Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1111/jmg.12637 http://hdl.handle.net/11449/233703 |
Resumo: | We use a combination of several in situ techniques to assess the P-T-t path of high-pressure granulites from the Passos Nappe in the Southern Brasília Orogen (SE Brazil). Quantitative element mapping and single-element thermometers (Zr-in-rutile and Ti-in-quartz) are coupled with P-T pseudosections and monazite and rutile dating. Compositional and temperature maps, based on cathodoluminescence mapping and in situ analyses of Ti-in-quartz, are presented as a novel approach to evaluate crystallization temperature. The studied rocks have a pelitic protolith and record a peak pressure assemblage of garnet + kyanite + rutile + K-feldspar + quartz + melt ± plagioclase that formed at ~830°C and 1.2 GPa. Retrograde conditions of ~560°C and 0.6 GPa are determined based on the grossular content of garnet and the crystallization of biotite and ilmenite. Metamorphic peak conditions occurred ca. 635 Ma, according to monazite dating, with a younger date of ca. 615 Ma associated with later kyanite crystallization. Rutile ages of ca. 590 Ma are linked to the late retrograde stage (at ~600°C). Results show that the distribution of Ti-in-quartz is heterogeneous, decreasing in abundance towards the rim of crystals, though the higher temperatures constrained with Ti-in-quartz thermometry are broadly consistent with peak conditions. The peak pressure conditions are consistent with continental collision setting in the Southern Brasília Orogen and were followed by an early cooling/decompression stage and then by a slow cooling during exhumation and transport to shallower crustal levels. |
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Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronologycathodoluminescenceP-T-t pathphase equilibrium modeling (THERMOCALC)single element thermometersWestern GondwanaXMapToolsWe use a combination of several in situ techniques to assess the P-T-t path of high-pressure granulites from the Passos Nappe in the Southern Brasília Orogen (SE Brazil). Quantitative element mapping and single-element thermometers (Zr-in-rutile and Ti-in-quartz) are coupled with P-T pseudosections and monazite and rutile dating. Compositional and temperature maps, based on cathodoluminescence mapping and in situ analyses of Ti-in-quartz, are presented as a novel approach to evaluate crystallization temperature. The studied rocks have a pelitic protolith and record a peak pressure assemblage of garnet + kyanite + rutile + K-feldspar + quartz + melt ± plagioclase that formed at ~830°C and 1.2 GPa. Retrograde conditions of ~560°C and 0.6 GPa are determined based on the grossular content of garnet and the crystallization of biotite and ilmenite. Metamorphic peak conditions occurred ca. 635 Ma, according to monazite dating, with a younger date of ca. 615 Ma associated with later kyanite crystallization. Rutile ages of ca. 590 Ma are linked to the late retrograde stage (at ~600°C). Results show that the distribution of Ti-in-quartz is heterogeneous, decreasing in abundance towards the rim of crystals, though the higher temperatures constrained with Ti-in-quartz thermometry are broadly consistent with peak conditions. The peak pressure conditions are consistent with continental collision setting in the Southern Brasília Orogen and were followed by an early cooling/decompression stage and then by a slow cooling during exhumation and transport to shallower crustal levels.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Department of Geology São Paulo State UniversityDepartment of Mineralogy and Geotectonics University of São PauloInstitute of Geological Sciences University of BernTEKTOS Research Group Faculdade de Geologia Universidade do Estado Rio de Janeiro (UERJ)Department of Earth Sciences University of GothenburgDepartment of Geosciences Virginia TechDepartment of Geology São Paulo State UniversityCNPq: 141604/2018-2FAPESP: 2015/05230-0FAPESP: 2016/22627-3CNPq: 305720/2001-1CNPq: 311606/2019-9CNPq: 486328/2013-9Universidade Estadual Paulista (UNESP)Universidade de São Paulo (USP)University of BernUniversidade do Estado do Rio de Janeiro (UERJ)University of GothenburgVirginia TechFumes, Regiane Andrade [UNESP]Luvizotto, George Luiz [UNESP]Moraes, RenatoLanari, PierreValeriano, Claudio de MorissonZack, ThomasCaddick, Mark J.Simões, Luiz Sergio Amarante [UNESP]2022-05-01T09:47:20Z2022-05-01T09:47:20Z2022-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article517-552http://dx.doi.org/10.1111/jmg.12637Journal of Metamorphic Geology, v. 40, n. 3, p. 517-552, 2022.1525-13140263-4929http://hdl.handle.net/11449/23370310.1111/jmg.126372-s2.0-85117361928Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Metamorphic Geologyinfo:eu-repo/semantics/openAccess2022-05-01T09:47:20Zoai:repositorio.unesp.br:11449/233703Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:00:23.575174Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
title |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
spellingShingle |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology Fumes, Regiane Andrade [UNESP] cathodoluminescence P-T-t path phase equilibrium modeling (THERMOCALC) single element thermometers Western Gondwana XMapTools |
title_short |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
title_full |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
title_fullStr |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
title_full_unstemmed |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
title_sort |
Petrochronology of high-pressure granulite facies rocks from Southern Brasília Orogen, SE Brazil: Combining quantitative compositional mapping, single-element thermometry and geochronology |
author |
Fumes, Regiane Andrade [UNESP] |
author_facet |
Fumes, Regiane Andrade [UNESP] Luvizotto, George Luiz [UNESP] Moraes, Renato Lanari, Pierre Valeriano, Claudio de Morisson Zack, Thomas Caddick, Mark J. Simões, Luiz Sergio Amarante [UNESP] |
author_role |
author |
author2 |
Luvizotto, George Luiz [UNESP] Moraes, Renato Lanari, Pierre Valeriano, Claudio de Morisson Zack, Thomas Caddick, Mark J. Simões, Luiz Sergio Amarante [UNESP] |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidade de São Paulo (USP) University of Bern Universidade do Estado do Rio de Janeiro (UERJ) University of Gothenburg Virginia Tech |
dc.contributor.author.fl_str_mv |
Fumes, Regiane Andrade [UNESP] Luvizotto, George Luiz [UNESP] Moraes, Renato Lanari, Pierre Valeriano, Claudio de Morisson Zack, Thomas Caddick, Mark J. Simões, Luiz Sergio Amarante [UNESP] |
dc.subject.por.fl_str_mv |
cathodoluminescence P-T-t path phase equilibrium modeling (THERMOCALC) single element thermometers Western Gondwana XMapTools |
topic |
cathodoluminescence P-T-t path phase equilibrium modeling (THERMOCALC) single element thermometers Western Gondwana XMapTools |
description |
We use a combination of several in situ techniques to assess the P-T-t path of high-pressure granulites from the Passos Nappe in the Southern Brasília Orogen (SE Brazil). Quantitative element mapping and single-element thermometers (Zr-in-rutile and Ti-in-quartz) are coupled with P-T pseudosections and monazite and rutile dating. Compositional and temperature maps, based on cathodoluminescence mapping and in situ analyses of Ti-in-quartz, are presented as a novel approach to evaluate crystallization temperature. The studied rocks have a pelitic protolith and record a peak pressure assemblage of garnet + kyanite + rutile + K-feldspar + quartz + melt ± plagioclase that formed at ~830°C and 1.2 GPa. Retrograde conditions of ~560°C and 0.6 GPa are determined based on the grossular content of garnet and the crystallization of biotite and ilmenite. Metamorphic peak conditions occurred ca. 635 Ma, according to monazite dating, with a younger date of ca. 615 Ma associated with later kyanite crystallization. Rutile ages of ca. 590 Ma are linked to the late retrograde stage (at ~600°C). Results show that the distribution of Ti-in-quartz is heterogeneous, decreasing in abundance towards the rim of crystals, though the higher temperatures constrained with Ti-in-quartz thermometry are broadly consistent with peak conditions. The peak pressure conditions are consistent with continental collision setting in the Southern Brasília Orogen and were followed by an early cooling/decompression stage and then by a slow cooling during exhumation and transport to shallower crustal levels. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-05-01T09:47:20Z 2022-05-01T09:47:20Z 2022-04-01 |
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.uri.fl_str_mv |
http://dx.doi.org/10.1111/jmg.12637 Journal of Metamorphic Geology, v. 40, n. 3, p. 517-552, 2022. 1525-1314 0263-4929 http://hdl.handle.net/11449/233703 10.1111/jmg.12637 2-s2.0-85117361928 |
url |
http://dx.doi.org/10.1111/jmg.12637 http://hdl.handle.net/11449/233703 |
identifier_str_mv |
Journal of Metamorphic Geology, v. 40, n. 3, p. 517-552, 2022. 1525-1314 0263-4929 10.1111/jmg.12637 2-s2.0-85117361928 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Metamorphic Geology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
517-552 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128884230586368 |