The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional de Geociências - RIGEO |
Texto Completo: | https://rigeo.cprm.gov.br/handle/doc/21509 |
Resumo: | The Nova Monte Verde metamorphic core complex is an arched structure located in the southern portion of the Rio Negro-Juruena geochronological Province and is part of a belt of metamorphic rocks containing gneiss and migmatite domes exhumed during Statherian extension of rifted Ventuari-Tapajós crust. This metamorphic core is bordered, both to the north and south, by felsic volcanic and plutonic rocks intensely foliated near the metamorphic core and becoming progressively undeformed as one moves away from the metamorphic core. U-Pb analyses of zircon and monazite from migmatites exposed in the core of the complex, coupled with a detailed structural analysis, enlighten the timing and duration of migmatite crystallization, indicating that crystallization, extensional deformation and exhumation of the core-complex were coeval. Analysis of a high melt fraction from migmatites outcroping near Bacaeri Farm suggest that the Nova Monte Verde metamorphic core complex records a history of neosome formation spanning at least 37 Ma, as indicated by 206Pb/238U ages (1800-1763Ma) for new zircon growth attributed to migmatization. Monazite from two samples yielded U-Pb ages of 1798 ± 29 Ma for the aluminous metatexite and 1754 ± 11 Ma for sillimanite-biotite metatexite. The former is interpreted as the metamorphic peak and main generation of leucosomes, and the latter as the second phase of partial melting or as an alternative, the timing of cooling and exhumation of metamorphic core complex. Crystallization of the Nova Monte Verde migmatites was therefore coeval in part with upper crustal extension and ductile flow of the mid-crust, suggesting that crustal anatexis was widespread over much of the mid-crust during Statherian time (∼1800-1760Ma). Therefore, the tectonic history of the Nova Monte Verde core complex involved regional extension and exhumation of high-grade metamorphic rocks by transtensional tectonics. The following results are at least more compatible with, if not suggestive of, a continental rift setting than the traditionally accepted continental arc setting. |
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RIZZOTTO, Gilmar JoséALVES, Cleber LadeiraRIOS, Francisco SeneBARROS, Marcia Aparecida de Sant’Ana2019-12-20T15:11:31Z2019-12-20T15:11:31Z2019RIZZOTTO, Gilmar Jose; ALVES, Cleber Ladeira; RIOS, Francisco Sene; BARROS, Marcia Aparecida de Sant’Ana. The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian craton. Journal of South American Earth Sciences, n. 91, p. 154-172, 2019.https://rigeo.cprm.gov.br/handle/doc/21509The Nova Monte Verde metamorphic core complex is an arched structure located in the southern portion of the Rio Negro-Juruena geochronological Province and is part of a belt of metamorphic rocks containing gneiss and migmatite domes exhumed during Statherian extension of rifted Ventuari-Tapajós crust. This metamorphic core is bordered, both to the north and south, by felsic volcanic and plutonic rocks intensely foliated near the metamorphic core and becoming progressively undeformed as one moves away from the metamorphic core. U-Pb analyses of zircon and monazite from migmatites exposed in the core of the complex, coupled with a detailed structural analysis, enlighten the timing and duration of migmatite crystallization, indicating that crystallization, extensional deformation and exhumation of the core-complex were coeval. Analysis of a high melt fraction from migmatites outcroping near Bacaeri Farm suggest that the Nova Monte Verde metamorphic core complex records a history of neosome formation spanning at least 37 Ma, as indicated by 206Pb/238U ages (1800-1763Ma) for new zircon growth attributed to migmatization. Monazite from two samples yielded U-Pb ages of 1798 ± 29 Ma for the aluminous metatexite and 1754 ± 11 Ma for sillimanite-biotite metatexite. The former is interpreted as the metamorphic peak and main generation of leucosomes, and the latter as the second phase of partial melting or as an alternative, the timing of cooling and exhumation of metamorphic core complex. Crystallization of the Nova Monte Verde migmatites was therefore coeval in part with upper crustal extension and ductile flow of the mid-crust, suggesting that crustal anatexis was widespread over much of the mid-crust during Statherian time (∼1800-1760Ma). Therefore, the tectonic history of the Nova Monte Verde core complex involved regional extension and exhumation of high-grade metamorphic rocks by transtensional tectonics. The following results are at least more compatible with, if not suggestive of, a continental rift setting than the traditionally accepted continental arc setting.ElsevierThe Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Cratoninfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article[S.l.]AMAZONIAN CRATONMIGMATITESCORE COMPLEXCRUSTAL EXTENSIONMETATEXITEinfo:eu-repo/semantics/openAccessengreponame:Repositório Institucional de Geociências - RIGEOinstname:Companhia de Pesquisa de Recursos Minerais (CPRM)instacron:CPRMORIGINALArquivo ART_CENTIFICO_1.pdfArquivo ART_CENTIFICO_1.pdfArtigo principalapplication/pdf7556125http://rigeo.cprm.gov.br/jspui/bitstream/doc/21509/1/Arquivo%20ART_CENTIFICO_1.pdfacbcca9fb1c9c6c9bf481ddd90cd6b63MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-84093http://rigeo.cprm.gov.br/jspui/bitstream/doc/21509/2/license.txt000f5492f47a74ccf195e8393d811186MD52TEXTArquivo ART_CENTIFICO_1.pdf.txtArquivo 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dc.title.en.fl_str_mv |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
title |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
spellingShingle |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton RIZZOTTO, Gilmar José AMAZONIAN CRATON MIGMATITES CORE COMPLEX CRUSTAL EXTENSION METATEXITE |
title_short |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
title_full |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
title_fullStr |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
title_full_unstemmed |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
title_sort |
The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian Craton |
author |
RIZZOTTO, Gilmar José |
author_facet |
RIZZOTTO, Gilmar José ALVES, Cleber Ladeira RIOS, Francisco Sene BARROS, Marcia Aparecida de Sant’Ana |
author_role |
author |
author2 |
ALVES, Cleber Ladeira RIOS, Francisco Sene BARROS, Marcia Aparecida de Sant’Ana |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
RIZZOTTO, Gilmar José ALVES, Cleber Ladeira RIOS, Francisco Sene BARROS, Marcia Aparecida de Sant’Ana |
dc.subject.en.en.fl_str_mv |
AMAZONIAN CRATON MIGMATITES CORE COMPLEX CRUSTAL EXTENSION METATEXITE |
topic |
AMAZONIAN CRATON MIGMATITES CORE COMPLEX CRUSTAL EXTENSION METATEXITE |
description |
The Nova Monte Verde metamorphic core complex is an arched structure located in the southern portion of the Rio Negro-Juruena geochronological Province and is part of a belt of metamorphic rocks containing gneiss and migmatite domes exhumed during Statherian extension of rifted Ventuari-Tapajós crust. This metamorphic core is bordered, both to the north and south, by felsic volcanic and plutonic rocks intensely foliated near the metamorphic core and becoming progressively undeformed as one moves away from the metamorphic core. U-Pb analyses of zircon and monazite from migmatites exposed in the core of the complex, coupled with a detailed structural analysis, enlighten the timing and duration of migmatite crystallization, indicating that crystallization, extensional deformation and exhumation of the core-complex were coeval. Analysis of a high melt fraction from migmatites outcroping near Bacaeri Farm suggest that the Nova Monte Verde metamorphic core complex records a history of neosome formation spanning at least 37 Ma, as indicated by 206Pb/238U ages (1800-1763Ma) for new zircon growth attributed to migmatization. Monazite from two samples yielded U-Pb ages of 1798 ± 29 Ma for the aluminous metatexite and 1754 ± 11 Ma for sillimanite-biotite metatexite. The former is interpreted as the metamorphic peak and main generation of leucosomes, and the latter as the second phase of partial melting or as an alternative, the timing of cooling and exhumation of metamorphic core complex. Crystallization of the Nova Monte Verde migmatites was therefore coeval in part with upper crustal extension and ductile flow of the mid-crust, suggesting that crustal anatexis was widespread over much of the mid-crust during Statherian time (∼1800-1760Ma). Therefore, the tectonic history of the Nova Monte Verde core complex involved regional extension and exhumation of high-grade metamorphic rocks by transtensional tectonics. The following results are at least more compatible with, if not suggestive of, a continental rift setting than the traditionally accepted continental arc setting. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-12-20T15:11:31Z |
dc.date.available.fl_str_mv |
2019-12-20T15:11:31Z |
dc.date.issued.fl_str_mv |
2019 |
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 |
RIZZOTTO, Gilmar Jose; ALVES, Cleber Ladeira; RIOS, Francisco Sene; BARROS, Marcia Aparecida de Sant’Ana. The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian craton. Journal of South American Earth Sciences, n. 91, p. 154-172, 2019. |
dc.identifier.uri.fl_str_mv |
https://rigeo.cprm.gov.br/handle/doc/21509 |
identifier_str_mv |
RIZZOTTO, Gilmar Jose; ALVES, Cleber Ladeira; RIOS, Francisco Sene; BARROS, Marcia Aparecida de Sant’Ana. The Nova Monte Verde metamorphic core complex: Tectonic implications for the southern Amazonian craton. Journal of South American Earth Sciences, n. 91, p. 154-172, 2019. |
url |
https://rigeo.cprm.gov.br/handle/doc/21509 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional de Geociências - RIGEO instname:Companhia de Pesquisa de Recursos Minerais (CPRM) instacron:CPRM |
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Companhia de Pesquisa de Recursos Minerais (CPRM) |
instacron_str |
CPRM |
institution |
CPRM |
reponame_str |
Repositório Institucional de Geociências - RIGEO |
collection |
Repositório Institucional de Geociências - RIGEO |
bitstream.url.fl_str_mv |
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