A Further Discussion on Formation Background and Tectonic Constraints of Igneous Rocks in Central Sub-Basin of the South China Sea
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摘要: 文章拟通过分析南海中央次海盆海山火山岩样品的岩石学及地球化学资料来审视研究区的岩浆过程及其构造背景.综合位于南海中央次海盆的中南、珍贝-黄岩、涨中、宪北、玳瑁、尖峰这6条海山链的火山岩资料及最新分析结果, 将来自各条海山链的洋岛型碱性玄武岩、具有过渡性质的拉斑玄武岩, 以及粗面岩、粗面安山岩、流纹英安岩等纳入统一的岩浆分异体系进行地球化学特征检验.相关参数表明, 中央次海盆海山火山岩岩浆具有连续的演化关系但源区性质并不均一, 属于EMⅠ和DMM双端员混合.根据分析样品的Mg#值、分异指数DI以及主、微量元素的分布特征, 初步判定原始岩浆在上地幔经历了橄榄石、辉石分离结晶作用后继续演化, 产生包括拉斑玄武岩、碱性玄武岩、粗面岩等在内的岩石组合.其中, 富集型OIB的多项地化参数特征表明, 岩浆在演化过程中似有陆壳成分的加入, 这可能是被动大陆边缘破裂留给南海海盆的最重要的遗产之一.Abstract: Based on analysis of petrological and geochemical information of igneous rocks sampled from central sub-basin of the South China Sea, this article attempts to address the magmatic processes and tectonic background of the research area. By renewing the available datas and combining them with latest test results of igneous rock samples collected from 6 seamount chains in the central sub-basin of South China Sea (SCS), we analyze the alkali basalt, transitional tholeiite, trachyte, trachyandesite and rhyodacite under a unified magmatic differentiation system in this paper. The geochemical indices show that the evolutionary relationship of these igneous rocks was relatively consistent and the regional mantle source was heterogeneous, consisting of two end-members: EMⅠ and DMM. According to the Mg#, differentiation index (DI), attributes of major and minor elements, we conclude that subsequent to the fractional crystallization of olivine and pyroxene in upper mantle, the primitive magma continues its evolution to bring about this rock association. Furthermore, geological datas also indicate that during the process of magma evolving, different degrees of contamination occurred in different stages of sea-floor expansion, which may be one of the most important heritage left by the rupture of passive continental margin.
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图 1 南海区域地质简图及取样海山空间分布
Fig. 1. Diagrammatic map of the South China Sea and spatial distribution of seamounts
图 2 南海中央次海盆海山火山岩TAS定名
HY.黄岩海山样品；JF.尖峰海山样品；ZZ.涨中海山样品；ZB.珍贝海山样品；DM.玳瑁海山样品；ZN.中南海山样品；XB.宪北海山样品，下同；底图引自Irvine et al., 1971；划分岩性系列曲线Ir据Maitre et al., 1989
Fig. 2. TAS diagram of igneous rocks sampled from seamounts in central sub-basin of the SCS
图 3 南海中央次海盆海山亚碱性火山岩AFM判别(底图引自Irvine et al., 1971)
Fig. 3. AFM diagram of sub-alkali basalts sampled from seamounts in central sub-basin of the SCS
图 4 南海中央次海盆海山火山岩稀土元素配分曲线
a.海山拉斑玄武岩稀土元素球粒陨石标准化模式；b.海山碱性玄武岩稀土元素球粒陨石标准化模式；c.尖峰海山安山岩、英安岩稀土元素球粒陨石标准化模式；球粒陨石数据采用Sun and McDonough, 1989；OIB、N-MORB、E-MORB数据来自Sun and Nesbitt, 1977；大陆边缘及岛弧安山岩数据来自Culler and Medaris, 1977
Fig. 4. Chondrite-normalized REE patterns of igneous rocks sampled from seamounts in central sub-basin of the SCS
图 5 南海中央次海盆海山火山岩微量元素原始地幔标准化蛛网图
a.海山拉斑玄武岩微量元素原始地幔标准化模式；b.海山碱性玄武岩微量元素原始地幔标准化蛛网；PM数据引自Sun and McDonough, 1989；OIB、N-MORB数据引自Sun and Nesbitt, 1977
Fig. 5. PM-Normalized trace elements pattern of igneous rocks sampled from seamounts in central sub-basin of the SCS
图 6 南海中央次海盆海山火山岩Sr-Nd同位素关系(底图据Zindler and Hart, 1986)
Fig. 6. Sr-Nd diagram of igneous rocks sampled from seamounts in central sub-basin of the SCS
图 7 南海中央次海盆海山火山岩铅同位素演化图解(地幔端员数据据Zindler and Hart, 1986；半球参考线NHRL据Hart, 1984)
Fig. 7. Pb isotopes diagram of igneous rocks sampled from seamounts in central sub-basin of the SCS
图 8 南海中央次海盆海山火山岩La/Sm-La图解
Fig. 8. La/Sm-La diagram of igneous rocks sampled from seamounts in central sub- basin of the SCS
图 9 南海中央次海盆海山火山岩浆分异结晶过程PELE软件模拟
Fig. 9. The PELE simulation of magma fractional crystallization of igneous rocks sampled from seamounts in central sub-basin of the SCS
表 1 南海中央次海盆海山火山岩样品基本信息统计
Table 1. The statistics of basic features of igneous rocks sampled from seamounts in central sub-basin of the SCS
海山名称 采样位置 水深(m) 样品编号 岩性 全岩年龄(Ma) 附近磁条带 N E 编号年龄(Ma) 中南 14°00′ 115°35′ 2 881~3 213 10-1，2；D10 碱性玄武岩 3.49±0.9 6A 21 珍贝 14°48′ 116°30′ 2 735~3 488 9-1，2，3；D9；D9-1, 2, 3 碱性/拉斑玄武岩 9.1±0.2~10.0±2 5d 17 黄岩 15°14′ 117°5′ 3 348 9DG，9DG2 粗面岩 7.77±0.49 5d 17 涨中 15°35′ 116°09′ 1 290 SO4-12-8, 10, 11, 12, 18, 20, 21, 22；SO4-12DG 碱性玄武岩 4.76~5.78 6A 21 宪北 16°37′ 116°41′ —— CB-2, 5；CB-7-1, 2, 3 碱性/拉斑玄武岩 碱性15-23；拉斑38 6B 23 玳瑁 17°37′ 116°59′ 2 981~3 877.5 8-1, 2, 3, 4, 5G, 6, 7, 7G；D8-1, 2, 3, 4；V36-D8-1，3 拉斑玄武岩 14.1±1.14 8 26 尖峰 19°20′ 116°10′ 1 500~2 000 ZF-1，ZFF-2 英安岩、安山岩 18.61±4.88 10 30 注: 各海山样品数据来源：中南、珍贝、玳瑁海山数据引自 Tu et al., 1992 ；黄岩海山王叶剑等(2009)；涨中海山鄢全树等(2008)；宪北、尖峰海山李兆麟等(1991)；本文测试样品编号为SO4-12DG和V36-D8-1，3，下同.
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表 2 南海中央次海盆海山火山岩地球化学数据
Table 2. Geological data of igneous rocks sampled from seamounts in central sub-basin of the SCS
原编号 10-2 D10 9-3 D9-1 D9-2 9DG-2 9DG SO4-12-8 SO4-12-10 SO4-12-11 SO4-12-12 SO4-12-18 SO4-12-20 SO4-12-21 SO4-12-22 主量元素 SiO2 41.45 46.31 47.39 49.13 48.91 63.59 60.33 48.75 48.28 47.57 45.43 50.03 46.97 48.48 42.35 TiO2 3.22 3.36 3.46 2.19 3.67 0.31 0.48 2.33 2.36 2.07 2.59 2.04 2.20 2.18 2.54 Al2O3 14.65 16.53 15.58 16.08 15.77 17.55 17.56 19.14 19.04 17.12 18.12 19.15 16.95 17.5 17.41 Fe2O3 9.59 2.38 7.51 2.51 2.58 —— —— 3.21 3.34 4.42 8.72 4.33 5.33 2.61 13.00 FeO 3.33 8.57 4.27 9.05 9.3 3.97 4.84 4.28 4.48 5.2 2.73 2.7 4.85 6.84 1.47 MnO 0.88 0.20 0.11 0.14 0.14 0.22 0.55 0.14 0.15 0.23 0.23 0.11 0.33 0.2 0.44 MgO 5.40 6.32 2.69 5.50 3.38 0.38 0.51 2.42 2.60 5.74 3.81 2.13 5.91 5.61 3.80 CaO 6.58 9.37 7.91 11.00 8.99 1.16 1.73 8.52 8.83 8.1 9.87 8.45 7.96 8.11 8.19 Na2O 3.02 3.42 3.46 3.02 3.51 5.52 5.8 5.13 5.13 4.58 3.21 5.10 4.05 4.89 2.87 K2O 2.62 2.67 2.41 0.77 2.42 6.01 5.13 2.78 2.74 2.32 1.28 2.83 2.04 2.61 1.01 P2O5 0.65 0.89 1.30 0.61 1.33 0.07 0.15 0.77 0.83 0.85 0.95 0.94 0.70 0.68 1.17 LOI 8.44 —— 2.79 —— —— 0.66 1.70 2.33 1.96 1.98 3.02 2.15 2.83 0.67 4.26 总量 99.30 100.02 98.61 100.00 100.00 99.44 98.78 99.80 99.70 100.2 100.00 100.00 100.10 100.40 98.50 σ —— 11.20 7.85 5.95 6.46 6.89 10.88 11.73 10.42 8.30 8.95 9.34 10.26 —— Mg# 44.83 51.50 30.51 46.68 34.36 14.70 15.94 37.80 38.47 52.96 39.33 36.76 52.44 52.36 34.18 稀土元素 La 42.8 51.29 33.10 16.20 51.21 83.47 82.25 66.90 64.60 49.10 48.80 70.20 60.20 57.00 65.80 Ce 187.20 109.01 87.18 33.23 106.44 162.30 154.84 108.00 158.00 86.90 87.40 111.00 96.60 97.10 111.00 Pr 11.16 —— 10.32 —— —— 16.19 18.11 12.40 12.00 9.26 9.64 12.30 10.50 10.60 13.00 Nd 34.04 57.74 36.43 23.42 54.89 54.82 61.19 46.60 45.80 34.50 39.40 46.00 40.10 40.30 52.10 Sm 7.75 11.56 9.56 4.80 11.24 8.76 11.39 8.78 8.58 6.61 7.66 8.49 7.74 7.64 10.29 Eu 2.82 3.81 3.31 1.74 3.76 1.14 3.02 2.82 2.81 2.19 2.52 2.70 2.52 2.45 3.18 Gd 5.33 —— 8.64 —— —— 6.34 9.06 7.48 7.58 5.68 6.69 7.49 6.71 6.67 9.49 Tb 1.19 1.86 1.36 0.88 1.74 1.01 1.32 1.16 1.16 0.86 0.99 1.12 1.03 0.95 1.37 Dy 6.38 —— 7.48 —— —— 5.21 7.25 6.32 6.37 4.85 5.59 6.54 5.9 5.32 7.79 Ho 1.86 1.7 2.66 —— —— 0.96 1.43 1.18 1.24 0.92 1.05 1.21 1.11 1.02 1.46 Er 2.67 —— 3.27 —— —— 2.51 3.76 3.37 3.48 2.85 3.01 3.54 3.15 2.85 4.16 Tm 0.31 —— 0.36 —— —— 0.39 0.54 0.45 0.48 0.36 0.39 0.47 0.45 0.38 0.53 Yb 3.02 2.46 3.51 1.96 2.64 2.20 3.41 2.88 2.95 2.24 2.43 3.05 2.65 2.39 3.20 Lu 0.31 0.43 0.44 0.36 0.43 0.35 0.53 0.44 0.46 0.35 0.37 0.48 0.41 0.36 0.48 Y 29.56 43.10 41.24 39.00 45.00 23.11 31.78 34.00 35.10 24.20 30.20 37.10 31.00 26.50 45.60 ∑REE 336.40 282.96 248.86 121.59 277.35 368.75 389.87 302.78 350.61 230.87 246.14 311.60 270.07 261.53 329.36 LREE 285.77 233.41 179.9 79.39 227.54 326.68 330.80 245.50 291.79 188.56 195.42 250.60 217.66 215.09 255.28 HREE 50.63 49.55 68.96 42.20 49.81 42.07 59.07 57.28 58.82 42.31.0 50.72 61.00 52.41 46.44 74.08 LREE/HREE 5.64 4.71 2.60 1.88 4.56 7.76 5.60 4.28 4.96 4.45 3.85 4.10 4.15 4.63 3.44 (La/Yb)N 10.17 14.96 6.76 5.93 13.91 27.26 17.32 16.66 15.71 15.72 14.41 16.51 16.29 17.11 14.75 微量元素 Li 17.00 —— —— —— —— 12.64 15.40 8.34 8.69 11.60 16.90 9.88 14.40 8.36 19.40 Sc 23.00 23.20 —— 42.00 24.00 4.28 4.63 18.70 20.30 18.00 23.70 18.50 18.70 18.80 23.70 V —— 249.20 —— 298.00 308.00 29.15 17.34 150.00 163.00 148.00 219.00 141.00 146.00 152.00 201.00 Cr —— 146.40 —— 200.00 15.00 3.45 2.01 111.00 124.00 149.00 195.00 155.00 140.00 121.00 161.00 Co 79.00 58.30 79.00 50.00 54.00 5.67 24.80 30.10 32.40 46.40 44.10 28.30 57.20 44.10 76.60 Ni 237.00 76.50 60.00 43.00 15.00 26.70 84.25 13.60 16.60 100.00 67.60 22.40 112.00 77.20 171.00 Cu 160.00 47.90 24.00 87.00 27.00 25.30 59.13 42.40 41.80 39.80 42.70 43.40 43.30 42.00 38.50 Zn —— 118.30 —— 152.00 161.00 94.88 62.35 96.00 101.00 102.00 129.00 84.20 107.00 91.30 141.00 Rb 54.00 60.70 68.00 34.00 54.00 36.38 87.09 83.20 82.90 66.80 16.90 85.50 54.40 78.80 16.40 Sr 349.00 819.20 400.00 301.00 749.00 31.62 235.48 721.00 737.00 652.00 597.00 685.00 631.00 661.00 1 929.00 Zr 330.00 348.50 274.00 156.00 344.00 419.00 646.50 316.00 203.00 250.00 232.00 336.00 275.00 279.00 211.00 Nb 84.00 83.50 60.00 22.00 53.00 —— 99.74 82.80 81.50 69.30 58.80 87.70 71.60 74.50 56.10 Cs 28.00 —— 31.00 —— —— —— 0.58 1.25 1.14 0.92 0.34 1.26 0.77 1.07 0.53 Ba 810.00 853.60 423.00 —— 411.00 108.30 1633.01 625.00 650.00 538.00 485.00 603.00 492.00 592.00 348.00 Hf —— 8.10 —— —— —— —— 16.72 6.14 6.17 5.28 5.17 6.42 5.92 5.61 5.16 Ta 2.50 4.00 1.60 —— —— —— 7.00 5.03 4.89 4.49 3.57 5.15 4.63 4.33 3.66 Pb —— —— —— —— —— 19.26 37.66 7.44 7.42 6.82 7.90 7.16 9.75 7.26 36.50 Bi —— —— —— —— —— —— 0.50 0.10 0.12 0.13 0.14 0.13 0.15 0.14 0.49 Th 13.60 5.40 9.50 —— —— —— 14.85 9.85 9.78 8.92 6.66 10.8 8.59 9.07 8.19 U 24.80 —— 5.30 —— —— —— 1.37 2.24 2.27 1.98 1.27 2.65 1.69 2.02 1.68 Mo 9.40 —— —— —— —— —— —— 5.12 5.38 4.51 2.84 5.46 4.21 5.28 5.60 同位素 87Sr/86Sr —— 0.704 007 —— —— 0.703 976 0.704 433 0.704 183 0.703 963 —— —— 0.704 038 0.703 961 0.704 137 —— —— 143Nd/144Nd —— 0.512 805 —— —— 0.512 813 0.512 922 0.512 827 0.512 901 —— —— 0.512 863 0.512 894 0.512 855 —— —— 206Pb/204Pb —— 18.875 —— —— 18.954 18.667 18.687 18.409 —— —— 18.622 18.372 18.501 —— —— 207Pb/204Pb —— 15.593 —— —— 15.588 15.535 15.680 15.558 —— —— 15.596 15.534 15.596 —— —— 203Pb/204Pb —— 38.931 —— —— 38.991 38.677 39.002 38.523 —— —— 38.767 38.443 38.665 —— —— 资料来源 ① ② ① ② ② ③ ③ ④ ④ ④ ④ ④ ④ ④ ④ 原编号 SO4-12-DG CB-2 CB-5 CB-7-1 CB-7-2 CB-7-3 8-5 8-6 8-7 D8-2 D8-4 V36-D8-1 V36-D8-3 ZF-1 ZFF-2 主量元素 SiO2 —— 48.80 42.39 42.34 44.09 43.70 46.38 47.39 48.54 49.20 49.73 —— —— 67.21 58.06 TiO2 —— 1.76 2.55 2.77 2.74 2.38 1.93 2.09 2.04 2.14 2.09 —— —— 0.23 0.82 Al2O3 —— 13.66 12.46 13.13 12.40 13.18 14.13 14.96 13.67 15.82 15.97 —— —— 13.22 15.67 Fe2O3 —— 6.75 5.81 5.83 4.82 4.73 4.86 8.54 6.59 2.52 2.42 —— —— 2.55 4.23 FeO —— 6.02 5.55 5.88 6.23 5.97 7.87 3.52 5.71 9.07 8.71 —— —— 2.43 3.33 MnO —— 0.68 0.56 0.89 0.25 0.18 0.21 0.28 0.50 0.19 0.13 —— —— 0.22 0.65 MgO —— 6.67 12.29 10.54 12.79 11.96 7.85 6.53 5.00 5.65 6.10 —— —— 0.59 1.70 CaO —— 10.02 10.00 10.33 9.53 9.66 9.96 10.11 6.85 11.03 10.77 —— —— 2.07 2.85 Na2O —— 2.40 2.70 3.03 3.02 3.03 2.56 3.00 3.00 3.09 3.15 —— —— 4.41 5.46 K2O —— 1.19 1.73 2.03 1.85 1.96 0.6 0.64 1.28 0.74 0.59 —— —— 1.92 3.70 P2O5 —— 0.10 0.65 0.76 0.60 0.96 0.25 0.48 0.34 0.54 0.34 —— —— 0.00 0.40 LOI —— 1.28 2.61 1.79 1.28 2.01 —— —— 7.40 —— —— —— —— —— —— 总量 —— 99.33 99.30 99.32 99.33 99.45 99.77 100.65 98.92 99.99 100.00 —— —— 99.64 99.31 σ —— 2.22 —— —— 21.76 35.57 2.95 3.02 3.30 2.37 2.08 —— —— 1.66 5.57 Mg# —— 50.00 57.77 63.03 68.54 58.39 53.58 51.19 48.36 47.28 50.21 —— —— 18.35 30.01 稀土元素 La 66.86 9.00 60.42 70.08 49.36 58.26 9.30 13.92 11.83 17.47 17.53 19.32 20.90 20.99 122.86 Ce 106.70 24.37 121.20 137.40 90.07 101.60 46.25 52.70 51.89 34.10 40.54 34.17 38.24 47.10 116.86 Pr 14.12 4.12 13.66 15.60 11.64 12.79 3.20 4.05 3.79 —— —— 5.11 5.31 6.36 24.88 Nd 56.36 18.00 50.50 56.44 39.00 47.02 11.22 14.21 13.87 15.56 20.06 22.46 23.13 25.19 84.82 Sm 11.47 5.25 10.03 11.02 8.37 9.06 3.32 3.82 4.33 5.12 5.12 5.50 5.59 6.51 15.98 Eu 3.77 1.54 2.93 3.12 2.37 2.79 1.27 1.29 1.44 1.61 1.78 1.83 1.89 1.99 3.23 Gd 12.60 7.68 9.26 10.08 7.59 8.36 3.17 3.42 5.39 —— —— 6.06 6.28 7.50 13.49 Tb 1.80 1.41 1.37 1.53 1.18 1.23 0.64 0.67 1.04 0.81 0.75 0.94 0.97 1.40 1.80 Dy 10.68 8.69 6.57 8.05 6.44 5.83 3.53 3.35 5.48 —— —— 5.58 5.79 6.12 9.95 Ho 2.19 1.80 1.22 1.44 1.29 1.08 1.01 0.99 1.68 0.80 0.60 1.13 1.18 1.77 2.08 Er 6.00 4.85 3.01 3.49 2.94 2.85 1.65 1.41 2.71 —— —— 3.10 3.22 5.96 5.74 Tm 0.80 0.71 0.47 0.49 0.39 0.39 0.27 0.19 0.28 —— —— 0.43 0.45 0.81 0.84 Yb 4.70 4.60 2.61 1.89 2.30 2.36 1.82 1.49 3.25 2.33 1.91 2.64 2.70 5.51 5.13 Lu 0.72 0.66 0.36 0.4 0.31 0.33 0.22 0.16 0.31 0.38 0.37 0.38 0.41 0.81 0.73 Y 54.32 39.49 31.31 31.92 23.21 27.31 18.82 20.59 28.99 33.60 29.50 19.27 21.18 45.55 57.90 ∑REE 298.77 132.17 352.95 246.46 281.26 314.92 105.69 122.26 111.78 118.16 136.28 108.64 116.05 183.57 466.29 LREE 259.28 62.28 293.66 200.81 231.52 258.74 74.56 89.99 73.86 85.03 87.15 88.39 95.06 108.14 368.63 HREE 39.50 69.89 59.29 45.65 49.74 56.18 31.13 32.27 37.92 33.13 49.13 20.26 20.99 75.43 97.66 LREE/HREE 6.56 0.89 4.95 4.39 4.65 4.6 2.39 2.78 1.94 2.56 1.77 4.36 4.53 1.43 3.77 (La/Yb)N 14.21 1.40 26.60 15.39 17.71 16.61 3.67 6.70 5.38 6.58 2.61 7.33 7.73 2.73 17.18 微量元素 Li —— 17.10 —— 10.70 9.60 —— 14.00 56.00 13.00 —— —— —— —— 22.90 32.00 Sc —— 44.60 —— 27.40 25.40 —— 31.00 27.00 25.00 38.40 34.50 —— —— 17.20 11.90 V —— —— —— —— —— —— —— —— —— 288.10 288.50 —— —— —— —— Cr —— 204.00 —— 298.00 545.00 —— —— —— —— 32.30 174.90 —— —— 18.30 14.10 Co —— 72.90 —— 73.90 52.50 —— 79.00 39.60 55.00 54.00 59.60 —— —— 10.00 22.60 Ni —— 166.00 —— 242.00 315.00 —— 158.00 95.00 158.00 37.90 47.70 —— —— 33.90 82.90 Cu —— 178.00 —— 72.10 66.20 —— 64.00 80.00 80.00 93.80 84.80 —— —— 78.70 82.60 Zn —— —— —— —— —— —— —— —— —— 166.60 128.90 —— —— —— —— Rb 13.17 —— —— —— —— —— 34.00 38.00 30.00 19.30 12.50 7.28 22.44 —— —— Sr 941.20 94.50 —— 653.00 569.00 —— 162.00 170.00 145.00 320.60 313.90 360.80 353.60 107.00 386.00 Zr 283.40 138.00 —— 270.00 244.00 —— 120.00 135.00 153.00 157.30 149.80 132.80 146.50 336.00 260.00 Nb 54.32 6.90 —— 63.80 52.40 —— 21.00 24.50 25.00 23.40 20.60 19.27 21.18 10.30 8.70 Cs —— —— —— —— —— —— 25.00 26.00 21.00 —— —— —— —— —— —— Ba 603.20 39.90 —— 632.00 544.00 —— 99.00 —— —— 32.00 15.10 120.50 113.40 407.00 1 200.00 Hf 6.03 4.40 —— 6.20 5.40 —— 3.20 3.70 3.10 3.39 8.00 5.50 Ta 3.88 1.40 —— 4.00 4.00 —— —— 0.80 —— 1.40 1.20 1.24 1.36 2.40 2.60 Pb —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— Bi —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— Th 7.31 8.50 —— 16.60 15.00 —— 4.00 6.00 5.00 1.60 2.20 2.51 2.51 5.50 12.40 U —— 349.00 —— 228.00 220.00 —— 5.30 5.30 5.30 —— —— —— —— 24.10 149.00 Mo —— —— —— —— —— —— 1.30 0.30 5.60 —— —— —— —— —— —— 同位素 87Sr/86Sr —— —— —— —— —— —— —— —— —— 0.703 594 0.703 561 —— —— —— —— 143Nd/144Nd —— —— —— —— —— —— —— —— —— 0.512 929 0.512 916 —— —— —— —— 206Pb/204Pb —— —— —— —— —— —— —— —— —— 18.704 18.600 —— —— —— —— 207Pb/204Pb —— —— —— —— —— —— —— —— —— 15.609 15.632 —— —— —— —— 203Pb/204Pb —— —— —— —— —— —— —— —— —— 38.325 38.848 —— —— —— —— 资源来源 本次测 ⑤ ⑤ ⑤ ⑤ ⑤ ① ① ① ② ② 本次测 本次测 ⑤ ⑤ 注：表中主量元素单位为%，微量元素及稀土元素单位为μg/g；①梁德华和李扬，1991；② Tu et al., 1992 ；③王叶剑等，2009；④鄢全树等，2008；⑤李兆麟等，1991.
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表 3 由宪北海山地幔岩包体估算的研究区原始地幔主量元素比值及两类富集地幔端员同类比值
Table 3. Average magma compositions of study area estimated by mantle xenoliths from Xianbei seamount and those of enriched mantle end members
CBB1 CBB2 CBB3 EMⅠ EMⅡ DMM K2O/TiO2 0.97 0.93 0.83 0.32~0.44 0.42~0.68 0.078 CaO/Al2O3 0.64 0.78 0.46 0.53~0.61 0.79~0.94 0.750 注: CBB-1，2，3数据梁德华和李扬，1991；EMⅠ、EMⅡ和DMM数据引自Jackson and Dasgupta, 2008.
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