摘要
本文划分了渭北翘起带的镶嵌构造格局,分析了构造控水作用,揭示了渭北地下水的网状流及其“偏流效应”规律,指出了“贫水带”与“富水带”相互依存的辩证关系,为深入研究该区地下水开辟了一条新的途径。
The Weibei tilted zone,as the soutern margin of the Ordos biock,belongs to a second grade block in the Tai-hang stuctral belt,and locates at the south-western part of the former. It can be divided into two NE structural belts of the third grade in the NW direction. The latter can also be subdivided into two sub-belts. In the NE direction, four NW structural sub-belts can also be identified in the same way. The interweaving of the four sub-belts in the two directions (NE and NW) mentioned above, formed an oblique network of wavy mosaic structure of the weibei tilted zone. Sixteen tilted blocks can be recognized in this network. Each block has its own tectonic level and pattern,and it also has its own hydraulic characteristics.
Under the control of mosaic structure,the regional ground water flows along the netlike interwoven paths. The dominant structures of NE and ENE give rise to the formation of two different interstitial systems,that is, the NE wide interstitial and the NW narrow interstitial systems. Therfore,influenced by the effect of deviative current, the netlike flow of ground water is chiefly abundant in the NE structural system,forming the water-rich belts in which water flows in the NE direction. On the other hand, the bleeding of ground water often occurs along the NW structural system, forming water-poor belts. Hence,the netlike flow of ground water shows distinct hydraulic belts across the NW direction.
In addition, water-rich sub-belts may be found in the water-poor belts.The water-poor sub-belts may also exist in the water-rich belts. So,great attention should be drawn to such a rule of wavy distributive flow paths of ground water in searching for ground water resources.
基金
学院自然科学基金
