武山矿区地质构造控制下岩溶发育规律

Karst development regularity controlled by geological structure in Wushan mineral area

本文通过对武山地区地质构造演化过程的分析,重塑矿区岩溶发育史,进而推断深部岩溶发育程度,探讨了矿区外围岩溶发育规律,为预测深部矿坑涌水量、安全开采铜矿提供依据。研究表明:武山矿区的岩溶建造期从晚古生代开始,深部岩溶主要是在燕山期形成;北部岩溶发育受到硫化矿体和纵向断裂的影响;矿区外围岩溶总体发育程度不高的关键因素是区域构造背景控制了原始地下水动力场,限制了岩溶发育的深度;三叠系灰岩及第四系透水性能决定了目前赤湖水无法对深部开采造成严重威胁。

This paper tries to reappear history of karst development in Wushan mineral area, predicts deep karst development degree and then understands karst development regularity outside the mineral area based on the analysis of geological-structural evolutionary process. Results show that karst formation in Wushan mineral area starts from later Paleozoic, deep karst is mainly formed in Yanshan phase; northern karst development is influenced by sulfide minerals and longitudinal fault. Key factor to poor karst development in mineral is that regional tectonic setting controls original hydrodynamic field and retrains the depth of karstification. The water permeability of Triassic limestone and Quaternary determines small threatening of surface water to deep mining.