The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting

The Silurian to Devonian Almadén mercury deposits are directly 01' indirectly related to mafic rocks. The geochemical characteristics of these rocks suggest mantle-derived intraplate magmas, that yielded basalts (s.l.) and olivine diabases of alkaline affinity, and quartz-diabases of transition...

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Autores: Higueras, P., Oyarzun Muñoz, Roberto, Munhá, J., Morata, D.
Tipo de recurso: artículo
Fecha de publicación:2000
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/59441
Acceso en línea:https://hdl.handle.net/20.500.14352/59441
Access Level:acceso abierto
Palabra clave:553.3/.9(460.287)
(460.287)553.3/.9
Mercury
Almadén
alkaline mafic magmas
O-C-S isotopic data
hydrothermalcirculation
Mercurio
Magmas máficos alcalinos
Isótopos de O-C-S
Circulación hidrotermal
Mineralogía (Geología)
2506.11 Mineralogía
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oai_identifier_str oai:docta.ucm.es:20.500.14352/59441
network_acronym_str ES
network_name_str España
repository_id_str
spelling The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic settingHigueras, P.Oyarzun Muñoz, RobertoMunhá, J.Morata, D.553.3/.9(460.287)(460.287)553.3/.9MercuryAlmadénalkaline mafic magmasO-C-S isotopic datahydrothermalcirculationMercurioMagmas máficos alcalinosIsótopos de O-C-SCirculación hidrotermalMineralogía (Geología)2506.11 MineralogíaThe Silurian to Devonian Almadén mercury deposits are directly 01' indirectly related to mafic rocks. The geochemical characteristics of these rocks suggest mantle-derived intraplate magmas, that yielded basalts (s.l.) and olivine diabases of alkaline affinity, and quartz-diabases of transitional to tholeiitic affinity. These rocks may have been generated from a volatile- and incompatible elemeht-rich asthenospheric source of EM-I type. O, C, and S isotopic data provide new insights into the genesis of the Almadén mineralization. Close correspondence between estimated and observed 8180fluid values suggest that hydrothermal activity in the Almadén basin was favoured by interaction of basaltic rocks with seawater. The observed 813e values (-3.6%0 to - 9.0%0), together with the lack of correlation between 8180 and 813C, favour multiple carbon sources for the hydrothermal carbonates associated with the Almadén deposits, Le., besides seawater, both mantle and organic sedimentary carbon sources were contributors to these carbonates. This is supported by sulphur isotopic data (-1.6%0 to +9.0%0; cinnabar), which may reflect variable source compositions. Leaching of spilitic sulphur by geothermal waters provides an indirect mechanism for incorporating variable proportions of magmatic and seawater sulphur into the mineralizing fluids, explaining the different isotopic compositions of Hg sulphides. Ar-Ar, Rb/Sr, and 87Sr/88Sr data suggest that hydrothermal activity in the Almadén basin was long-Iasting, spanning both the Silurian and Devonian. The huge, unique Almadén Hg deposits would have required exceptional conditions for their genesis. It is proposed that a world-class geochemical anomaly such as Almadén should ultimately reflect the characteristics of the mantle source for the alkali basaltic magmas; indeed, mantle metasomatic activity and the initiallow degrees of partial mel'ting inherent to the genesis of the Almadén mafic magmas could have converged to pro vide an efficient mechanism for Hg pre-enrichment of the basaltic rocksSociedad Geológica de EspañaUniversidad Complutense de Madrid20002000-01-0120002000-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/59441reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/594412026-06-02T12:44:21Z
dc.title.none.fl_str_mv The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
title The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
spellingShingle The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
Higueras, P.
553.3/.9(460.287)
(460.287)553.3/.9
Mercury
Almadén
alkaline mafic magmas
O-C-S isotopic data
hydrothermalcirculation
Mercurio
Magmas máficos alcalinos
Isótopos de O-C-S
Circulación hidrotermal
Mineralogía (Geología)
2506.11 Mineralogía
title_short The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
title_full The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
title_fullStr The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
title_full_unstemmed The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
title_sort The Almadén mercury metallogenic cluster (Ciudad Real, Spain): alkaline magmatism leading to mineralization processes at an intraplate tectonic setting
dc.creator.none.fl_str_mv Higueras, P.
Oyarzun Muñoz, Roberto
Munhá, J.
Morata, D.
author Higueras, P.
author_facet Higueras, P.
Oyarzun Muñoz, Roberto
Munhá, J.
Morata, D.
author_role author
author2 Oyarzun Muñoz, Roberto
Munhá, J.
Morata, D.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 553.3/.9(460.287)
(460.287)553.3/.9
Mercury
Almadén
alkaline mafic magmas
O-C-S isotopic data
hydrothermalcirculation
Mercurio
Magmas máficos alcalinos
Isótopos de O-C-S
Circulación hidrotermal
Mineralogía (Geología)
2506.11 Mineralogía
topic 553.3/.9(460.287)
(460.287)553.3/.9
Mercury
Almadén
alkaline mafic magmas
O-C-S isotopic data
hydrothermalcirculation
Mercurio
Magmas máficos alcalinos
Isótopos de O-C-S
Circulación hidrotermal
Mineralogía (Geología)
2506.11 Mineralogía
description The Silurian to Devonian Almadén mercury deposits are directly 01' indirectly related to mafic rocks. The geochemical characteristics of these rocks suggest mantle-derived intraplate magmas, that yielded basalts (s.l.) and olivine diabases of alkaline affinity, and quartz-diabases of transitional to tholeiitic affinity. These rocks may have been generated from a volatile- and incompatible elemeht-rich asthenospheric source of EM-I type. O, C, and S isotopic data provide new insights into the genesis of the Almadén mineralization. Close correspondence between estimated and observed 8180fluid values suggest that hydrothermal activity in the Almadén basin was favoured by interaction of basaltic rocks with seawater. The observed 813e values (-3.6%0 to - 9.0%0), together with the lack of correlation between 8180 and 813C, favour multiple carbon sources for the hydrothermal carbonates associated with the Almadén deposits, Le., besides seawater, both mantle and organic sedimentary carbon sources were contributors to these carbonates. This is supported by sulphur isotopic data (-1.6%0 to +9.0%0; cinnabar), which may reflect variable source compositions. Leaching of spilitic sulphur by geothermal waters provides an indirect mechanism for incorporating variable proportions of magmatic and seawater sulphur into the mineralizing fluids, explaining the different isotopic compositions of Hg sulphides. Ar-Ar, Rb/Sr, and 87Sr/88Sr data suggest that hydrothermal activity in the Almadén basin was long-Iasting, spanning both the Silurian and Devonian. The huge, unique Almadén Hg deposits would have required exceptional conditions for their genesis. It is proposed that a world-class geochemical anomaly such as Almadén should ultimately reflect the characteristics of the mantle source for the alkali basaltic magmas; indeed, mantle metasomatic activity and the initiallow degrees of partial mel'ting inherent to the genesis of the Almadén mafic magmas could have converged to pro vide an efficient mechanism for Hg pre-enrichment of the basaltic rocks
publishDate 2000
dc.date.none.fl_str_mv 2000
2000-01-01
2000
2000-01-01
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/20.500.14352/59441
url https://hdl.handle.net/20.500.14352/59441
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
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score 15,300719

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