Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
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=S2317-48892021000400303 |
Resumo: | Abstract Presented here are the results of the first studies of silicate melt inclusions hosted in quartz crystals from the two late granitic facies of the Paleoproterozoic Madeira pluton in the Pitinga mine, State of Amazonas, Brazil. The study of these magmatic inclusions in the anorogenic granites of Pitinga furnished reliable results because the original composition of the trapped silicate liquids is well preserved. Petrographic, morphological, and chemical data show that both porphyritic hypersolvus alkali feldspar granite and albite-rich granite were formed by melt-melt immiscibility from a precursor magma. After phase separation, albite-rich granite evolution was characterized by strong enrichment in F, Na, Sn, Nb, Ta, Zr, Th, Y, Rb, and REE compared to the porphyritic granite, based on data obtained from analyses of both trace elements by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and major elements by electron microprobe. These elements make up the polymetallic magmatic ore of the Pitinga mine. The contrasting evolutionary trends, peralkaline and peraluminous, stand out in the different geochemical signatures of the analyzed melt inclusions. The preliminary results of our studies on melt inclusions trapped in rare metal granite minerals from Sn-polymetallic deposits in Brazil suggest abundant possibilities for using this methodology in future petrological and metallogenic research. |
id |
SBGEO-1_aefb82fecc618a71589bb79f5f1392b8 |
---|---|
oai_identifier_str |
oai:scielo:S2317-48892021000400303 |
network_acronym_str |
SBGEO-1 |
network_name_str |
Brazilian Journal of Geology |
repository_id_str |
|
spelling |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion studymelt inclusionsmelt-melt immiscibilityLA-ICP-MSelectron microprobeperalkaline albite-rich granitePitinga mineAbstract Presented here are the results of the first studies of silicate melt inclusions hosted in quartz crystals from the two late granitic facies of the Paleoproterozoic Madeira pluton in the Pitinga mine, State of Amazonas, Brazil. The study of these magmatic inclusions in the anorogenic granites of Pitinga furnished reliable results because the original composition of the trapped silicate liquids is well preserved. Petrographic, morphological, and chemical data show that both porphyritic hypersolvus alkali feldspar granite and albite-rich granite were formed by melt-melt immiscibility from a precursor magma. After phase separation, albite-rich granite evolution was characterized by strong enrichment in F, Na, Sn, Nb, Ta, Zr, Th, Y, Rb, and REE compared to the porphyritic granite, based on data obtained from analyses of both trace elements by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and major elements by electron microprobe. These elements make up the polymetallic magmatic ore of the Pitinga mine. The contrasting evolutionary trends, peralkaline and peraluminous, stand out in the different geochemical signatures of the analyzed melt inclusions. The preliminary results of our studies on melt inclusions trapped in rare metal granite minerals from Sn-polymetallic deposits in Brazil suggest abundant possibilities for using this methodology in future petrological and metallogenic research.Sociedade Brasileira de Geologia2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000400303Brazilian Journal of Geology v.51 n.4 2021reponame:Brazilian Journal of Geologyinstname:Sociedade Brasileira de Geologia (SBGEO)instacron:SBGEO10.1590/2317-4889202120210011info:eu-repo/semantics/openAccessBorges,Régis Munhoz KrásAmorim,Lucas Eustáquio DiasRios,Francisco JavierSantos,Gabrielle Cristine Silva dosFreitas,Monica ElizettiLima,Tatiana Aparecida Fernandes deSantos,ArmindoPedrosa,Tércio Assunçãoeng2021-12-21T00:00:00Zoai:scielo:S2317-48892021000400303Revistahttp://bjg.siteoficial.ws/index.htmhttps://old.scielo.br/oai/scielo-oai.phpsbgsede@sbgeo.org.br||claudio.riccomini@gmail.com2317-46922317-4692opendoar:2021-12-21T00:00Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)false |
dc.title.none.fl_str_mv |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
title |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
spellingShingle |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study Borges,Régis Munhoz Krás melt inclusions melt-melt immiscibility LA-ICP-MS electron microprobe peralkaline albite-rich granite Pitinga mine |
title_short |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
title_full |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
title_fullStr |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
title_full_unstemmed |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
title_sort |
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study |
author |
Borges,Régis Munhoz Krás |
author_facet |
Borges,Régis Munhoz Krás Amorim,Lucas Eustáquio Dias Rios,Francisco Javier Santos,Gabrielle Cristine Silva dos Freitas,Monica Elizetti Lima,Tatiana Aparecida Fernandes de Santos,Armindo Pedrosa,Tércio Assunção |
author_role |
author |
author2 |
Amorim,Lucas Eustáquio Dias Rios,Francisco Javier Santos,Gabrielle Cristine Silva dos Freitas,Monica Elizetti Lima,Tatiana Aparecida Fernandes de Santos,Armindo Pedrosa,Tércio Assunção |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Borges,Régis Munhoz Krás Amorim,Lucas Eustáquio Dias Rios,Francisco Javier Santos,Gabrielle Cristine Silva dos Freitas,Monica Elizetti Lima,Tatiana Aparecida Fernandes de Santos,Armindo Pedrosa,Tércio Assunção |
dc.subject.por.fl_str_mv |
melt inclusions melt-melt immiscibility LA-ICP-MS electron microprobe peralkaline albite-rich granite Pitinga mine |
topic |
melt inclusions melt-melt immiscibility LA-ICP-MS electron microprobe peralkaline albite-rich granite Pitinga mine |
description |
Abstract Presented here are the results of the first studies of silicate melt inclusions hosted in quartz crystals from the two late granitic facies of the Paleoproterozoic Madeira pluton in the Pitinga mine, State of Amazonas, Brazil. The study of these magmatic inclusions in the anorogenic granites of Pitinga furnished reliable results because the original composition of the trapped silicate liquids is well preserved. Petrographic, morphological, and chemical data show that both porphyritic hypersolvus alkali feldspar granite and albite-rich granite were formed by melt-melt immiscibility from a precursor magma. After phase separation, albite-rich granite evolution was characterized by strong enrichment in F, Na, Sn, Nb, Ta, Zr, Th, Y, Rb, and REE compared to the porphyritic granite, based on data obtained from analyses of both trace elements by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and major elements by electron microprobe. These elements make up the polymetallic magmatic ore of the Pitinga mine. The contrasting evolutionary trends, peralkaline and peraluminous, stand out in the different geochemical signatures of the analyzed melt inclusions. The preliminary results of our studies on melt inclusions trapped in rare metal granite minerals from Sn-polymetallic deposits in Brazil suggest abundant possibilities for using this methodology in future petrological and metallogenic research. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-01 |
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=S2317-48892021000400303 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000400303 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2317-4889202120210011 |
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.51 n.4 2021 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_ |
1752122399477727232 |