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周正龙,男,1992年生,工程师,主要从事铀矿地质调查工作。E-mail:531789195@qq.com |
收稿日期: 2024-12-20
修回日期: 2025-01-21
网络出版日期: 2025-11-07
基金资助
中国核工业地质局项目(202110)
中国核工业地质局项目(202331-2)
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)
坪溪岩体位于桃山-诸广铀成矿带北段,前人在岩体内发现了一批铀矿化点,基于坪溪岩体地质调查、物化探测量和分析测试数据,系统阐述了该岩体的铀矿化特征,分析了铀成矿条件与控矿因素。研究认为:坪溪岩体为多期次S型复式产铀花岗岩体,岩浆-构造热液活动强烈,铀成矿地质条件十分有利,铀矿化主要受NNE-NE向断裂构造控制,定位于多组断裂交汇部位,铀矿体产于次级断裂裂隙中,常伴有多期次热液蚀变作用,赤铁矿化、硅化是主要的找矿标志。其中双坑-付竹地段燕山早期-晚期岩浆热液活动强烈,NE向山坑-坪溪、NWW向庐元-合溪-付竹控、含矿断裂发育,深部延伸稳定,硅化、赤铁矿化和黄铁矿化等近矿热液蚀变强烈,浅深部铀异常发育,深部及外围具有较大的找矿潜力,是下一步的重点找矿方向。
周正龙 . 赣中坪溪岩体铀成矿条件及找矿方向浅析[J]. 世界核地质科学, 2025 , 42(1) : 86 -95 . DOI: 10.3969/j.issn.1672-0636.2025.01.007
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.
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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