EPMA Study on Characteristics of Uranium Minerals in Uranium-bearing and Uranium-barren Granites in Northern Guangdong and Its Prospecting Significance
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摘要: 晶质铀矿的含量、形貌、成分、铀矿物类型、与铀矿物共存的矿物组合等特征可以作为产铀与不产铀岩体的判别标志,为花岗岩型铀矿找矿工作提供了一种新的技术手段。长江岩体和九峰岩体是粤北地区典型的产铀与不产铀花岗岩体,本文利用电子探针测试了九峰岩体的铀矿物并与长江岩体进行对比研究。结果表明九峰岩体的铀矿物主要为晶质铀矿,其化学年龄可分为两组,分别为~160 Ma、~105 Ma,与长江岩体的两组晶质铀矿年龄基本一致;其中第一组年龄代表岩体的成岩年龄,第二组年龄与粤北地区~105 Ma的基性岩脉侵入时代相对应;但九峰岩体缺少长江岩体中~74 Ma的成矿年龄。相比于长江岩体,九峰岩体的铀矿物受到后期热液事件的影响较小,铀没有发生明显的活化、转移,因而未能富集成矿,没有形成具有工业价值的铀矿床。Abstract: The content, morphology and composition of uraninite, types of uranium minerals, and mineral assemblages coexisting with uranium minerals can be used as the distinguishing marks of uranium-bearing and uranium-barren granites, which provides a new technique for prospecting granite-hosted deposits. Changjiang and Jiufeng granitic intrusions are typical uranium-bearing and uranium-barren granites in northern Guangdong. Uranium minerals from these two granitic intrusions were studied by Electron Microprobe. Results show that the main uranium mineral of Jiufeng granite is uraninite, and its age dated by Electron Microprobe can be divided into two groups, 160 Ma and 105 Ma, which are consistent with those of uraninite in Changjiang granite. The first group age represents the formation age, and the second group corresponds to the invasion age of mafic dikes at 103 Ma. But the age of 74 Ma was not found for Jiufeng granite. Compared with Changjiang granite, uranium minerals of Jiufeng granite are less affected by the late hydrothermal events and U is not activated and migrated, so that no economic uranium deposits occur in Jiufeng granite.
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Key words:
- uranium minerals /
- electron microprobe /
- distinguishing marks /
- Changjiang granite /
- Jiufeng granite
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表 1 九峰岩体铀矿物的电子探针分析结果及化学年龄
Table 1. EPMA data of the main elements in Jiufeng granite and their chemical ages
样品编号 含量(%) 含量(%) 年龄(Ma) UO2 ThO2 PbO SiO2 CaO FeO Y2O3 Ce2O3 Nd2O3 总量 U Th Pb JF-1-1-1 79.43 6.46 1.64 - 0.17 0.08 5.40 0.38 0.30 93.86 70.02 5.68 1.52 159 JF-1-1-2 79.22 4.21 1.04 0.08 0.16 0.38 5.23 0.42 0.29 91.03 69.83 3.70 0.97 103 JF-1-1-3 87.76 2.27 1.01 0.04 - 0.25 1.91 0.49 0.43 94.15 77.36 1.99 0.94 91 JF-1-1-4 81.07 5.48 1.37 - 0.14 0.11 4.84 0.41 0.30 93.72 71.46 4.82 1.27 131 JF-3B-1-1 81.18 7.05 1.73 - 0.12 0.02 4.23 0.56 0.50 95.37 71.56 6.20 1.60 164 JF-3B-1-2 81.37 4.99 1.20 0.03 0.14 - 4.39 0.43 0.30 92.85 71.73 4.39 1.11 115 JF-3B-1-3 81.60 4.88 1.19 0.03 0.08 - 3.92 0.47 0.37 92.55 71.93 4.29 1.11 114 JF-3B-1-4 84.00 4.37 1.09 - 0.08 0.02 3.88 0.35 0.38 94.18 74.05 3.84 1.01 101 JF-3B-1-5 80.65 7.31 1.71 0.07 0.19 0.03 3.74 0.35 0.22 94.28 71.10 6.43 1.58 163 JF-3B-1-6 82.50 4.82 1.19 - 0.06 0.05 4.13 0.26 0.23 93.24 72.73 4.23 1.11 113 JF-3B-1-7 83.83 5.52 1.01 - 0.09 0.01 3.94 0.32 0.37 95.08 73.89 4.85 0.93 93 JF-3B-1-8 80.75 5.89 1.32 0.04 0.17 - 4.25 0.37 0.26 93.04 71.18 5.18 1.23 127 JF-3B-1-9 81.58 4.70 1.13 - 0.12 0.01 4.26 0.35 0.28 92.43 71.92 4.13 1.05 108 JF-3B-1-10 83.89 7.82 1.78 0.02 0.09 0.04 3.88 0.29 0.18 97.98 73.95 6.87 1.65 163 JF-3B-1-11 81.71 4.84 1.11 - 0.09 0.04 3.70 0.37 0.50 92.35 72.02 4.25 1.03 106 JF-3B-1-12 80.68 5.09 1.23 - 0.12 0.01 4.13 0.41 0.44 92.12 71.12 4.47 1.15 119 JF-3B-1-13 81.02 4.66 1.09 - 0.09 - 3.82 0.44 0.40 91.54 71.42 4.10 1.02 105 JF-3B-1-14 81.39 7.11 1.73 - 0.14 - 4.09 0.47 0.54 95.47 71.75 6.25 1.60 164 JF-3B-1-15 82.30 4.67 1.13 - 0.03 0.08 3.58 0.30 0.35 92.44 72.55 4.10 1.05 107 JF-3B-1-16 81.18 7.05 1.73 - 0.12 0.02 4.23 0.56 0.50 95.37 71.56 6.20 1.60 164 JF-3B-1-17 81.37 4.99 1.20 0.03 0.14 - 4.39 0.43 0.30 92.85 71.73 4.39 1.11 115 JF-3B-1-18 80.95 4.73 1.17 - 0.09 0.02 4.31 0.63 0.45 92.34 71.35 4.16 1.08 112 JF-3B-1-19 81.25 4.29 1.03 0.01 0.09 0.04 3.60 0.28 0.31 90.89 71.62 3.77 0.96 99 JF-3B-1-20 81.48 4.28 1.06 - 0.18 0.02 3.53 0.47 0.41 91.42 71.82 3.76 0.98 101 JF-5-1-1 82.67 6.83 1.65 0.01 - 0.26 2.95 0.44 0.40 95.20 72.87 6.00 1.53 154 JF-5-1-2 86.12 4.75 1.18 0.25 0.01 0.50 2.98 0.60 0.52 96.92 75.92 4.18 1.09 107 JF-7B-1-1 79.82 6.63 1.60 0.01 0.07 0.15 5.75 0.25 0.19 94.45 70.36 5.83 1.49 155 JF-7B-1-2 79.42 3.66 1.08 - 0.02 0.12 6.67 0.34 0.24 91.55 70.01 3.22 1.01 107 JF-7B-1-3 80.62 3.83 1.20 0.05 - 0.13 7.44 0.21 0.20 93.67 71.07 3.36 1.11 116 JF-7B-2-1 80.18 4.88 1.09 - - 0.25 5.24 0.30 0.22 92.16 70.68 4.29 1.01 106 JF-7B-2-2 80.40 6.21 1.42 0.03 0.02 0.51 5.45 0.20 0.17 94.41 70.87 5.46 1.32 137 JF-7B-2-3 79.39 4.44 1.13 0.08 0.02 0.33 5.84 0.16 0.10 91.49 69.99 3.91 1.05 111 JF-8-1-1 91.88 4.57 1.93 0.07 - 0.16 1.24 0.14 0.10 100.09 80.99 4.02 1.79 164 JF-8-1-2 90.49 2.49 1.37 0.08 - 0.14 1.53 0.27 0.03 96.40 79.77 2.19 1.28 119 JF-8-1-3 91.13 3.05 1.93 0.48 0.06 0.13 1.59 0.26 0.10 98.73 80.33 2.68 1.79 166 JF-9-1-1 92.28 2.88 1.93 0.54 0.07 0.16 1.48 0.16 0.08 99.58 81.35 2.53 1.79 164 JF-9-1-2 91.36 3.22 1.34 0.09 - 0.24 1.54 0.26 0.17 98.20 80.53 2.83 1.24 114 JF-9-1-3 87.54 4.26 1.62 0.05 0.02 0.25 1.08 0.21 0.06 95.07 77.17 3.74 1.51 144 JF-9-1-4 92.15 4.37 1.81 0.19 0.25 0.34 1.17 0.18 0.08 100.53 81.94 3.84 1.68 152 JF-9-1-5 86.68 2.87 1.11 0.08 0.04 0.20 1.08 0.11 0.02 92.19 76.41 2.52 1.03 101 JF-9-2-1 92.28 1.91 1.49 0.07 - 0.10 1.21 0.22 0.07 97.36 81.34 1.68 1.38 127 JF-9-2-2 91.78 2.30 1.85 0.08 - 0.08 1.20 0.14 0.05 97.48 80.91 2.02 1.71 158 JF-9-2-3 92.47 1.57 1.26 - 0.01 0.07 1.26 0.24 0.07 96.94 81.51 1.38 1.17 107 JF-9-3-1 91.79 2.55 1.22 0.04 - 0.15 1.17 0.13 0.01 97.05 80.91 2.24 1.13 105 JF-9-3-2 93.24 2.61 1.45 0.02 - 0.13 1.25 0.16 0.13 98.98 82.19 2.29 1.34 122 JF-9-3-3 90.58 3.97 1.28 0.03 - 0.21 1.28 0.10 0.12 97.55 79.84 3.49 1.19 110 JF-9-3-4 87.44 3.56 1.67 0.14 - 0.19 1.90 0.38 0.26 95.53 77.08 3.13 1.55 149 JF-9-3-5 88.80 1.81 1.17 0.01 - 0.08 1.44 0.26 0.28 93.84 78.28 1.59 1.09 104 JF-9-3-6 88.53 3.56 1.24 0.10 - 0.17 1.43 0.14 0.08 95.24 78.04 3.13 1.15 109 JF-9-4-1 90.10 4.99 1.74 0.05 - 0.20 1.25 0.26 0.11 98.70 79.42 4.38 1.61 150 JF-9-4-2 85.93 3.56 1.17 0.62 0.12 0.14 1.26 0.15 0.09 93.02 75.74 3.13 1.09 107 JF-9-4-3 89.55 4.70 1.86 - - 0.07 1.48 0.35 0.18 98.19 78.94 4.13 1.73 162 JF-9-5-1 90.96 2.77 1.02 1.93 1.40 1.66 0.95 0.18 - 100.86 JF-9-5-2 80.99 2.20 0.77 3.63 1.74 2.26 0.77 0.07 - 92.44 JF-9-5-3 74.45 1.76 0.61 4.02 2.37 1.49 0.65 0.11 0.03 85.48 JF-9-6-1 73.70 1.42 0.84 12.20 0.29 1.66 1.02 0.05 0.01 91.19 JF-9-6-2 74.55 1.77 0.95 11.55 0.50 1.88 0.94 0.04 0.06 92.23 JF-9-6-3 85.08 1.34 0.89 7.64 1.31 1.14 0.99 0.22 0.07 98.67 
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