Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane.
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/jspui/handle/123456789/13478 http://dx.doi.org/10.1590/2317-4889202020190120 |
Resumo: | Mineralogical evolution of ophiolites is significant to understand paleo-oceanic crust and mantle requiring multi-proxy techniques to identify steps in the processes. We studied the Bossoroca ophiolite from the southern Brasiliano Orogen, a prime example of Tonian accretion to an oceanic island arc. Integration of field geology, aeromagnetometry, aerogamaspectrometry, electron microprobe analyses, and compositional maps of minerals led to the decoding of oceanic and continental processes. The ophiolite is highly magnetic and low-K and is positioned at the base of the superstructure. We studied amphibolite, tourmalinite, and chromite-talc-magnesite granofels from the ophiolite, Capivaras diorite from the Cambaí Complex infrastructure and one metavolcanoclastic rock from the Vacacaí Group superstructure. Honblende is zoned in all rock types. Low-Ti hornblende is compatible with medium-pressure metamorphism at 7 kbar. This M1 to M2 amphibolite facies resulted in the widespread association of olivine + talc in metaserpentinite. Dravite is similar to tourmaline from the Ibaré ophiolite. Andesine and oligoclase are dominant and albite minor. Cr-spinel in granofels recrystallized in greenschist facies; host rock originated by carbonatization of serpentinite formed in the oceanic crust along with chloritite and tourmalinite. Serpentinite rare earth elements (REE) suggest origin in depleted mantle peridotite. The ophiolite evolved in the Adamastor Ocean until incorporation into the island arc. |
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Massuda, Amanda JulianoHartmann, Leo AfraneoQueiroga, Gláucia NascimentoCastro, Marco Paulo deLeandro, Carolina GonçalvesSavian, Jairo Francisco2021-08-16T13:35:31Z2021-08-16T13:35:31Z2020MASSUDA, A. J. et al. Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. Brazilian Journal of Geology, v. 50, n. 4, p. e20190120, 2020. Disponível em: <https://www.scielo.br/scielo.php?pid=S2317-48892020000400307&script=sci_arttext&tlng=en>. Acesso em: 19 fev. 2021.2317-4692http://www.repositorio.ufop.br/jspui/handle/123456789/13478http://dx.doi.org/10.1590/2317-4889202020190120Mineralogical evolution of ophiolites is significant to understand paleo-oceanic crust and mantle requiring multi-proxy techniques to identify steps in the processes. We studied the Bossoroca ophiolite from the southern Brasiliano Orogen, a prime example of Tonian accretion to an oceanic island arc. Integration of field geology, aeromagnetometry, aerogamaspectrometry, electron microprobe analyses, and compositional maps of minerals led to the decoding of oceanic and continental processes. The ophiolite is highly magnetic and low-K and is positioned at the base of the superstructure. We studied amphibolite, tourmalinite, and chromite-talc-magnesite granofels from the ophiolite, Capivaras diorite from the Cambaí Complex infrastructure and one metavolcanoclastic rock from the Vacacaí Group superstructure. Honblende is zoned in all rock types. Low-Ti hornblende is compatible with medium-pressure metamorphism at 7 kbar. This M1 to M2 amphibolite facies resulted in the widespread association of olivine + talc in metaserpentinite. Dravite is similar to tourmaline from the Ibaré ophiolite. Andesine and oligoclase are dominant and albite minor. Cr-spinel in granofels recrystallized in greenschist facies; host rock originated by carbonatization of serpentinite formed in the oceanic crust along with chloritite and tourmalinite. Serpentinite rare earth elements (REE) suggest origin in depleted mantle peridotite. The ophiolite evolved in the Adamastor Ocean until incorporation into the island arc.This is an open access article distributed under the terms of the Creative Commons license. Fonte: o PDF do artigo.info:eu-repo/semantics/openAccessChromite-talc-magnesite granofelsTourmaliniteMetasomatismAerogeophysicsMineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPORIGINALARTIGO_MineralogicalEvolutionNothern.pdfARTIGO_MineralogicalEvolutionNothern.pdfapplication/pdf16129731http://www.repositorio.ufop.br/bitstream/123456789/13478/1/ARTIGO_MineralogicalEvolutionNothern.pdfa2a688c8da04224b0305e3904f9501a3MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://www.repositorio.ufop.br/bitstream/123456789/13478/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52123456789/134782021-08-16 09:35:36.655oai:localhost:123456789/13478Tk9URTogUExBQ0UgWU9VUiBPV04gTElDRU5TRSBIRVJFClRoaXMgc2FtcGxlIGxpY2Vuc2UgaXMgcHJvdmlkZWQgZm9yIGluZm9ybWF0aW9uYWwgcHVycG9zZXMgb25seS4KCk5PTi1FWENMVVNJVkUgRElTVFJJQlVUSU9OIExJQ0VOU0UKCkJ5IHNpZ25pbmcgYW5kIHN1Ym1pdHRpbmcgdGhpcyBsaWNlbnNlLCB5b3UgKHRoZSBhdXRob3Iocykgb3IgY29weXJpZ2h0Cm93bmVyKSBncmFudHMgdG8gRFNwYWNlIFVuaXZlcnNpdHkgKERTVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24gKGluY2x1ZGluZwp0aGUgYWJzdHJhY3QpIHdvcmxkd2lkZSBpbiBwcmludCBhbmQgZWxlY3Ryb25pYyBmb3JtYXQgYW5kIGluIGFueSBtZWRpdW0sCmluY2x1ZGluZyBidXQgbm90IGxpbWl0ZWQgdG8gYXVkaW8gb3IgdmlkZW8uCgpZb3UgYWdyZWUgdGhhdCBEU1UgbWF5LCB3aXRob3V0IGNoYW5naW5nIHRoZSBjb250ZW50LCB0cmFuc2xhdGUgdGhlCnN1Ym1pc3Npb24gdG8gYW55IG1lZGl1bSBvciBmb3JtYXQgZm9yIHRoZSBwdXJwb3NlIG9mIHByZXNlcnZhdGlvbi4KCllvdSBhbHNvIGFncmVlIHRoYXQgRFNVIG1heSBrZWVwIG1vcmUgdGhhbiBvbmUgY29weSBvZiB0aGlzIHN1Ym1pc3Npb24gZm9yCnB1cnBvc2VzIG9mIHNlY3VyaXR5LCBiYWNrLXVwIGFuZCBwcmVzZXJ2YXRpb24uCgpZb3UgcmVwcmVzZW50IHRoYXQgdGhlIHN1Ym1pc3Npb24gaXMgeW91ciBvcmlnaW5hbCB3b3JrLCBhbmQgdGhhdCB5b3UgaGF2ZQp0aGUgcmlnaHQgdG8gZ3JhbnQgdGhlIHJpZ2h0cyBjb250YWluZWQgaW4gdGhpcyBsaWNlbnNlLiBZb3UgYWxzbyByZXByZXNlbnQKdGhhdCB5b3VyIHN1Ym1pc3Npb24gZG9lcyBub3QsIHRvIHRoZSBiZXN0IG9mIHlvdXIga25vd2xlZGdlLCBpbmZyaW5nZSB1cG9uCmFueW9uZSdzIGNvcHlyaWdodC4KCklmIHRoZSBzdWJtaXNzaW9uIGNvbnRhaW5zIG1hdGVyaWFsIGZvciB3aGljaCB5b3UgZG8gbm90IGhvbGQgY29weXJpZ2h0LAp5b3UgcmVwcmVzZW50IHRoYXQgeW91IGhhdmUgb2J0YWluZWQgdGhlIHVucmVzdHJpY3RlZCBwZXJtaXNzaW9uIG9mIHRoZQpjb3B5cmlnaHQgb3duZXIgdG8gZ3JhbnQgRFNVIHRoZSByaWdodHMgcmVxdWlyZWQgYnkgdGhpcyBsaWNlbnNlLCBhbmQgdGhhdApzdWNoIHRoaXJkLXBhcnR5IG93bmVkIG1hdGVyaWFsIGlzIGNsZWFybHkgaWRlbnRpZmllZCBhbmQgYWNrbm93bGVkZ2VkCndpdGhpbiB0aGUgdGV4dCBvciBjb250ZW50IG9mIHRoZSBzdWJtaXNzaW9uLgoKSUYgVEhFIFNVQk1JU1NJT04gSVMgQkFTRUQgVVBPTiBXT1JLIFRIQVQgSEFTIEJFRU4gU1BPTlNPUkVEIE9SIFNVUFBPUlRFRApCWSBBTiBBR0VOQ1kgT1IgT1JHQU5JWkFUSU9OIE9USEVSIFRIQU4gRFNVLCBZT1UgUkVQUkVTRU5UIFRIQVQgWU9VIEhBVkUKRlVMRklMTEVEIEFOWSBSSUdIVCBPRiBSRVZJRVcgT1IgT1RIRVIgT0JMSUdBVElPTlMgUkVRVUlSRUQgQlkgU1VDSApDT05UUkFDVCBPUiBBR1JFRU1FTlQuCgpEU1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZQpzdWJtaXNzaW9uLCBhbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMKbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332021-08-16T13:35:36Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
title |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
spellingShingle |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. Massuda, Amanda Juliano Chromite-talc-magnesite granofels Tourmalinite Metasomatism Aerogeophysics |
title_short |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
title_full |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
title_fullStr |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
title_full_unstemmed |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
title_sort |
Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. |
author |
Massuda, Amanda Juliano |
author_facet |
Massuda, Amanda Juliano Hartmann, Leo Afraneo Queiroga, Gláucia Nascimento Castro, Marco Paulo de Leandro, Carolina Gonçalves Savian, Jairo Francisco |
author_role |
author |
author2 |
Hartmann, Leo Afraneo Queiroga, Gláucia Nascimento Castro, Marco Paulo de Leandro, Carolina Gonçalves Savian, Jairo Francisco |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Massuda, Amanda Juliano Hartmann, Leo Afraneo Queiroga, Gláucia Nascimento Castro, Marco Paulo de Leandro, Carolina Gonçalves Savian, Jairo Francisco |
dc.subject.por.fl_str_mv |
Chromite-talc-magnesite granofels Tourmalinite Metasomatism Aerogeophysics |
topic |
Chromite-talc-magnesite granofels Tourmalinite Metasomatism Aerogeophysics |
description |
Mineralogical evolution of ophiolites is significant to understand paleo-oceanic crust and mantle requiring multi-proxy techniques to identify steps in the processes. We studied the Bossoroca ophiolite from the southern Brasiliano Orogen, a prime example of Tonian accretion to an oceanic island arc. Integration of field geology, aeromagnetometry, aerogamaspectrometry, electron microprobe analyses, and compositional maps of minerals led to the decoding of oceanic and continental processes. The ophiolite is highly magnetic and low-K and is positioned at the base of the superstructure. We studied amphibolite, tourmalinite, and chromite-talc-magnesite granofels from the ophiolite, Capivaras diorite from the Cambaí Complex infrastructure and one metavolcanoclastic rock from the Vacacaí Group superstructure. Honblende is zoned in all rock types. Low-Ti hornblende is compatible with medium-pressure metamorphism at 7 kbar. This M1 to M2 amphibolite facies resulted in the widespread association of olivine + talc in metaserpentinite. Dravite is similar to tourmaline from the Ibaré ophiolite. Andesine and oligoclase are dominant and albite minor. Cr-spinel in granofels recrystallized in greenschist facies; host rock originated by carbonatization of serpentinite formed in the oceanic crust along with chloritite and tourmalinite. Serpentinite rare earth elements (REE) suggest origin in depleted mantle peridotite. The ophiolite evolved in the Adamastor Ocean until incorporation into the island arc. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2021-08-16T13:35:31Z |
dc.date.available.fl_str_mv |
2021-08-16T13:35:31Z |
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 |
MASSUDA, A. J. et al. Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. Brazilian Journal of Geology, v. 50, n. 4, p. e20190120, 2020. Disponível em: <https://www.scielo.br/scielo.php?pid=S2317-48892020000400307&script=sci_arttext&tlng=en>. Acesso em: 19 fev. 2021. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/jspui/handle/123456789/13478 |
dc.identifier.issn.none.fl_str_mv |
2317-4692 |
dc.identifier.doi.pt_BR.fl_str_mv |
http://dx.doi.org/10.1590/2317-4889202020190120 |
identifier_str_mv |
MASSUDA, A. J. et al. Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. Brazilian Journal of Geology, v. 50, n. 4, p. e20190120, 2020. Disponível em: <https://www.scielo.br/scielo.php?pid=S2317-48892020000400307&script=sci_arttext&tlng=en>. Acesso em: 19 fev. 2021. 2317-4692 |
url |
http://www.repositorio.ufop.br/jspui/handle/123456789/13478 http://dx.doi.org/10.1590/2317-4889202020190120 |
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