf(0) εHf(t) 2σ TDM (Ma) TDMC(Ma) fLu/Hf TJG2001-01 118 0.043 581 0.000 400 0.001 315 0.000 011 0.282 902 0.000 016 0.282 899 4.6 7.1 0.6 501 724 -0.96 TJG2001-02 120 0.040 377 0.000 498 0.001 182 0.000 014 0.282 831 0.000 013 0.282 828 2.1 4.6 0.5 600 882 -0.96 TJG2001-04 119 0.030 224 0.000 074 0.000 920 0.000 001 0.282 858 0.000 013 0.282 856 3.0 5.6 0.5 558 820 -0.97 TJG2001-06 117 0.035 192 0.000 323 0.001 077 0.000 007 0.282 837 0.000 013 0.282 834 2.3 4.8 0.5 591 871 -0.97 TJG2001-07 113 0.082 175 0.003 128 0.002 532 0.000 100 0.282 843 0.000 014 0.282 838 2.5 4.8 0.5 604 864 -0.92 TJG2001-08 115 0.030 396 0.000 194 0.000 927 0.000 005 0.282 825 0.000 012 0.282 823 1.9 4.3 0.4 604 896 -0.97 TJG2001-10 116 0.028 312 0.000 174 0.000 872 0.000 004 0.282 855 0.000 012 0.282 854 3.0 5.4 0.4 561 827 -0.97 TJG2001-12 120 0.032 883 0.000 186 0.001 010 0.000 004 0.282 865 0.000 013 0.282 862 3.3 5.8 0.4 550 805 -0.97 TJG2001-13 116 0.025 869 0.000 379 0.000 814 0.000 007 0.282 824 0.000 016 0.282 822 1.8 4.3 0.6 604 898 -0.98 TJG2001-14 119 0.031 931 0.000 176 0.000 963 0.000 005 0.282 848 0.000 013 0.282 846 2.7 5.2 0.5 573 844 -0.97 TJG2001-15 117 0.027 879 0.000 439 0.000 845 0.000 012 0.282 840 0.000 013 0.282 838 2.4 4.9 0.5 582 861 -0.97 TJG2001-16 118 0.028 586 0.000 076 0.000 873 0.000 001 0.282 840 0.000 014 0.282 838 2.4 4.9 0.5 583 861 -0.97 TJG2001-17 114 0.042 179 0.000 090 0.001 248 0.000 003 0.282 836 0.000 013 0.282 833 2.3 4.7 0.5 595 875 -0.96 TJG2001-18 120 0.032 013 0.000 293 0.000 950 0.000 009 0.282 847 0.000 011 0.282 845 2.7 5.2 0.4 574 844 -0.97 TJG2001-19 119 0.026 675 0.000 221 0.000 816 0.000 005 0.282 816 0.000 013 0.282 814 1.5 4.1 0.4 616 915 -0.98 TJG2011-02 123 0.025 809 0.000 087 0.000 784 0.000 002 0.282 867 0.000 012 0.282 865 3.3 6.0 0.4 544 797 -0.98 TJG2011-03 124 0.029 762 0.000 098 0.000 911 0.000 001 0.282 852 0.000 013 0.282 850 2.8 5.5 0.5 566 830 -0.97 TJG2011-04 121 0.028 860 0.000 051 0.000 910 0.000 001 0.282 903 0.000 014 0.282 901 4.6 7.2 0.5 494 717 -0.97 TJG2011-05 119 0.034 666 0.000 482 0.001 047 0.000 013 0.282 864 0.000 015 0.282 861 3.2 5.8 0.5 552 808 -0.97 TJG2011-06 122 0.028 907 0.000 394 0.000 877 0.000 010 0.282 841 0.000 013 0.282 839 2.4 5.0 0.4 581 856 -0.97 TJG2011-07 120 0.022 866 0.000 103 0.000 712 0.000 003 0.282 837 0.000 014 0.282 835 2.3 4.9 0.5 585 867 -0.98 TJG2011-10 119 0.038 942 0.000 615 0.001 182 0.000 016 0.282 883 0.000 014 0.282 880 3.9 6.4 0.5 526 765 -0.96 TJG2011-11 117 0.037 782 0.000 726 0.001 126 0.000 020 0.282 857 0.000 012 0.282 855 3.0 5.5 0.4 562 824 -0.97 TJG2011-12 119 0.028 968 0.000 111 0.000 899 0.000 002 0.282 878 0.000 013 0.282 876 3.7 6.3 0.5 529 775 -0.97 TJG2011-13 120 0.028 321 0.000 409 0.000 881 0.000 009 0.282 864 0.000 014 0.282 862 3.3 5.8 0.5 548 804 -0.97 TJG2011-14 119 0.057 139 0.000 836 0.001 707 0.000 027 0.282 871 0.000 014 0.282 867 3.5 6.0 0.5 552 795 -0.95 TJG2011-15 120 0.036 214 0.000 435 0.001 096 0.000 011 0.282 835 0.000 012 0.282 832 2.2 4.8 0.4 594 873 -0.97 TJG2011-16 123 0.025 400 0.000 126 0.000 787 0.000 003 0.282 859 0.000 012 0.282 858 3.1 5.7 0.4 554 814 -0.98 TJG2011-18 121 0.021 834 0.000 180 0.000 687 0.000 004 0.282 811 0.000 015 0.282 810 1.4 4.0 0.5 620 923 -0.98 TJG2011-20 120 0.026 859 0.000 070 0.000 821 0.000 003 0.282 811 0.000 012 0.282 809 1.4 3.9 0.4 623 926 -0.98
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表 3 花岗岩全岩主量（%）、微量（10-6）和稀土元素（10-6）分析结果
Table 3. Major, trace and rare earth element data of granites
样品编号 TJG2001 TJG2002 TJG2003 TJG2004 TJG2005 TJG2006 TJG2007 TJG2008 TJG2009 SiO2 73.19 71.18 70.49 71.17 70.88 74.12 77.18 75.95 76.30 TiO2 0.19 0.28 0.33 0.26 0.29 0.31 0.10 0.13 0.13 Al2O3 14.65 15.14 15.03 15.07 14.39 12.83 12.15 12.52 12.46 Fe2O3T 0.71 1.91 2.24 1.79 1.02 2.26 0.52 1.05 1.00 MnO 0.01 0.02 0.03 0.02 0.02 0.03 0.01 0.01 0.01 MgO 0.26 0.43 0.55 0.44 0.57 0.52 0.11 0.19 0.18 CaO 1.77 1.83 1.91 1.88 2.22 1.07 0.63 0.74 0.66 Na2O 3.91 4.30 4.14 4.47 4.19 3.38 2.76 2.75 2.73 K2O 4.99 4.08 4.17 4.26 4.64 4.91 5.86 6.05 6.02 P2O5 0.05 0.07 0.09 0.07 0.07 0.07 0.02 0.03 0.03 LOI 0.44 0.43 0.61 0.44 1.43 0.48 0.31 0.45 0.45 SUM 100.17 99.69 99.59 99.86 99.71 99.99 99.64 99.88 99.96 Na2O+K2O 8.89 8.39 8.31 8.73 8.83 8.29 8.62 8.81 8.74 Mg# 45 34 36 36 56 35 32 30 30 Li 21.83 44.63 33.79 41.03 24.80 41.58 19.29 23.46 21.73 Be 5.54 5.24 4.49 5.19 5.95 5.76 5.27 6.53 6.60 Sc 2.48 3.51 4.37 3.27 5.37 3.71 1.72 2.06 1.82 V 10.85 17.52 21.68 16.31 18.97 19.43 5.09 9.18 8.01 Cr 5.85 5.23 6.93 4.76 5.70 5.41 1.80 2.50 2.34 Co 1.58 1.97 3.19 1.91 5.93 2.88 2.19 5.37 6.24 Ni 2.13 3.18 3.81 3.13 3.37 3.44 1.41 1.84 1.59 Cu 3.67 2.36 22.46 2.34 6.54 2.65 11.29 29.81 30.63 Zn 16.81 26.37 32.77 28.18 59.95 38.37 19.35 17.05 16.87 Ga 21.28 21.71 22.32 22.26 20.87 20.15 18.34 18.71 18.67 Rb 199.93 210.60 158.28 210.40 205.82 254.26 215.95 248.70 248.74 Sr 262.45 198.35 191.97 213.42 386.10 113.08 111.01 112.52 106.54 Y 25.07 27.76 31.76 27.78 43.38 38.18 36.36 24.46 24.92 Zr 171.67 197.93 234.26 201.41 220.20 221.87 91.46 143.85 134.61 Nb 16.45 18.72 21.02 18.66 24.23 21.96 18.45 17.08 16.03 Sn 7.90 3.29 2.35 3.68 7.88 2.52 1.43 1.91 1.76 Cs 8.89 17.72 8.51 16.17 10.46 19.30 7.81 11.64 11.77 Ba 293.84 294.82 315.73 426.43 388.81 167.59 182.54 164.08 161.16 La 32.86 37.37 40.93 35.80 42.86 46.33 31.73 48.14 49.54 Ce 58.87 69.20 73.68 64.47 77.29 84.13 57.05 86.38 91.34 Pr 6.10 7.27 7.88 6.74 8.21 8.77 5.93 8.94 9.41 Nd 20.84 25.27 27.35 23.77 27.57 28.35 19.85 29.04 31.16 Sm 4.06 4.86 5.46 4.39 5.68 5.38 3.96 5.25 5.47 Eu 0.58 0.65 0.70 0.73 0.59 0.42 0.25 0.25 0.29 Gd 3.76 4.49 5.41 4.51 6.20 5.32 3.92 4.34 4.78 Tb 0.72 0.74 0.94 0.86 1.21 1.01 0.89 0.74 0.80 Dy 4.17 4.40 5.35 4.46 7.16 6.14 5.31 4.23 4.34 Ho 0.80 0.95 1.08 0.88 1.51 1.23 1.13 0.78 0.84 Er 2.50 2.77 3.34 2.68 4.46 3.86 3.90 2.48 2.57 Tm 0.38 0.42 0.45 0.41 0.64 0.56 0.60 0.37 0.37 Yb 2.58 2.73 3.14 2.84 4.36 3.81 4.26 2.51 2.64 Lu 0.37 0.39 0.44 0.39 0.58 0.52 0.59 0.38 0.37 Hf 4.68 5.25 6.23 5.60 6.20 6.35 3.40 4.65 4.62 Ta 1.64 1.64 1.87 1.66 2.35 2.11 2.37 2.44 2.27 Tl 0.88 0.81 0.78 0.87 1.18 0.87 0.92 1.15 1.14 Pb 22.09 22.63 55.25 23.85 23.12 22.29 22.04 32.62 32.86 Th 21.69 20.11 21.61 22.57 20.24 21.41 25.03 38.47 40.64 U 3.77 3.33 4.34 3.49 3.80 4.19 3.89 5.31 5.32 Eu* 0.45 0.42 0.39 0.50 0.30 0.24 0.19 0.15 0.17 Zr/Hf 36.65 37.69 37.58 35.96 35.50 34.92 26.88 30.90 29.16 Nb/Ta 10.00 11.39 11.22 11.22 10.32 10.42 7.78 7.01 7.05 Sm/Nd 0.19 0.19 0.20 0.18 0.21 0.19 0.20 0.18 0.18 ∑REE 138.61 161.52 176.15 152.94 188.32 195.83 139.35 193.82 203.94 ∑LREE 123.32 144.63 156.00 135.91 162.19 173.38 118.76 178.01 187.21 ∑HREE 15.29 16.90 20.16 17.03 26.13 22.45 20.59 15.81 16.72 样品编号 TJG2010 TJG2011 TJG2012 TJG2013 TJG2014 TJG2015 TJG2016 TJG2017 SiO2 75.25 71.30 72.07 72.04 71.06 72.12 72.15 70.77 TiO2 0.24 0.39 0.34 0.39 0.39 0.38 0.35 0.39 Al2O3 12.30 14.67 14.38 14.26 14.72 14.15 14.08 14.80 Fe2O3T 1.67 1.68 1.39 2.02 1.74 2.13 1.95 1.67 MnO 0.01 0.01 0.02 0.02 0.01 0.02 0.02 0.01 MgO 0.30 0.60 0.45 0.64 0.63 0.66 0.61 0.65 CaO 0.77 2.21 1.68 2.18 2.24 1.95 1.84 2.28 Na2O 2.66 3.62 3.49 3.41 3.60 3.50 3.48 3.80 K2O 5.83 4.75 5.41 4.64 4.77 4.41 4.54 4.40 P2O5 0.04 0.10 0.08 0.09 0.09 0.10 0.09 0.10 LOI 0.59 0.60 0.52 0.57 0.58 0.74 0.74 0.86 SUM 99.67 99.92 99.83 100.25 99.83 100.15 99.83 99.73 Na2O+K2O 8.49 8.36 8.90 8.04 8.37 7.91 8.01 8.20 Mg# 29 45 43 43 45 42 42 48 Li 29.52 42.74 36.14 50.06 46.57 50.98 50.22 40.36 Be 6.48 4.17 5.06 3.76 4.53 3.91 3.89 4.87 Sc 3.26 4.93 4.39 5.01 5.07 5.44 4.80 5.13 V 14.50 25.77 17.75 29.53 25.82 27.11 26.11 25.68 Cr 4.07 8.25 4.26 8.86 7.19 8.95 8.40 8.69 Co 8.63 3.14 2.87 2.70 2.64 3.79 3.92 4.33 Ni 2.28 7.04 5.69 6.24 6.34 6.11 6.81 8.31 Cu 24.96 24.93 55.55 66.40 37.44 11.73 12.31 18.76 Zn 20.26 48.88 88.35 49.71 57.99 46.13 46.52 26.54 Ga 19.71 20.80 20.55 20.84 21.18 20.02 19.91 20.92 Rb 252.30 176.21 180.79 176.55 174.30 170.91 176.14 174.01 Sr 106.02 262.20 194.01 232.40 252.55 242.82 199.66 256.89 Y 31.27 30.85 36.49 28.09 32.67 30.85 28.57 32.58 Zr 172.55 232.02 237.11 193.49 229.37 214.16 198.37 219.55 Nb 26.98 21.04 21.36 19.66 21.66 20.53 19.25 21.21 Sn 2.65 7.28 3.17 4.47 6.02 5.74 2.75 13.65 Cs 12.29 8.37 6.97 9.60 8.68 8.31 8.40 7.28 Ba 174.23 523.65 506.27 445.13 528.62 381.33 381.46 382.43 La 57.74 38.95 39.50 40.48 38.65 38.53 37.31 44.00 Ce 105.95 71.10 70.78 73.97 71.07 71.14 68.42 81.66 Pr 10.94 7.53 7.51 7.69 7.57 7.59 7.01 8.47 Nd 36.39 25.96 26.45 26.36 25.98 26.07 24.26 29.57 Sm 6.05 5.21 5.51 4.99 5.12 5.30 4.62 5.66 Eu 0.27 0.76 0.59 0.76 0.76 0.67 0.67 0.73 Gd 5.38 4.86 5.44 4.77 4.97 4.93 4.35 5.23 Tb 0.98 0.89 0.98 0.76 0.88 0.89 0.80 0.88 Dy 5.11 4.95 5.70 4.70 5.10 5.06 4.51 5.11 Ho 1.10 1.06 1.16 0.89 1.05 0.98 0.90 1.03 Er 3.22 3.02 3.74 2.89 3.30 3.22 2.81 3.38 Tm 0.48 0.43 0.53 0.41 0.46 0.45 0.41 0.46 Yb 3.20 3.01 3.48 2.57 2.98 2.82 2.74 2.97 Lu 0.47 0.44 0.52 0.39 0.46 0.42 0.39 0.44 Hf 4.98 6.00 6.49 5.30 6.10 5.71 5.32 6.28 Ta 3.39 1.63 2.10 1.44 1.88 1.72 1.69 1.99 Tl 1.11 0.93 0.91 0.98 0.88 0.93 0.94 1.04 Pb 31.35 11.02 12.56 11.91 12.10 13.66 15.03 13.05 Th 35.30 25.23 30.74 24.77 22.56 27.26 24.54 27.13 U 6.34 2.50 3.50 3.80 2.49 2.70 2.49 3.50 Eu* 0.14 0.45 0.33 0.47 0.45 0.39 0.45 0.40 Zr/Hf 34.64 38.65 36.54 36.50 37.62 37.52 37.28 34.95 Nb/Ta 7.95 12.88 10.18 13.61 11.49 11.95 11.40 10.68 Sm/Nd 0.17 0.20 0.21 0.19 0.20 0.20 0.19 0.19 ∑REE 237.27 168.16 171.90 171.64 168.35 168.06 159.20 189.57 ∑LREE 217.34 149.50 150.35 154.27 149.15 149.30 142.28 170.08 ∑HREE 19.94 18.66 21.55 17.37 19.20 18.76 16.92 19.50
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