Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)

The speleothems of Castañar Cave are made of a complex mineralogical association including aragonite, dolomite, huntite, hydromagnesite and a small proportion of Mg-rich clays whose mineralogy is difficult to determine. These clays appear as thin mats composed by fibres that are commonly associated...

ver descrição completa

Detalhes bibliográficos
Autores: Martín Pérez, Andrea, Alonso Zarza, Ana María, La Iglesia, Á., Martín García, Rebeca
Formato: artículo
Fecha de publicación:2015
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/35131
Acesso em linha:https://hdl.handle.net/20.500.14352/35131
Access Level:acceso abierto
Palavra-chave:551.44(460.251)
(460.251)551.44
549.6(460.251)
(460.251)549.6
Dolomite
Mg clays
Huntite
Speleothem
Dolomita
Arcillas magnesianas
Huntita
Espeleotema
Geología
Geodinámica
Mineralogía (Geología)
2506 Geología
2507 Geofísica
2506.11 Mineralogía
id ES_ad15f012a2fc82c84e644d64b01671ae
oai_identifier_str oai:docta.ucm.es:20.500.14352/35131
network_acronym_str ES
network_name_str España
repository_id_str
spelling Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)¿Cuál es el papel de las arcillas magnesianas en la formación de dolomita en ambientes alcalinos? Un ejemplo de la cueva de Castañar, Cáceres (España)Martín Pérez, AndreaAlonso Zarza, Ana MaríaLa Iglesia, Á.Martín García, Rebeca551.44(460.251)(460.251)551.44549.6(460.251)(460.251)549.6DolomiteMg claysHuntiteSpeleothemDolomitaArcillas magnesianasHuntitaEspeleotemaGeologíaGeodinámicaMineralogía (Geología)2506 Geología2507 Geofísica2506.11 MineralogíaThe speleothems of Castañar Cave are made of a complex mineralogical association including aragonite, dolomite, huntite, hydromagnesite and a small proportion of Mg-rich clays whose mineralogy is difficult to determine. These clays appear as thin mats composed by fibres that are commonly associated to dolomite. The composition of cave waters and the textural relationship between the minerals indicate that in these alkaline environments there are several possible evaporation/concentration stages (with waters with pH > 8) followed by other stages characterized by freshwater entrances. All this result in complex precipitation sequences in which Ca and Mg are always available, and then it is silica content the main factor driving Mg-clay formation.The high Mg/Ca ratios drive initial aragonite precipitation, which contributes to an additional increase in this ratio enabling precipitation of huntite and Mg-clays (if silica is available). The following stage is dolomite formation either by replacement of metastable huntite or by direct precipitation on the Mg-clays that act as templates.Sociedad Geológica de EspañaUniversidad Complutense de Madrid20152015-01-0120152015-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/35131reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/351312026-06-02T12:44:21Z
dc.title.none.fl_str_mv Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
¿Cuál es el papel de las arcillas magnesianas en la formación de dolomita en ambientes alcalinos? Un ejemplo de la cueva de Castañar, Cáceres (España)
title Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
spellingShingle Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
Martín Pérez, Andrea
551.44(460.251)
(460.251)551.44
549.6(460.251)
(460.251)549.6
Dolomite
Mg clays
Huntite
Speleothem
Dolomita
Arcillas magnesianas
Huntita
Espeleotema
Geología
Geodinámica
Mineralogía (Geología)
2506 Geología
2507 Geofísica
2506.11 Mineralogía
title_short Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
title_full Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
title_fullStr Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
title_full_unstemmed Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
title_sort Do magnesian clays play a role in dolomite formation in alkaline environments? An example from Castañar Cave, Cáceres (Spain)
dc.creator.none.fl_str_mv Martín Pérez, Andrea
Alonso Zarza, Ana María
La Iglesia, Á.
Martín García, Rebeca
author Martín Pérez, Andrea
author_facet Martín Pérez, Andrea
Alonso Zarza, Ana María
La Iglesia, Á.
Martín García, Rebeca
author_role author
author2 Alonso Zarza, Ana María
La Iglesia, Á.
Martín García, Rebeca
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.44(460.251)
(460.251)551.44
549.6(460.251)
(460.251)549.6
Dolomite
Mg clays
Huntite
Speleothem
Dolomita
Arcillas magnesianas
Huntita
Espeleotema
Geología
Geodinámica
Mineralogía (Geología)
2506 Geología
2507 Geofísica
2506.11 Mineralogía
topic 551.44(460.251)
(460.251)551.44
549.6(460.251)
(460.251)549.6
Dolomite
Mg clays
Huntite
Speleothem
Dolomita
Arcillas magnesianas
Huntita
Espeleotema
Geología
Geodinámica
Mineralogía (Geología)
2506 Geología
2507 Geofísica
2506.11 Mineralogía
description The speleothems of Castañar Cave are made of a complex mineralogical association including aragonite, dolomite, huntite, hydromagnesite and a small proportion of Mg-rich clays whose mineralogy is difficult to determine. These clays appear as thin mats composed by fibres that are commonly associated to dolomite. The composition of cave waters and the textural relationship between the minerals indicate that in these alkaline environments there are several possible evaporation/concentration stages (with waters with pH > 8) followed by other stages characterized by freshwater entrances. All this result in complex precipitation sequences in which Ca and Mg are always available, and then it is silica content the main factor driving Mg-clay formation.The high Mg/Ca ratios drive initial aragonite precipitation, which contributes to an additional increase in this ratio enabling precipitation of huntite and Mg-clays (if silica is available). The following stage is dolomite formation either by replacement of metastable huntite or by direct precipitation on the Mg-clays that act as templates.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-01-01
2015
2015-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/35131
url https://hdl.handle.net/20.500.14352/35131
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedad Geológica de España
publisher.none.fl_str_mv Sociedad Geológica de España
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869416410755629056
score 15,301603

Registos relacionados