GOMEZ Maria Laura
Hydrogeology and hidrogeochemical modeling in phreatic aquifer of NE Mendoza, Argentina
GOMEZ, M. L.; ARANIBAR, J.; WILLOUD, RODOLFO; RUBIO, C.; MARTÍNEZ, DANIEL EMILIO; SORIA, D; MONASTERIO, R; VILLAGRA, PABLO; GOIRAN, S.
JOURNAL OF IBERIAN GEOLOGY
Lugar: Madrid; Año: 2014 vol. 3 p. 521 - 521
Revista en Q1The objective of this study is to develop a conceptual hydrogeological model and evaluate groundwater hydrochemical characteristicsof the aquifer in the Guanacache Travesía, in the central Monte desert of Mendoza (Argentina). The region has been granted to aboriginalcommunities for communal use and is experiencing economic development. The area has limited surface water resources and relies ongroundwater for economic activities, and in many cases, for human consumption. There are no hydrogeochemical studies on the quality ofthis water as drinking water or its suitability for agriculture and raising livestock. The present study provides information on water qualityand availability in the northeast of Mendoza Province. Is included detailed review of relevant bibliography, including scattered andunpublished studies with geological and geomorphological data. Is included water level measurements, a definition of water flow directionand hydrochemical analyses, including some trace element and isotopic data. The hydrogeological model shows a discharge area characterizedby vertical upward flows, evident by thermal waters, lakes, salt deposits and the presence of reduced arsenic in some boreholes. Thedominance of fine sediments, low relief, scarce local precipitation, low recharge from precipitation, and low groundwater velocities resultin long residence times for groundwater and poor renovation (with remote recharge area). Groundwater has high salt content and hardness,as well as trace elements such as fluoride and arsenic. Localized patches of low salinity waters are found along paleochannels. The isotopicsignature of these waters indicates distant precipitation from the mountains, which could also have recharged the aquifer in historic times.In addition to the important geologic controls on surface and groundwater flows, human activities affect local conditions of the aquifer nearlivestock gathering areas, increasing nitrate concentrations and the proportion of As(III) relative to As(V).