Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)

Autores
Alvarez, Maria del Pilar; Carol, Eleonora Silvina; Bouza, Pablo Jose
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Evaporites are mineral facies frequently occurring in salt marsh environments in arid climates. Considering that groundwater and soil salinity play an important role in the development of salt marsh ecosystems, the aims of this work are to study the occurrence and precipitation/dissolution processes of evaporites of marine origin and to evaluate how such processes influence groundwater chemistry in the Fracasso Beach salt marsh (Península Valdés, Argentina). Groundwater and seawater samples were collected for isotopic and chemical analysis. Ionic speciation and saturation indices were estimated, and the modelling of theoretical seawater evaporation was undertaken. The estimation of the isotopic variations due to evaporation was carried out according to an analytical model. To study the evaporites, soil salt crust samples were collected in the different sectors of the marsh and then observed in a scanning electron microscope with an X-ray energy-scattering micro-analyzer. The evaporite minerals occurring in different areas of the salt marsh show that there are changes in the dominance and type of evaporites depending on the topographic height. In the most elevated areas, abundant halite and gypsum/anhydrite precipitates are registered, accompanied by epsomite and bischofite, whereas in the lower salt marsh, mainly halite can be observed and, to a lesser extent, gypsum and scarce epsomite. The dissolution of all the evaporites is verified in the groundwater chemistry; the results show that the process of precipitation/dissolution of marine evaporites is the main determinant of groundwater salinity in the Fracasso Beach salt marsh. The variation in ion content registered within the salt marsh is related to the recurrence of the tidal flooding in each sector, as it renews the groundwater. This indicates that in the highest sectors the evaporation percentages are higher, and it confirms that the occurrence of evaporite minerals is determined by their closeness to the sea, the topographic height and, therefore, by the flooding frequency.
Fil: Alvarez, Maria del Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Carol, Eleonora Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Bouza, Pablo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Materia
Geochemistry
Salt
Deposits
Wetlands
Patagonia
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/46188

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spelling Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)Alvarez, Maria del PilarCarol, Eleonora SilvinaBouza, Pablo JoseGeochemistrySaltDepositsWetlandsPatagoniahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Evaporites are mineral facies frequently occurring in salt marsh environments in arid climates. Considering that groundwater and soil salinity play an important role in the development of salt marsh ecosystems, the aims of this work are to study the occurrence and precipitation/dissolution processes of evaporites of marine origin and to evaluate how such processes influence groundwater chemistry in the Fracasso Beach salt marsh (Península Valdés, Argentina). Groundwater and seawater samples were collected for isotopic and chemical analysis. Ionic speciation and saturation indices were estimated, and the modelling of theoretical seawater evaporation was undertaken. The estimation of the isotopic variations due to evaporation was carried out according to an analytical model. To study the evaporites, soil salt crust samples were collected in the different sectors of the marsh and then observed in a scanning electron microscope with an X-ray energy-scattering micro-analyzer. The evaporite minerals occurring in different areas of the salt marsh show that there are changes in the dominance and type of evaporites depending on the topographic height. In the most elevated areas, abundant halite and gypsum/anhydrite precipitates are registered, accompanied by epsomite and bischofite, whereas in the lower salt marsh, mainly halite can be observed and, to a lesser extent, gypsum and scarce epsomite. The dissolution of all the evaporites is verified in the groundwater chemistry; the results show that the process of precipitation/dissolution of marine evaporites is the main determinant of groundwater salinity in the Fracasso Beach salt marsh. The variation in ion content registered within the salt marsh is related to the recurrence of the tidal flooding in each sector, as it renews the groundwater. This indicates that in the highest sectors the evaporation percentages are higher, and it confirms that the occurrence of evaporite minerals is determined by their closeness to the sea, the topographic height and, therefore, by the flooding frequency.Fil: Alvarez, Maria del Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; ArgentinaFil: Carol, Eleonora Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Bouza, Pablo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; ArgentinaElsevier Science2016-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/46188Alvarez, Maria del Pilar; Carol, Eleonora Silvina; Bouza, Pablo Jose; Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina); Elsevier Science; Marine Chemistry; 187; 11-2016; 35-420304-4203CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2016.10.005info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0304420316301797info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:47:47Zoai:ri.conicet.gov.ar:11336/46188instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:47:47.382CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
title Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
spellingShingle Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
Alvarez, Maria del Pilar
Geochemistry
Salt
Deposits
Wetlands
Patagonia
title_short Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
title_full Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
title_fullStr Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
title_full_unstemmed Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
title_sort Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina)
dc.creator.none.fl_str_mv Alvarez, Maria del Pilar
Carol, Eleonora Silvina
Bouza, Pablo Jose
author Alvarez, Maria del Pilar
author_facet Alvarez, Maria del Pilar
Carol, Eleonora Silvina
Bouza, Pablo Jose
author_role author
author2 Carol, Eleonora Silvina
Bouza, Pablo Jose
author2_role author
author
dc.subject.none.fl_str_mv Geochemistry
Salt
Deposits
Wetlands
Patagonia
topic Geochemistry
Salt
Deposits
Wetlands
Patagonia
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Evaporites are mineral facies frequently occurring in salt marsh environments in arid climates. Considering that groundwater and soil salinity play an important role in the development of salt marsh ecosystems, the aims of this work are to study the occurrence and precipitation/dissolution processes of evaporites of marine origin and to evaluate how such processes influence groundwater chemistry in the Fracasso Beach salt marsh (Península Valdés, Argentina). Groundwater and seawater samples were collected for isotopic and chemical analysis. Ionic speciation and saturation indices were estimated, and the modelling of theoretical seawater evaporation was undertaken. The estimation of the isotopic variations due to evaporation was carried out according to an analytical model. To study the evaporites, soil salt crust samples were collected in the different sectors of the marsh and then observed in a scanning electron microscope with an X-ray energy-scattering micro-analyzer. The evaporite minerals occurring in different areas of the salt marsh show that there are changes in the dominance and type of evaporites depending on the topographic height. In the most elevated areas, abundant halite and gypsum/anhydrite precipitates are registered, accompanied by epsomite and bischofite, whereas in the lower salt marsh, mainly halite can be observed and, to a lesser extent, gypsum and scarce epsomite. The dissolution of all the evaporites is verified in the groundwater chemistry; the results show that the process of precipitation/dissolution of marine evaporites is the main determinant of groundwater salinity in the Fracasso Beach salt marsh. The variation in ion content registered within the salt marsh is related to the recurrence of the tidal flooding in each sector, as it renews the groundwater. This indicates that in the highest sectors the evaporation percentages are higher, and it confirms that the occurrence of evaporite minerals is determined by their closeness to the sea, the topographic height and, therefore, by the flooding frequency.
Fil: Alvarez, Maria del Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
Fil: Carol, Eleonora Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Bouza, Pablo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico para el Estudio de los Ecosistemas Continentales; Argentina
description Evaporites are mineral facies frequently occurring in salt marsh environments in arid climates. Considering that groundwater and soil salinity play an important role in the development of salt marsh ecosystems, the aims of this work are to study the occurrence and precipitation/dissolution processes of evaporites of marine origin and to evaluate how such processes influence groundwater chemistry in the Fracasso Beach salt marsh (Península Valdés, Argentina). Groundwater and seawater samples were collected for isotopic and chemical analysis. Ionic speciation and saturation indices were estimated, and the modelling of theoretical seawater evaporation was undertaken. The estimation of the isotopic variations due to evaporation was carried out according to an analytical model. To study the evaporites, soil salt crust samples were collected in the different sectors of the marsh and then observed in a scanning electron microscope with an X-ray energy-scattering micro-analyzer. The evaporite minerals occurring in different areas of the salt marsh show that there are changes in the dominance and type of evaporites depending on the topographic height. In the most elevated areas, abundant halite and gypsum/anhydrite precipitates are registered, accompanied by epsomite and bischofite, whereas in the lower salt marsh, mainly halite can be observed and, to a lesser extent, gypsum and scarce epsomite. The dissolution of all the evaporites is verified in the groundwater chemistry; the results show that the process of precipitation/dissolution of marine evaporites is the main determinant of groundwater salinity in the Fracasso Beach salt marsh. The variation in ion content registered within the salt marsh is related to the recurrence of the tidal flooding in each sector, as it renews the groundwater. This indicates that in the highest sectors the evaporation percentages are higher, and it confirms that the occurrence of evaporite minerals is determined by their closeness to the sea, the topographic height and, therefore, by the flooding frequency.
publishDate 2016
dc.date.none.fl_str_mv 2016-11
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/46188
Alvarez, Maria del Pilar; Carol, Eleonora Silvina; Bouza, Pablo Jose; Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina); Elsevier Science; Marine Chemistry; 187; 11-2016; 35-42
0304-4203
CONICET Digital
CONICET
url http://hdl.handle.net/11336/46188
identifier_str_mv Alvarez, Maria del Pilar; Carol, Eleonora Silvina; Bouza, Pablo Jose; Precipitation/dissolution of marine evaporites as determinants in groundwater chemistry in a salt marsh (Península Valdés, Argentina); Elsevier Science; Marine Chemistry; 187; 11-2016; 35-42
0304-4203
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2016.10.005
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0304420316301797
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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