Analysis on the uranium mineralization conditions and prospecting direction of Pingxi pluton in central Jiangxi
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ZHOU Zhenglong,male,born in 1992,engineer,mainly focusing on uranium geological exploration. E-mail:531789195@qq.com |
Received date: 2024-12-20
Revised date: 2025-01-21
Online published: 2025-11-07
Supported by
China Nuclear Geology(202110)
China Nuclear Geology(202331-2)
Pingxi pluton is located in the northern section of the Taoshan-Zhuguang uranium mineralization belt,and a number of uranium mineralization occurrences have been found in the pluton by previous researchers,However,the systematical study were conducted on the uranium metallogenic conditions such as lithology,structure and alteration in the area,and the overall evaluation of uranium resource potential was not completed and no specific suggestions or opinions been put forward in the main mineralization control factors for the uranium exploration. In order to find the direction of next exploration,this paper systematically discussed the uranium mineralization characteristics of the pluton by geological investigation,physical survey and chemical analysis,analyzes the conditions of uranium mineralization and ore-controlling factors. The study concluded that the Pingxi pluton is a multi-stage S-type uranium-producing granite,with strong magmatic-tectonic hydrothermal activity,uranium mineralization is mainly controlled by the NNE-NE oriented fracture,and located at the intersection of different striking of fractures,the ore body is set in the fissures of the secondary fracture,which is often accompanied by multi-phase hydrothermal alteration,the hematitization and silicification is the main prospecting sign. The predicted favorite mineralization sectors are Shuangkeng-Fuzhu section where strong magmatic hydrothermal activity occurred in the early to late Yanshan period,with northeast trending Shankeng-Pingxi and northwest trending Luyuan-Hexi-Fuzhu ore controlling faults which extend stably into the deep with strong hydrothermal alteration such as silicification,hematitiztion and pyritization,and geophysical and geochemical anomalies are developed in the shallow and deep. Therefore there is great metallogenic potential in the deep and peripheral areas.
Zhenglong ZHOU . Analysis on the uranium mineralization conditions and prospecting direction of Pingxi pluton in central Jiangxi[J]. World Nuclear Geoscience, 2025 , 42(1) : 86 -95 . DOI: 10.3969/j.issn.1672-0636.2025.01.007
图3 坪溪复式岩体各期次侵入体相关照片a-横坝岩体岩性;b-横坝岩体镜下照片;c-合溪岩体岩性;d-横坝岩体镜下照片;e-大通岩体岩性;f-大通岩体镜下照片;g-老茶汗岩枝岩性;h-老茶汗岩枝镜下照片。 Fig. 3 Photos of intrusions in various stages of the Pingxi granitic complex a-Rock type of Hengba rock mass;b-Microscopic photo of Hengba rock mass;c-lithology of Hexi rock mass;d-Microscopic photo of Hengba rock mass;e-lithology of Datong rock mass;f-photo of Datong rock mass under the microscope;g-Rock type of Laochahan rock branch;h-Photo of the old tea sweat rock branch under a microscope. |
表1 坪溪地区铀矿化特征表Table 1 Characteristics of uranium mineralization in Pingxi area |
| 矿(化)点 | 矿化类型 | 赋矿部位 | 含矿岩性 | 主要控矿因素 | |
|---|---|---|---|---|---|
| 矿点 | 付竹 | 硅化破碎带亚型 | 合溪岩体东部 | 粗粒斑状黑云母花岗岩 | NE向F12和NW向FW5断裂 |
| 上庄 | 硅化破碎带亚型 | 大通岩体西部 | 中细粒斑状黑云母花岗岩 | NE向F8和NW向FW6断裂 | |
| 处长湾 | 硅化破碎带亚型 | 大通岩体中部 | 中细粒斑状黑云母花岗岩 | NE向F9和NW向FW6断裂 | |
| 大通 | 硅化破碎带亚型 | 大通岩体中部 | 中细粒斑状黑云母花岗岩 | NE向F9和NE向F6断裂 | |
| 下东坑 | 硅化破碎带亚型 | 合溪岩体东部 | 粗粒斑状黑云母花岗岩 | NE向F9断裂 | |
| 矿化点 | 双坑 | 硅化破碎带亚型 | 合溪岩体东北部 | 细粒黑云母花岗岩 | NE向F10和NW向FW4断裂 |
| 山坑 | 硅化破碎带亚型 | 合溪岩体北部 | 粗粒斑状黑云母花岗岩 | NE向F9和NW向FW2断裂 | |
| 庐元 | 硅化破碎带亚型 | 合溪岩体东部 | 粗粒斑状黑云母花岗岩 | NE向F10和NW向FW5断裂 | |
| 下浪 | 硅化破碎带亚型 | 合溪岩体西北部 | 粗中粒斑状黑云母花岗岩 | NE向F3断裂 | |
表2 坪溪复式花岗岩体岩浆活动期次表Table 2 Magmatic activity period table of Pingxi complex granite |
| 岩浆活动期次 | 代号 | 岩体/出露面积/km2 | 时代/Ma | 确定方法 | 铀含量 | ||
|---|---|---|---|---|---|---|---|
| 燕山期 | 晚期 | γ53 | 老茶汗岩枝 | 144.7±2.3 | 锆石U-Pb LA-ICP-MS | 18.3 | |
| 早期 | 第2阶段 | γ52-2 | 大通岩体 | 154.7±1.4 | 14.8 | ||
| 第1阶段 | γ52-1 | 合溪岩体 | 156.3±1.3 | 11.5 | |||
| 加里东期 | γ3 | 横坝岩体 | 452.9±3.1 | 8.4 | |||
表3 坪溪复式花岗岩体主量元素分析结果表/%Table 3 Main elements analysis results of Pingxi complex granite /% |
| 岩体 | SiO2 | Al2O3 | Fe2O3 | FeO | CaO | MgO | K2O | Na2O | TiO2 | P2O5 | MnO | LOI |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 横坝 | 72.62 | 14.41 | 0.47 | 1.34 | 2.00 | 0.58 | 3.50 | 3.32 | 0.28 | 0.13 | 0.039 | 1.17 |
| 72.15 | 14.59 | 0.53 | 1.26 | 1.90 | 0.55 | 3.82 | 2.96 | 0.28 | 0.13 | 0.048 | 1.62 | |
| 合溪 | 75.93 | 13.09 | 0.23 | 0.82 | 0.47 | 0.099 | 4.66 | 3.23 | 0.086 | 0.089 | 0.067 | 1.14 |
| 73.63 | 14.23 | 0.79 | 0.71 | 0.20 | 0.19 | 5.15 | 3.44 | 0.14 | 0.037 | 0.061 | 1.34 | |
| 75.72 | 12.35 | 0.42 | 1.74 | 0.78 | 0.30 | 4.34 | 2.95 | 0.20 | 0.054 | 0.078 | 0.88 | |
| 75.77 | 13.08 | 0.32 | 0.68 | 0.60 | 0.12 | 4.62 | 3.34 | 0.092 | 0.088 | 0.060 | 1.16 | |
| 大通 | 74.63 | 13.48 | 0.40 | 1.08 | 0.91 | 0.27 | 4.46 | 3.22 | 0.21 | 0.12 | 0.065 | 1.03 |
| 73.86 | 13.85 | 0.34 | 1.24 | 0.74 | 0.22 | 5.36 | 2.95 | 0.19 | 0.14 | 0.044 | 0.93 | |
| 老茶汗岩枝 | 73.69 | 13.78 | 1.05 | 0.78 | 0.46 | 0.22 | 5.33 | 2.92 | 0.22 | 0.11 | 0.064 | 1.27 |
| 75.69 | 13.97 | 0.17 | 0.61 | 0.22 | 0.059 | 4.30 | 3.64 | 0.039 | 0.14 | 0.11 | 0.98 |
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