Role of fluid mixing in deep dissolution of carbonates

The presence of cavities filled with new minerals in carbonate rocks is a common feature in oil reservoirs and lead-zinc deposits. Since groundwater equilibrates rapidly with carbonates, the presence of dissolution cavities in deep carbonate host rocks is a paradox. Two alternative geochemical proce...

Descripción completa

Detalles Bibliográficos
Autores: Corbella, M., Ayora, Carlos
Tipo de recurso: artículo
Fecha de publicación:2003
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/2473
Acceso en línea:http://hdl.handle.net/10261/2473
Access Level:acceso abierto
Palabra clave:Hydrothermal karst
MVT deposits
Reactive transport
Fluid mixing
Carbonate dissolution
id ES_5aa6ff86bfba16cb3abf4c951d7282f3
oai_identifier_str oai:digital.csic.es:10261/2473
network_acronym_str ES
network_name_str España
repository_id_str
spelling Role of fluid mixing in deep dissolution of carbonatesCorbella, M.Ayora, CarlosHydrothermal karstMVT depositsReactive transportFluid mixingCarbonate dissolutionThe presence of cavities filled with new minerals in carbonate rocks is a common feature in oil reservoirs and lead-zinc deposits. Since groundwater equilibrates rapidly with carbonates, the presence of dissolution cavities in deep carbonate host rocks is a paradox. Two alternative geochemical processes have been proposed to dissolve carbonates at depth: hydrogen sulfide oxidation to sulfuric acid, and metal sulfide precipitation. With the aid of geochemical modeling we show that mixing two warm solutions saturated with carbonate results in a new solution that dissolves limestone. Variations in the proportion of the end-member fluids can also form a supersaturated mixture and fill the cavity with a new generation of carbonate. Mixing is in general more effective in dissolving carbonates than the aforementioned processes. Moreover, mixing is consistent with the wide set of textures and mineral proportions observed in cavity infillings.Part of this research was funded by the Spanish Ministry of Education and Culture through grant DGESIC-PB98-0901. The reactive transport code RETRASO was developed under a contract with ENRESA (Spain).Peer reviewedConsejo Superior de Investigaciones Científicas (España)Universidad de Barcelona200720072003info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/2473reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/24732026-05-22T06:33:51Z
dc.title.none.fl_str_mv Role of fluid mixing in deep dissolution of carbonates
title Role of fluid mixing in deep dissolution of carbonates
spellingShingle Role of fluid mixing in deep dissolution of carbonates
Corbella, M.
Hydrothermal karst
MVT deposits
Reactive transport
Fluid mixing
Carbonate dissolution
title_short Role of fluid mixing in deep dissolution of carbonates
title_full Role of fluid mixing in deep dissolution of carbonates
title_fullStr Role of fluid mixing in deep dissolution of carbonates
title_full_unstemmed Role of fluid mixing in deep dissolution of carbonates
title_sort Role of fluid mixing in deep dissolution of carbonates
dc.creator.none.fl_str_mv Corbella, M.
Ayora, Carlos
author Corbella, M.
author_facet Corbella, M.
Ayora, Carlos
author_role author
author2 Ayora, Carlos
author2_role author
dc.subject.none.fl_str_mv Hydrothermal karst
MVT deposits
Reactive transport
Fluid mixing
Carbonate dissolution
topic Hydrothermal karst
MVT deposits
Reactive transport
Fluid mixing
Carbonate dissolution
description The presence of cavities filled with new minerals in carbonate rocks is a common feature in oil reservoirs and lead-zinc deposits. Since groundwater equilibrates rapidly with carbonates, the presence of dissolution cavities in deep carbonate host rocks is a paradox. Two alternative geochemical processes have been proposed to dissolve carbonates at depth: hydrogen sulfide oxidation to sulfuric acid, and metal sulfide precipitation. With the aid of geochemical modeling we show that mixing two warm solutions saturated with carbonate results in a new solution that dissolves limestone. Variations in the proportion of the end-member fluids can also form a supersaturated mixture and fill the cavity with a new generation of carbonate. Mixing is in general more effective in dissolving carbonates than the aforementioned processes. Moreover, mixing is consistent with the wide set of textures and mineral proportions observed in cavity infillings.
publishDate 2003
dc.date.none.fl_str_mv 2003
2007
2007
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/2473
url http://hdl.handle.net/10261/2473
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Consejo Superior de Investigaciones Científicas (España)
Universidad de Barcelona
publisher.none.fl_str_mv Consejo Superior de Investigaciones Científicas (España)
Universidad de Barcelona
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869408733311795200
score 15.812429

Similares en LA Referencia