Source characteristics of basalts in Sanshui Basin and the early tectonic evolution stage of the South China Sea
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摘要:
南海在扩张前是否经历了陆内裂谷阶段是南海成因研究中一个重要的问题。三水盆地位于南海北部陆缘，其新生代以来喷发的双峰式火山岩具备大陆裂谷的岩石组合特征。通过对其中玄武岩主微量元素分析认为三水盆地玄武岩可以分为亚碱性和碱性玄武岩系列，两者均显示出明显的Nb、Ta正异常，相对于大陆地壳具有较低的Th/Sc、La/Nb和U/Al×1000，陆壳混染程度低；首次对盆地内玄武岩进行40Ar-39Ar测年，结合前人年代学结果表明玄武质岩浆强烈喷发的时段为61～54 Ma，其中亚碱性玄武岩喷发时间（60 Ma）早于碱性玄武岩（56 Ma）；通过熔融柱模型反演得到亚碱性岩浆源区起止熔融温压分别为1 517 ℃（3.03 GPa）和1 471 ℃（2.25 GPa），深度为101～76 km，碱性岩浆源区起止熔融温压分别为1 555 ℃（3.33 GPa）和1 506 ℃（2.48 GPa），深度为110～84 km，整体为石榴石-尖晶石橄榄岩过渡区且呈逐渐变深的趋势。综合岩浆源区特征以及岩石组合特征认为三水盆地在古新世具备大陆裂谷特征。通过对比三水盆地与南海扩张期岩浆活动的分布时段及源区特征，发现三水盆地与南海扩张期岩浆活动时间分布存在较长间隔，深部过程差异较大，三水盆地岩浆活动与南海扩张并无直接因果联系。
Abstract:It is an important issue in the study of the origin of the South China Sea (SCS) whether the SCS evolved in an intracontinental rift stage before its opening up. The Sanshui Basin is located on the northern margin of the SCS. The Cenozoic eruption of the bimodal volcanic suggest that the basin was a continental rift. The major and trace elements of the basalts indicate that the basalts in Sanshui Basin can be divided into sub-alkaline and alkaline basalts series. Both of them show obvious Nb and Ta positive anomalies. Compared with the continental crust, they have lower Th/Sc, La/Nb and U/Al×1000. 40Ar-39Ar age and previous chronology results suggests that the eruption of basaltic magma was intense in 61～54 Ma, while the eruption of sub-alkaline basalt (60 Ma) is earlier than alkaline basalt (56 Ma). Based on the mantle melting column model, the temperature and pressure of the subalkaline magma source range from 1 517℃ (3.03 GPa) to 1 471℃ (2.25 GPa), in a depth of 101～76 km, while the alkaline magma source range from 1 555℃ (3.33 GPa) to 1 506℃ (2.48 GPa) in a depth of 110～84 km. According to the source of magmatism and rock assemblage, it is concluded that the Sanshui Basin was a Paleocene continental rift. Comparing the temporal distribution and source magmatic activity in the spreading period between the Sanshui Basin and the South China Sea, it is inferred that there is a long time interval between the magmatic activity of the Sanshui Basin and the spreading of SCS, and the deep process is quite different. There is no direct relationship between magmatism in the Sanshui Basin and the spreading of SCS.
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Key words:
- basalt /
- Sanshui Basin /
- evolution of the SCS /
- magmatic source /
- mantle melting column model
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表 1 三水盆地玄武岩野外及镜下特征
Table 1. Field and microscopic characteristics of basalts in Sanshui Basin
采样地区 野外特征 镜下结构 主要矿物及含量 矿物特征 紫洞（ZD） 灰黑色、块状构造，露头呈现明显的柱状节理 间粒-间隐结构 橄榄石（1%～3%）、单斜辉石（10%～12%）、斜长石（15%～19%） 橄榄石无色（0.2～0.3 mm），他形粒状包裹于辉石颗粒中；辉石（2 mm）具筛状熔蚀特征，自形短柱状；斜长石（2～6 mm），发育聚片双晶，可见环带结构。 王借岗（WJG） 黑色、块状构造 间隐结构 橄榄石（3%～5%）、辉石（10%～15%）、斜长石（20%～36%） 橄榄石呈椭圆形粒状（1.5～3 mm）。部分细粒橄榄石被具有环带的辉石包裹在核部。单斜辉石裂隙发育，多见呈八边形的横切面。 邓群村（DQC） 黑色、块状构造 间隐结构 辉石（5%～10%）、斜长石（约20%） 辉石（1 mm）分为两类，一类为未发生变质的新鲜辉石，呈他形，另一类为表面发生滑石化的辉石。 石头村（STC） 黑色、块状构造 间粒-间隐结构 辉石（约15%）、斜长石（约15%） 单斜辉石多见呈八边形的横切面，亦可见发育裂纹，发育较弱的环带。斜长石自形板状，发育清晰、完整的环带结构。部分长石具有熔蚀结构。基质具间隐结构，主要为斜长石微晶。 
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表 2 三水盆地玄武岩主量元素测试及标准矿物计算结果
Table 2. Major element and CIPW results of basalts in Sanshui Basin
主量元素含量/（wt%） 标准矿物计算/% 样品编号 SiO2 Al2O3 TiO2 Fe2O3 Fe2O3T FeO CaO MgO K2O Na2O MnO P2O5 FeOT Q Or Ab An Ne Di Hy Ol Mt Il Hm Ap 紫洞 ZD-201-A 51.66 15.88 1.96 3.43 − 7.01 7.86 6.63 1.61 3.31 0.16 0.50 10.10 0.30 9.49 28.00 23.74 0.00 9.67 18.95 0.00 4.97 3.72 0.00 1.16 ZD-201 51.77 16.20 1.95 3.39 − 6.76 7.96 6.33 1.64 3.35 0.16 0.50 9.82 0.49 9.67 28.31 24.35 0.00 9.57 17.83 0.00 4.92 3.70 0.00 1.16 14SSZD-N 50.98 15.84 2.03 − 11.43 − 7.96 5.85 1.71 3.57 0.15 0.49 10.28 0.00 10.17 30.40 22.31 0.00 11.41 14.41 0.00 6.27 3.89 0.00 1.15 14SSZD-S2 51.35 15.63 1.91 − 10.97 − 7.57 6.28 2.04 3.65 0.15 0.45 9.86 0.00 12.12 31.11 20.38 0.00 11.58 11.19 2.74 6.18 3.65 0.00 1.05 ZD-101 52.46 15.98 1.89 2.97 − 6.85 7.51 6.17 2.07 3.50 0.14 0.47 9.52 0.00 12.24 29.62 21.78 0.00 10.06 16.23 1.11 4.31 3.58 0.00 1.08 14SSZD-S1 52.44 16.00 1.91 − 10.79 − 7.46 5.22 2.00 3.56 0.15 0.45 9.71 2.15 11.87 30.35 21.93 0.00 9.95 12.94 0.00 6.11 3.66 0.00 1.05 ZD-202 51.44 16.16 2.01 6.31 − 4.34 8.01 6.04 1.65 3.35 0.16 0.51 10.03 2.66 10.03 29.20 24.87 0.00 9.93 12.94 0.00 5.24 3.92 0.00 1.22 ZD-203 51.70 16.05 2.00 5.53 − 4.96 7.68 5.81 1.98 3.63 0.15 0.52 9.94 0.73 11.92 31.37 22.09 0.00 10.62 13.00 0.00 5.18 3.88 0.00 1.22 18SS082-1 51.31 16.25 2.02 0.00 11.20 6.87 8.24 5.31 1.66 3.33 0.14 0.53 10.08 1.30 9.86 28.42 24.67 0.00 10.54 14.88 0.00 5.21 3.87 0.00 1.25 18SS082-2 51.84 16.12 2.03 0.00 10.82 7.94 8.17 5.15 1.80 3.38 0.15 0.53 9.74 0.03 10.74 28.87 23.69 0.00 11.25 17.37 0.00 2.93 3.88 0.00 1.24 王借岗 WJG-201 47.26 16.78 2.85 5.35 − 4.83 8.54 7.17 1.76 4.51 0.15 0.81 9.64 0.00 10.39 26.66 20.33 6.25 13.05 0.00 8.27 7.76 5.42 0.00 1.87 WJG-203 47.80 17.36 2.79 4.70 − 5.20 8.47 6.58 1.68 4.45 0.14 0.82 9.06 0.00 9.92 28.92 22.46 4.72 11.13 0.00 8.83 6.82 5.30 0.00 1.91 WJG-204 47.05 17.27 2.76 4.81 − 5.53 8.78 6.78 1.69 4.37 0.15 0.81 9.36 0.00 9.98 25.74 22.55 6.07 12.41 0.00 9.17 6.97 5.25 0.00 1.87 14SS012c 46.52 16.92 2.88 − 11.43 − 8.60 7.00 2.20 3.58 0.15 0.72 10.28 0.00 13.13 22.38 23.74 4.43 11.49 0.00 11.50 6.15 5.51 0.00 1.69 14SS012b 46.86 16.65 2.82 − 11.04 − 8.97 7.09 2.20 3.51 0.15 0.72 9.93 0.00 13.08 22.16 23.32 4.22 13.32 0.00 10.91 5.93 5.39 0.00 1.68 14SS012 46.89 16.88 2.76 − 10.99 − 8.67 7.23 2.24 3.46 0.15 0.73 9.89 0.00 13.31 22.80 24.09 3.62 11.44 0.00 11.85 5.91 5.28 0.00 1.71 18SS083-3 47.73 17.02 2.79 − 10.57 8.43 8.53 6.53 1.90 3.88 0.15 0.88 9.51 0.00 11.34 25.09 23.62 4.38 10.79 0.00 15.60 1.76 5.36 0.00 2.07 石头村 14SS004-2 47.74 17.40 2.79 − 12.11 − 9.70 5.08 1.71 2.83 0.15 0.49 10.89 0.00 10.17 24.13 29.98 0.00 12.33 7.23 3.54 6.14 5.34 0.00 1.15 18SS079-2 47.74 17.48 2.81 − 11.79 8.04 9.82 5.41 1.37 2.91 0.15 0.53 10.61 0.00 8.14 24.80 30.91 0.00 12.04 6.55 6.76 4.18 5.39 0.00 1.23 17SS060-1 47.72 17.34 2.85 − 11.95 6.83 10.00 5.29 1.34 2.85 0.17 0.50 10.75 0.00 8.00 24.30 30.78 0.00 12.75 9.75 1.44 6.37 5.46 0.00 1.17 17SS060-2 47.98 17.71 2.81 − 11.69 8.07 9.95 5.13 1.30 2.72 0.17 0.53 10.52 0.00 7.75 23.23 32.57 0.00 11.23 11.62 3.00 3.98 5.39 0.00 1.23 18SS079-1 47.90 17.28 2.82 − 11.75 8.41 10.01 5.23 1.36 2.96 0.15 0.54 10.57 0.00 8.09 25.26 30.16 0.00 13.44 5.10 7.77 3.51 5.42 0.00 1.26 18SS081-8 47.90 17.49 2.84 − 11.86 7.60 9.90 5.13 1.47 2.71 0.16 0.54 10.67 0.00 8.75 23.14 31.49 0.00 11.74 11.08 2.12 4.98 5.45 0.00 1.26 18SS081-7 48.13 17.36 2.81 − 11.83 8.10 9.94 5.28 1.38 2.56 0.16 0.55 10.64 0.00 8.24 21.84 32.10 0.00 11.48 14.48 1.07 4.13 5.39 0.00 1.28 邓群村 17SS063-2 48.94 16.26 2.73 − 13.06 6.04 8.33 4.02 1.80 3.46 0.23 1.16 11.75 2.78 10.73 29.48 23.67 0.00 8.14 7.99 0.00 9.27 5.22 0.00 2.72 19SS023-1 49.25 15.83 2.83 − 13.67 6.52 7.73 4.12 1.61 3.51 0.26 1.19 12.31 3.95 9.56 29.93 22.85 0.00 6.31 9.83 0.00 9.40 5.41 0.00 2.78 17SS063-1 49.11 16.33 2.70 − 12.90 7.35 8.55 3.95 1.64 3.37 0.20 1.25 11.61 2.14 9.79 28.74 24.79 0.00 7.96 11.58 0.00 6.92 5.18 0.00 2.91
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表 3 三水盆地玄武岩微量元素测试结果
Table 3. Trace elements of basalts in Sanshui Basin
μg/g 样品编号 Y La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Li Be Sc V Cr Co 紫洞 ZD-201-A 28.73 30.17 53.38 6.88 28.27 6.66 2.17 6.24 1.11 6.05 1.10 2.67 0.46 2.88 0.62 22.48 1.88 23.08 165.40 217.60 41.94 ZD-201 27.26 29.07 51.27 6.55 27.06 6.50 2.12 5.95 1.06 5.65 1.06 2.54 0.44 2.77 0.60 21.49 1.65 21.50 155.00 192.00 37.32 14SSZD-N 29.40 28.10 53.40 6.61 27.40 6.23 2.09 6.23 1.00 5.59 1.06 2.81 0.41 2.42 0.36 − 1.61 21.20 159.00 139.00 42.80 14SSZD-S2 28.20 28.70 54.00 6.57 26.70 6.01 1.98 5.91 0.95 5.41 1.02 2.73 0.40 2.45 0.37 − 1.67 20.10 148.00 184.00 38.90 ZD-101 27.46 29.56 51.97 6.61 27.05 6.34 2.09 5.98 1.06 5.57 1.05 2.58 0.43 2.67 0.63 11.14 1.75 22.47 164.90 199.30 40.25 14SSZD-S1 28.50 29.30 54.70 6.69 27.20 6.11 2.01 6.09 0.97 5.44 1.04 2.78 0.41 2.44 0.37 − 1.56 20.70 151.00 196.00 40.80 ZD-202 28.86 31.26 56.35 6.78 27.53 6.12 2.15 5.81 0.97 5.82 1.07 2.93 0.44 2.83 0.47 19.19 1.66 21.52 153.10 155.70 41.29 ZD-203 29.10 32.99 58.52 7.05 28.69 6.30 2.22 6.09 1.01 5.99 1.12 3.06 0.47 2.93 0.48 10.12 1.64 21.26 152.70 147.20 39.92 18SS082-1 30.00 27.80 51.60 6.64 27.20 6.44 2.25 5.00 0.99 5.17 1.07 2.40 0.46 2.93 0.38 10.50 1.35 22.10 177.00 165.00 62.30 18SS082-2 30.60 28.10 53.60 6.69 27.30 6.17 2.17 5.28 0.99 4.90 1.07 2.42 0.47 2.84 0.37 7.57 1.71 21.90 185.00 173.00 60.50 王借岗 WJG-201 28.26 41.89 76.19 9.07 35.98 7.31 2.53 6.72 1.04 5.91 1.07 2.89 0.43 2.66 0.42 28.13 1.58 23.85 211.20 154.40 41.93 WJG-203 29.70 42.86 77.97 9.21 36.70 7.43 2.55 6.77 1.04 5.94 1.09 2.98 0.43 2.74 0.44 35.39 1.68 22.69 206.40 116.20 43.74 WJG-204 26.46 39.96 71.27 8.52 33.69 6.76 2.33 6.29 0.96 5.47 0.99 2.72 0.40 2.52 0.41 32.64 1.58 20.69 191.00 109.70 40.45 14SS012c 27.10 37.60 70.70 8.60 34.70 7.06 2.39 6.69 1.00 5.31 1.00 2.61 0.37 2.07 0.32 − 1.56 21.00 211.00 116.00 45.60 14SS012b 28.50 39.20 74.20 9.01 36.40 7.51 2.50 7.00 1.06 5.65 1.05 2.80 0.39 2.28 0.34 − 1.51 23.40 217.00 153.00 43.50 14SS012 26.10 37.20 70.00 8.48 34.20 7.02 2.38 6.54 0.99 5.23 0.97 2.53 0.35 2.01 0.30 − 1.50 20.70 197.00 119.00 38.20 18SS083-3 29.50 37.10 70.20 9.10 35.70 7.27 2.42 5.76 1.07 4.99 1.09 2.29 0.38 2.52 0.37 25.00 1.53 20.60 215.00 113.00 63.10 石头村 14SS004-2 24.20 24.00 49.70 6.48 27.40 6.19 2.16 5.96 0.92 5.01 0.91 2.40 0.34 1.98 0.29 − 1.25 24.30 240.00 67.30 42.00 18SS079-2 25.10 23.10 46.30 6.20 25.90 6.09 2.20 4.63 0.91 4.46 0.95 2.09 0.35 2.29 0.30 20.00 1.20 24.90 256.00 66.70 55.30 17SS060-1 29.20 26.20 51.80 6.84 29.60 6.47 2.17 6.08 1.14 6.00 1.12 2.90 0.46 2.72 0.38 18.50 1.38 25.40 284.00 69.30 40.40 17SS060-2 26.40 23.90 50.00 6.26 28.80 6.36 2.44 5.03 0.97 4.92 1.01 2.12 0.36 2.22 0.30 21.70 1.26 24.40 272.00 68.50 81.10 18SS079-1 25.10 22.80 48.40 6.09 27.30 6.34 2.13 4.65 0.93 4.71 1.00 2.12 0.34 2.35 0.31 16.50 1.20 24.60 263.00 72.90 58.10 18SS081-8 24.50 23.00 47.60 6.44 27.50 6.22 2.25 4.73 0.89 4.44 0.98 2.16 0.37 2.29 0.31 32.60 1.18 25.40 255.00 69.80 60.30 18SS081-7 25.80 23.80 50.50 6.17 28.00 6.44 2.32 4.85 0.99 4.54 0.99 2.14 0.37 2.36 0.30 16.30 1.20 23.90 248.00 66.10 58.20 邓群村 17SS063-2 51.40 38.00 86.30 10.50 47.80 10.90 3.86 10.50 1.94 10.30 1.93 5.09 0.81 4.79 0.67 14.00 1.49 29.50 176.00 40.20 38.90 19SS023-1 50.40 32.50 70.20 9.43 42.50 9.85 3.59 9.42 1.78 9.21 1.77 4.65 0.76 4.43 0.64 26.10 1.77 30.20 169.00 56.00 66.90 17SS063-1 45.90 35.10 76.20 10.20 45.00 11.00 4.07 7.81 1.58 8.48 1.74 3.75 0.66 3.89 0.58 14.30 1.50 30.10 168.00 43.00 64.00 样品编号 Ni Cu Zn Ga Rb Sr Nb Mo Cd In Cs Ba Ta W Tl Pb Bi Th U Zr Hf 紫洞 ZD-201-A 113.10 66.44 113.90 21.92 20.80 418.24 52.55 1.86 0.11 0.08 0.49 394.90 3.28 0.64 0.13 4.60 0.03 3.72 1.20 251.80 6.03 ZD-201 95.28 61.32 106.30 20.79 19.03 412.26 48.29 1.66 0.11 0.08 0.39 374.30 3.04 0.60 0.22 3.56 0.03 3.75 1.14 250.70 6.02 14SSZD-N 108.00 51.10 107.00 22.40 24.30 447.00 71.80 − − − 0.48 402.00 4.03 − − 2.41 − 3.82 1.02 256.00 5.82 14SSZD-S2 126.00 42.80 102.00 21.60 39.80 414.00 74.20 − − − 0.36 358.00 4.15 − − 2.60 − 4.27 1.15 276.00 6.18 ZD-101 108.20 67.06 113.10 22.37 40.96 412.96 55.07 1.60 0.13 0.08 0.37 363.00 3.41 0.51 0.16 3.89 0.03 3.63 1.29 250.80 5.79 14SSZD-S1 132.00 42.90 106.00 22.00 20.50 388.00 73.20 − − − 0.18 370.00 4.12 − − 2.91 − 4.27 1.14 280.00 6.22 ZD-202 92.68 44.73 102.38 21.65 20.92 444.70 54.92 2.64 − 0.08 0.42 398.29 3.17 0.53 0.11 3.12 0.02 16.47 1.18 263.40 5.72 ZD-203 86.10 40.65 105.70 21.91 34.93 410.00 54.40 2.81 − 0.09 0.31 367.21 3.13 0.60 0.12 3.29 0.01 10.29 1.23 239.90 5.35 18SS082-1 101.00 64.80 156.00 22.30 20.90 451.00 48.80 2.78 0.25 0.07 0.29 391.00 2.84 138.00 0.09 2.69 0.02 3.31 0.97 129.00 5.40 18SS082-2 108.00 62.60 161.00 22.70 24.50 437.00 50.00 3.10 0.22 0.07 0.14 367.00 2.91 116.00 0.07 2.09 0.01 3.14 0.89 137.00 5.68
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续表 3 样品编号 Ni Cu Zn Ga Rb Sr Nb Mo Cd In Cs Ba Ta W Tl Pb Bi Th U Zr Hf 王
借
岗WJG-201 79.57 38.12 101.91 19.07 34.53 774.80 69.84 1.77 − 0.08 0.97 693.93 2.92 0.44 0.10 8.75 0.03 7.99 1.10 181.80 4.13 WJG-203 77.06 38.47 88.04 19.86 33.45 825.20 74.20 2.90 − 0.08 1.01 739.07 3.54 0.47 0.10 3.19 0.02 12.40 1.23 202.70 4.37 WJG-204 72.94 34.16 87.37 18.78 31.68 829.50 70.36 1.73 − 0.07 0.90 742.93 3.70 0.45 0.09 3.00 0.02 17.89 1.13 192.30 4.32 14SS012c 93.70 36.80 83.40 19.30 46.10 895.00 90.20 − − − 0.55 572.00 5.07 − − 2.51 − 3.78 1.09 155.00 3.94 14SS012b 98.30 40.30 82.30 19.70 46.90 901.00 98.00 − − − 0.56 605.00 5.31 − − 2.71 − 3.89 1.67 168.00 4.34 14SS012 90.70 37.20 78.40 19.00 45.80 874.00 89.70 − − − 0.50 572.00 4.92 − − 2.44 − 3.81 1.36 150.00 3.94 18SS083-3 82.00 52.30 162.00 19.10 45.90 876.00 64.60 2.83 0.23 0.08 0.71 579.00 3.58 116.00 0.06 1.78 0.00 3.69 0.83 101.00 4.69 石
头
村14SS004-2 40.70 45.60 100.00 22.60 32.40 768.00 53.10 − − − 0.32 318.00 3.13 − − 2.57 − 2.55 0.73 187.00 4.56 18SS079-2 41.80 59.20 167.00 21.10 28.80 871.00 38.10 1.99 0.21 0.07 1.90 291.00 2.30 96.70 0.13 1.38 0.01 2.27 0.62 94.50 4.30 17SS060-1 34.70 49.00 116.00 21.40 22.50 914.00 41.10 1.77 0.09 0.07 1.23 699.00 2.57 0.35 0.06 2.03 0.01 2.71 0.75 258.00 5.55 17SS060-2 43.00 63.60 177.00 23.20 23.60 756.00 38.10 2.07 0.17 0.07 1.01 519.00 2.44 201.00 0.06 1.60 0.01 2.53 0.67 98.80 4.60 18SS079-1 40.00 62.20 171.00 22.00 27.20 693.00 39.90 2.03 0.17 0.07 1.61 329.00 2.24 109.00 0.10 4.08 0.00 2.41 0.63 98.80 4.17 18SS081-8 41.80 66.10 172.00 22.90 25.70 610.00 38.80 1.98 0.21 0.08 0.37 919.00 2.24 128.00 0.07 1.54 0.00 2.29 0.60 97.50 4.48 18SS081-7 42.80 63.80 167.00 21.50 26.80 603.00 37.70 1.90 0.21 0.07 0.58 407.00 2.33 107.00 0.07 1.48 0.01 2.44 0.67 93.30 4.51 邓
群
村17SS063-2 26.60 39.20 138.00 23.10 36.20 507.00 45.70 2.10 0.14 0.09 3.07 498.00 2.69 0.47 0.32 3.87 0.01 2.83 0.92 322.00 6.75 19SS023-1 31.10 35.70 143.00 22.70 23.00 447.00 41.10 2.16 0.27 0.12 11.50 411.00 2.99 177.00 0.36 6.70 0.03 4.17 0.85 266.00 7.16 17SS063-1 35.50 50.50 200.00 25.00 30.20 490.00 44.90 2.51 0.22 0.09 2.50 464.00 2.56 129.00 0.49 3.39 0.01 2.71 0.85 128.00 5.56
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表 4 三水盆地玄武岩稀土元素特征值
Table 4. The characteristic values for REE of basalts in Sanshui Basin
样品编号 ΣREE ΣLREE ΣHREE LREE/HREE δEu δCe (La/Sm)N (La/Yb)N (Sm/Nd)N (Gd/Yb)N ZD-201-A 148.66 127.53 21.13 6.035495 1.013754 0.859564 2.849535 7.062646 0.724878 1.748391 ZD-201 142.64 122.57 20.07 6.107125 1.024522 0.860597 2.813226 7.075381 0.739098 1.73334 14SSZD-N 143.71 123.83 19.88 6.228873 1.015499 0.912672 2.837208 7.828446 0.699607 2.077396 14SSZD-S2 143.2 123.96 19.24 6.442827 1.004446 0.912795 3.003865 7.897696 0.692596 1.946561 ZD-101 143.59 123.62 19.97 6.190285 1.022825 0.860257 2.932838 7.464105 0.721172 1.807326 14SSZD-S1 145.55 126.01 19.54 6.448823 0.997211 0.906555 3.016472 8.095849 0.691176 2.014067 ZD-202 150.53 130.19 20.34 6.400688 1.087079 0.891746 3.212998 7.447099 0.684009 1.656671 ZD-203 156.92 135.77 21.15 6.419385 1.082172 0.882131 3.293932 7.591005 0.675658 1.677244 18SS082-1 140.33 121.93 18.4 6.62663 1.169954 0.886326 2.715388 6.396785 0.728507 1.377047 18SS082-2 142.37 124.03 18.34 6.762814 1.134939 0.911961 2.864798 6.670718 0.695407 1.500245 WJG-201 194.11 172.97 21.14 8.182119 1.085293 0.900301 3.604673 10.61728 0.625134 2.03861 WJG-203 198.15 176.72 21.43 8.246384 1.080107 0.902901 3.628576 10.54596 0.62293 1.993814 WJG-204 182.29 162.53 19.76 8.225202 1.075467 0.88765 3.718362 10.69078 0.617394 2.014172 14SS012c 180.42 161.05 19.37 8.314404 1.04834 0.912494 3.350087 12.24622 0.626025 2.607968 14SS012b 189.39 168.82 20.57 8.207098 1.037952 0.916923 3.283364 11.5914 0.634827 2.477477 14SS012 178.2 159.28 18.92 8.418605 1.057321 0.9143 3.333333 12.47761 0.631579 2.625598 18SS083-3 180.26 161.79 18.47 8.75961 1.10633 0.894449 3.210055 9.925627 0.626589 1.844457 14SS004-2 133.74 115.93 17.81 6.509264 1.073424 0.942434 2.438897 8.172043 0.695115 2.429 18SS079-2 125.77 109.79 15.98 6.870463 1.219046 0.914375 2.385984 6.800817 0.723493 1.631519 17SS060-1 143.88 123.08 20.8 5.917308 1.042243 0.912052 2.54724 6.49407 0.672557 1.80377 17SS060-2 134.69 117.76 16.93 6.9557 1.275929 0.96382 2.363816 7.25821 0.679487 1.828359 18SS079-1 129.47 113.06 16.41 6.889701 1.148469 0.97032 2.262135 6.541112 0.714567 1.59673 18SS081-8 129.18 113.01 16.17 6.988868 1.220584 0.927874 2.326004 6.771376 0.695944 1.666757 18SS081-7 133.77 117.23 16.54 7.087666 1.219853 0.981563 2.324684 6.799071 0.707692 1.65835 17SS063-2 233.39 197.36 36.03 5.477658 1.089135 1.023809 2.192956 5.348508 0.701641 1.768888 19SS023-1 200.73 168.07 32.66 5.14605 1.124346 0.954037 2.075487 4.946115 0.713122 1.715907 17SS063-1 210.06 181.57 28.49 6.373113 1.27937 0.958246 2.007185 6.08334 0.752137 1.620123
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表 5 三水盆地岩浆熔融柱计算结果
Table 5. Calculation results of mantle melting column in Sanshui Basin
FeO8.0/% Na2O8.0/% FeOprim/% Na2Oprim/% P0 /GPa Pf /GPa T0 /℃ Tf /℃ F/ % Z0 /km Zf /km ZD 10.03 3.42 10.09 2.92 3.03 2.25 1 517 1 471 9.22 101.2873 76.6719 WJG 10.72 3.25 10.68 2.72 3.32 2.48 1 555 1 506 10.06 110.3925 84.01884 注：FeO8.0、Na2O8.0分别表示样品中的FeO、Na2O在MgO=8%时的含量；FeOprim、Na2Oprim分别表示样品所代表的母岩浆在未发生橄榄石分离结晶时FeO、Na2O的含量；P0、T0、Z0分别表示部分熔融作用发生时的初始压力、温度及深度；Pf、Tf、Zf分别表示部分熔融作用结束时的终止压力、温度及深度；F表示压力从P0下降至Pf的过程中的总部分熔融程度。
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表 6 地幔源区矿物组成及La、Yb、Sm总分配系数
Table 6. Mineral composition in mantle source and total partition coefficients of La, Yb and Sm
岩石类型 矿物相/% 总分配系数 橄榄石 单斜辉石 斜方辉石 石榴石 尖晶石 La Yb Sm 石榴石橄榄岩 0.54 0.09 0.17 0.2 0 0.00511278 0.86812 0.129968 尖晶石橄榄岩 0.46 0.18 0.28 0 0.08 0.00983922 0.11634 0.05835 三水盆地源区 0.51 0.14 0.24 0.06 0.05 0.00771757 0.336155 0.075927
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