In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)

Organic matter is thought to play a role in the genesis of many Mississippi Valley-type (MVT) deposits, actino as a reducing agent during thermochemical sulfate reduction (TSR). Although TSR is an extremely slow reaction t low temperatures (lt;100ºC), under favorable conditions it may supply the nec...

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Autores: Piqué i Vericat, Àngels, Canals i Sabaté, Àngels, Disnar, J. R., Grandia i Borràs, Fidel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/16887
Acceso en línea:https://hdl.handle.net/2445/16887
Access Level:acceso abierto
Palabra clave:Geoquímica
Conques sedimentàries
Serralada Cantàbrica
Geochemistry
Sedimentary basins
Cantabrian Mountains
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spelling In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)Piqué i Vericat, ÀngelsCanals i Sabaté, ÀngelsDisnar, J. R.Grandia i Borràs, FidelGeoquímicaConques sedimentàriesSerralada CantàbricaGeochemistrySedimentary basinsCantabrian MountainsOrganic matter is thought to play a role in the genesis of many Mississippi Valley-type (MVT) deposits, actino as a reducing agent during thermochemical sulfate reduction (TSR). Although TSR is an extremely slow reaction t low temperatures (lt;100ºC), under favorable conditions it may supply the necessary reduced sulfur during ore formation. To test this hypothesis, the Itxaspe Zn-(Pb) MVT occurrence in the Basque-Cantabrian basin (Northern Spain) was studied. Sphalerite, the main ore phase, is generally found disseminated in Urgonian (Lower Cretaceous) carbonates, and in close relationship with solid bitumen. The bitumen source rock was very likely deposited in a marine marginal setting. Differences in composition of the bitumen samples are attributed to a fractionation during hydrocarbon expulsion and/or migration. The fluids involved in ore deposition were low temperature (Th ~130ºC), Na-Ca-Cl-(K-Mg)-type brines (salinities ~12.5 equiv. mass % NaCl). The origin of brine solutes (including sulfate) is related to the dissolution of Mesozoic evaporite units, although the contribution of evaporated seawater brines cannot be ruled out. The temperatures of ore deposition, the close relationship between the bitumen and ore phases, the presence of aromatic sulfur-bearing compounds and the d34S of sulfides and sulfates are consistent with an in situ TSR during ore formation in the Itxaspe Zn-(Pb) occurrence. Therefore, at least for small mineralizations like Itxaspe, our conclusion is that the necessary reduced sulfur can be supplied by TSR during ore genesis at the site of metal deposition.Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)201120112009info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/2445/16887Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a http://dx.doi.org/10.1344/105.000001448Geologica Acta, 2009, vol. 7, núm. 4, p. 431-449http://dx.doi.org/10.1344/105.000001448cc by-sa (c) Piqué et al., 2009http://creativecommons.org/licenses/by-sa/3.0/es/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/168872026-05-29T05:05:01Z
dc.title.none.fl_str_mv In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
title In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
spellingShingle In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
Piqué i Vericat, Àngels
Geoquímica
Conques sedimentàries
Serralada Cantàbrica
Geochemistry
Sedimentary basins
Cantabrian Mountains
title_short In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
title_full In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
title_fullStr In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
title_full_unstemmed In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
title_sort In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque Cantabrian Basin, Northern Spain)
dc.creator.none.fl_str_mv Piqué i Vericat, Àngels
Canals i Sabaté, Àngels
Disnar, J. R.
Grandia i Borràs, Fidel
author Piqué i Vericat, Àngels
author_facet Piqué i Vericat, Àngels
Canals i Sabaté, Àngels
Disnar, J. R.
Grandia i Borràs, Fidel
author_role author
author2 Canals i Sabaté, Àngels
Disnar, J. R.
Grandia i Borràs, Fidel
author2_role author
author
author
dc.subject.none.fl_str_mv Geoquímica
Conques sedimentàries
Serralada Cantàbrica
Geochemistry
Sedimentary basins
Cantabrian Mountains
topic Geoquímica
Conques sedimentàries
Serralada Cantàbrica
Geochemistry
Sedimentary basins
Cantabrian Mountains
description Organic matter is thought to play a role in the genesis of many Mississippi Valley-type (MVT) deposits, actino as a reducing agent during thermochemical sulfate reduction (TSR). Although TSR is an extremely slow reaction t low temperatures (lt;100ºC), under favorable conditions it may supply the necessary reduced sulfur during ore formation. To test this hypothesis, the Itxaspe Zn-(Pb) MVT occurrence in the Basque-Cantabrian basin (Northern Spain) was studied. Sphalerite, the main ore phase, is generally found disseminated in Urgonian (Lower Cretaceous) carbonates, and in close relationship with solid bitumen. The bitumen source rock was very likely deposited in a marine marginal setting. Differences in composition of the bitumen samples are attributed to a fractionation during hydrocarbon expulsion and/or migration. The fluids involved in ore deposition were low temperature (Th ~130ºC), Na-Ca-Cl-(K-Mg)-type brines (salinities ~12.5 equiv. mass % NaCl). The origin of brine solutes (including sulfate) is related to the dissolution of Mesozoic evaporite units, although the contribution of evaporated seawater brines cannot be ruled out. The temperatures of ore deposition, the close relationship between the bitumen and ore phases, the presence of aromatic sulfur-bearing compounds and the d34S of sulfides and sulfates are consistent with an in situ TSR during ore formation in the Itxaspe Zn-(Pb) occurrence. Therefore, at least for small mineralizations like Itxaspe, our conclusion is that the necessary reduced sulfur can be supplied by TSR during ore genesis at the site of metal deposition.
publishDate 2009
dc.date.none.fl_str_mv 2009
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/16887
url https://hdl.handle.net/2445/16887
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a http://dx.doi.org/10.1344/105.000001448
Geologica Acta, 2009, vol. 7, núm. 4, p. 431-449
http://dx.doi.org/10.1344/105.000001448
dc.rights.none.fl_str_mv cc by-sa (c) Piqué et al., 2009
http://creativecommons.org/licenses/by-sa/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc by-sa (c) Piqué et al., 2009
http://creativecommons.org/licenses/by-sa/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
publisher.none.fl_str_mv Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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