Geological Genesis of Alkaline Magnesium-Type Groundwater within the Ophiolitic Rocks Areas in Southwestern Turkey  

作　　者：Selma Demer 

机构地区：[1]Süleyman Demirel University,Engineering Faculty,Department of Geological Engineering,Isparta 32260,Turkey

出　　处：《Journal of Earth Science》2023年第4期1231-1248,共18页地球科学学刊（英文版）

摘　　要：The groundwaters within the ophiolite nappes in the southwestern part of Turkey have different physical and geochemical characteristics and are divided into five different groundwater facies.These are(1) Mg-HCO_(3),(2) Mg-HCO_(3)-CO_(3),(3) Mg-CO_(3)-HCO_(3),(4) Na-Ca-Cl-CO_(3),and(5) Ca-MgHCO_(3).The waters interact with ophiolites,mainly made up of basic-ultrabasic rocks,are characterized by alkaline and hyperalkaline character.Alkaline waters have high Mg,HCO_(3)contents and Mg/Ca ratio,and hyperalkaline water has high Na,Ca contents,and low Mg/Ca ratio.The waters in the study area formed by the interaction of meteoric waters with variously serpentinized ultramafic rocks under low-temperature conditions.Silicate weathering is the main hydrogeochemical process that plays a role in the chemical composition of water.Mg-HCO_(3)-type groundwaters are produced under open-system conditions with respect to CO_(2)due to meteoric water-serpentinized peridotite interactions in a shallow environment.Deep-seated groundwaters are Na-Ca-Cl-CO_(3)-type waters with high pH(TN-8 sample with p H 10.72),depleted in terms of Mg due to water-peridotite interaction under closed-system conditions with respect to CO_(2).Salda Lake with an alkaline character and high Mg and Na content is characterized by high evaporation and hydromagnesite deposition.

关 键 词：southwestern Turkey HYDROGEOCHEMISTRY alkaline water ophiolite water groundwater. 

分 类 号：P641.11[天文地球—地质矿产勘探]