Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)

The Campo Formoso stratiform intrusive complex, in Bahia State, Brazil, considered to be of Paleoproterozoic age, consists of a tabular body of ultramafic rocks about 40 km long and 100-1100 m wide. Thick horizons of chromitite are exploited and the deposits are the richest in Brazil. The complex wa...

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Authors: Zaccarini, F., Garuti, G., Martin, R. F.
Format: article
Publication Date:2006
Country:España
Institution:Universitat Autònoma de Barcelona
Repository:Dipòsit Digital de Documents de la UAB
Language:English
OAI Identifier:oai:ddd.uab.cat:86001
Online Access:https://ddd.uab.cat/record/86001
https://dx.doi.org/urn:doi:10.1344/105.000000347
Access Level:Open access
Keyword:Campo Formoso
Chromitites
Monazite
Apatite
Pb-S-Sb bearing minerals
Brazil
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spelling Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)Zaccarini, F.Garuti, G.Martin, R. F.Campo FormosoChromititesMonaziteApatitePb-S-Sb bearing mineralsBrazilThe Campo Formoso stratiform intrusive complex, in Bahia State, Brazil, considered to be of Paleoproterozoic age, consists of a tabular body of ultramafic rocks about 40 km long and 100-1100 m wide. Thick horizons of chromitite are exploited and the deposits are the richest in Brazil. The complex was intruded by the Campo Formoso calc-alkaline batholith, emplaced by the result of the Transamazonian collision-related orogeny. The peridotite was firstly thoroughly serpentinized, then affected by a renewed cycle of hydrothermal alteration as the batholith cooled, leading in the roof zone to emerald mineralization around roof pendants. An even later influx of fluid led to the formation of talc, silica and carbonates, such that the ultramafic rocks were locally converted to listwanite. The chromitite sequences are highly unusual in containing rather exotic minerals, such as monazite-(La), monazite-(Ce), apatite, galena, bismuthinite, antimony, and three unknown minerals of stoichiometry PbSb2, Pb Sb and PbSb4, all associated with the clinochlore. The latter phases may have formed during hydrothermal activity in the system Pb-Sb. The presence of these exotic minerals in chromitite, which makes this occurrence unique in the world, strongly support the hypothesis that the La, Ce, P, Pb, Bi and Sb were metasomatically added to the Campo Formoso chromitite horizons by hydrothermal fluids emanating from the nearby Campo Formoso calc-alkaline batholith as it cooled.Instituto Andaluz de Ciencias de la Tierra 22006-01-0120062006-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/86001https://dx.doi.org/urn:doi:10.1344/105.000000347reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:860012026-06-06T12:50:31Z
dc.title.none.fl_str_mv Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
title Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
spellingShingle Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
Zaccarini, F.
Campo Formoso
Chromitites
Monazite
Apatite
Pb-S-Sb bearing minerals
Brazil
title_short Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
title_full Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
title_fullStr Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
title_full_unstemmed Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
title_sort Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil)
dc.creator.none.fl_str_mv Zaccarini, F.
Garuti, G.
Martin, R. F.
author Zaccarini, F.
author_facet Zaccarini, F.
Garuti, G.
Martin, R. F.
author_role author
author2 Garuti, G.
Martin, R. F.
author2_role author
author
dc.contributor.none.fl_str_mv Instituto Andaluz de Ciencias de la Tierra
dc.subject.none.fl_str_mv Campo Formoso
Chromitites
Monazite
Apatite
Pb-S-Sb bearing minerals
Brazil
topic Campo Formoso
Chromitites
Monazite
Apatite
Pb-S-Sb bearing minerals
Brazil
description The Campo Formoso stratiform intrusive complex, in Bahia State, Brazil, considered to be of Paleoproterozoic age, consists of a tabular body of ultramafic rocks about 40 km long and 100-1100 m wide. Thick horizons of chromitite are exploited and the deposits are the richest in Brazil. The complex was intruded by the Campo Formoso calc-alkaline batholith, emplaced by the result of the Transamazonian collision-related orogeny. The peridotite was firstly thoroughly serpentinized, then affected by a renewed cycle of hydrothermal alteration as the batholith cooled, leading in the roof zone to emerald mineralization around roof pendants. An even later influx of fluid led to the formation of talc, silica and carbonates, such that the ultramafic rocks were locally converted to listwanite. The chromitite sequences are highly unusual in containing rather exotic minerals, such as monazite-(La), monazite-(Ce), apatite, galena, bismuthinite, antimony, and three unknown minerals of stoichiometry PbSb2, Pb Sb and PbSb4, all associated with the clinochlore. The latter phases may have formed during hydrothermal activity in the system Pb-Sb. The presence of these exotic minerals in chromitite, which makes this occurrence unique in the world, strongly support the hypothesis that the La, Ce, P, Pb, Bi and Sb were metasomatically added to the Campo Formoso chromitite horizons by hydrothermal fluids emanating from the nearby Campo Formoso calc-alkaline batholith as it cooled.
publishDate 2006
dc.date.none.fl_str_mv 2
2006-01-01
2006
2006-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/86001
https://dx.doi.org/urn:doi:10.1344/105.000000347
url https://ddd.uab.cat/record/86001
https://dx.doi.org/urn:doi:10.1344/105.000000347
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
https://creativecommons.org/licenses/by-sa/3.0/
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
https://creativecommons.org/licenses/by-sa/3.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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