LA-ICP-MS zircon U-Pb dating and genetic types of uranium-bearing granite porphyry in northern Xiangshan orefield, Jiangxi Province
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摘要:
相山铀矿田是中国迄今为止发现的最大的火山岩型铀矿床，其北部主要铀矿类型为花岗斑岩型铀矿床，铀成矿在时空和成因上与超淺成侵入相的花岗斑岩有关。前人多针对某一具体矿床含矿主岩开展工作，获得的花岗斑岩成岩年龄数据相差较大，影响了对相山花岗斑岩型铀矿的深入研究。选择相山北部横涧、游坊、沙洲、云际等铀矿床的含矿主岩——花岗斑岩系统开展野外地质调查、地球化学特征和LA-ICP-MS锆石U-Pb定年研究，以期厘定相山花岗斑岩型铀矿床含矿主岩的成岩时代和成因类型。花岗斑岩LA-ICP-MS锆石U-Pb定年结果显示，横涧、游坊、沙洲、云际的花岗斑岩206Pb/238U年龄加权平均值分别为135.6±1.3Ma（MSWD=0.45，n=26）、136.2±1.3Ma（MSWD=1.2，n=21）、133.4±11Ma（MSWD=0.67，n=24）及134.3±1.1Ma（MSWD=0.88，n=25），集中在132~137Ma之间，属于早白垩世。研究认为，相山北部花岗斑岩成因类型界于A型花岗岩与S型花岗岩之间的过渡型，为A-S型花岗岩。花岗斑岩岩浆起源于中元古代地壳，地壳物质作为主要成分参与了花岗斑岩的形成，同时有少量地幔物质的加入。花岗斑岩为板内构造界境下伸展体制的产物，可能是由于太平洋板块俯冲后，因板块后撤导致岩浆侵入作用的结果。
Abstract:The Xiangshan uranium orefield is the largest volcanic rock type uranium deposit so far found in China. The main uraniumore type in the north is the granite porphyry type uranium deposit.The uranium mineralization is related to the ultra-hallow intrusion-phase granite porphyry in time and space.Most of the previous work was aimed at the main rocks in a single deposit, and the age date of granite porphyry obtained were quite different, which has affected the in-depth study of Xiangshang granite porphyry uranium orefield. In this paper, the main mineral-granitic porphyry system of the uranium deposits in the northern part of Xiangshan, including Hengian, Youfang, Shazhou and Yunji, was selected to carry out field geological survey, geochemical characteristics study and LA-IXP-MS zircon U-Pb dating, with the purpose of determining the petrogenetic age and genesis type of one-bearing main rocks in Xiangshan granite porphyry uranium deposit.The weighted mean 206Pb/238U ages of granite of Hengjian, Youfang, Shazhou and Yunji are 135.6±1.3Ma (MSWD=0.45, n=26), 136.2±1.3Ma(MSWD=1.2, n=21Ma(MSWD=0.67, n=24) and 134.3±1.1Ma(MSWD=0.88, n=25) respectively, concentrated on the range of 132~137Ma, suggesting the Early Cretaceous period. It is concluded that the original type of granitic porphyry in the north of Xianghan is bounded by the transition type between A-type granite and S-type granite, named A-S granite. Granite porphyry magma originated from the Middle Proterozoic crust. Crustal material, as the main component, was involved in the formation of porphyry, with the addition of a small amount of mantle materal.The granite porphyry was formed by the stretching system under the intraplate tectonic environment.It might have been the effect of magmatic intrusion due to plate retreat after the Pacific plate subduction.
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Keywords:
- uranium granite porphyry /
- zircon U-Pb dating /
- Early Cretaceous /
- A-S granite /
- northern Xiangshan
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致谢: 感谢导师和项目组成员的帮助，以及审稿专家提出宝贵的建议。
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图 1 相山地区花岗斑岩分布简图(据参考文献[14]修改)
1—第四系粘土；2—上白垩统砂岩、砂砾岩；3—下白垩统鹅湖岭组碎斑熔岩；4—下白垩统鹅湖岭组晶屑凝灰岩、砂砾岩；5—下白垩统打鼓顶组流纹英安岩；6—下白垩统打鼓顶组砂岩、熔结凝灰岩；7—上三叠统石英砂岩、页岩；8—新元古界片岩、千枚岩；9—加里东期花岗岩；10—花岗斑岩；11—断裂；12—采样位置
Figure 1. Granite porphyry distribution diagram of Xiangshan
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图 2 相山北部花岗斑岩手标本(a)及显微镜下照片(b~d)
a—相山横涧XS15-03花岗斑岩样品照片；b—花岗斑岩似斑状结构，黑云母发生绿泥石化现象；c—花岗斑岩中的似斑状结构；d—花岗斑岩球粒结构和文象结构；Kfs—钾长石; Pl—斜长石; Q—石英; Bt—黑云母; Chl—绿泥石; Cal—方解石; Ser—绢云母; Cb—碳酸盐矿物
Figure 2. Photographs of the granitic porphyry in northern Xiangshan area under the microscope
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图 3 相山北部花岗斑岩Harker图解
Figure 3. Harker diagrams for the granite porphyries form northern Xiangshan
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图 4 相山北部花岗斑岩微量元素原始地幔标准化蛛网图[19]
Figure 4. Primitive-normalized trace element spidergrams for the granite porphyries in northern Xiangshan
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图 5 相山北部各个地区花岗斑岩代表性锆石阴极发光(CL)图像和分析点位(实线圆代表U-Pb年龄测试位置)
Figure 5. CL images of representative zircon grains of the granite porphyry from the the northern Xiangshan area
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图 6 花岗斑岩锆石U-Pb谐和图及206Pb/238U年龄平均值图解
Figure 6. U-Pb concordia diagrams and 206Pb/238U ages of zircons from granite porphyry
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图 7 相山北部花岗斑岩K2O-Na2O岩石系列划分图
Figure 7. Discriminant diagrams of K2O-Na2O of the granite porphyry in the northern area of Xiangshan
表 1 花岗斑岩样品采集位置与性质
Table 1 Collection location and lithology of granite porphyry samples
序号 样号 采集点 北纬 东经 岩石性质 1 XS15-03 横涧 27°36′31″ 115°55′34″ 花岗斑岩 2 XS15-05 游坊 27°35′46″ 115°57′58″ 花岗斑岩 3 XS15-07 沙洲 27°36′50″ 115°58′46″ 花岗斑岩 4 XS15-11 云际 27°34′55″ 116°00′54″ 花岗斑岩 
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表 2 相山北部地区花岗斑岩主量元素分析结果
Table 2 Analyses of main elements of granite porphyry in northern Xiangshan
% 样品号 岩性 产地 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 烧失量 总计 资料来源 岩性 产地 DI SI A/CNK A/NK AR σ ALK K2O/Na2O C 资料来源 XS-15-01 花岗斑岩 横涧 69.79 0.23 14.15 1.92 1.52 0.07 0.37 2.23 2.42 5.80 0.06 2.88 99.76 本文 花岗斑岩 横涧 83.49 3.11 0.99 1.38 3.01 2.50 8.22 2.40 0.00 本文 XS-15-03 64.95 0.54 15.56 3.88 3.36 0.08 0.78 2.59 2.87 5.75 0.15 2.80 99.57 76.22 4.69 0.99 1.42 2.81 3.40 8.62 2.00 0.27 XS-9 73.43 0.19 12.82 0.64 0.95 0.07 0.33 1.51 2.46 5.21 0.05 2.33 99.99 [13] 88.81 3.44 1.03 1.32 3.30 1.92 7.67 2.12 0.52 [13] XS-12 75.05 0.07 12.41 1.65 0.60 0.02 0.17 1.11 2.74 4.25 0.06 0.96 99.09 89.77 1.82 1.12 1.36 3.14 1.52 6.99 1.55 1.46 XS-18 75.68 0.07 12.26 0.92 0.85 0.02 0.28 0.23 2.56 4.96 0.03 1.59 99.45 93.49 2.93 1.23 1.28 4.03 1.72 7.52 1.94 2.38 XS-21 74.23 0.08 12.17 1.24 0.35 0.07 0.27 1.07 3.57 5.34 0.08 1.50 99.97 94.14 2.52 0.90 1.04 5.12 2.53 8.91 1.50 0.00 XS-22 73.81 0.18 13.16 1.67 1.00 0.04 0.30 1.26 2.14 4.95 0.05 1.83 100.39 87.36 3.00 1.18 1.48 2.93 1.62 7.09 2.31 2.14 XS-24 72.32 0.09 14.32 1.61 0.75 0.04 0.18 1.90 2.18 5.28 0.71 0.99 100.37 86.67 1.81 1.12 1.54 2.70 1.89 7.46 2.42 3.29 XS-25 74.33 0.06 13.54 1.72 0.50 0.09 0.18 0.29 2.24 5.57 0.10 1.31 99.93 91.92 1.78 1.32 1.39 3.59 1.94 7.81 2.49 3.59 XS-15-05 花岗斑岩 游坊 66.19 0.53 15.30 3.65 3.10 0.08 0.75 2.22 2.70 5.97 0.14 2.36 99.54 本文 花岗斑岩 游坊 78.30 4.68 1.02 1.40 2.96 3.26 8.67 2.21 0.69 本文 XS-15-06 66.04 0.48 15.50 3.68 2.72 0.12 0.73 2.95 2.66 5.04 0.15 2.58 99.62 74.90 4.92 1.02 1.57 2.43 2.57 7.70 1.89 0.66 XS-15-07 花岗斑岩 沙洲 64.50 0.65 15.52 4.58 3.75 0.06 1.03 2.62 3.02 5.56 0.21 2.15 99.48 本文 花岗斑岩 沙洲 74.54 5.77 0.99 1.41 2.79 3.47 8.58 1.84 0.26 本文 XS-15-08 65.12 0.58 15.46 3.94 3.24 0.06 0.83 2.43 2.69 5.91 0.16 2.67 99.50 76.66 5.04 1.01 1.43 2.85 3.36 8.60 2.20 0.61 XS-15-09 66.80 0.53 15.01 4.05 3.41 0.06 0.79 2.40 2.84 5.73 0.16 1.54 99.53 77.34 4.69 0.99 1.38 2.94 3.13 8.57 2.02 0.15 XS-15-10 68.04 0.48 14.59 3.60 3.22 0.05 0.67 2.26 2.84 5.72 0.14 1.57 99.60 花岗斑岩 沙洲 79.24 4.16 0.97 1.34 3.07 2.96 8.56 2.01 0.00 本文 D6576-1 72.03 0.27 13.41 0.79 1.03 0.04 0.38 1.72 2.70 5.38 0.06 0.72 98.53 87.83 3.70 1.00 1.30 3.29 2.23 8.08 1.99 0.16 D6575-1 74.70 0.25 13.16 1.01 0.98 0.03 0.36 0.32 2.39 5.55 0.05 0.68 99.48 92.21 3.50 1.25 1.32 3.87 1.98 7.94 2.32 2.79 T326-1 72.39 0.25 13.73 0.45 1.48 0.05 0.30 1.88 2.90 5.20 0.10 0.95 99.68 86.88 2.90 0.99 1.32 3.16 2.22 8.10 1.79 0.15 T326-2 71.07 0.32 14.30 0.62 1.82 0.04 0.49 1.84 2.75 5.33 0.07 0.72 99.37 85.04 4.45 1.05 1.39 3.00 2.31 8.08 1.94 0.84 T68-1 69.17 0.43 13.29 0.75 2.70 0.05 0.54 2.38 2.69 5.28 0.10 2.00 99.38 82.68 4.52 0.92 1.31 3.07 2.39 7.97 1.96 0.00 XS-15-11 花岗斑岩 云际 66.37 0.51 15.12 3.67 3.04 0.06 0.69 2.49 2.92 5.43 0.14 2.51 99.57 本文 花岗斑岩 云际 77.55 4.42 0.99 1.41 2.80 2.99 8.35 1.86 0.24 本文 XS-15-12 65.39 0.50 15.47 3.58 3.17 0.06 0.69 2.56 2.96 5.75 0.14 2.83 99.57 77.36 4.29 0.98 1.39 2.87 3.39 8.71 1.94 0.05 XS-15-13 67.25 0.48 15.07 3.45 2.85 0.06 0.66 2.44 2.89 5.51 0.13 2.06 99.68 78.49 4.31 0.99 1.40 2.84 2.93 8.40 1.91 0.22 X19 67.16 0.38 13.88 0.53 2.25 0.05 0.48 2.28 2.54 5.25 0.10 4.64 99.54 [12] 82.25 4.34 0.99 1.41 2.86 2.43 7.79 2.07 0.12 [12] T67-1 70.05 0.33 13.46 0.90 2.60 0.05 0.46 1.94 2.74 5.64 0.10 1.28 99.55 本文 84.57 3.73 0.95 1.27 3.39 2.57 8.38 2.06 0.00 本文 注：分异指数DI=Qz+Or+Ab+Ne+Lc+Kp；固结指数SI=MgO×100/(MgO+FeO+Fe2O3+Na2O+K2O)(Wt%)；ALK=K2O+Na2O(wt%)；A/NK=Al2O3/(K2O+Na2O)(mol比)；A/CNK=Al2O3/(K2O+Na2O+CaO)(mol比)；Rittmanσ=(K2O+Na2O)^2/(SiO2-43)(wt%)；AR=[Al2O3+CaO+(Na2O+K2O)]/[Al2O3+CaO-(Na2O+K2O)](wt%)；C：刚玉
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表 3 相山北部地区花岗斑岩微量元素分析结果
Table 3 Analyses of trace elements of granite porphyry in northern Xiangshan
10-6 样品号 岩性 产地 Li Be Sc V Cr Co Ni Ga Rb Sr Y Cs Ba Re Pb Th U Nb Ta Zr Hf 资料来源 岩性 产地 Rb/Sr Ba/Sr Rb/Nb Sr/Y Zr/Hf Rb/Ba 10000*Ga/Al Nb/Ta Ta/Hf Th/Hf 资料来源 XS-15-01 花岗斑岩 横涧 31.5 3.53 8.77 15.7 4.01 78.7 24.7 19.1 350 93.5 45.90 29.4 282 < 0.002 29.5 32.3 10.3 26.2 3.42 95.0 4.25 本文 花岗斑岩 横涧 3.74 3.02 13.36 2.04 22.35 1.24 2.55 7.66 0.80 7.60 本文 XS-15-03 33.0 3.67 8.36 39.6 8.04 76.8 24.3 22.0 229 235 43.90 9.08 675 < 0.002 33.9 24.9 5.70 26.1 2.06 70.9 2.90 0.97 2.87 8.77 5.35 24.45 0.34 2.67 12.67 0.71 8.59 XS-9 34.7 2.01 4.37 13.4 3.00 1.85 1.68 16.5 274 95.2 39.60 14.2 376 < 0.002 22.0 26.3 8.36 17.0 2.21 135 5.30 [13] 2.88 3.95 16.12 2.40 25.47 0.73 2.43 7.69 0.42 4.96 [13] XS-12 18.3 0.75 2.37 9.19 2.25 0.75 0.87 20.0 9.78 125 54.10 1.37 336 < 0.002 16.6 49.5 193 17.9 3.22 143 5.95 0.08 2.69 0.55 2.31 24.03 0.03 2.47 5.56 0.54 8.32 XS-18 47.8 2.65 2.85 8.74 2.77 0.52 0.53 19.9 127 43.8 45.70 14.6 39.4 < 0.002 4.97 24.8 13.3 18.1 3.17 134 5.86 2.90 0.90 7.02 0.96 22.87 3.22 2.40 5.71 0.54 4.23 XS-21 14.6 0.90 3.91 9.55 2.62 0.51 0.98 19.5 36.2 97.0 58.10 2.98 41.6 < 0.002 9.71 36.7 56.2 20.9 3.66 155 7.38 0.37 0.43 1.73 1.67 21.00 0.87 2.47 5.71 0.50 4.97 XS-22 41.4 3.88 4.89 20.2 4.52 1.81 1.42 17.5 298 110 47.00 14.2 230 < 0.002 15.8 30.6 8.05 19.8 2.80 147 6.16 2.71 2.09 15.05 2.34 23.86 1.30 2.51 7.07 0.45 4.97 XS-24 15.5 1.12 3.62 11.0 2.66 1.16 1.56 20.3 22.8 167 59.20 1.77 28.0 < 0.002 17.4 37.8 89.7 17.6 3.35 205 7.03 0.14 0.17 1.30 2.82 29.16 0.81 2.39 5.25 0.48 5.38 XS-25 23.2 1.05 2.18 9.88 2.63 0.58 0.52 21.2 41.1 164 68.70 6.67 187 < 0.002 34.1 63.7 146 15.5 3.45 168 6.74 0.25 1.14 2.65 2.39 24.93 0.22 2.86 4.49 0.51 9.45 XS-15-05 花岗斑岩 游坊 40.2 3.17 7.79 34.8 7.97 70.9 22.8 19.7 197 217 40.00 9.85 592 < 0.002 32.7 25.6 5.91 23.9 1.85 53.1 2.33 本文 花岗斑岩 游坊 0.91 2.73 8.24 5.43 22.79 0.33 2.43 12.92 0.79 10.99 本文 XS-15-06 28.0 3.65 8.33 35.9 7.30 70.9 23.0 21.1 120 189 37.10 9.69 386 < 0.002 19.6 24.8 10.1 23.9 2.02 61.8 2.76 0.63 2.04 5.02 5.09 22.39 0.31 2.57 11.83 0.73 8.99 XS-15-07 花岗斑岩 沙洲 48.1 3.24 10.2 47.9 10.0 82.6 23.9 22.7 200 288 49.00 14.4 861 < 0.002 40.4 25.7 4.85 28.7 2.19 73.0 3.03 本文 花岗斑岩 沙洲 0.69 2.99 6.97 5.88 24.09 0.23 2.76 13.11 0.72 8.48 本文 XS-15-08 53.5 4.07 8.93 37.2 7.54 81.3 22.9 22.0 242 204 61.10 11.8 589 < 0.002 30.7 30.2 9.84 34.0 2.88 74.0 3.33 1.19 2.89 7.12 3.34 22.22 0.41 2.69 11.81 0.86 9.07 XS-15-09 33.6 3.76 8.58 37.0 8.43 87.7 25.8 22.1 240 220 48.40 9.14 578 < 0.002 30.8 24.1 6.06 30.6 2.76 70.3 3.12 花岗斑岩 沙洲 1.09 2.63 7.84 4.55 22.53 0.42 2.78 11.09 0.88 7.72 本文 XS-15-10 43.4 3.81 8.19 33.1 7.74 102 29.4 21.9 245 199 47.40 7.56 550 < 0.002 38.0 24.8 6.34 28.7 2.73 85.6 3.68 1.23 2.76 8.54 4.20 23.26 0.45 2.84 10.51 0.74 6.74 D6576-1 24.6 2.50 5.67 21.5 2.50 2.60 3.89 14.7 135 59.2 25.40 6.03 373 < 0.002 11.1 24.0 3.21 4.49 0.85 215 8.30 2.28 6.30 30.07 2.33 25.90 0.36 2.07 5.28 0.10 2.89 D6575-1 36.1 4.08 5.70 16.3 5.62 2.68 3.96 15.4 173 114 40.00 7.78 398 < 0.002 25.0 29.0 4.53 10.2 1.02 197 10.3 1.52 3.49 16.96 2.85 19.13 0.43 2.21 10.00 0.10 2.82 T326-1 32.3 1.20 7.46 17.2 11.7 2.86 2.62 17.1 177 180 33.50 5.7 332 < 0.002 27.9 23.5 5.43 16.5 1.84 209 6.95 0.98 1.84 10.73 5.37 30.07 0.53 2.35 8.97 0.26 3.38 T326-2 38.4 2.66 7.06 16.3 8.08 3.59 4.37 16.5 188 188 30.40 5.47 484 < 0.002 26.6 26.9 5.05 15.9 1.38 223 7.24 1.00 2.57 11.82 6.18 30.80 0.39 2.18 11.52 0.19 3.72 T68-1 35.3 3.20 7.78 31.7 10.8 4.60 3.37 20.0 192 224 24.70 6.56 556 < 0.002 24.3 22.1 2.88 17.4 1.04 211 6.49 0.86 2.48 11.03 9.07 32.51 0.35 2.84 16.73 0.16 3.41 XS-15-11 花岗斑岩 云际 51.3 3.78 8.55 37.9 8.16 90.3 26.8 23.0 234 214 44.50 14.8 493 < 0.002 33.1 26.1 4.43 25.7 2.18 86.0 3.38 本文 花岗斑岩 云际 1.09 2.30 9.11 4.81 25.44 0.47 2.88 11.79 0.64 7.72 本文 XS-15-12 46.9 3.47 14.8 36.4 7.73 82.1 27.5 23.0 249 212 43.60 16.7 585 < 0.002 47.4 26.6 4.10 27.3 2.14 86.3 3.30 1.17 2.76 9.12 4.86 26.15 0.43 2.81 12.76 0.65 8.06 XS-15-13 39.9 3.47 13.1 35.8 7.51 85.2 25.7 21.4 236 209 40.90 11.6 492 < 0.002 33.1 24.6 4.06 23.8 1.91 73.2 2.84 [12] 1.13 2.35 9.92 5.11 25.77 0.48 2.68 12.46 0.67 8.66 [12] X19 35.2 2.85 7.78 27.1 6.92 3.44 2.36 17.9 181 179 23.60 6.92 513 < 0.002 30.5 18.5 2.21 15.3 1.04 100 3.16 1.01 2.87 11.83 7.58 31.65 0.35 2.44 14.71 0.33 5.85 T67-1 29.1 2.01 7.79 28.8 12.0 4.38 3.93 19.5 203 222 26.00 7.16 536 < 0.002 32.1 21.4 3.32 17.1 1.12 238 3.32 本文 0.91 2.41 11.87 8.54 71.69 0.38 2.74 15.27 0.34 6.45 本文
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表 5 相山北部地区花岗斑岩Sr、Nd同位素分析结果
Table 5 Sr, Nd isotope analytical results of granite porphyry in northern Xiangshan
样品号 年龄/Ma Rb/10-6 Sr/10-6 87Rb/86Sr 87Sr/86Sr(2σ) ISr Sm/10-6 Nd/10-6 147Sm/144Nd 143Nd/144Nd(2σ) INd εNd(t) fSm/Nd TDM2/Ma XS-15-01 135.6 350 93.5 0.1083 0.735104±15 0.735 10.6 54.5 0.1176 0.512166±5 0.512062 -7.83 -0.40 1567 XS-15-03 135.6 229 235 0.0282 0.71835±13 0.718 11.6 67.0 0.1047 0.512134±9 0.512041 -8.24 -0.47 1599 XS-15-05 136.2 197 217 0.0263 0.717494±13 0.717 10.1 59.5 0.1026 0.512162±16 0.512071 -7.64 -0.48 1552 XS-15-06 136.2 120 189 0.0184 0.717052±13 0.717 11.2 65.9 0.1027 0.512137±6 0.512045 -8.15 -0.48 1592 XS-15-07 133.4 200 288 0.0201 0.715875±10 0.716 13.3 77.9 0.1032 0.512172±8 0.512082 -7.50 -0.48 1537 XS-15-09 133.4 240 220 0.0316 0.717714±11 0.718 11.2 60.9 0.1112 0.512189±7 0.512092 -7.30 -0.43 1522 XS-15-11 134.3 234 214 0.0316 0.717051±16 0.717 11.5 69.9 0.0995 0.512152±8 0.512065 -7.81 -0.49 1564 XS-15-13 134.3 236 209 0.0327 0.718046±16 0.718 11.3 68.6 0.0996 0.512158±6 0.512071 -7.69 -0.49 1554 注：计算所需的参数：λ(Nd)=6.54×10-12a-1，λ(Sr)=1.39×10-11a-1，143Nd/144Nd与87Sr/86Sr所示的2σ误差取其小数点后的最后位数，TDM2年龄采用二阶段模式计算，计算公式为:TDM2=(1/λSm)ln(1+A)，A={(143Nd/144Nd)m-(143Nd/144Nd)DM-[(147Sm/144Nd)m-147Sm/144Nd)c](eλt-1)}/[(147Sm/144Nd)c-(147Sm/144Nd)DM]，式中，下角标DM代表亏损地幔值，下角标m代表样品现今测定值，下角标CHUR代表球粒陨石值，下角标c代表大陆壳平均值，(147Sm/144Nd)c=0.118；(147Sm/144Nd)CHUR=0.1960;(143Nd/144Nd)CHUR=0.512630[17]；(147Sm/144Nd)DM=0.2136；(143Nd/144Nd)DM=0.513151；样品计算年龄采用本文所测试的锆石U-Pb年龄值；初始钕INd=(143Nd/144Nd)i；初始锶ISr=(87Sr/86Sr)i
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表 6 相山北部地区花岗斑岩Pb同位素分析结果
Table 6 Pb isotope analytical results of granite porphyry in northern Xiangshan
样品号 年龄/Ma Th/ 10-6 U/ 10-6 Pb/ 10-6 208Pb/204Pb (2σ) 207Pb/204Pb (2σ) 206Pb/204Pb (2σ) (208Pb/204Pb)i (207Pb/204Pb)i (206Pb/204Pb)i 206Pb/207Pb Th/U XS-15-01 135.60 32.3 10.3 29.5 38.850±5 15.632±2 18.736±2 38.3615 15.6088 18.2600 1.19857 3.14 XS-15-03 135.60 24.9 5.70 33.9 38.884±4 15.629±2 18.489±2 38.5573 15.6179 18.2604 1.18300 4.37 XS-15-05 136.20 25.6 5.91 32.7 38.869±6 15.628±2 18.461±3 38.5194 15.6160 18.2144 1.18128 4.33 XS-15-06 136.20 24.8 10.1 19.6 39.044±5 15.645±2 18.832±2 38.4747 15.6104 18.1234 1.20371 2.46 XS-15-07 133.40 25.7 4.85 40.4 38.850±4 15.618±1 18.434±2 38.5720 15.6102 18.2737 1.18030 5.30 XS-15-09 133.40 24.1 6.06 30.8 38.870±4 15.631±1 18.516±2 38.5275 15.6182 18.2529 1.18457 3.98 XS-15-11 134.30 26.1 4.43 33.1 38.848±3 15.620±1 18.438±2 38.5011 15.6112 18.2581 1.18041 5.89 XS-15-13 134.30 24.6 4.06 33.1 38.921±3 15.639±1 18.485±1 38.5934 15.6309 18.3198 1.18198 6.06 注：(206Pb/204Pb)i=(206Pb/204Pb)实测-μ(eλt-1)；(207Pb/204Pb)i=(207Pb/204Pb)实测-μ/137.88(eλt-1)；(208Pb/204Pb)i=(208Pb/204Pb)实测-ω(eλt-1)；t为侵入岩结晶年龄或成矿年龄；计算所需的参数λ(232Th)=4.9475×10-11a-1；λ(235U)=9.8485×10-10a-1，λ(238U)=1.55125×10-10a-1；ω为现代测定的N(232Th)/N(204Pb)[18]；μ为现代测定的N(238U)/N(204Pb)
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表 7 相山北部各个地区花岗斑岩LA-ICP-MS锆石U-Th-Pb年龄
Table 7 LA-ICP-MS zircon U-Th-Pb dating results of the granite porphyry in northern Xiangshan
测点 Th/10－6 U/10－6 Th/U 207Pb/235U 207Pb/235U 206Pb/238U 206Pb/238U rho 206Pb/238U 比值 1σ 比值 1σ 年龄/Ma 1σ XS-3-1 123.10 255.72 0.481 0.1464 0.0140 0.02114 0.00053 0.260 134.84 3.32 XS-3-2 80.01 178.05 0.449 0.1433 0.0148 0.02155 0.00070 0.315 137.43 4.43 XS-3-3 118.77 232.25 0.511 0.1441 0.0103 0.02212 0.00056 0.355 141.07 3.52 XS-3-4 297.61 363.81 0.818 0.1466 0.0111 0.02159 0.00046 0.281 137.69 2.91 XS-3-5 148.59 386.14 0.385 0.1445 0.0096 0.02131 0.00045 0.322 135.90 2.87 XS-3-7 151.25 270.37 0.559 0.1445 0.0113 0.02131 0.00047 0.280 135.93 2.95 XS-3-8 213.25 473.19 0.451 0.1405 0.0101 0.02111 0.00041 0.267 134.66 2.56 XS-3-9 210.80 427.03 0.494 0.1428 0.0130 0.02115 0.00051 0.266 134.94 3.22 XS-3-10 156.28 419.68 0.372 0.1420 0.0098 0.02109 0.00042 0.288 134.57 2.64 XS-3-11 256.70 401.14 0.640 0.1422 0.0105 0.02136 0.00044 0.281 136.24 2.79 XS-3-13 154.13 342.37 0.450 0.1440 0.0123 0.02139 0.00055 0.303 136.45 3.49 XS-3-14 84.97 193.52 0.439 0.1448 0.0118 0.02128 0.00062 0.360 135.75 3.95 XS-3-15 141.28 405.71 0.348 0.1433 0.0106 0.02056 0.00039 0.255 131.22 2.46 XS-3-16 107.39 268.23 0.400 0.1451 0.0135 0.02136 0.00045 0.227 136.23 2.84 XS-3-17 145.36 280.12 0.519 0.1388 0.0112 0.02060 0.00049 0.295 131.43 3.11 XS-3-18 56.13 108.47 0.517 0.1460 0.0126 0.02188 0.00078 0.411 139.50 4.91 XS-3-21 127.07 235.04 0.541 0.1444 0.0125 0.02155 0.00057 0.307 137.44 3.63 XS-3-22 94.96 213.61 0.445 0.1429 0.0140 0.02154 0.00074 0.350 137.40 4.68 XS-3-23 90.96 206.12 0.441 0.1427 0.0128 0.02165 0.00067 0.346 138.06 4.24 XS-3-24 134.64 308.47 0.436 0.1431 0.0132 0.02154 0.00060 0.302 137.39 3.80 XS-3-25 150.93 302.21 0.499 0.1440 0.0122 0.02160 0.00050 0.273 137.79 3.15 XS-3-26 142.00 269.40 0.527 0.1428 0.0205 0.02128 0.00087 0.265 135.77 5.11 XS-3-27 84.52 178.32 0.474 0.1432 0.0143 0.02139 0.00063 0.296 136.46 4.00 XS-3-28 221.99 505.29 0.439 0.1451 0.0083 0.02106 0.00040 0.333 134.38 2.54 XS-3-29 193.25 502.51 0.385 0.1410 0.0098 0.02111 0.00042 0.289 134.68 2.67 XS-3-30 99.03 211.31 0.469 0.1404 0.0110 0.02103 0.00046 0.277 134.14 2.89 XS-5-1 143.42 301.45 0.476 0.1462 0.0124 0.02190 0.00056 0.302 139.68 3.54 XS-5-2 140.54 309.19 0.455 0.1378 0.0112 0.02065 0.00044 0.261 131.79 2.78 XS-5-3 146.05 267.92 0.545 0.1442 0.0111 0.02160 0.00045 0.271 137.78 2.85 XS-5-4 86.22 192.90 0.447 0.1419 0.0126 0.02126 0.00057 0.303 135.60 3.60 XS-5-6 180.31 484.05 0.373 0.1443 0.0104 0.02163 0.00044 0.282 137.97 2.78 XS-5-7 147.44 273.68 0.539 0.1435 0.0128 0.02127 0.00057 0.302 135.69 3.63 XS-5-8 108.67 205.27 0.529 0.1437 0.0146 0.02149 0.00060 0.277 137.04 3.81 XS-5-9 149.90 354.58 0.423 0.1425 0.0097 0.02118 0.00039 0.270 135.10 2.45 XS-5-11 88.35 198.46 0.445 0.1427 0.0158 0.02132 0.00060 0.254 136.01 3.79 XS-5-13 102.32 230.63 0.444 0.1439 0.0134 0.02182 0.00048 0.235 139.17 3.00 XS-5-14 164.28 431.25 0.381 0.1411 0.0111 0.02184 0.00049 0.283 139.26 3.07 XS-5-15 89.30 165.36 0.540 0.1448 0.0112 0.02163 0.00065 0.387 137.95 4.08 XS-5-16 82.92 176.18 0.471 0.1379 0.0220 0.02180 0.00089 0.256 139.04 5.61 XS-5-17 139.66 342.21 0.408 0.1465 0.0114 0.02053 0.00046 0.289 130.97 2.90 XS-5-21 143.44 333.93 0.430 0.1476 0.0101 0.02180 0.00042 0.284 138.99 2.68 XS-5-22 148.07 463.84 0.319 0.1412 0.0117 0.02067 0.00039 0.224 131.91 2.43 XS-5-23 96.50 235.99 0.409 0.1432 0.0116 0.02141 0.00049 0.285 136.58 3.11 XS-5-24 153.55 380.75 0.403 0.1527 0.0106 0.02222 0.00044 0.282 141.70 2.74 XS-5-25 134.39 276.66 0.486 0.1431 0.0156 0.02132 0.00059 0.253 135.98 3.71 XS-5-27 83.67 284.15 0.294 0.1505 0.0149 0.02219 0.00066 0.302 141.51 4.19 XS-5-30 271.67 554.47 0.490 0.1378 0.0091 0.02053 0.00037 0.271 131.03 2.33 XS-7-1 285.69 932.42 0.306 0.1366 0.0074 0.02048 0.00032 0.288 130.70 2.01 XS-7-2 153.15 377.42 0.406 0.1386 0.0115 0.02074 0.00041 0.239 132.34 2.59 XS-7-3 263.36 851.29 0.309 0.1409 0.0074 0.02078 0.00034 0.310 132.58 2.14 XS-7-4 213.00 583.76 0.365 0.1397 0.0084 0.02064 0.00036 0.291 131.68 2.28 XS-7-5 82.62 157.95 0.523 0.1375 0.0106 0.02059 0.00049 0.311 131.41 3.12 XS-7-6 186.72 446.76 0.418 0.1396 0.0095 0.02060 0.00041 0.293 131.43 2.59 XS-7-7 69.51 198.49 0.350 0.1387 0.0163 0.02050 0.00078 0.323 130.82 4.91 XS-7-8 87.07 186.04 0.468 0.1415 0.0137 0.02102 0.00054 0.263 134.11 3.38 XS-7-9 178.60 466.97 0.382 0.1372 0.0100 0.02068 0.00049 0.328 131.93 3.10 XS-7-11 199.10 482.15 0.413 0.1398 0.0123 0.02038 0.00044 0.244 130.07 2.77 XS-7-12 210.39 483.53 0.435 0.1406 0.0092 0.02072 0.00033 0.241 132.21 2.06 XS-7-14 77.52 179.27 0.432 0.1414 0.0147 0.02125 0.00056 0.253 135.57 3.54 XS-7-16 85.93 223.37 0.385 0.1390 0.0136 0.02126 0.00061 0.295 135.61 3.86 XS-7-17 220.58 601.58 0.367 0.1418 0.0121 0.02108 0.00049 0.272 134.47 3.07 XS-7-18 125.13 265.45 0.471 0.1430 0.0136 0.02146 0.00055 0.268 136.88 3.46 XS-7-19 271.56 736.99 0.368 0.1454 0.0089 0.02167 0.00039 0.291 138.19 2.44 XS-7-20 81.027 147.01 0.551 0.1422 0.0186 0.02141 0.00087 0.312 136.54 5.51 XS-7-24 170.75 450.48 0.379 0.1379 0.0089 0.02141 0.00046 0.331 136.55 2.88 XS-7-25 205.56 577.50 0.356 0.1400 0.0086 0.02100 0.00036 0.281 133.96 2.30 XS-7-26 175.87 400.94 0.439 0.1369 0.0119 0.02103 0.00046 0.253 134.16 2.91 XS-7-27 184.21 424.57 0.434 0.1401 0.0090 0.02147 0.00043 0.316 136.93 2.74 XS-7-28 71.34 185.04 0.386 0.1402 0.0158 0.02068 0.00075 0.323 131.94 4.74 XS-7-29 182.87 478.34 0.382 0.1404 0.0101 0.02088 0.00039 0.261 133.20 2.49 XS-7-30 143.20 334.18 0.429 0.1418 0.0105 0.02121 0.00047 0.300 135.29 2.98 XS-11-1 134.14 323.47 0.415 0.1389 0.0105 0.02078 0.00039 0.248 132.57 2.47 XS-11-2 75.92 145.46 0.522 0.1402 0.0159 0.02091 0.00057 0.239 133.43 3.58 XS-11-4 94.01 188.64 0.498 0.1431 0.0132 0.02090 0.00059 0.309 133.34 3.76 XS-11-5 104.18 196.60 0.530 0.1380 0.0119 0.02037 0.00049 0.280 130.01 3.11 XS-11-6 82.16 165.37 0.497 0.1430 0.0201 0.02151 0.00080 0.264 137.17 5.04 XS-11-7 154.14 445.99 0.346 0.1388 0.0101 0.02041 0.00044 0.298 130.26 2.79 XS-11-8 234.80 606.39 0.387 0.1403 0.0083 0.02090 0.00034 0.277 133.33 2.16 XS-11-9 174.29 574.29 0.303 0.1427 0.0087 0.02131 0.00035 0.267 135.92 2.20 XS-11-10 146.28 370.30 0.395 0.1382 0.0095 0.02025 0.00039 0.276 129.21 2.43 XS-11-11 90.50 197.85 0.457 0.1423 0.0105 0.02125 0.00047 0.299 135.55 2.95 XS-11-13 212.30 651.66 0.326 0.1408 0.0076 0.02076 0.00034 0.299 132.45 2.13 XS-11-14 126.67 272.35 0.465 0.1403 0.0108 0.02110 0.00060 0.370 134.64 3.81 XS-11-15 112.48 270.68 0.416 0.1406 0.0156 0.02137 0.00078 0.330 136.29 4.94 XS-11-16 158.51 454.75 0.349 0.1409 0.0100 0.02141 0.00043 0.286 136.56 2.73 XS-11-17 266.53 841.45 0.317 0.1398 0.0076 0.02178 0.00032 0.267 138.92 2.00 XS-11-18 181.03 447.45 0.405 0.1405 0.0090 0.02105 0.00042 0.310 134.28 2.65 XS-11-19 181.77 521.59 0.348 0.1425 0.0082 0.02125 0.00037 0.302 135.52 2.35 XS-11-20 172.74 380.97 0.453 0.1402 0.0088 0.02065 0.00042 0.320 131.75 2.64 XS-11-22 92.07 170.02 0.542 0.1448 0.0162 0.02162 0.00078 0.325 137.86 4.95 XS-11-23 164.24 319.39 0.514 0.1409 0.0159 0.02116 0.00079 0.332 134.99 5.00 XS-11-24 107.36 211.74 0.507 0.1450 0.0125 0.02160 0.00049 0.265 137.76 3.12 XS-11-25 172.35 291.38 0.592 0.1411 0.0132 0.02124 0.00051 0.259 135.48 3.25 XS-11-27 110.17 195.20 0.564 0.1396 0.0109 0.02151 0.00061 0.359 137.21 3.82 XS-11-29 143.64 494.07 0.291 0.1400 0.0082 0.02103 0.00036 0.293 134.14 2.27 XS-11-30 194.96 433.83 0.449 0.1408 0.0094 0.02120 0.00040 0.283 135.26 2.52
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