The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system

This research was carried out while DDV was granted with a Juan de la Cierva fellowship from the Spanish Government.

Detalles Bibliográficos
Autores: Domínguez Villar, David, Vázquez-Navarro, Juan A., Krklec, Kristina
Tipo de recurso: artículo
Estado:Versión borrador
Fecha de publicación:2016
País:España
Institución:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:dnet:gredos______::106ce0d62ea1b9fc2e1a6edc3044d2b9
Acceso en línea:http://hdl.handle.net/10366/170929
Access Level:acceso abierto
Palabra clave:Hydrochemistry
Tufa
Calcite
Gypsum
Incongruent dissolution of dolomite
2506 Geología
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spelling The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst systemDomínguez Villar, DavidVázquez-Navarro, Juan A.Krklec, KristinaHydrochemistryTufaCalciteGypsumIncongruent dissolution of dolomite2506 GeologíaThis research was carried out while DDV was granted with a Juan de la Cierva fellowship from the Spanish Government.[EN]The precipitation of freshwater carbonates (tufa) along karstic rivers is enhanced by degassing of carbon dioxide (CO2) downstream of karstic springs. However, in most karstic springs CO2 degassing is not enough to force the precipitation of tufa sediments. Little is known about the role of dissolution of gypsum or dolomite in the hydrochemistry of these systems and how this affects the formation of tufa deposits. Here we present a monitoring study conducted over a year in Trabaque River (Spain). The river has typical karst hydrological dynamics with water sinking upstream and re-emerging downstream of the canyon. Mixing of calcium–magnesium bicarbonate and calcium sulphate waters downstream of the sink enhances the dissolution of carbonates and potentially plays a positive role in the formation of tufa sediments. However, due to the common-ion effect, dissolution of dolomite and/or gypsum causes precipitation of underground calcite cements as part of the incongruent dissolution of dolomite/dedolomitization process, which limits the precipitation of tufa sediments. Current precipitation of tufa is scant compared to previous Holocene tufa deposits, which likely precipitated from solutions with higher saturation indexes of calcite (SIcc values) than nowadays. Limited incongruent dissolution of dolomite/dedolomitization favours higher SIcc values. This circumstance occurs when waters with relatively high supersaturation of dolomite and low SO4 2 composition sink in the upper sector of the canyon. In such a scenario, the process of mixing waters enhances the exclusive dissolution of limestones, preventing the precipitation of calcite within the aquifer and favouring the increase of SIcc values downstream of the springs. Such conditions were recorded during periods of high water level of the aquifers and during floods. This research shows that the common-ion effect caused by the dissolution of gypsum and/or dolomite rocks can limit [or favour] the precipitation of tufa sediments depending on the occurrence [or not] of incongruent dissolution of dolomite/dedolomitization.WILEY202620262016info:eu-repo/semantics/articleinfo:eu-repo/semantics/draftapplication/pdfhttp://hdl.handle.net/10366/170929reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)InglésAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:dnet:gredos______::106ce0d62ea1b9fc2e1a6edc3044d2b92026-06-07T06:28:51Z
dc.title.none.fl_str_mv The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
title The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
spellingShingle The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
Domínguez Villar, David
Hydrochemistry
Tufa
Calcite
Gypsum
Incongruent dissolution of dolomite
2506 Geología
title_short The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
title_full The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
title_fullStr The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
title_full_unstemmed The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
title_sort The role of gypsum and/or dolomite dissolution in tufa precipitation: lessons from the hydrochemistry of a carbonate–sulphate karst system
dc.creator.none.fl_str_mv Domínguez Villar, David
Vázquez-Navarro, Juan A.
Krklec, Kristina
author Domínguez Villar, David
author_facet Domínguez Villar, David
Vázquez-Navarro, Juan A.
Krklec, Kristina
author_role author
author2 Vázquez-Navarro, Juan A.
Krklec, Kristina
author2_role author
author
dc.subject.none.fl_str_mv Hydrochemistry
Tufa
Calcite
Gypsum
Incongruent dissolution of dolomite
2506 Geología
topic Hydrochemistry
Tufa
Calcite
Gypsum
Incongruent dissolution of dolomite
2506 Geología
description This research was carried out while DDV was granted with a Juan de la Cierva fellowship from the Spanish Government.
publishDate 2016
dc.date.none.fl_str_mv 2016
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/draft
format article
status_str draft
dc.identifier.none.fl_str_mv http://hdl.handle.net/10366/170929
url http://hdl.handle.net/10366/170929
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv WILEY
publisher.none.fl_str_mv WILEY
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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