Geochemistry, chronology and zircon Lu-Hf isotopic characteristics of the volcanic rocks of Yeba Formation in Riduo area on the southern margin of Lhasa massif and their geological significance
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摘要:
拉萨地块南缘日多地区叶巴组火山岩以中酸性熔岩及火山碎屑岩占绝对优势为特征。以墨竹工卡县以东日多地区叶巴组火山岩代表性岩石组合为对象进行了地球化学、LA-ICP-MS锆石U-Pb年龄及锆石Lu-Hf同位素研究。研究结果表明, 叶巴组火山岩具有轻稀土元素富集, 富集大离子亲石元素Rb、Th、K, 亏损高场强元素Nb、Ta、Ti(P、Hf)的地球化学特征。其中, 基性火山岩具低钾、低钛和富钠、富铝的特征, Nb、Zr含量和Th/Y、Th/Yb、Ta/Yb值较高, 而La/Nb值较低, 呈现出大陆地壳组分增加的趋势。中酸性火山岩属中钾-高钾钙碱性系列, 具有低钛、低镁和高铝的特征, 微量元素含量及比值与大陆岛弧安山岩接近。叶巴组火山岩总体地球化学特征与陆缘弧火山岩相似。LA-ICP-MS锆石U-Pb测年获得英安岩和流纹质晶屑凝灰岩206Pb/238U年龄加权平均值分别为176.9±2.3Ma和162.2±3.3Ma, 表明研究区叶巴组酸性火山岩形成于中侏罗世。锆石Hf同位素测试结果显示, εHf(t)值为2.43~11.42, 二阶段模式年龄(tDMC)为482~1065Ma, 暗示叶巴组酸性火山岩源区除新生地壳物质的部分熔融外, 还明显受到古老结晶基底的影响。结合前人研究成果, 认为叶巴组形成于早中侏罗世雅鲁藏布江洋北向俯冲于拉萨地块南缘之下的陆缘弧环境。
Abstract:The volcanic rocks of Yeba Formation in Riduo area on the southern margin of Lhasa massif are characterized by the absolute superiority of intermediate acid lava and pyroclastic rock.In this paper, the authors selected geochemistry, LA-ICP-MS zircon U-Pb geochronology and zircon Lu-Hf isotopes of representative rock combination of Yeba Formation in Riduo area of eastern Mozhugongka County as the study objects.Geochemical analysis shows that the volcanic rocks of the Yeba Formation are characterized by LREE enriched type pattern, enrichment of LILES such as Rb, Th and K, and depletion of HFSE such as Nb, Ta and Ti (P, Hf).The basic volcanic rocks are characterized by low potassium and titanium as well as rich sodium and aluminum.The values of Nb, Zr and ratios of Th/Y, Th/Yb and Ta/Yb are relatively high, but the ratio of La/Nb is relatively low, showing a trend of increasing continental crustal components.The intermediate acid volcanic rocks belong to the middle-high potassium calc alkaline series.They are characterized by low titanium and magnesium as well as high aluminum.The values and ratios of trace elements are close to those of andesite from the continental island arc.The overall geochemical characteristics of the volcanic rocks of the Yeba Formation are similar to features of the continental margin arc volcanic rocks.LA-ICP-MS Zircon U-Pb dating of dacite and rhyolitic crystal tuff yielded 206Pb/238U weighted average ages of 176.9±2.3Ma and 162.2±3.3Ma, showing that acidic volcanic rocks of Yeba Formation in the study area were formed in Middle Jurassic.Zircon Hf isotope analytical results show that the values of εHf(t) range from 2.43 to 11.42, and the values of tDMC range from 482Ma to 1065Ma, suggesting that the source area of the acid volcanic rocks of Yeba Formation was affected not only by the partial melting of the new crustal material but also by the ancient crystallization basement.Combined with previous research results, the authors hold that the volcanic rocks of Yeba Formation was formed in a tectonic setting of continental arc, which was the subduction of the Yarlung Zangbo Ocean to the southern margin of Lassa massif during Early-Middle Jurassic period.
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表 1 日多地区叶巴组火山岩主量、微量和稀土元素分析结果
Table 1. Major, trace element and REE compositions of volcanic rocks of Yeba Formation in Riduo area
样号 D0922/1 D2840/1 D2844/2 D2854/6 D2851/2 D2856/3 D2856/4 D2856/5 D0300/30 D0308/1 D6220/2 岩石名称 蚀变玄武岩 蚀变玄武岩 玄武岩 玄武安山岩 玄武安山岩 玄武安山岩 安山岩 安山岩 英安岩 英安质晶屑凝灰岩 流纹质晶屑凝灰岩 SiO2 47.3 47.84 48.67 52.4 55.65 55.06 62.47 58.68 65.61 77.84 75.83 Al2O3 16.15 14.96 15.25 16.78 15.85 16.52 15.71 16.07 16.11 12.14 13.37 TFe2O3 9.49 9.25 9.98 9.13 7.82 8.34 5.7 8.09 7.23 1.02 2.43 MgO 10.41 10.95 8.69 5.9 3.21 3.29 1.13 2.7 1.4 0.06 0.36 CaO 9.31 8.14 9.3 8.5 4.75 4.74 2.94 4.48 0.97 0.24 0.28 Na2O 3.35 3.24 2.42 3.37 2.01 4.51 3.95 3.93 4.07 5.81 3.74 K2O 0.11 0.11 0.65 0.12 2.94 1.35 3.54 1.79 1.99 1.7 1.8 P2O5 0.14 0.16 0.12 0.11 0.21 0.24 0.2 0.2 0.03 0.03 0.08 MnO 0.16 0.16 0.19 0.17 0.12 0.15 0.12 0.14 0.1 0.04 0.07 TiO2 1.04 1.03 1.07 0.66 0.96 1.05 0.79 0.9 0.69 0.09 0.35 烧失量 3.1 4.3 4.21 3.07 6.45 4.97 3.52 3.18 1.93 1.11 1.55 总计 100.56 100.14 100.55 100.21 99.97 100.22 100.07 100.16 100.13 100.08 99.86 Mg# 71.88 73.40 66.99 60.10 48.89 47.90 31.60 43.75 31.09 12.06 25.66 tZr/℃ 628 638 627 645 774 742 778 759 802 703 830 δ 2.8 2.3 1.7 1.3 1.9 2.8 2.9 2.1 1.6 1.6 0.9 Rb 3.6 5.2 13.4 6.9 78.5 52.6 122.5 44.3 95.9 112 143 Ba 44.1 26.1 228.7 64.7 721 498.7 650.1 450.3 645.5 214.8 602 Th 1.25 2.97 1.3 1.97 9.57 8.29 17.4 7.9 9.85 6.95 10.8 U 0.29 0.61 0.68 0.44 1.97 1.59 2.96 0.92 2.03 3.43 2.32 Ta 0.62 0.48 0.38 0.54 0.9 0.55 0.87 0.85 3.03 3.8 4.38 Nb 5.11 5.14 2.4 2.93 9.54 7.25 13.2 11.2 11.1 3.05 3.26 Sr 357.7 248.9 299.1 745 251.6 545.6 379.8 312.7 251.6 148.5 91.3 P 716.9 725.5 536 554 863.9 951.3 793 805.9 171.7 226.1 403 Hf 1.78 2.43 2.02 1.92 2.9 2.77 2.98 1.76 7.27 11.1 11.8 Zr 82.7 83.8 73.3 62.8 177.9 153.7 179.6 164.3 141.1 53.7 168 V 189.4 179.6 218 210.6 211.3 213.6 78.7 135.6 135.8 9.8 26.5 Sc 24.2 28 22.8 21.1 18.1 16.5 7.4 15.2 19.9 3.8 9 Cr 347.8 314.7 324.4 89.2 23.6 18.6 6.2 7.4 19.4 5.9 3.9 Co 44.6 42 42.6 29.5 22.5 22.5 9.3 18.4 4.08 1.08 2.43 Ni 109.7 96.6 137.2 17.8 17.4 11.7 4.07 4.47 13.4 0.7 2.05 La 10.3 9.56 6.64 14.2 22.7 34.5 33.3 24.7 30.3 10.5 28.1 Ce 21.7 21 15.4 25.2 44.2 53.8 63.4 46.9 59.5 23.2 55.4 Pr 2.97 2.73 2.2 3.22 5.25 7.54 7.7 5.98 6.67 2.54 6.59 Nd 13.1 11.8 11 13.1 21.8 27.5 27.7 21.2 25.6 8.64 24.9 Sm 3.41 3.38 3.64 3.45 4.93 5.73 6.04 5.73 5.5 2.28 5.63 Eu 1.27 1.15 1.55 1.15 1.63 3.38 1.74 1.65 1.18 0.52 1.2 Gd 3.66 2.98 3.31 3.2 4.83 5.36 5.42 5.1 5.15 2.21 5.49 Tb 0.65 0.54 0.7 0.56 0.77 0.84 0.91 0.85 0.94 0.44 0.96 Dy 3.55 3.05 4.03 3.07 4.35 4.48 4.47 4.54 4.33 2.27 5.49 Ho 0.85 0.73 0.96 0.72 0.94 1 1.02 1.12 0.95 0.53 1.23 Er 2.04 1.85 2.17 1.86 2.33 2.46 2.56 2.77 2.54 1.53 3.35 Tm 0.3 0.27 0.42 0.3 0.4 0.39 0.39 0.38 0.37 0.27 0.56 Yb 1.8 1.63 2.21 1.61 2.34 2.34 2.43 2.38 2.38 1.82 3.8 Lu 0.25 0.25 0.3 0.24 0.32 0.32 0.35 0.31 0.36 0.28 0.61 Y 21.3 19.5 26.5 21.1 27.2 26.6 27 28.7 26.4 18.4 37.2 ∑REE 87.15 80.42 81.03 92.98 143.99 176.24 184.43 152.31 172.17 75.43 180.51 LREE/HREE 1.53 1.61 1.00 1.85 2.31 3.02 3.14 2.30 2.97 1.72 2.08 (La/Yb)N 4.10 4.21 2.16 6.33 6.96 10.58 9.83 7.44 9.13 4.14 5.30 δEu 1.10 1.11 1.37 1.06 1.02 0.93 0.93 0.93 0.68 0.71 0.66 注:主量元素含量单位为%, 微量和稀土元素含量为10-6 
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表 2 日多地区叶巴组火山岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 2. LA-ICP-MS U-Th-Pb isotopic data of zircons from volcanic rocks of Yeba Formation in Riduo area
测点 含量/10-6 Th/U 同位素比值 年龄/Ma Pb* Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 208Pb/232Th 1σ D0300/30英安岩 1 32 362 322 1.12 0.0508 0.0046 0.1948 0.0187 0.0276 0.0006 0.0107 0.0007 232 209 181 16 175 4 215 14 2 124 1595 1004 1.59 0.0500 0.0017 0.1918 0.0065 0.0279 0.0004 0.0099 0.0005 195 106 178 6 177 2 198 10 3 604 10985 2580 4.26 0.0503 0.0022 0.1963 0.0104 0.0285 0.0006 0.0085 0.0005 209 104 182 9 181 4 172 10 4 152 1947 1133 1.72 0.0529 0.0019 0.2024 0.0074 0.0277 0.0004 0.0097 0.0006 324 114 187 6 176 2 196 13 5 227 3401 1506 2.26 0.0525 0.0012 0.1931 0.0043 0.0268 0.0003 0.0085 0.0006 306 58 179 4 170 2 171 13 6 64 765 642 1.19 0.0541 0.0031 0.2072 0.0126 0.0277 0.0004 0.0083 0.0007 376 128 191 11 176 2 168 15 9 81 1169 650 1.80 0.0504 0.0019 0.1820 0.0063 0.0264 0.0003 0.0068 0.0009 213 87 170 5 168 2 137 18 10 85 1271 615 2.07 0.0501 0.0018 0.1817 0.0062 0.0264 0.0003 0.0068 0.0010 211 81 169 5 168 2 137 21 12 139 2017 1121 1.80 0.0494 0.0022 0.1805 0.0077 0.0265 0.0003 0.0066 0.0009 169 136 168 7 169 2 133 18 13 69 737 740 1.00 0.0499 0.0015 0.2016 0.0062 0.0293 0.0003 0.0074 0.0009 191 72 186 5 186 2 149 18 14 114 1470 1082 1.36 0.0500 0.0015 0.1952 0.0057 0.0284 0.0003 0.0071 0.0008 195 70 181 5 180 2 142 15 15 80 938 799 1.17 0.0503 0.0018 0.1924 0.0066 0.0279 0.0004 0.0075 0.0007 209 88 179 6 177 2 151 14 17 124 1675 961 1.74 0.0498 0.0015 0.1984 0.0064 0.0287 0.0003 0.0083 0.0006 187 69 184 5 182 2 167 12 18 69 857 701 1.22 0.0540 0.0023 0.2075 0.0086 0.0280 0.0004 0.0077 0.0004 369 66 191 7 178 2 155 9 19 60 738 615 1.20 0.0508 0.0018 0.1939 0.0067 0.0280 0.0004 0.0081 0.0004 232 88 180 6 178 2 164 7 20 77 1077 656 1.64 0.0518 0.0018 0.2024 0.0072 0.0283 0.0004 0.0081 0.0003 276 80 187 6 180 2 163 6 22 133 1883 1044 1.80 0.0497 0.0016 0.1922 0.0063 0.0281 0.0003 0.0087 0.0002 189 76 178 5 179 2 174 5 23 75 1003 700 1.43 0.0495 0.0018 0.1894 0.0071 0.0277 0.0003 0.0087 0.0002 172 87 176 6 176 2 176 5 24 132 1703 1267 1.34 0.0513 0.0014 0.1946 0.0054 0.0275 0.0003 0.0087 0.0002 254 63 181 5 175 2 175 5 25 559 8746 3389 2.58 0.0500 0.0010 0.1912 0.0040 0.0277 0.0003 0.0088 0.0002 198 46 178 3 176 2 176 5 27 567 9231 2997 3.08 0.0491 0.0010 0.1908 0.0038 0.0281 0.0003 0.0086 0.0002 154 44 177 3 179 2 173 5 28 124 1794 815 2.20 0.0498 0.0026 0.2051 0.0107 0.0298 0.0003 0.0089 0.0003 187 119 189 9 189 2 180 6 29 136 1871 1155 1.62 0.0519 0.0027 0.1978 0.0116 0.0273 0.0004 0.0086 0.0003 283 116 183 10 174 2 173 7 30 84 1169.77 556 2.10 0.0530 0.0024 0.2088 0.0090 0.0286 0.0004 0.0092 0.0003 332 97 193 8 182 3 185 7 D6220/2流纹质晶屑凝灰岩 3 70 1111 578 1.92 0.0498 0.0023 0.1896 0.0087 0.0276 0.0004 0.0092 0.0007 187 112 176 7 176 3 184 14 6 492 9889 3058 3.23 0.0469 0.0013 0.1609 0.0046 0.0249 0.0003 0.0078 0.0004 43 63 152 4 159 2 157 9 7 41 675 336 2.01 0.0494 0.0094 0.1635 0.0332 0.0248 0.0005 0.0084 0.0005 165 396 154 29 158 3 169 10 8 55 999 422 2.37 0.0520 0.0060 0.1874 0.0222 0.0263 0.0005 0.0073 0.0004 283 248 174 19 167 3 146 8 9 93 1571 627 2.51 0.0494 0.0020 0.1657 0.0064 0.0246 0.0003 0.0083 0.0004 169 90 156 6 157 2 167 7 10 40 574 376 1.53 0.0510 0.0038 0.1767 0.0132 0.0255 0.0004 0.0081 0.0004 239 174 165 11 162 2 162 7 11 47 723 362 2.00 0.0499 0.0029 0.1756 0.0098 0.0261 0.0005 0.0080 0.0003 187 131 164 8 166 3 162 7 13 44 698 318 2.20 0.0493 0.0031 0.1752 0.0107 0.0262 0.0004 0.0080 0.0003 165 148 164 9 167 3 161 6 14 77 1236 633 1.95 0.0498 0.0021 0.1668 0.0069 0.0245 0.0004 0.0078 0.0003 183 98 157 6 156 2 158 5 15 31 477 293 1.63 0.0504 0.0031 0.1730 0.0105 0.0254 0.0003 0.0076 0.0003 213 143 162 9 161 2 152 5 16 44 658 383 1.72 0.0498 0.0025 0.1754 0.0086 0.0259 0.0004 0.0081 0.0003 183 119 164 7 165 2 163 6 17 41 632 393 1.61 0.0532 0.0032 0.1752 0.0101 0.0241 0.0004 0.0078 0.0003 345 142 164 9 154 2 156 6 18 40 608 406 1.50 0.0509 0.0025 0.1697 0.0080 0.0245 0.0003 0.0078 0.0003 235 113 159 7 156 2 156 6 19 43 616 429 1.44 0.0499 0.0029 0.1699 0.0094 0.0250 0.0003 0.0082 0.0003 191 133 159 8 159 2 164 6 21 71 1270 525 2.42 0.0498 0.0032 0.1643 0.0094 0.0246 0.0004 0.0074 0.0003 187 150 154 8 157 3 149 5 22 36 529 391 1.35 0.0480 0.0028 0.1647 0.0102 0.0250 0.0005 0.0077 0.0003 98 133 155 9 159 3 154 6 23 44 718 373 1.92 0.0499 0.0025 0.1775 0.0086 0.0260 0.0004 0.0075 0.0003 191 120 166 7 166 2 151 5 24 35 526 374 1.41 0.0498 0.0021 0.1647 0.0068 0.0242 0.0004 0.0074 0.0003 183 96 155 6 154 2 149 5 25 39 515 378 1.36 0.0506 0.0040 0.1849 0.0133 0.0276 0.0006 0.0082 0.0004 220 181 172 11 175 4 165 7 26 34 558 251 2.22 0.0520 0.0047 0.1793 0.0159 0.0254 0.0006 0.0080 0.0003 287 209 167 14 162 4 160 6 27 59 759 670 1.13 0.0501 0.0026 0.1765 0.0093 0.0256 0.0004 0.0079 0.0003 198 119 165 8 163 3 159 6 29 66 1139 489 2.33 0.0511 0.0022 0.1703 0.0075 0.0243 0.0004 0.0076 0.0003 243 102 160 7 155 2 153 5 30 157 2438 1248 1.95 0.0498 0.0013 0.1748 0.0044 0.0256 0.0003 0.0079 0.0003 187 66 164 4 163 2 159 5 注:表中Pb*代表放射性成因铅
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表 3 日多叶巴组火山岩锆石Hf同位素分析结果
Table 3. Hf isotopic data of zircons from volcanic rocks of Yeba Formation in Riduo area
测点 年龄/Ma 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(0) εHf(t) 2σ tDM1/Ma tDMC/Ma fLu/Hf D0300/30英安岩 1 175.5 0.04641 0.00047 0.00149 0.00001 0.28274 0.00002 -1.25 2.43 0.28 739 1065 -0.96 2 177.2 0.08161 0.00176 0.00254 0.00005 0.28279 0.00002 0.79 4.38 0.28 676 942 -0.92 3 181.3 0.04734 0.00018 0.00165 0.00001 0.28283 0.00002 1.96 5.75 0.28 612 858 -0.95 4 176.3 0.06022 0.00050 0.00219 0.00002 0.28281 0.00002 1.27 4.89 0.28 650 909 -0.93 5 170.4 0.02665 0.00018 0.00081 0.00000 0.28279 0.00002 0.67 4.32 0.28 650 940 -0.98 6 175.9 0.03731 0.00019 0.00127 0.00001 0.28290 0.00002 4.54 8.26 0.28 502 692 -0.96 9 168.0 0.05263 0.00038 0.00169 0.00001 0.28282 0.00002 1.59 5.09 0.28 628 889 -0.95 10 167.9 0.05872 0.00061 0.00182 0.00002 0.28286 0.00002 3.03 6.52 0.28 571 798 -0.95 12 168.6 0.05665 0.00029 0.00209 0.00002 0.28296 0.00003 6.54 10.01 0.28 431 575 -0.94 13 186.0 0.05039 0.00060 0.00175 0.00001 0.28291 0.00002 5.04 8.91 0.28 488 659 -0.95 14 180.2 0.06196 0.00031 0.00236 0.00002 0.28294 0.00003 6.03 9.71 0.28 455 603 -0.93 15 177.5 0.06750 0.00117 0.00254 0.00005 0.28286 0.00003 3.21 6.81 0.28 575 786 -0.92 17 182.2 0.03922 0.00045 0.00150 0.00002 0.28285 0.00003 2.90 6.72 0.28 571 796 -0.95 18 178.3 0.04298 0.00039 0.00146 0.00002 0.28283 0.00002 2.12 5.87 0.28 602 848 -0.96 19 178.0 0.02938 0.00012 0.00107 0.00000 0.28279 0.00003 0.70 4.48 0.28 653 936 -0.97 20 180.1 0.01943 0.00028 0.00068 0.00001 0.28287 0.00002 3.30 7.18 0.28 543 765 -0.98 22 178.7 0.04789 0.00045 0.00169 0.00001 0.28288 0.00002 3.67 7.40 0.28 543 750 -0.95 23 176.4 0.04119 0.00050 0.00139 0.00001 0.28279 0.00002 0.54 4.25 0.28 665 949 -0.96 24 175.2 0.05037 0.00041 0.00168 0.00001 0.28286 0.00002 3.15 6.81 0.28 564 785 -0.95 25 175.9 0.05088 0.00097 0.00191 0.00003 0.28287 0.00003 3.35 6.99 0.28 559 774 -0.94 D6220/2流纹质晶屑凝灰岩 3 175.8 0.06447 0.00082 0.00214 0.00002 0.28288 0.00003 3.90 7.52 0.28 540 740 -0.94 6 158.6 0.04754 0.00038 0.00149 0.00000 0.28282 0.00002 1.81 5.14 0.28 615 879 -0.96 7 157.8 0.06811 0.00111 0.00206 0.00002 0.28287 0.00002 3.56 6.81 0.28 553 771 -0.94 8 167.4 0.10287 0.00088 0.00317 0.00001 0.28286 0.00003 3.06 6.38 0.28 592 806 -0.90 9 156.9 0.11544 0.00070 0.00338 0.00002 0.28294 0.00002 5.79 8.89 0.28 478 638 -0.90 10 162.2 0.05617 0.00053 0.00194 0.00001 0.28284 0.00004 2.56 5.92 0.28 592 832 -0.94 11 166.2 0.06290 0.00064 0.00188 0.00002 0.28290 0.00002 4.66 8.11 0.28 505 695 -0.94 13 166.7 0.07315 0.00013 0.00244 0.00001 0.28279 0.00003 0.59 3.98 0.28 682 959 -0.93 14 156.2 0.08037 0.00055 0.00262 0.00001 0.28277 0.00003 -0.01 3.15 0.28 711 1004 -0.92 15 161.4 0.06724 0.00091 0.00209 0.00003 0.28283 0.00002 2.02 5.34 0.28 617 868 -0.94 16 164.7 0.05633 0.00022 0.00178 0.00001 0.28284 0.00002 2.49 5.92 0.28 592 834 -0.95 17 153.8 0.05719 0.00092 0.00177 0.00002 0.28284 0.00002 2.37 5.57 0.28 597 848 -0.95 18 156.2 0.08726 0.00100 0.00297 0.00006 0.28289 0.00004 4.31 7.43 0.28 536 730 -0.91 19 159.3 0.07003 0.00062 0.00244 0.00002 0.28288 0.00004 3.83 7.07 0.28 548 756 -0.93 21 159.1 0.04831 0.00087 0.00147 0.00002 0.28289 0.00003 4.16 7.50 0.28 520 729 -0.96 22 165.7 0.07737 0.00041 0.00238 0.00001 0.28300 0.00002 8.04 11.42 0.28 371 482 -0.93
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表 4 日多地区中性火山岩与不同构造环境安山岩微量元素及比值对比
Table 4. Trace elements and ratios of intermediate volcanic rocks in Riduo area in comparison with features of andesite from various tectonic settings
安山岩类别 V Sc Nb Y Zr/Y Ni/Co Sc/Cr Cr/V Hf/Yb Sc/Ni Rb/Sr Ba/Rb Ba/Sr 本文平均值（n=4） 160 14 10.29 27 6.17 0.49 1.22 0.08 1.1 1.92 0.22 8.53 1.73 文献+本文平均值（n=22） 134 18 9 24 5.95 0.68 0.82 0.32 1.46 2.18 0.32 9.70 1.82 安第斯陆缘弧* 122 17 10 15 14.6 1.41 0.36 0.64 3.42 0.6 0.11 10.0 1.05 大陆岛弧* 135 20 9.4 22 5.42 0.95 0.61 0.15 1.7 1.1 0.09 8.2 1.16 大洋岛弧* 197 31 0.8 25 2.2 0.29 3.81 0.08 0.61 3.4 0.04 18.5 0.61 注:V、Sc、Nb和Y单位为10-6，表中*数据据参考文献[49]，文献数据据参考文献[4, 8-10, 12]
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