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天草凹陷中次凹具有规模大、构造复杂、物源充足和沉降深等特征，铀成矿条件相对较好。经初步钻探查证，在下白垩统苏红图组中发现了较高品位的铀矿化，但本区铀矿地质勘查和科研程度低，找矿潜力不明。开展铀成矿条件分析与远景预测，有利于指明天草凹陷的找矿方向，促进银额盆地铀矿勘查取得新地区、新层位突破。从基础资料分析入手，通过地震解译和平衡剖面反演，查明了天草中次凹的结构、构造特征，恢复了次凹的构造发育史，在此基础上深入分析了次凹的铀成矿构造条件。研究表明天草中次凹为不对称地堑结构，次凹的结构、构造控制了有利相带的发育和砂体的展布，断裂体系控制了成矿流体活动，反转隆升与区域不整合控制了后生改造。次凹北西坡发育缓倾断阶构造，断裂系统发育，沉积相带和砂体规模较大，总体成矿条件较有利，优选出Ⅱ级远景区1片。
Abstract：The central sag in the Tiancao depression bears the characteristics of large scale, complex structure, ample sediment supply, and deep subsidence, forms relatively favorable conditions for uranium mineralization. Preliminary drilling verification has identified relatively high-grade uranium mineralization within the Lower Cretaceous Suhongtu formation. However, due to the low level of uranium geological exploration and scientific research, and the uranium prospecting potential is yet unclear to be clearly.Therefore,conducting an analysis of uranium metallogenic conditions and prospectivity prediction is essential for delineating uranium exploration targets within the Tiancao depression and facilitate the breakthroughs in discovering new areas and new stratigraphic horizons for uranium exploration in the Yingen-Ejin basin.Commencing with an analysis of fundamental geological data and utilizing seismic interpretation and balanced cross-section restoration techniques, this study elucidated the structural architecture and tectonic characteristics of the central sag, reconstructed its structural evolution history. Based on this foundation, a detailed analysis of the structural controls on uranium mineralization within the sag was conducted. Research indicated that the middle sag had an asymmetric graben structure. The structure and tectonics of the sag controlled the development of favorable facies zones and the distribution of sand bodies. The fault system controlled the activities of ore-forming fluids. The uplift inversion and regional unconformity control the epigenetic transformation. A gently dipping fault terrace structure has developed on the northwestern slope of the sag. The fault system is well-developed,the sedimentary facies belts and sand bodies are characterized by significant scale, creating overall advantageous conditions for mineralization. Consequently, one Class Ⅱ prospective area has been prioritized.
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基本信息:
DOI：
中图分类号:P619.14
引用信息:
[1]贾立城 ,刘武生 ,李真真 ,等.银额盆地天草凹陷中次凹断陷层构造特征与找矿方向分析[J].世界核地质科学,2025,42(05):916-928.
基金信息:
核技术研发项目（编号：地H2401）资助~~