广西北海市海城区西段含水层海水入侵地球化学过程研究

广西北海市海城区西段地下含水层出现过海水入侵.海水入侵过程中可能发生哪些地球化学作用是人们关注的问题.本文运用绘制Piper图、理论混合线(TML)、计算离子delta值和饱和指数SI以及水文地球化学模拟等方法研究了该区含水层在海水入侵后发生的地球化学作用.通常海水入侵后地下水含水层容易发生白云岩化作用,要通过模拟计算...

A study of geochemical processes for sea water intrusion in the western section of the Haicheng District of Beihai, Guangxi

Sea water intrusion once occurred in the western section of the Haicheng District in Beihai, Guangxi. Geochemical processes occurring during sea water intrusion is of concern. An attempt to identify the geochemical processes occurred in the intrusion of seawater in the coastal aquifer in the study area was made by using methods of ionic deltas, ionic ratios, saturation indices and hydrogeological simulation. In genera, dolomitization may easily happen after sea water intrusion, simulation must be done to make sure if it happen. The results by several methods suggest that in addition to a direct mixture of freshwater and seawater, dissolution of K-feldspar, dolomite and chlorite and deposition of calcite and illite were identified in the aquifer. In addition, cation exchange, dolomitization may also occur. Cation exchange took place between the clay and the groundwater and is quite clear as reverse exchange (removal of Na+ from solution).The dissolved quantity of dolomite is positive, this results suggest that dolomite dissolution and dolomitization impossibly happen in this zone.