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Origin of waters from small springs located at the northern coast of Chile, in the vicinity of Antofagasta
Herrera Lameli, Christian; Custodio Gimena, Emilio
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. GHS - Grup d'Hidrologia Subterrània
The origin of waters from small springs located at the hyper-arid northern coast of Chile, in the vicinity of Antofagasta, is discussed after hydrogeochemical and isotopic studies and supported by groundwater flow hydrodynamic considerations. Spring water is brackish to saline, with electrical conductivity ranging from 2 to 25 mS/cm. Chemical and water isotope data (O-18 and H-2) show that the rainfall events that produced part of the recharge could correspond to wetter conditions than at present. Their origin could be related to the emplacement of warm sea currents facing the coast of northern Chile, possibly associated to incursions of El Nino Southern Oscillation (ENSO). Radiocarbon dating and preliminary groundwater hydraulic calculations indicate that these spring waters could be remnants of a more significant recharge in the Cordillera de la Costa than that produced today during the less arid period about 5,000 to 3,000 years ago. The exception is Las Vertientes spring which is the only one that receives water transferred from the Central Depression. The springs are the visible discharge of a regional groundwater body in the very low permeability Cordillera de la Costa, whose hydraulic conductivity decreases downward and flow is dominantly though fissures and storage in the low porosity rock matrix.
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània
Antofagasta (Chile : Region)
Aquifers--South America
Cordillera de la Costa
Antofagasta
Spring
Groundwater
Stable isotopes
Radiocarbon
Arid climate
Recharge
Atacama desert
isotopic composition
pollen record
lat 22-degrees-24-degrees-s
groundwater recharge
climate-change
region
precipitation
evolution
nitrate
Cordillera de la Costa
Antofagasta
Manantiales
Aguas subterráneas
Isótopos estables
Radiocarbono
Clima árido
Recarga
Aqüífers
Xile
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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