Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Geology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000400301 |
Resumo: | Abstract Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil. Intrinsic parameters based on the mineral chemistry of plagioclase, biotite, amphibole, and pyroxene constrain crystallization conditions to 1150–850°C and 750–600 MPa, moderate water content in the melt (4.8–5.6 wt.%) and relatively oxidizing conditions, between the fayalite–magnetite–quartz (FMQ) and nickel– nickel oxide (NNO) + 1.7 buffers. Geochemical modeling indicates that the Café enderbite evolved via at least two fractional crystallization stages – quartz diorite to orthopyroxene tonalite and orthopyroxene tonalite to orthopyroxene trondhjemite – with high crystal content (45–60%, or even higher). This high crystal content during fractional crystallization was the key factor to the preservation of orthopyroxene in the magmatic system as it left only a relatively small proportion of melt to react with early-formed orthopyroxene. |
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Brazilian Journal of Geology |
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Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazilcharnockitecrystallization conditionsgeochemical modelingCafé EnderbiteCarajás ProvinceAbstract Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil. Intrinsic parameters based on the mineral chemistry of plagioclase, biotite, amphibole, and pyroxene constrain crystallization conditions to 1150–850°C and 750–600 MPa, moderate water content in the melt (4.8–5.6 wt.%) and relatively oxidizing conditions, between the fayalite–magnetite–quartz (FMQ) and nickel– nickel oxide (NNO) + 1.7 buffers. Geochemical modeling indicates that the Café enderbite evolved via at least two fractional crystallization stages – quartz diorite to orthopyroxene tonalite and orthopyroxene tonalite to orthopyroxene trondhjemite – with high crystal content (45–60%, or even higher). This high crystal content during fractional crystallization was the key factor to the preservation of orthopyroxene in the magmatic system as it left only a relatively small proportion of melt to react with early-formed orthopyroxene.Sociedade Brasileira de Geologia2022-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000400301Brazilian Journal of Geology v.52 n.4 2022reponame:Brazilian Journal of Geologyinstname:Sociedade Brasileira de Geologia (SBGEO)instacron:SBGEO10.1590/2317-4889202220210092info:eu-repo/semantics/openAccessMarangoanha,BhrennoOliveira,Davis Carvalho deLamarão,Cláudio NeryMarques,Gisele TavaresSilva,Luciano Ribeiro daeng2022-10-04T00:00:00Zoai:scielo:S2317-48892022000400301Revistahttp://bjg.siteoficial.ws/index.htmhttps://old.scielo.br/oai/scielo-oai.phpsbgsede@sbgeo.org.br||claudio.riccomini@gmail.com2317-46922317-4692opendoar:2022-10-04T00:00Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)false |
dc.title.none.fl_str_mv |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
title |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
spellingShingle |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil Marangoanha,Bhrenno charnockite crystallization conditions geochemical modeling Café Enderbite Carajás Province |
title_short |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
title_full |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
title_fullStr |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
title_full_unstemmed |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
title_sort |
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil |
author |
Marangoanha,Bhrenno |
author_facet |
Marangoanha,Bhrenno Oliveira,Davis Carvalho de Lamarão,Cláudio Nery Marques,Gisele Tavares Silva,Luciano Ribeiro da |
author_role |
author |
author2 |
Oliveira,Davis Carvalho de Lamarão,Cláudio Nery Marques,Gisele Tavares Silva,Luciano Ribeiro da |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Marangoanha,Bhrenno Oliveira,Davis Carvalho de Lamarão,Cláudio Nery Marques,Gisele Tavares Silva,Luciano Ribeiro da |
dc.subject.por.fl_str_mv |
charnockite crystallization conditions geochemical modeling Café Enderbite Carajás Province |
topic |
charnockite crystallization conditions geochemical modeling Café Enderbite Carajás Province |
description |
Abstract Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil. Intrinsic parameters based on the mineral chemistry of plagioclase, biotite, amphibole, and pyroxene constrain crystallization conditions to 1150–850°C and 750–600 MPa, moderate water content in the melt (4.8–5.6 wt.%) and relatively oxidizing conditions, between the fayalite–magnetite–quartz (FMQ) and nickel– nickel oxide (NNO) + 1.7 buffers. Geochemical modeling indicates that the Café enderbite evolved via at least two fractional crystallization stages – quartz diorite to orthopyroxene tonalite and orthopyroxene tonalite to orthopyroxene trondhjemite – with high crystal content (45–60%, or even higher). This high crystal content during fractional crystallization was the key factor to the preservation of orthopyroxene in the magmatic system as it left only a relatively small proportion of melt to react with early-formed orthopyroxene. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000400301 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000400301 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2317-4889202220210092 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Geology v.52 n.4 2022 reponame:Brazilian Journal of Geology instname:Sociedade Brasileira de Geologia (SBGEO) instacron:SBGEO |
instname_str |
Sociedade Brasileira de Geologia (SBGEO) |
instacron_str |
SBGEO |
institution |
SBGEO |
reponame_str |
Brazilian Journal of Geology |
collection |
Brazilian Journal of Geology |
repository.name.fl_str_mv |
Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO) |
repository.mail.fl_str_mv |
sbgsede@sbgeo.org.br||claudio.riccomini@gmail.com |
_version_ |
1752122399599362048 |