Shallow Structural Model of Anren Town Geological Map (1:50000) in Wei River Basin
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摘要: 地球浅表部是支撑和维持人类经济社会发展的关键区域,其不仅为人类提供赖以生存的资源需求,还是地质灾害如滑坡、崩塌、泥石流、地面沉降和地裂缝等发生的地质载体。笔者以渭河盆地安仁镇图幅(1:5万)为研究对象,运用野外地质调查、地球物理勘探和工程地质钻探等手段揭示了安仁镇图幅的地貌特征、地层岩性和断裂构造,在此基础上概括了该区的地质结构特征。主要取得以下认识:①双泉-临猗断裂和韩城-华阴断裂将研究区划分为3个地貌单元,即黄土台塬、渭河冲积阶地和黄河冲积平原。各地貌单元地层岩性均可按水文特性划分为隔水层和含水层。②渭河冲积阶地浅部发育4条隐伏正断裂,断裂的位错量随着深度的增加而显著增加,属于典型的生长断层;断裂控制了该区地貌和微地貌的演化过程及地裂缝的发育位置。③安仁镇的浅部地质结构具有以下特征:隔水层与含水层相间分布,隐伏断裂发育其中,浅地表破裂严重。本项研究可为分析该区地质灾害成因、评估地质环境承载力、合理开采地下水和保护生态环境等相关研究提供技术支撑。Abstract: The superficial part of the earth is a key area to maintain human economic development. It not only provides human resources for survival, but also is an engineering carrier of geological hazards, such as landslides, collapses, mudslides, land subsidence and ground fissures. This paper selects Anren town map (1∶50000) as research object and uses series of geological investigation,i.e., field geological survey, geophysical exploration and geological drilling to investigate the geomorphic features, stratum lithology and the fault structure of the geological structure in this area. the main conclusions are as follows: (1) the study areas can be divided into three geomorphic units of loess platform, alluvial terraces of Wei River and alluvial terraces of Yellow River by Shuangquan-Linyi fault and Hancheng-Huayin fault. The lithology of each geomorphic unit is either aquiclude or aquiclude according to hydrological characteristics. (2) Four normal buried faults developed in the shallow alluvial terrace of Wei River, the displacement increasing significantly with their depth and belonging to typical growth fault. Buried faults decide the process of geomorphology and micro-geomorphology and the developing positions of the ground fissures in this area. (3) The shallow geological structure of Anren town is characterized as interphase distribution of water-resisting layer and aquifer, development of buried faults and severe rupture of shallow surface. This paper gives technical support for analyzing the geological disasters, evaluating the carrying capacity of the geological environment, and rationally exploitation of groundwater and ecological environment protection as well.
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Key words:
- Wei River basin /
- Anren town /
- Geomorphic features /
- Stratum lithology /
- Geological structure
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