| 陇东盆地西部岩溶地下水形成机制研究 |
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| 引用本文： | 张彦林,李生永,付东林,崔旭东.陇东盆地西部岩溶地下水形成机制研究[J].中国地质,2006,33(6):1393-1399. |
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| 作者姓名： | 张彦林 李生永 付东林 崔旭东 |
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| 作者单位： | 甘肃省地质调查院,甘肃,兰州,730000 |
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| 基金项目： | 中国地质调查局地质调查项目 |
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| 摘 要： | 陇东盆地西部处于鄂尔多斯盆地西缘逆冲推覆构造带，新元古-下古生界碳酸盐岩裸露或浅埋，构成-南北向展布的岩溶水富集带。通过运用构造控水分析、水化学同位素等方法，对岩溶裂隙水系统进行了深入的分析与讨论。指出本区岩溶水的空间分布明显受南北向逆冲推覆构造控制，储水空间以岩溶裂隙为主，构造条件是岩溶发育和岩溶水富集的主要制约因素。岩溶水化学特征具有明显的南北差异，在补给条件优越的中南部平凉-华亭地区，水化学主要由含水层岩性及其赋存条件决定。岩溶地下水以大气降水来源为主，对于埋藏型岩溶水表现为多源水混合而成。根据岩溶水的空间分布与水动力场特征及其补径排条件，全区可划分为平凉、华亭和环西3个相对独立的岩溶水系统．并以此可作为水资源评价的基础。这些认识对于深入了解西北干旱-半干旱地区岩溶水赋存及富集规律、形成与演化机理和在该区开发利用岩溶地下水资源具有重要的科学意义。
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| 关 键 词： | 陇东盆地西部 岩溶含水介质 构造控水 岩溶水系统 |
| 文章编号： | 1000-3657（2006）06-1393-07 |
| 收稿时间： | 2006-02-28 |
| 修稿时间： | 2006-02-282006-08-21 |
Formation mechanism of karst groundwater in the western Longdong basin, northwestern China |
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| ZHANG Yan-lin,LI Sheng-yong,FU Dong-lin,CHUI Xu-dong.Formation mechanism of karst groundwater in the western Longdong basin, northwestern China[J].Chinese Geology,2006,33(6):1393-1399. |
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| Authors: | ZHANG Yan-lin LI Sheng-yong FU Dong-lin CHUI Xu-dong |
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| Institution: | Gansu Institute of Geological Survey, Lanzhou 730000, Gansu, China |
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| Abstract: | The western Longdong basin is situated in an overthrust belt on the western edge of the Ordos basin, where Neoproterozoic-Lower Paleozoic carbonate rocks are exposed or buried at shallow depths, forming a N- S-trending karst water concentration zone. The karst-fissure water system is analyzed and discussed using the method of structural control on water and hydrochemical isotope analysis. The spatial intensively by distribution of karst water in the area is controlled obviously by a N-S-trending overthrust belt, the water-storing space is mainly karst fissures and the karst development and karst water concentration are mainly controlled by structure. The hydrochemical features of karst groundwater in the south are notably different from those in the north. The hydrochemistry in the Pingliang-Huating area in the south-central part with superior recharge conditions of groundwater is mainly determined by the aquifer lithology and its occurrence conditions. Karst groundwater mainly originates from meteoric water, while the buried karst groundwater is mixed water from multiple sources. Based on the spatial distribution, features of the hydrodynamic field and recharge, runoff and draining conditions of karst groundwater, the whole karst area is divided into three relatively independent karst groundwater systems, namely, the Pingliang, Huating and west Huanxian systems, which may serve as a basis for water resource evaluation in the karst area. These views have great scientific significance for a better understanding of the characteristics of occurrence and concentration and mechanism for formation and evolution of karst water in arid and semiarid areas of northwestern China and exploitation and utilization of karst water resources in the study area. |
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| Keywords: | western Longdong basin karst groundwater media structural control on water karst groundwater system |
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