Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal

Detalhes bibliográficos
Autor(a) principal: Neiva, A. M. R.
Data de Publicação: 2008
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/3927
https://doi.org/10.1016/j.oregeorev.2008.07.002
Resumo: Cassiterite and wolframite compositions from Sn > W- and W > Sn-bearing quartz veins in Northern and Central Portugal are compared to provide evidence on fluid compositions. In Sn > W-bearing quartz veins, euhedral cassiterite shows sequences of alternating parallel darker and lighter zones. The darker zones are pleochroic, oscillatory zoned, exhibit exsolutions of columbite and ixiolite and are richer in Nb, Ta and Fe than the lighter zones which consist of nearly pure SnO2. Cassiterite from W > Sn-bearing quartz veins is usually zoned, with homogeneous and slightly pleochroic darker zones, which are chemically similar to lighter zones. Both zones have inclusions of rutile and rare ilmenite. The darker zones of cassiterite from the former veins are richer in Nb, Ta and Fe contents and poorer in Ti than the darker and lighter zones of cassiterite from the latter veins. This is attributed to differences in the composition of magmatic hydrothermal fluids.
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spelling Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in PortugalCassiteriteColumbiteIxioliteWolframitePortugalOre-forming fluidsCassiterite and wolframite compositions from Sn > W- and W > Sn-bearing quartz veins in Northern and Central Portugal are compared to provide evidence on fluid compositions. In Sn > W-bearing quartz veins, euhedral cassiterite shows sequences of alternating parallel darker and lighter zones. The darker zones are pleochroic, oscillatory zoned, exhibit exsolutions of columbite and ixiolite and are richer in Nb, Ta and Fe than the lighter zones which consist of nearly pure SnO2. Cassiterite from W > Sn-bearing quartz veins is usually zoned, with homogeneous and slightly pleochroic darker zones, which are chemically similar to lighter zones. Both zones have inclusions of rutile and rare ilmenite. The darker zones of cassiterite from the former veins are richer in Nb, Ta and Fe contents and poorer in Ti than the darker and lighter zones of cassiterite from the latter veins. This is attributed to differences in the composition of magmatic hydrothermal fluids.http://www.sciencedirect.com/science/article/B6V90-4PTMXMG-1/1/e922fe6d2d51481adff0c1b69e60236b2008info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/3927http://hdl.handle.net/10316/3927https://doi.org/10.1016/j.oregeorev.2008.07.002engOre Geology Reviews. 33:3-4 (2008) 221-238Neiva, A. M. R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:48:31Zoai:estudogeral.uc.pt:10316/3927Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:55:07.910378Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
title Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
spellingShingle Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
Neiva, A. M. R.
Cassiterite
Columbite
Ixiolite
Wolframite
Portugal
Ore-forming fluids
title_short Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
title_full Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
title_fullStr Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
title_full_unstemmed Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
title_sort Geochemistry of cassiterite and wolframite from tin and tungsten quartz veins in Portugal
author Neiva, A. M. R.
author_facet Neiva, A. M. R.
author_role author
dc.contributor.author.fl_str_mv Neiva, A. M. R.
dc.subject.por.fl_str_mv Cassiterite
Columbite
Ixiolite
Wolframite
Portugal
Ore-forming fluids
topic Cassiterite
Columbite
Ixiolite
Wolframite
Portugal
Ore-forming fluids
description Cassiterite and wolframite compositions from Sn > W- and W > Sn-bearing quartz veins in Northern and Central Portugal are compared to provide evidence on fluid compositions. In Sn > W-bearing quartz veins, euhedral cassiterite shows sequences of alternating parallel darker and lighter zones. The darker zones are pleochroic, oscillatory zoned, exhibit exsolutions of columbite and ixiolite and are richer in Nb, Ta and Fe than the lighter zones which consist of nearly pure SnO2. Cassiterite from W > Sn-bearing quartz veins is usually zoned, with homogeneous and slightly pleochroic darker zones, which are chemically similar to lighter zones. Both zones have inclusions of rutile and rare ilmenite. The darker zones of cassiterite from the former veins are richer in Nb, Ta and Fe contents and poorer in Ti than the darker and lighter zones of cassiterite from the latter veins. This is attributed to differences in the composition of magmatic hydrothermal fluids.
publishDate 2008
dc.date.none.fl_str_mv 2008
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/3927
http://hdl.handle.net/10316/3927
https://doi.org/10.1016/j.oregeorev.2008.07.002
url http://hdl.handle.net/10316/3927
https://doi.org/10.1016/j.oregeorev.2008.07.002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Ore Geology Reviews. 33:3-4 (2008) 221-238
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eu_rights_str_mv openAccess
dc.format.none.fl_str_mv aplication/PDF
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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