相山矿田晚新生代应力致裂构造及其对铀矿扩大找矿的指示
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中国核工业地质局地勘费项目“江西省相山矿田及邻区铀矿资源调查评价与勘查”(2022-29)


orefield and its indication for uranium ore prospecting
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  • 核工业二七0研究所, 中国地质学会华东放射性矿产勘查技术创新基地,南昌,330200    
  • No. 270 Research Institute of Nuclear Industry, Nanchang,Innovation Base for Radionetric Mineral Exploration Technology of East China Geological Society of China, 330200    
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    摘要:

    华南江西相山矿田是热液型铀矿的代表性矿田,破裂构造发育,按作用力来源的不同,划分为应力致裂构造和流体致裂构造(水力压裂构造),流体致裂构造是矿田的主要成矿构造,笔者近年做了较多探讨,而对应力致裂构造的梳理归纳则相对薄弱,认识有待深化,对铀矿床的定位、勘查找矿意义也没有引起足够的重视。通过地质地貌调查、构造专题调查、AMT测量(大地电磁测深测量)资料分析,对应力致裂构造进行了一次梳理分析,结果表明,应力致裂构造主要表现形式是NE向、NW向和SN向断层,它们多沿沟谷分布,断层岩松散未完成完全胶结,AMT测量表现为低阻异常带,温热水与之关系密切,属晚新生代构造活动的产物。应力致裂构造控制了相山现代地貌构造格局,尤其是NE向断层,影响尤为深刻,致使似层状产出的相山火山侵入杂岩由南东向北西呈阶梯式下陷,并隐伏于西部晚白垩世红层深部,构成红层直接基底的组成部分,指示着红层深部的良好找矿远景。

    Abstract:

    Xiangshan uranium orefield in South China is a representative orefield of hydrothermal uranium deposit. The fracture structures are developed, which can be divided into stress-induced fracture structures and fluid-induced fracture structures (hydraulic fracture structures) according to the different sources of force. Fluid-induced fracture structures is the metallogenic structure of Xiangshan uranium orefield.In recent years, the author has made more discussions on the metallogenic structure of Xiangshan uranium orefield, but the combing and induction of the stress-induced fracture structure is relatively weak, the understanding needs to be deepened, and the significance of the location and prospecting of uranium deposits has not attracted enough attention.Through geological and geomorphological surveys, structural special surveys and AMT survey data analysis, a combing analysis of stress-induced fracture was conducted.The results showed that the main manifestations of stress-induced fracture structures were NE-direction, NW-direction and SN-direction faults, which were mostly distributed along the valley, and the tectonic rocks were loose and not completely cemented.The AMT surveys show a low-resistivity anomalous zone, closely related to warm and hot water, and is a product of late Cenozoic tectonic activity.The stress-induced fracture structures control the modern geomorphological structure pattern of Xiangshan, especially the NE-direction faults, which have a particularly profound influence, resulting in the stratiform-like volcanic intrusive complex of Xiangshan from southeast to northwest in a stepped subsidence, and buried in the deep part of the late Cretaceous red bed in the west, forming a component of the direct base of the red bed, indicating a good prospect for prospecting in the deep part of the red bed.

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张万良.2025.相山矿田晚新生代应力致裂构造及其对铀矿扩大找矿的指示[J].地质论评,71(1):2025020013,[DOI].
ZHANG Wanliang.2025. orefield and its indication for uranium ore prospecting[J]. Geological Review,71(1):2025020013.

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  • 在线发布日期: 2025-02-20