T239 Sources, Transport, Fate, and Toxicology of Trace Elements in the Environment I
Tuesday, 7 October 2008
8:00 AM - 12:00 PM
Hydrogeochemical Modelling of a Springs System, Xalapa, East Central MEXICO
Paper number: T239-4
Program: Technical Sessions
Time: 8:30 AM – 8:45 AM
Authors
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Alejandro Carrillo-ChávezUNAM, Queretaro, N/A
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Alejandra CortesGEOPHYSICS INSTITUTE, Mexico, D.F, N/A
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Sergio RodriguezGeology Institute, Mexico, D.F, N/A
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Juan Perez-QuezadasInstituto de Geofisica, Universidad Nacional Autonoma de Mexico, Mexico, D.F, N/A
Abstract
Twenty three water springs were sampled along a mountainous section of some 50 km from 1185 m to 131 m altitude above sea level. Total dissolved solids from the water samples vary from 54 to 1,200 mg/l, in general increasing downhill. The groundwater goes through volcanic rock (mostly basalts and pyroclasts) first, and then through limestone. Hydrogeochemical evolution of groundwater using PHREEQC, was used to analyse water-rock interaction and possible different flow paths for groundwater. The results show a deeper flow with higher temperatures and higher rock-water interaction, and some shorter shallow flow-paths with lower temperatures and lower rock-water interaction. Water chemistry from some springs could only be explained with an anthropogenic component in a mixing system. A conceptual model for groundwater circulation is presented, indicating chemical reactions along the paths.