古堆泉岩溶地下水系统特征及系统圈划

古堆泉是汾河流域内唯一的中低温地热泉，研究其水文地质特征、划定岩溶地下水系统边界是进行岩溶地下水资源评价和地热水成因研究的基础。通过对古堆泉岩溶地下水系统的地质结构特征、水文地质结构特征和岩溶地下水循环演化规律分析，初步圈划了古堆泉岩溶地下水系统及其子系统。研究结果表明：系统内地质结构复杂、火成岩侵入和隐伏断裂发育，总体上可以将其概括为南北和东西向均"三隆三陷"的地质格局；古堆泉岩溶地下水主要接受塔儿山、二峰山及中条山碳酸盐岩裸露区的降水入渗补给，南梁泉和海头泉是系统内2个岩溶地下水的局部排泄点，古堆泉是最终排泄点。根据水文地质结构特征和岩溶地下水循环特征确定了古堆泉岩溶地下水系统边界及其水文地质性质，圈定的古堆泉岩溶地下水系统面积为2 942 km²，并进一步将其划分为4个相对独立的岩溶地下水子系统：塔儿山-九原山古堆泉岩溶水子系统、佛岭山-高显海头泉岩溶水子系统、中条山南梁泉岩溶水子系统、侯马盆地深循环岩溶水子系统。

Hydro-Geological Characteristics and Demarcation of Gudui Spring Karst Groundwater System

Gudui Spring is the only low medium temperature geothermal spring in Fenhe River basin. The research of hydro-geological characteristics and demarcation of karst groundwater system is the basis of karst groundwater resource evaluation. On the basis of the geological structural and hydro-geological characteristic analysis and karst groundwater circulation, the Gudui Spring karst groundwater system and subsystem are preliminarily delimited. The results show that the geological structures of the Gudui Spring karst system are complicated, and there are a lot of intrusive igneous rocks and buried faults. The overall geological structure of the system can be described as three uplifts and three subsides both in east-west and north-south directions. The recharge of karst groundwater is mainly from the precipitation of carbonate outcrop areas in Taer Mountain, Erfeng Mountain and Zhongtiao Mountain. Nanliang Spring and Haitou Spring are two local discharge areas;while Gudui Spring is the final discharge area. The boundary of Gudui Spring karst groundwater system and its hydrogeological nature are delimited by using the method of hydro-geological and groundwater circulation characteristic analysis. The area of Gudui Spring karst system is 2 942 km² and can be divided into four relatively independent systems. The first is Taer Mountain-Jiuyuan Mountain Gudui Spring karst subsystem, the second is Foling Mountain-Gaoxian Haitou Spring karst subsystem, the third is Zhongtiao Mountain Nanliang Spring karst subsystem,and the last is Houma Basin deep circulation karst groundwater subsystem.