Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model

Vein and stratabound Zn-Pb sulfides are hosted within siliciclastic rocks and marine carbonates of Cretaceous age and within caprock carbonates at the margins of the Murguía and Orduña saline diapirs in the Basque-Cantabrian basin. Organic matter is ubiquitous, and textures indicate a genetic link t...

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Autores: Perona Moreno, Joaquim, Canals i Sabaté, Àngels, Cardellach López, Esteve
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2018
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/162496
Acceso en línea:https://hdl.handle.net/2445/162496
Access Level:acceso abierto
Palabra clave:Geologia
Geoquímica
Serralada Cantàbrica
Geology
Geochemistry
Cantabrian Mountains
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spelling Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic ModelPerona Moreno, JoaquimCanals i Sabaté, ÀngelsCardellach López, EsteveGeologiaGeoquímicaSerralada CantàbricaGeologyGeochemistryCantabrian MountainsVein and stratabound Zn-Pb sulfides are hosted within siliciclastic rocks and marine carbonates of Cretaceous age and within caprock carbonates at the margins of the Murguía and Orduña saline diapirs in the Basque-Cantabrian basin. Organic matter is ubiquitous, and textures indicate a genetic link to sulfide precipitation. Sulfides (pyrite, sphalerite, and galena) precipitated from brines with halogen ratios compatible with halite dissolution. Thermal indicators (fluid inclusion, organic matter, and sulfur isotope data), point to formation temperatures between 150° and 200°C. The δ34S values of sphalerite and galena (4.1-15.1¿) suggest a sulfur source related to the reduction of evaporite sulfate (thermochemical sulfate reduction) of Triassic age (15.3-17.4¿). The interaction of carbon-poor, metal- and sulfate-bearing hot brines with host rocks activated the cracking of organic matter, triggering sulfide precipitation at a rate controlled by the H2S production. Textural relationships suggest that ore precipitation was related to dolomitization of host rocks (siliciclastic rocks, marine carbonates, and caprock). The δ13C and d18O of carbonates range from 3.5 to -20.5¿ and from 16.1 to 28.7¿, respectively, indicative of different carbon sources and host-rock types. Carbonates associated with sulfide mineralization depict δ13C/δ18O assemblages and 87Sr/86Sr ratios (0.70801-0.71202) resulting from the interaction of a basinal brine with the different host rocks. Galena Pb isotope ratios¿206Pb/204Pb from 18.643 to 18.696, 207Pb/204Pb from 15.650 to 15.676, and 208Pb/204Pb from 38.720 to 38.780¿point to metal source rocks similar to other Mississippi Valley-type (MVT) deposits of the Basque-Cantabrian basin. Sulfide concentrations around the Murguía and Orduña diapirs are not concomitant with caprock formation but with dolomitization, as in MVT deposits. This is in contrast with the diapir-related deposits of the Gulf Coast and shares characteristics with the diapir-related mineralization in North Africa.Society of Economic Geologists2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/162496Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.5382/econgeo.2018.4584Economic Geology, 2018, vol. 113, num. 5, p. 1133-1159https://doi.org/10.5382/econgeo.2018.4584(c) Society of Economic Geologists, 2018info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1624962026-05-27T06:46:51Z
dc.title.none.fl_str_mv Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
title Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
spellingShingle Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
Perona Moreno, Joaquim
Geologia
Geoquímica
Serralada Cantàbrica
Geology
Geochemistry
Cantabrian Mountains
title_short Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
title_full Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
title_fullStr Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
title_full_unstemmed Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
title_sort Zn-Pb Mineralization Associated with Salt Diapirs in the Basque-Cantabrian Basin, Northern Spain: Geology, Geochemistry, and Genetic Model
dc.creator.none.fl_str_mv Perona Moreno, Joaquim
Canals i Sabaté, Àngels
Cardellach López, Esteve
author Perona Moreno, Joaquim
author_facet Perona Moreno, Joaquim
Canals i Sabaté, Àngels
Cardellach López, Esteve
author_role author
author2 Canals i Sabaté, Àngels
Cardellach López, Esteve
author2_role author
author
dc.subject.none.fl_str_mv Geologia
Geoquímica
Serralada Cantàbrica
Geology
Geochemistry
Cantabrian Mountains
topic Geologia
Geoquímica
Serralada Cantàbrica
Geology
Geochemistry
Cantabrian Mountains
description Vein and stratabound Zn-Pb sulfides are hosted within siliciclastic rocks and marine carbonates of Cretaceous age and within caprock carbonates at the margins of the Murguía and Orduña saline diapirs in the Basque-Cantabrian basin. Organic matter is ubiquitous, and textures indicate a genetic link to sulfide precipitation. Sulfides (pyrite, sphalerite, and galena) precipitated from brines with halogen ratios compatible with halite dissolution. Thermal indicators (fluid inclusion, organic matter, and sulfur isotope data), point to formation temperatures between 150° and 200°C. The δ34S values of sphalerite and galena (4.1-15.1¿) suggest a sulfur source related to the reduction of evaporite sulfate (thermochemical sulfate reduction) of Triassic age (15.3-17.4¿). The interaction of carbon-poor, metal- and sulfate-bearing hot brines with host rocks activated the cracking of organic matter, triggering sulfide precipitation at a rate controlled by the H2S production. Textural relationships suggest that ore precipitation was related to dolomitization of host rocks (siliciclastic rocks, marine carbonates, and caprock). The δ13C and d18O of carbonates range from 3.5 to -20.5¿ and from 16.1 to 28.7¿, respectively, indicative of different carbon sources and host-rock types. Carbonates associated with sulfide mineralization depict δ13C/δ18O assemblages and 87Sr/86Sr ratios (0.70801-0.71202) resulting from the interaction of a basinal brine with the different host rocks. Galena Pb isotope ratios¿206Pb/204Pb from 18.643 to 18.696, 207Pb/204Pb from 15.650 to 15.676, and 208Pb/204Pb from 38.720 to 38.780¿point to metal source rocks similar to other Mississippi Valley-type (MVT) deposits of the Basque-Cantabrian basin. Sulfide concentrations around the Murguía and Orduña diapirs are not concomitant with caprock formation but with dolomitization, as in MVT deposits. This is in contrast with the diapir-related deposits of the Gulf Coast and shares characteristics with the diapir-related mineralization in North Africa.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/162496
url https://hdl.handle.net/2445/162496
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.5382/econgeo.2018.4584
Economic Geology, 2018, vol. 113, num. 5, p. 1133-1159
https://doi.org/10.5382/econgeo.2018.4584
dc.rights.none.fl_str_mv (c) Society of Economic Geologists, 2018
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Society of Economic Geologists, 2018
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Society of Economic Geologists
publisher.none.fl_str_mv Society of Economic Geologists
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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