论文摘要
Hydrogeological features are closely related to the Quaternary neotectonic movement and sedimentation in the Hetao area of Inner Mongolia. The study of neotectonic movement and sedimentary facies is the basis for understanding the controlling factors and mechanisms of hydrogeological processes. During the Quaternary geological mapping, hydrochemical sampling and tests were carried out on different water bodies consisting of groundwater, lakeand river, along the Serteng Mountain to Taerhu town and the Yellow River. The responses of hydrogeological characteristics to the Quaternary neotectonic movement and sedimentation process are discussed, including flowand hydrochemical features typically characterized by high arsenic（As） groundwater. Results are as follows:（1）The piedmont fault activity controlled the sedimentation of the river in the basin, which in turn affectedthe groundwater flow. Hydrochemical tests reveal that the primary types of spring water in the piedmont, the groundwater in the basin, and the Yellow River are HCO3-Ca, HCO3-Na and Cl-Na, and HCO3-Na respectively. Although the lake bodyexists difference, its cations and anionsare dominated by Na+ and Cl-, indicating that there is a hydraulic relationship between lake and groundwater, that is, HCO3-Na type groundwater transforms into a higher salinity of Cl-Na type lake by evaporation and concentration. The groundwater total dissolved solids（TDS）have a tendency to be larger from the piedmontarea to Taerhu town, whichare 567 mg/L, 957 mg/L, and 2296 mg/L. The anion basically conforms to the variation pattern of HCO3--SO42--Cl-, suggesting that groundwater flows from the northern mountain area to Taerhu town.While the TDS valuesof lakes in the Taerhu area do not rise with the increase of groundwater TDS, but less than that of the correspondinggroundwater, indicating that the Taerhulakes have accepted different sources of supply, and the maximum TDS value（ 1213 mg/L） is the concentratedgroundwater discharge area. Since the Holocene（Qh）, the three-periodpalaeo-channels have been buried deeper and older in the north in the study area, illustrating that the inherited activities of the northern piedmont fault led to the migration of the Yellow River from north to south. Sedimentary facies analysis shows that the remaining sand layers of the riverbed subfacies are connected to form the main aquifer of shallow groundwater in the Hetao basin. The aquifer inclines to the north, providing the channel and necessary hydraulic gradient conditions for the southern Yellow River to move to the north andrecharge groundwater. In addition, there existedthe preQuaternary paleo-uplift in the deep part of Fuxing town, and there was a buried normal fault inclined to the north, which made the Taerhu areabecomefault depression, and the convergent discharge area of the southern river and the northern piedmont groundwater.（2） The piedmont fault activity and sedimentation control the formation of high
论文目录
文章来源
类型: 国际会议
作者: ZHANG Haoyue,ZHANG Xujiao,LI Chenglu,ZHOU Qingshuo,YE Peisheng
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学
专业: 地质学,地质学,地质学
单位: China University of Geosciences(Beijing)Institute of geomechanics, Chinese Academy of Geological Sciences
分类号: P641;P542;P512.2
DOI: 10.26914/c.cnkihy.2019.028493
页码: 384-385
总页数: 2
文件大小: 176k
下载量: 1