Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent.
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/13211 https://doi.org/10.1016/j.gsf.2020.02.007 |
Resumo: | Petrological characterization, U–Pb geochronology, Lu–Hf analyses and major and trace element data from mafic intrusions in the Central Espinhaço (central portion of the Brazilian shield) are used here to investigate the geological significance of the Early Neoproterozoic magmatism in the context of the S~ao Francisco-Congo paleocontinent. These mafic bodies are represented by medium to coarse-grained metagabbros with plagioclase, amphibole and clinopyroxene. Zircon U–Pb isotopic data from two samples yielded weighted mean 206Pb/238U ages of 895 3.4 Ma (MSWD ¼ 1.7) and 896 2.4 Ma (MSWD ¼ 0.64), regarded as the best estimates for the crystallization age of these mafic rocks. Major and trace element data (including REEs) show that the gabbros originated from a subalkaline tholeiitic magma, typical of intraplate magmatism. Such rocks are slightly enriched in LREEs and LILEs and depleted in HFSEs. Our new isotope and geochemical data, along with regional knowledge, indicate that these metagabbros mark the beginning of an important Tonian-age extensional tectonic event of the landmass of which the S~ao Francisco-Congo paleocontinent was part (Rodinia supercontinent or Central African block?). We furthermore suggest that these rocks belong to a prominent suite of Tonian-age mafic rocks that mark a diachronic breakup attempt of this landmass which may have occurred from south to north along the Espinhaço mountain range. |
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Moreira, Helen FonsecaDanderfer Filho, AndréCosta, Alice Fernanda de OliveiraBersan, Samuel MoreiraLana, Cristiano de CarvalhoQueiroga, Gláucia Nascimento2021-04-23T13:56:44Z2021-04-23T13:56:44Z2020MOREIRA, H. F. et al. Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil): new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. Geoscience Frontiers, v. 11, n. 6, p. 2323-2337, nov. 2020. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1674987120300499>. Acesso em: 19 fev. 2021.1674-9871http://www.repositorio.ufop.br/handle/123456789/13211https://doi.org/10.1016/j.gsf.2020.02.007Petrological characterization, U–Pb geochronology, Lu–Hf analyses and major and trace element data from mafic intrusions in the Central Espinhaço (central portion of the Brazilian shield) are used here to investigate the geological significance of the Early Neoproterozoic magmatism in the context of the S~ao Francisco-Congo paleocontinent. These mafic bodies are represented by medium to coarse-grained metagabbros with plagioclase, amphibole and clinopyroxene. Zircon U–Pb isotopic data from two samples yielded weighted mean 206Pb/238U ages of 895 3.4 Ma (MSWD ¼ 1.7) and 896 2.4 Ma (MSWD ¼ 0.64), regarded as the best estimates for the crystallization age of these mafic rocks. Major and trace element data (including REEs) show that the gabbros originated from a subalkaline tholeiitic magma, typical of intraplate magmatism. Such rocks are slightly enriched in LREEs and LILEs and depleted in HFSEs. Our new isotope and geochemical data, along with regional knowledge, indicate that these metagabbros mark the beginning of an important Tonian-age extensional tectonic event of the landmass of which the S~ao Francisco-Congo paleocontinent was part (Rodinia supercontinent or Central African block?). We furthermore suggest that these rocks belong to a prominent suite of Tonian-age mafic rocks that mark a diachronic breakup attempt of this landmass which may have occurred from south to north along the Espinhaço mountain range.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Fonte: o próprio artigo.info:eu-repo/semantics/openAccessMafic rocksEspinhaço basinTonian riftingU–Pb geochronologyRecord of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleporreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-8924http://www.repositorio.ufop.br/bitstream/123456789/13211/2/license.txt62604f8d955274beb56c80ce1ee5dcaeMD52ORIGINALARTIGO_RecordEarlyTonian.pdfARTIGO_RecordEarlyTonian.pdfapplication/pdf6270018http://www.repositorio.ufop.br/bitstream/123456789/13211/1/ARTIGO_RecordEarlyTonian.pdf84f7306b1aeb7440228f7be593f38dd3MD51123456789/132112021-04-23 09:56:44.835oai:localhost: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ório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332021-04-23T13:56:44Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
title |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
spellingShingle |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. Moreira, Helen Fonseca Mafic rocks Espinhaço basin Tonian rifting U–Pb geochronology |
title_short |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
title_full |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
title_fullStr |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
title_full_unstemmed |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
title_sort |
Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil) : new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. |
author |
Moreira, Helen Fonseca |
author_facet |
Moreira, Helen Fonseca Danderfer Filho, André Costa, Alice Fernanda de Oliveira Bersan, Samuel Moreira Lana, Cristiano de Carvalho Queiroga, Gláucia Nascimento |
author_role |
author |
author2 |
Danderfer Filho, André Costa, Alice Fernanda de Oliveira Bersan, Samuel Moreira Lana, Cristiano de Carvalho Queiroga, Gláucia Nascimento |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Moreira, Helen Fonseca Danderfer Filho, André Costa, Alice Fernanda de Oliveira Bersan, Samuel Moreira Lana, Cristiano de Carvalho Queiroga, Gláucia Nascimento |
dc.subject.por.fl_str_mv |
Mafic rocks Espinhaço basin Tonian rifting U–Pb geochronology |
topic |
Mafic rocks Espinhaço basin Tonian rifting U–Pb geochronology |
description |
Petrological characterization, U–Pb geochronology, Lu–Hf analyses and major and trace element data from mafic intrusions in the Central Espinhaço (central portion of the Brazilian shield) are used here to investigate the geological significance of the Early Neoproterozoic magmatism in the context of the S~ao Francisco-Congo paleocontinent. These mafic bodies are represented by medium to coarse-grained metagabbros with plagioclase, amphibole and clinopyroxene. Zircon U–Pb isotopic data from two samples yielded weighted mean 206Pb/238U ages of 895 3.4 Ma (MSWD ¼ 1.7) and 896 2.4 Ma (MSWD ¼ 0.64), regarded as the best estimates for the crystallization age of these mafic rocks. Major and trace element data (including REEs) show that the gabbros originated from a subalkaline tholeiitic magma, typical of intraplate magmatism. Such rocks are slightly enriched in LREEs and LILEs and depleted in HFSEs. Our new isotope and geochemical data, along with regional knowledge, indicate that these metagabbros mark the beginning of an important Tonian-age extensional tectonic event of the landmass of which the S~ao Francisco-Congo paleocontinent was part (Rodinia supercontinent or Central African block?). We furthermore suggest that these rocks belong to a prominent suite of Tonian-age mafic rocks that mark a diachronic breakup attempt of this landmass which may have occurred from south to north along the Espinhaço mountain range. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2021-04-23T13:56:44Z |
dc.date.available.fl_str_mv |
2021-04-23T13:56:44Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MOREIRA, H. F. et al. Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil): new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. Geoscience Frontiers, v. 11, n. 6, p. 2323-2337, nov. 2020. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1674987120300499>. Acesso em: 19 fev. 2021. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/handle/123456789/13211 |
dc.identifier.issn.none.fl_str_mv |
1674-9871 |
dc.identifier.doi.pt_BR.fl_str_mv |
https://doi.org/10.1016/j.gsf.2020.02.007 |
identifier_str_mv |
MOREIRA, H. F. et al. Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil): new insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent. Geoscience Frontiers, v. 11, n. 6, p. 2323-2337, nov. 2020. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1674987120300499>. Acesso em: 19 fev. 2021. 1674-9871 |
url |
http://www.repositorio.ufop.br/handle/123456789/13211 https://doi.org/10.1016/j.gsf.2020.02.007 |
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