Geochemical and Hydrogeochemical Processes Determining Arsenic Presence in Rocks and Groundwater in the Southeastern Portion of El Bajío Guanajuatense,Guanajuato,Mexico  

作　　者：JoséIvan Morales-Arredondo María A.Armienta Hernández Eduardo A.Lugo-Dorantes Fátima Juárez-Aparicio Francisco Romero Zaknite I.Flores-Ocampo 

机构地区：[1]Instituto de Geofísica,Departamento de Recursos Naturales,Universidad Nacional Autónoma de México,04360,México CDMX,Mexico [2]Universidad Nacional Autónoma de México,04510,México CDMX,Mexico [3]Earth Sciences Postgraduate Program,Universidad Nacional Autónoma de México,04510,México,CDMX,Mexico

出　　处：《Journal of Earth Science》2024年第6期2099-2118,共20页地球科学学刊（英文版）

基　　金：financed partially by PAPIIT-DGAPA(Contribution IN-105023)。

摘　　要：Several aquifers located in North-Central Mexico have natural arsenic(As)concentrations higher than those allowed by national and international regulations;these aquifers are usually located in fractured volcanic environments that interact with sedimentary basins and have a carbonate basement.In this study,an evaluation of As in volcanic and sedimentary rocks collected at 13 sampling sites along the Sierra de Codornices(Guanajuato State,Central Mexico)was carried out.These geologic materials are representative of the dominant hydrogeologic environment.The As content is disseminated in volcanic rocks and the highest contents were obtained in felsic rocks;this information served to identify the hydrogeochemical processes related to the mobilization and transport of arsenic in the aquifer.The mobilization of As is a product of the dissolution of volcanic glass,a process involved in the alkaline desorption that occurs on As-containing mineral surfaces and possibly by the dissolution/desorption of Fe minerals and some clays,all these processes may be accelerated by the geothermal characteristics of the groundwater in the study area.

关 键 词：arsenic mobilization GROUNDWATER volcanic rocks geothermal aquifer CO_(2) geochemistry HYDROGEOLOGY 

分 类 号：X523[环境科学与工程—环境工程] P641.3[天文地球—地质矿产勘探]