宜昌磷矿矿床地下水赋存条件的影响因素浅析

Preliminary Analysis on Influencing Factors of Underground Water Occurrence Condition in Yichang Phosphorus Deposit

在总结宜昌磷矿区以往水文地质工作成果的基础上,对区内影响矿床地下水赋存条件的主要因素进行了系统分析,认为区内构造断裂较为发育,其中以晚期构造断裂、裂隙沟通性较强,对地下水的富集和运移起着明显的控制作用;风化、岩溶作用扩大了地下水导水、溶水空间;在水平方向上,地下水与地表水交替频繁,地下水导水、富水性较强;在垂直方向上,岩溶作用主要在灯影组、陡山沱组Z2d13层中普遍发育,对矿床充水有重要影响。为今后进一步搞好区内磷矿勘探工作,查明矿床的充水特征具有重要的指导意义。

Based on summary of the past hydrological geological results of Yichang phosphorus deposit area, the main factors influencing the underground water occurrence condition are analyzed. The author＇s views show as follows： in study area, tectonic fracture developed well, with late tectonic fracture predominate, the strong communication of fracture control the concentration and migration of underground water obviously; weathering and karst processes expand the water conductivity and absorption space; in horizontal direction, underground water alternates with surface water frequently, the water conductivity and concentration of underground water act strongly; in vertical direction, karstification developed widely in Dengying Formation and Z2d1^3 layer of Doushantuo Formation, which plays an important role in water-filling of deposit. It is of great guiding significance in further doing the phosphorus exploration well in the region and verifying the water-filling characteristics of deposit.