Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry
A review and a synthesis of the geological, mineralogical, and crystal chemical data available in the literature on active Spanish bentonitic exploitations were done, and at the same time, new data are provided from a set of representative samples from these deposits. They were located in three diff...
| Autores: | , , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/13784 |
| Acesso em linha: | https://hdl.handle.net/20.500.14352/13784 |
| Access Level: | acceso abierto |
| Palavra-chave: | 553.611 549.6 bentonite smectite Mg clays stevensite saponite montmorillonite beidellite kerolite Geología Mineralogía (Geología) 2506 Geología 2506.11 Mineralogía |
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Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal ChemistryGarcía Romero, EmiliaManchado, Eva MaríaSuárez, MercedesGarcía Rivas, Javier553.611549.6bentonitesmectiteMg claysstevensitesaponitemontmorillonitebeidellitekeroliteGeologíaMineralogía (Geología)2506 Geología2506.11 MineralogíaA review and a synthesis of the geological, mineralogical, and crystal chemical data available in the literature on active Spanish bentonitic exploitations were done, and at the same time, new data are provided from a set of representative samples from these deposits. They were located in three different areas with different geological origins: (1) Miocene sedimentary deposits from the Tajo Basin (Madrid–Toledo provinces) in the center of the Iberian Peninsula, where bentonites appear in two different units named for their colors (Green Clays and Pink Clays); (2) samples from Tamame de Sayago (Zamora province) originating from the hydrothermal alteration of granitic Variscan rocks; and 3) Miocene deposits originating from the hydrothermal alteration of volcanic or subvolcanic rocks from the Cabo de Gata volcanic area (Almería Province) in the southern part of Spain, where the three main deposits (Cortijo de Archidona, Los Trancos, and Morrón de Mateo) were studied. The bentonites from the Tajo Basin were formed mainly by trioctahedral smectites, and there were significant mineralogical differences between the Green and Pink Clays, both in terms of the contents of impurities and in terms of smectite crystallochemistry and crystallinity. The smectites from Tamame de Sayago were dioctahedral (montmorillonite–beidellite series), and they appeared with kaolinite, quartz, and mica in all possible proportions, from almost pure bentonite to kaolin. Finally, the compositions of the bentonites from the three studied deposits in Cabo de Gata were quite similar, and zeolites and plagioclases were the main impurities. The structural formulae of the smectites from Cortijo de Archidona and Los Trancos showed a continuous compositional variation in beidellite–montmorillonite, while in Morrón de Mateo, the smectites were mainly montmorillonite, although there was continuous compositional variation from Al montmorillonites to Fe–Mg-rich saponites. The variation in the smectite composition is due to the intrusion of a volcanic dome, which brings new fluids that alter the initial composition of the smectites.MDPIUniversidad Complutense de Madrid20192019-01-0120192019-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/13784reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/137842026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| title |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| spellingShingle |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry García Romero, Emilia 553.611 549.6 bentonite smectite Mg clays stevensite saponite montmorillonite beidellite kerolite Geología Mineralogía (Geología) 2506 Geología 2506.11 Mineralogía |
| title_short |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| title_full |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| title_fullStr |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| title_full_unstemmed |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| title_sort |
Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry |
| dc.creator.none.fl_str_mv |
García Romero, Emilia Manchado, Eva María Suárez, Mercedes García Rivas, Javier |
| author |
García Romero, Emilia |
| author_facet |
García Romero, Emilia Manchado, Eva María Suárez, Mercedes García Rivas, Javier |
| author_role |
author |
| author2 |
Manchado, Eva María Suárez, Mercedes García Rivas, Javier |
| author2_role |
author author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
553.611 549.6 bentonite smectite Mg clays stevensite saponite montmorillonite beidellite kerolite Geología Mineralogía (Geología) 2506 Geología 2506.11 Mineralogía |
| topic |
553.611 549.6 bentonite smectite Mg clays stevensite saponite montmorillonite beidellite kerolite Geología Mineralogía (Geología) 2506 Geología 2506.11 Mineralogía |
| description |
A review and a synthesis of the geological, mineralogical, and crystal chemical data available in the literature on active Spanish bentonitic exploitations were done, and at the same time, new data are provided from a set of representative samples from these deposits. They were located in three different areas with different geological origins: (1) Miocene sedimentary deposits from the Tajo Basin (Madrid–Toledo provinces) in the center of the Iberian Peninsula, where bentonites appear in two different units named for their colors (Green Clays and Pink Clays); (2) samples from Tamame de Sayago (Zamora province) originating from the hydrothermal alteration of granitic Variscan rocks; and 3) Miocene deposits originating from the hydrothermal alteration of volcanic or subvolcanic rocks from the Cabo de Gata volcanic area (Almería Province) in the southern part of Spain, where the three main deposits (Cortijo de Archidona, Los Trancos, and Morrón de Mateo) were studied. The bentonites from the Tajo Basin were formed mainly by trioctahedral smectites, and there were significant mineralogical differences between the Green and Pink Clays, both in terms of the contents of impurities and in terms of smectite crystallochemistry and crystallinity. The smectites from Tamame de Sayago were dioctahedral (montmorillonite–beidellite series), and they appeared with kaolinite, quartz, and mica in all possible proportions, from almost pure bentonite to kaolin. Finally, the compositions of the bentonites from the three studied deposits in Cabo de Gata were quite similar, and zeolites and plagioclases were the main impurities. The structural formulae of the smectites from Cortijo de Archidona and Los Trancos showed a continuous compositional variation in beidellite–montmorillonite, while in Morrón de Mateo, the smectites were mainly montmorillonite, although there was continuous compositional variation from Al montmorillonites to Fe–Mg-rich saponites. The variation in the smectite composition is due to the intrusion of a volcanic dome, which brings new fluids that alter the initial composition of the smectites. |
| publishDate |
2019 |
| dc.date.none.fl_str_mv |
2019 2019-01-01 2019 2019-01-01 |
| 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/20.500.14352/13784 |
| url |
https://hdl.handle.net/20.500.14352/13784 |
| 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 Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ |
| 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 Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
MDPI |
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MDPI |
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reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
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Universidad Complutense de Madrid (UCM) |
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Docta Complutense |
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Docta Complutense |
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