Zircon U-Pb age, geochemistry and Hf isotope of two types of Late Ordovician super-aluminum granites in the Caojian area of western Yunnan, and its indication to Pan-African movement
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摘要:
滇西云龙县漕涧复式花岗岩体出露于保山地块北端东缘，由早奥陶世、晚奥陶世、晚白垩世、新近纪4期花岗岩组成。以晚奥陶世花岗质岩体为主体，主要岩性为中粒黑云二长花岗岩、似斑状中粗粒黑云二长花岗岩，岩石普遍发育片麻状构造。二者的LA-ICP-MS锆石U-Pb年龄分别为453.9±3.3 Ma和456.8±3.5 Ma。二者均属后碰撞环境的高钾钙碱性强过铝花岗岩，富集K、Rb等大离子亲石元素，亏损Zr、Ta、Nb、Th等高场强元素。在Sr-Yb图解上，前者属喜马拉雅型花岗岩，为下地壳环境较高压力条件下的部分熔融物；而后者属南岭型花岗岩，指示了中-上地壳环境较低压力条件下的部分熔融作用；在B-A图解上，前者显示白云母过铝花岗岩的趋势，岩浆的形成主要与隆升减压作用相关；而后者显示了含堇青石富黑云母过铝花岗岩的特点，岩浆的形成主要与深部地幔物质上涌导致的增温加热作用有关。锆石Hf同位素分析表明，前者εHf（t）=-11.65~0.28，平均为-6.36；后者εHf（t）=-11.61~-1.57，平均为-6.78，二者具有大致相当的源区，均为古老的地壳物质，但中粒黑云二长花岗岩中可能有少量地幔物质的加入。综合研究表明，在泛非运动的后碰撞阶段背景下，深部壳-幔物质相互作用的过程可能首先是隆升减压导致下地壳物质的低度部分熔融，随后地幔物质上涌，导致中-上地壳物质的增温加热的较高程度部分熔融。该两类晚奥陶世花岗岩属冈瓦纳大陆北缘的小地块之间相互挤压、碰撞的岩浆作用响应，也表明保山地块存在泛非运动。
Abstract:The Caojian complex granite located in Yunlong County of western Yunnan is exposed on the eastern edge of the northern end of the Baoshan block, which is composed of four period granites of Early Ordovician, Late Ordovician, Late Cretaceous and Neogene. The main Late Ordovician intrusive is lithologically made of medium grained biotite monzogranite and the porphyritic medium-coarse grained biotite monzogranite, in which gneissic structure is well developed. Zircon LA-ICP-MS U-Pb ages are 453.9±3.3 Ma and 456.8±3.5 Ma, respectively. Both belong to post-orogenic strongly-peraluminous high-K calcalkaline peraluminous granite with enrichment of K、Rb and other large ions lithophile element, but depletion of the high field strength element such as Zr, Ta, Nb, Th etc. According to the Sr-Yb diagram, the former belongs to the Himalayan granite, which is a partial melt under higher pressure in lower crust environment. The latter belongs to the Nanling granite, which indicates partial melting under the condition of lower pressure in the middle-upper crust environment. In the light of A-B diagram, the former shows the trend to muscovite peraluminous granite, and its magma is mainly related to uplift and decompression. The latter shows the characteristics of cordierite-bearing biotite-rich peraluminous granite, and its magma is mainly related to the warming and heating caused by upwelling of the deep mantle materials. Zircon Hf isotope analysis shows that the former yields εHf(t) value of 11.65~0.28, averaging -6.36. The latter gives εHf(t) value of 11.61~-1.57, averaging -6.78. Both share the roughly equivalent source regions, and are ancient crustal materials, with a small amount of mantle material added to the medium grained biotite monzogranite. It shows that the process of deep crust-mantle interaction may be firstly uplift and decompression leading to lower crust materials low-degree partial melting, not far behind, because to upwelling of mantle materials, warmed and heated medium-upper crust materials happened to higher-degree partial melting, in the background of the post-collision phase of thePan-African movement. The two types of the Late Ordovician granites are the magmatism responses of mutual extrusion and collision between small blocks on the northern edge of Gondwana continent, it shows that there is the Pan-African movement in Baoshan block.
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Keywords:
- western Yunnan /
- Caojian complex granite /
- Late Ordovician /
- zircon U-Pb age /
- Hf isotope /
- Pan-African movement /
- Baoshan block
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致谢: 项目组成员参加了野外调查和研究工作，锆石测年样品的制备和分析得到河北省廊坊市宇恒矿岩技术服务有限公司和湖北省地质实验室测试中心的大力支持，岩石地球化学方面的测试为自然资源部昆明矿产资源监督检测中心和湖北省地质实验室测试中心完成，锆石原位Hf同位素分析在武汉上谱分析科技有限责任公司实验室完成，成文过程中得到李静、张虎两位正高级工程师和审稿专家的悉心指导，在此一并表示衷心的感谢。
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图 1 研究区区域地质背景简图(国境线据中国地图GS(2019)3333号图件修编)
Figure 1. Schematic diagram of regional geological background in the study area
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图 2 漕涧复式岩体晚奥陶世花岗岩的野外照片(a、b)和镜下显微照片(c、d，正交偏光)
Pl—斜长石；Mic—钾长石；Bi—黑云母；Qz—石英；Sm+1中Sm表示主期面理，+1表示新生面理
Figure 2. Field photographs(a, b)and microscopic photographs(c, d)of Late Ordovician granite from Caojian complex
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图 3 漕涧复式岩体晚奥陶世花岗岩锆石U-Pb年龄谐和图(a、c)和阴极发光(CL)图像(b、d)
Figure 3. U-Pb zircon age harmonic diagrams(a, c)and CL images(b, d)of Late Ordovician granites, from Caojian complex
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图 4 漕涧复式岩体中奥陶世花岗岩SiO2-K2O图解(a)和A/CNK-A/NK图解(b)
Figure 4. SiO2-K2O(a)and A/CNK-A/NK(b)diagrams of Late Ordovician granites from Caojian complex
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图 5 漕涧复式岩体晚奥陶世花岗岩稀土元素配分曲线(a)和微量元素蛛网图(b)
Figure 5. Chondrite-normalized REE patterns(a)and trace elements spider diagrams(b)of Late Ordovician granites from Caojian complex
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图 6 漕涧复式岩体晚奥陶世花岗岩Hf同位素组成
Figure 6. Hf isotopic composition of Late Ordovician granites from Caojian complex
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图 7 漕涧复式岩体晚奥陶世花岗岩B-A(a)和Yb-Sr(b)图解
Figure 7. B-A(a) and Yb-Sr(b) diagrams of Late Ordovician grenites from Caojian complex
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图 8 漕涧复式岩体晚奥陶世花岗岩Rb/30-Hf-3Ta(a)和R1-R2(b)图解
Figure 8. Rb/30-Hf-3Ta(a) and R1-R2(b) diagrams of Late Ordovician granites from Caojian complex
表 1 漕涧复式岩体晚奥陶世花岗岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1 Results of LA-ICP-MS zircon U-Th-Pb analysis of Late Ordovician granites from Caojian complex
测点号 元素/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207 Pb/ 206 Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D0114-1-1(中粒二长花岗岩，ηγaO3)：18个测点 年龄加权平均值为453.9±3.3 Ma(MSWD=0.49，n=14) 1 103.2 134.2 1435.0 0.10 0.0567 0.0010 0.5720 0.0127 0.0728 0.0011 479.7 37.0 459.3 8.2 453.1 6.9 2 64.4 134.7 420.5 0.35 0.0568 0.0011 0.5946 0.0133 0.0758 0.0012 483.4 42.6 473.8 8.5 471.3 7.3 3 79.1 194.0 618.0 0.35 0.0578 0.0011 0.5870 0.0130 0.0736 0.0012 520.4 40.7 468.9 8.3 457.7 7.0 4 71.4 221.3 291.5 0.82 0.0582 0.0016 0.5980 0.0231 0.0740 0.0014 538.9 59.3 476.0 14.7 459.9 8.5 5 125.1 317.9 1226.5 0.28 0.0568 0.0011 0.5676 0.0136 0.0723 0.0012 483.4 42.6 456.5 8.8 449.8 7.2 6 70.1 180.1 497.1 0.40 0.0599 0.0018 0.6031 0.0166 0.0731 0.0014 611.1 32.4 479.2 10.5 454.7 8.2 7 269.6 772.8 1396.9 0.56 0.0580 0.0012 0.5864 0.0125 0.0733 0.0010 527.8 44.4 468.6 8.0 455.8 6.3 8 78.1 167.0 782.1 0.17 0.0564 0.0015 0.5711 0.0119 0.0733 0.0010 477.8 59.3 458.8 7.7 456.2 6.0 9 67.5 134.5 826.5 0.15 0.0568 0.0012 0.5751 0.0114 0.0734 0.0010 483.4 48.1 461.3 7.4 456.3 6.0 10 86.6 132.3 1285.9 0.09 0.0571 0.0011 0.5781 0.0093 0.0734 0.0008 494.5 42.6 463.2 6.0 456.5 5.0 11 82.6 138.1 1179.0 0.10 0.0568 0.0010 0.6240 0.0123 0.0798 0.0013 483.4 40.7 492.3 7.7 494.6 7.8 12 69.3 119.2 970.2 0.11 0.0573 0.0010 0.5793 0.0113 0.0732 0.0010 505.6 38.9 464.0 7.2 455.7 5.8 13 134.1 381.4 869.8 0.38 0.0569 0.0010 0.6239 0.0137 0.0795 0.0013 487.1 34.3 492.3 8.5 493.4 7.7 14 124.8 193.6 2016.2 0.09 0.0569 0.0012 0.5540 0.0119 0.0708 0.0011 487.1 44.4 447.6 7.7 440.8 6.8 15 158.5 396.4 1350.2 0.25 0.0574 0.0009 0.5772 0.0112 0.0728 0.0010 505.6 35.2 462.7 7.2 453.2 5.8 16 93.8 129.8 1475.9 0.08 0.0584 0.0009 0.5881 0.0105 0.0730 0.0009 542.6 34.1 469.7 6.7 454.3 5.5 17 58.3 93.2 711.8 0.11 0.0578 0.0011 0.5744 0.0104 0.0721 0.0010 520.4 40.7 460.9 6.7 448.9 6.0 18 179.8 555.0 601.5 0.78 0.0581 0.0013 0.6253 0.0140 0.0782 0.0012 531.5 51.8 493.2 8.8 485.1 7.5 PM006-12-1(似斑状中粗粒二长花岗岩，ηγbO3)：19个测点 年龄加权平均值为456.8±3.5 Ma(MSWD=1.2，n=16) 1 76.4 122.6 608.6 0.19 0.0564 0.0010 0.5725 0.0117 0.0735 0.0011 464.9 38.9 459.6 7.6 457.4 6.8 2 120.1 255.3 941.8 0.26 0.0561 0.0009 0.5690 0.0100 0.0734 0.0010 457.5 33.3 457.4 6.5 456.5 6.0 3 81.1 152.5 711.7 0.21 0.0568 0.0009 0.5776 0.0103 0.0735 0.0010 483.4 33.3 462.9 6.7 457.4 6.0 4 94.0 141.1 1101.9 0.13 0.0575 0.0008 0.5756 0.0083 0.0724 0.0009 522.3 27.8 461.6 5.4 450.9 5.4 5 85.9 202.1 672.9 0.30 0.0565 0.0008 0.5914 0.0122 0.0755 0.0011 472.3 31.5 471.7 7.8 469.0 6.8 6 99.0 124.1 1489.0 0.08 0.0576 0.0008 0.5856 0.0088 0.0736 0.0009 522.3 31.5 468.1 5.7 457.9 5.4 7 71.3 138.0 684.7 0.20 0.0577 0.0009 0.5874 0.0112 0.0736 0.0010 520.4 35.2 469.2 7.2 457.6 6.0 8 61.8 105.4 761.8 0.14 0.0557 0.0009 0.5855 0.0114 0.0759 0.0011 442.6 35.2 468.0 7.3 471.7 6.4 9 67.7 123.3 800.6 0.15 0.0566 0.0009 0.5894 0.0108 0.0754 0.0011 476.0 35.2 470.5 6.9 468.7 6.8 10 131.1 158.3 2106.6 0.07 0.0571 0.0007 0.5717 0.0087 0.0723 0.0008 494.5 23.1 459.1 5.6 450.2 5.1 11 85.8 175.1 829.0 0.20 0.0569 0.0009 0.5779 0.0109 0.0736 0.0012 487.1 35.2 463.1 7.0 457.7 7.0 12 58.4 102.4 556.6 0.18 0.0575 0.0011 0.5838 0.0128 0.0735 0.0012 509.3 42.6 466.9 8.2 457.3 7.2 13 71.1 124.4 708.6 0.16 0.0562 0.0011 0.5697 0.0137 0.0735 0.0014 457.5 44.4 457.8 8.9 457.2 8.4 14 147.8 146.7 2760.7 0.05 0.0575 0.0010 0.5834 0.0147 0.0734 0.0016 509.3 38.9 466.6 9.4 456.4 9.3 15 98.5 145.6 1420.8 0.09 0.0572 0.0009 0.5728 0.0102 0.0725 0.0010 501.9 67.6 459.9 6.6 451.0 6.3 16 73.4 133.2 881.8 0.15 0.0591 0.0011 0.5743 0.0154 0.0702 0.0014 572.3 42.6 460.8 9.9 437.4 8.2 17 61.2 107.8 774.1 0.13 0.0569 0.0010 0.5788 0.0115 0.0737 0.0011 487.1 38.9 463.7 7.4 458.4 6.8 18 71.6 128.3 818.4 0.15 0.0572 0.0009 0.5714 0.0106 0.0724 0.0011 498.2 33.3 458.9 6.9 450.8 6.6 19 147.9 353.4 947.3 0.34 0.0578 0.0009 0.5847 0.0110 0.0733 0.0011 520.4 39.8 467.5 7.0 456.1 6.5 
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表 2 漕涧复式岩体晚奥陶世花岗岩主量、微量和稀土元素分析结果
Table 2 Analyical results of major, trace elements and REE of Late Ordovician granites from Caojian complex
元素 D0319- 1-1 D0114- 1-1-1 D0114- 1-1-2 PM006- 37-1 PM006- 33-1 D3016- 1-1-1 D3016- 1-1-2 D3017- 1-1-1 D3017- 1-1-2 PM012- 7-1 PM006 -4-2 PM006- 9-1 PM006- 10-1 PM006- 12-1 PM006- 27-1 PM006- 59-1 PM006- 6-1 PM006- 19-1 中粒二长花岗岩(ηγaO3) 似斑状中粗粒二长花岗岩(ηγbO3) SiO2 76.17 74.42 75.33 73.6 76.09 75.52 75.83 76.06 76.16 73.81 72.49 70.35 70.12 71.38 70.69 72.22 75.32 70.86 TiO2 0.17 0.17 0.17 0.17 0.21 0.10 0.07 0.13 0.12 0.33 0.43 0.57 0.52 0.62 0.51 0.51 0.4 0.55 Al2O3 12.52 13.29 13.19 13.2 12.67 13.64 13.43 12.80 12.81 12.69 13.62 13.15 13.32 13.41 13.49 13.46 11.65 13.13 Fe2O3 1.82 1.02 0.81 1.67 1.48 0.37 0.35 0.38 0.39 0.45 0.91 1.40 1.43 2.33 1.36 1.61 1.07 1.66 FeO 0.92 0.72 0.69 0.75 0.96 0.92 0.82 1.02 1.05 2.33 2.45 2.57 2.52 2.17 2.66 2.68 2.08 2.9 MnO 0.03 0.02 0.02 0.032 0.036 0.05 0.05 0.05 0.06 0.04 0.05 0.06 0.056 0.064 0.058 0.055 0.048 0.058 MgO 0.32 0.46 0.37 0.29 0.36 0.26 0.17 0.28 0.28 0.58 0.83 1.09 0.99 1.24 0.97 0.89 0.76 1.08 CaO 0.73 0.82 0.79 0.75 0.73 0.18 0.20 0.43 0.44 1.40 1.65 1.82 1.61 1.96 1.41 1.54 1.41 1.90 Na2O 3.13 3.26 3.08 2.94 2.6 2.69 2.69 2.84 2.83 2.46 2.77 2.82 2.82 2.35 2.27 2.50 2.00 2.85 K2O 4.48 5.44 5.05 5.3 4.89 4.52 4.56 4.72 4.71 4.46 4.77 3.23 3.55 3.15 5.19 5.17 3.67 3.26 P2O5 0.18 0.16 0.17 0.15 0.11 0.16 0.17 0.16 0.16 0.25 0.16 0.17 0.15 0.18 0.21 0.16 0.13 0.17 H2O+ 0.32 0.40 0.42 1.03 0.36 1.26 1.33 0.64 0.66 0.91 0.22 0.91 0.73 1.36 0.55 0.35 0.59 0.64 H2O- 0.10 0.07 0.04 0.22 0.13 0.34 0.26 0.21 0.17 0.21 0.05 0.26 0.15 0.29 0.13 0.15 0.18 0.18 CO2 0.03 0.05 0.02 0.16 0.26 0.025 0.049 0.025 0.025 0.048 0.25 0.30 0.24 0.36 0.20 0.15 0.28 0.22 烧失量 0.37 0.56 0.63 0.94 0.84 1.32 1.20 0.86 0.72 0.71 0.50 1.18 0.90 1.68 0.87 0.43 0.90 0.90 La 16.7 13.4 12.9 17.6 21.0 5.20 5.67 10.96 12.01 41.0 34.6 45.7 40.0 58.5 37.6 33.3 33.1 46.2 Ce 40.3 27.9 26.7 35.1 43.4 10.49 11.10 22.43 24.82 85.5 72.0 93.4 83.7 108 78.1 69.3 66.4 93.4 Pr 4.20 3.32 3.25 4.60 5.37 1.44 1.62 2.91 3.16 10.2 8.91 11.4 10.4 14.9 9.84 8.70 8.28 11.6 Nd 16.1 12.5 12.2 17.7 19.8 5.87 5.82 10.56 11.12 38.3 34.5 43.8 40.6 57.7 38.2 33.4 31.8 44.5 Sm 4.05 2.90 2.93 4.19 4.67 1.73 1.82 2.98 3.08 8.49 7.20 9.01 8.44 11.7 8.21 7.04 6.74 9.01 Eu 0.35 0.37 0.35 0.49 0.43 0.17 0.11 0.23 0.26 1.17 1.02 1.07 1.19 1.59 0.99 1.10 0.79 1.09 Gd 3.56 2.91 2.84 4.14 4.58 1.91 1.84 3.28 3.44 8.10 6.75 8.46 7.91 10.9 7.68 6.67 6.29 8.25 Tb 0.70 0.55 0.55 0.86 0.97 0.35 0.35 0.60 0.65 1.51 1.15 1.46 1.34 1.86 1.38 1.19 1.07 1.39 Dy 4.18 3.32 3.26 5.28 6.01 2.27 2.39 4.24 4.23 9.91 6.38 8.50 7.91 10.5 7.99 7.15 6.05 7.69 Ho 0.75 0.59 0.60 0.95 1.10 0.49 0.47 0.84 0.86 1.98 1.19 1.68 1.53 1.94 1.52 1.42 1.13 1.43 Er 1.98 1.62 1.68 2.56 2.91 1.35 1.27 2.29 2.33 5.71 3.28 4.79 4.20 5.24 3.97 4.10 2.94 3.99 Tm 0.32 0.24 0.25 0.34 0.39 0.21 0.20 0.32 0.32 0.78 0.45 0.67 0.56 0.69 0.51 0.55 0.39 0.53 Yb 2.03 2.03 2.11 2.05 2.27 1.31 1.22 1.79 1.88 4.72 2.77 4.15 3.45 4.08 2.96 3.50 2.28 3.19 Lu 0.25 0.25 0.25 0.28 0.31 0.18 0.18 0.25 0.26 0.70 0.39 0.58 0.50 0.57 0.42 0.49 0.32 0.46 Y 21.0 21.9 22.1 27.2 31.5 13.46 13.11 24.42 24.56 51.8 30.2 43.5 38.0 50.6 39.0 36.8 29.2 36.9 ∑REE 116.4 93.8 92.0 123.3 144.7 46.4 47.2 88.1 93.0 270.5 210.7 278.1 249.7 338.3 238.4 214.8 196.8 269.7 Zr 78.2 81.2 80.6 88.0 95.6 44.6 43.2 66.1 68.2 195.0 151.7 211.6 196.2 255.6 185.9 182.1 136.3 211.4 Zn 45.9 20.2 17.1 30.88 32.79 39.71 39.78 29.96 28.14 59.2 44.81 57.87 55.23 63.35 57.87 47.80 44.13 56.13 V 12.2 22.3 24.3 35.53 36.69 11.6 4.7 9.2 9.3 20.5 47.15 60.23 58.08 59.37 52.77 55.25 50.85 56.84 Th 16.9 11.4 9.9 14.03 17.19 6.24 6.20 11.15 8.74 18.6 22.31 28.59 26.03 30.96 25.06 22.56 21.18 27.25 Sc 7.15 4.82 5.37 6.26 6.38 5.00 4.19 4.32 3.89 6.21 7.95 10.33 9.58 10.71 9.13 8.95 7.72 9.81 Sr 39.2 66.0 65.9 76.39 61.61 30.3 23.6 29.8 28.0 84.2 76.96 78.86 81.57 70.48 68.47 88.37 55.75 76.11 Rb 357 259 258 283.4 278.2 481.7 516.1 373.1 350.8 176 221.5 162.1 299.4 189.3 263.0 227.8 189.4 197.3 Ni 4.94 3.16 3.25 5.41 4.34 3.1 2.0 2.5 2.1 5.76 8.16 9.60 8.68 12.79 10.20 9.48 7.63 11.88 Nb 15.0 13.5 13.6 14.21 16.90 12.80 13.93 10.16 9.19 17.0 15.26 19.11 16.90 19.43 19.28 16.12 14.04 18.05 Cu 5.94 4.61 4.11 14.97 25.63 9.76 4.79 3.44 3.40 5.32 57.00 73.44 67.05 105.2 82.71 25.22 70.61 52.75 Cr 16.2 6.16 6.60 7.76 7.37 4.4 2.7 4.1 3.6 10.9 15.94 22.92 22.77 21.20 18.90 19.55 17.27 24.60 Co 2.56 21.6 25.6 2.52 2.74 2.01 0.95 1.80 1.56 3.69 5.57 7.81 6.87 8.45 5.77 6.99 5.99 7.22 Ba 172 268 237 252.3 196.5 37 33.7 78 68 609 645.4 473.3 716.8 352.7 626.2 839.9 286.1 365.1 Hf 5.11 4.19 3.50 4.72 7.29 4.7 4.7 4.1 4.2 4.7 9.75 15.35 6.52 18.87 7.97 9.62 8.96 11.37 Ta 1.48 1.99 2.29 1.57 2.52 4.44 5.27 1.84 1.94 1.73 1.50 1.68 1.38 1.56 1.68 1.23 1.34 1.61 U 6.05 3.81 3.00 5.87 7.05 3.91 3.21 3.29 5.68 2.76 2.28 2.53 3.15 3.46 4.75 2.82 2.58 3.60 Pb 31.5 11.0 13.2 31.43 28.77 13.05 12.91 24.70 22.90 29.5 32.19 26.32 29.85 21.52 32.41 35.17 25.34 22.90 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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表 3 漕涧复式岩体晚奥陶世花岗岩锆石Lu-Hf同位素组成
Table 3 Zircon Lu-Hf isotopic compositions of Late Ordovician granites from Caojian complex
测点号 176Hf/177Hf 1σ 176Lu/177Hf 176Yb/177Hf 年龄/Ma εHf(t) tDM2/Ma 样品：D0114-1-1(中粒二长花岗岩，ηγaO3)，16个测点 1 0.282272 0.000012 0.003362 0.113807 453.1 -8.74 1476 2 0.282400 0.000011 0.001557 0.052312 471.3 -3.28 1223 3 0.282331 0.000011 0.002963 0.099929 457.7 -6.44 1373 5 0.282274 0.000013 0.002898 0.089091 449.8 -8.59 1454 6 0.282311 0.000010 0.001915 0.064862 454.7 -6.89 1363 7 0.282349 0.000017 0.003410 0.107901 455.8 -5.97 1363 8 0.282313 0.000011 0.002516 0.085391 456.2 -6.97 1382 9 0.282323 0.000009 0.002115 0.074838 456.3 -6.49 1353 10 0.282297 0.000014 0.002369 0.071411 456.5 -7.48 1400 11 0.282436 0.000010 0.001755 0.060555 494.6 -1.57 1178 12 0.282218 0.000014 0.003458 0.115773 455.7 -10.63 1561 13 0.282407 0.000013 0.001540 0.048189 493.4 -2.55 1212 15 0.282357 0.000010 0.002110 0.074469 453.2 -5.35 1303 16 0.282191 0.000017 0.003608 0.114469 454.3 -11.65 1608 17 0.282247 0.000014 0.002337 0.072042 448.9 -9.40 1471 18 0.282500 0.000011 0.002446 0.075493 485.1 0.28 1106 样品：PM006-12-1(似斑状中粗粒二长花岗岩，ηγbO3)，15个测点 1 0.282297 0.000010 0.002356 0.073152 457.4 -8.65 1399 2 0.282362 0.000009 0.002054 0.065267 456.5 -6.46 1294 3 0.282324 0.000009 0.002651 0.085745 457.4 -8.44 1371 4 0.282316 0.000008 0.003263 0.101955 450.9 -6.97 1406 5 0.281986 0.000029 0.001519 0.046398 471.3 -3.28 1807 6 0.282005 0.000016 0.002484 0.075600 457.9 -5.93 1827 7 0.282282 0.000008 0.002059 0.065822 457.6 -6.94 1409 8 0.282398 0.000009 0.002280 0.069062 494.6 -1.57 1250 9 0.282341 0.000009 0.000895 0.026983 493.4 -2.55 1284 10 0.282274 0.000009 0.003569 0.115270 450.2 -6.62 1482 11 0.282309 0.000009 0.001934 0.062157 457.7 -7.46 1366 12 0.282334 0.000009 0.001692 0.054063 457.3 -10.59 1322 13 0.282254 0.000009 0.001064 0.034355 457.2 -5.27 1411 14 0.282194 0.000009 0.002602 0.084404 456.4 -11.61 1559 15 0.282308 0.000009 0.002888 0.094373 451.0 -9.36 1404
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