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Abstract:

Most of the cities southeast of Buenos Aires, Argentina, depend heavily on ground water for water supply. Whereas ground water quality is generally good in the region, economic development along the coastal plain has been constrained by high salinities. Fifty-four wells were sampled for major ions in zones of recharge, transport and discharge in an area near La Plata, 50 km southeast of Buenos Aires. The shallow, southwest to northeast coastal flow system is >30 km long but is only 50 to 80 m thick. It consists of Plio-Pleistocene fluvial sand overlain by Pleistocene eolian and fluvial silt and Holocene estuarine silty clay. Hydrochemical endmembers include HCO3, SO4, and Cl water. Bicarbonate-type water includes high plain recharge water (Ca-Na-HCO3) that evolves through cation exchange and calcite dissolution to a high pH, pure Na-HCO3 endmember at the southwest edge of the coastal plain. Similar Na-HCO3 water is also found underlying recharge areas of the central coastal plain, and a lens of Ca-HCO3 water is associated with a ridge of shell debris parallel to the coast. Mixed cation-Cl water near the coastline represents intruded sea water that has undergone cation exchange. Chemically similar water underlying the southwest coastal plain, however, can be shown isotopically to have formed from fairly dilute solutions concentrated many times by evapotranspiration. In the central coastal plain, Na-SO4-Cl water (up to 17,000 mg/L SO4) underlies hummocks and, at depth, forms plumes in the subsurface. The chemical controls are dissolution of gypsum precipitated during pyrite oxidation, evapotranspiration, and calcite precipitation. This extreme diversity of water chemistry in a shallow, clastic flow system is uncommon. It is made possible by (1) the presence of oxidized, originally pyritic, but slightly permeable sediments that have been exposed to evolving geochemical and hydrodynamic conditions, and (2) highly focused recharge that favors the development of fresh water bodies underlying recharge zones and stagnant, evaporated water underlying other areas. Most of the cities southeast of Buenos Aires, Argentina, depend heavily on ground water for water supply. Whereas ground water quality is generally good in the region, economic development along the coastal plain has been constrained by high salinities. Fifty-four wells were sampled for major ions in zones of recharge, transport and discharge in an area near La Plata, 50 km southeast of Buenos Aires. The shallow, southwest to northeast coastal flow system is >30 km long but is only 50 to 80 m thick. It consists of Plio-Pleistocene fluvial sand overlain by Pleistocene eolian and fluvial silt and Holocene estuarine silty clay. Hydrochemical endmembers include HCO3, SO4, and Cl water. Bicarbonate-type water includes high plain recharge water (Ca-Na-HCO3) that evolves through cation exchange and calcite dissolution to a high pH, pure Na-HCO3 endmember at the southwest edge of the coastal plain. Similar Na-HCO3 water is also found underlying recharge areas of the central coastal plain, and a lens of Ca-HCO3 water is associated with a ridge of shell debris parallel to the coast. Mixed cation-Cl water near the coastline represents intruded sea water that has undergone cation exchange. Chemically similar water underlying the southwest coastal plain, however, can be shown isotopically to have formed from fairly dilute solutions concentrated many times by evapotranspiration. In the central coastal plain, Na-SO4-Cl water (up to 17,000 mg/L SO4) underlies hummocks and, at depth, forms plumes in the subsurface. The chemical controls are dissolution of gypsum precipitated during pyrite oxidation, evapotranspiration, and calcite precipitation. This extreme diversity of water chemistry in a shallow, clastic flow system is uncommon. It is made possible by (1) the presence of oxidized, originally pyritic, but slightly permeable sediments that have been exposed to evolving geochemical and hydrodynamic conditions, and (2) highly focused recharge that favors the development of fresh water bodies underlying recharge zones and stagnant, evaporated water underlying other areas.

Registro:

Documento: Artículo
Título:Bicarbonate, sulfate, and chloride water in a shallow, clastic-dominated coastal flow system, Argentina
Autor:Logan, W.S.; Auge, M.P.; Panarello, H.O.
Ciudad:Westerville
Filiación:Department of Geology, George Washington University, Washington, DC 20052, United States
Departamento de Geología, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428 Buenos Aires, Argentina
Inst. Geocronologia y Geol. I., Ciudad Universitaria, Pabellón INGEIS, 1428 Buenos Aires, Argentina
Palabras clave:Carbonates; Chlorine compounds; Discharge (fluid mechanics); Estuaries; Hydrodynamics; Recharging (underground waters); Salt water intrusion; Sulfur compounds; Water analysis; Water quality; Water supply; Water wells; Chloride; Sulfate; Groundwater resources; coastal aquifer; groundwater; water chemistry; water quality; Argentina; Buenos Aires
Año:1999
Volumen:37
Número:2
Página de inicio:287
Página de fin:295
DOI: http://dx.doi.org/10.1111/j.1745-6584.1999.tb00986.x
Título revista:Ground Water
Título revista abreviado:Ground Water
ISSN:0017467X
CODEN:GRWAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0017467X_v37_n2_p287_Logan

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Citas:

---------- APA ----------
Logan, W.S., Auge, M.P. & Panarello, H.O. (1999) . Bicarbonate, sulfate, and chloride water in a shallow, clastic-dominated coastal flow system, Argentina. Ground Water, 37(2), 287-295.
http://dx.doi.org/10.1111/j.1745-6584.1999.tb00986.x
---------- CHICAGO ----------
Logan, W.S., Auge, M.P., Panarello, H.O. "Bicarbonate, sulfate, and chloride water in a shallow, clastic-dominated coastal flow system, Argentina" . Ground Water 37, no. 2 (1999) : 287-295.
http://dx.doi.org/10.1111/j.1745-6584.1999.tb00986.x
---------- MLA ----------
Logan, W.S., Auge, M.P., Panarello, H.O. "Bicarbonate, sulfate, and chloride water in a shallow, clastic-dominated coastal flow system, Argentina" . Ground Water, vol. 37, no. 2, 1999, pp. 287-295.
http://dx.doi.org/10.1111/j.1745-6584.1999.tb00986.x
---------- VANCOUVER ----------
Logan, W.S., Auge, M.P., Panarello, H.O. Bicarbonate, sulfate, and chloride water in a shallow, clastic-dominated coastal flow system, Argentina. Ground Water. 1999;37(2):287-295.
http://dx.doi.org/10.1111/j.1745-6584.1999.tb00986.x