Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ)
Autor(a) principal: | |
---|---|
Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UERJ |
Texto Completo: | http://www.bdtd.uerj.br/handle/1/7080 |
Resumo: | Alkaline lamprophyres and alkaline diabases of the Serra do Mar Dyke Swarm (SMDS) outcrop along the Southeastern Brazil. These dykes intrude rocks of the so-called Rio Negro Magmatic Arc within the Late Proterozoic-Ordovician Ribeira Orogen and are associated with the opening of South Atlantic Ocean during the Late Cretaceous. Typically, the intrusions are subvertical bearing a NE-SW preferential trend which follows the main lineaments in the area. The lamprophyres are classified as monchiquites and camptonites and show holocrystalline and hypocrystalline textures, respectively. They also have panidiomorphic texture and olivine and clinopyroxene phenocrysts within a matrix composed essentially by these same minerals, kaersutite and biotite. Camptonites still have plagioclase in the matrix. The alkaline diabases are holo- to hypocrystalline, equi- to inequigranular rocks with olivine and/or clinopyroxene and/or plagioclase phenocrysts in a matrix composed essentially by these minerals. These alkaline rocks have miaskitic compositions. Lamprophyres are sodic, potassic and ultrapotassic and alkaline diabases are predominantly sodic. Petrogenetic modeling indicates that lamprophyres are unlikely to be cogenetic by evolutionary processes involving either fractional crystallization, with or without concomitant assimilation, or hybridization. The same applies to the alkaline diabases. Modal-batch partial melting models using samples representing parental liquids indicate that these alkalines mafic rocks are related to lherzolitic sources and that partial melting occurred in the spinel stability field, pointing to a thin continental lithosphere in the region. Lithogeochemical and Sr-Nd isotopic data show that the petrogenesis of these alkaline rocks can be assigned to mixing of mantle sources. Binary mixing models and assimilation tests reveal that the petrogenesis of the lamprophyres and alkaline diabases involve a large amount of participation of a fertile component with small contribution of an enriched component. TDM model ages for the studied rocks suggest remobilization ages of the of the lithospheric mantle during the Neoproterozoic, possibly related to the subduction of the San Francisco plate prior to the collision of the Ribeira Orogen. The high CaO/Al2O3 ratios of less evolved lamprophyric melts, high Zr contents, Zr/Hf and Ti/Eu negative correlations and association with carbonatites point to high CO2/H2O conditions during metassomatism of the subcontinental lithospheric mantle. Geodynamic models based on the non-isothermal asthenospheric mantle seem to apply to the studied mafic alkaline magmatism on a local scale although the isothermal asthenospheric mantle model appears to conceal the petrogenesis of other coeval alkaline provinces in central and southeastern Brazil. |
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Valente, Sérgio de Castrohttp://lattes.cnpq.br/7049948512331299Duarte, Beatriz Paschoalhttp://lattes.cnpq.br/0001020653445095Azzone, Rogério Guitarrarihttp://lattes.cnpq.br/6600544102749994http://lattes.cnpq.br/3109237342394417Magalhães, Joana Tiago Reis2021-01-05T15:34:32Z2013-02-222012-11-30MAGALHÃES, Joana Tiago Reis. Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ). 2012. 237 f. Dissertação (Mestrado em Análise de Bacias;Tectônia, Petrologia e Recursos Minerais) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2012.http://www.bdtd.uerj.br/handle/1/7080Alkaline lamprophyres and alkaline diabases of the Serra do Mar Dyke Swarm (SMDS) outcrop along the Southeastern Brazil. These dykes intrude rocks of the so-called Rio Negro Magmatic Arc within the Late Proterozoic-Ordovician Ribeira Orogen and are associated with the opening of South Atlantic Ocean during the Late Cretaceous. Typically, the intrusions are subvertical bearing a NE-SW preferential trend which follows the main lineaments in the area. The lamprophyres are classified as monchiquites and camptonites and show holocrystalline and hypocrystalline textures, respectively. They also have panidiomorphic texture and olivine and clinopyroxene phenocrysts within a matrix composed essentially by these same minerals, kaersutite and biotite. Camptonites still have plagioclase in the matrix. The alkaline diabases are holo- to hypocrystalline, equi- to inequigranular rocks with olivine and/or clinopyroxene and/or plagioclase phenocrysts in a matrix composed essentially by these minerals. These alkaline rocks have miaskitic compositions. Lamprophyres are sodic, potassic and ultrapotassic and alkaline diabases are predominantly sodic. Petrogenetic modeling indicates that lamprophyres are unlikely to be cogenetic by evolutionary processes involving either fractional crystallization, with or without concomitant assimilation, or hybridization. The same applies to the alkaline diabases. Modal-batch partial melting models using samples representing parental liquids indicate that these alkalines mafic rocks are related to lherzolitic sources and that partial melting occurred in the spinel stability field, pointing to a thin continental lithosphere in the region. Lithogeochemical and Sr-Nd isotopic data show that the petrogenesis of these alkaline rocks can be assigned to mixing of mantle sources. Binary mixing models and assimilation tests reveal that the petrogenesis of the lamprophyres and alkaline diabases involve a large amount of participation of a fertile component with small contribution of an enriched component. TDM model ages for the studied rocks suggest remobilization ages of the of the lithospheric mantle during the Neoproterozoic, possibly related to the subduction of the San Francisco plate prior to the collision of the Ribeira Orogen. The high CaO/Al2O3 ratios of less evolved lamprophyric melts, high Zr contents, Zr/Hf and Ti/Eu negative correlations and association with carbonatites point to high CO2/H2O conditions during metassomatism of the subcontinental lithospheric mantle. Geodynamic models based on the non-isothermal asthenospheric mantle seem to apply to the studied mafic alkaline magmatism on a local scale although the isothermal asthenospheric mantle model appears to conceal the petrogenesis of other coeval alkaline provinces in central and southeastern Brazil.Lamprófiros e diabásios alcalinos afloram no litoral dos estados de São Paulo e Rio de Janeiro e integram o Enxame de Diques da Serra do Mar (EDSM). Essas rochas ocorrem sob a forma de diques e intrudem o Orógeno Ribeira, de idade Neoproterozóica/Cambro-Ordoviciana, inserindo-se no contexto geodinâmico de abertura do Oceano Atlântico Sul durante o Cretáceo Superior. Essas intrusões são subverticais e orientam-se preferencialmente a NE-SW, seguindo a estruturação das rochas encaixantes. Os lamprófiros são classificados como monchiquitos e camptonitos e exibem, respectivamente, textura hipocristalina e holocristalina. Apresentam também textura panidiomórfica, fenocristais de clinopiroxênio e olivina, imersos em matriz formada essencialmente por esses mesmos minerais, além de biotita, kaersutita e minerais opacos. O camptonito apresenta ainda plagioclásio na matriz. Os diabásios alcalinos são hipocristalinos a holocristalinos, equigranulares a inequigranulares, com fenocristais de olivina e/ou clinopiroxênio e/ou plagioclásio, em uma matriz composta essencialmente por esses minerais. As rochas estudadas caracterizam séries alcalinas miaskíticas, com os lamprófiros sendo tanto sódicos, potássicos e ultrapotássicos e os diabásios alcalinos como predominantemente sódicos. Modelagens petrogenéticas envolvendo possíveis processos evolutivos mostram que é improvável que os lamprófiros sejam cogenéticos por processos evolutivos envolvendo tanto cristalização fracionada, com ou sem assimilação concomitante, quanto hibridização. O mesmo ocorre para os diabásios alcalinos. A discriminação de fontes mantélicas foi feita com base nos teores de elementos traços de amostras representativas de líquidos parentais e indica que esse magmatismo alcalino está relacionado a fontes lherzolíticas com fusão parcial na zona de estabilidade do espinélio, isto é, a poucas profundidades. Os dados litogeoquímicos e isotópicos do sistema Sr-Nd das rochas estudadas sugerem tanto o envolvimento de fontes férteis, associadas ao manto sublitosférico, quanto de fontes enriquecidas, relacionadas ao manto litosférico subcontinental. Modelagens de mistura binária revelam que a petrogênese dos lamprófiros e diabásios alcalinos envolveu uma grande participação de um componente fértil misturado com contribuições menores de um componente enriquecido. Idades TDM (760-557 Ma) obtidas sugerem remobilização do manto litosférico no Neoproterozóico, talvez relacionadas à subducção da Placa São Francisco preteritamente à colisão do Orógeno Ribeira. Altas razões CaO/Al2O3 para os líquidos lamprofíricos menos evoluídos, altos teores de Zr, correlações negativas Zr/Hf e Ti/Eu e associação com carbonatitos indicam condições metassomáticas de alto CO2/H2O. Em escala local, modelos geodinâmicos baseados na astenosfera não isotérmica parecem mais aplicáveis. No entanto, modelos geodinâmicos baseados na astenosfera isotérmica (com o envolvimento de plumas) parecem mais indicados num contexto regional, considerando-se outras províncias alcalinas contemporâneas e correlatas.Submitted by Boris Flegr (boris@uerj.br) on 2021-01-05T15:34:32Z No. of bitstreams: 5 Pre textuais Introducao e Parte 1.pdf: 1783184 bytes, checksum: d0e39a6d5ca7fad526da9a5cfe3726ef (MD5) Parte 2 A.pdf: 2889310 bytes, checksum: b00be9de04bf01d47830cfe48f063caf (MD5) Parte 2 B.pdf: 3065184 bytes, checksum: e3fe00433e88c14a396536788a5d3561 (MD5) Parte 2 C.pdf: 2971428 bytes, checksum: 38c5e191dbe9788eb1ed5374389f75d4 (MD5) Parte 3 a 5 e Referencias.pdf: 2838133 bytes, checksum: dd77383274dfa8ec369656e77c93e5ec (MD5)Made available in DSpace on 2021-01-05T15:34:32Z (GMT). No. of bitstreams: 5 Pre textuais Introducao e Parte 1.pdf: 1783184 bytes, checksum: d0e39a6d5ca7fad526da9a5cfe3726ef (MD5) Parte 2 A.pdf: 2889310 bytes, checksum: b00be9de04bf01d47830cfe48f063caf (MD5) Parte 2 B.pdf: 3065184 bytes, checksum: e3fe00433e88c14a396536788a5d3561 (MD5) Parte 2 C.pdf: 2971428 bytes, checksum: 38c5e191dbe9788eb1ed5374389f75d4 (MD5) Parte 3 a 5 e Referencias.pdf: 2838133 bytes, checksum: dd77383274dfa8ec369656e77c93e5ec (MD5) Previous issue date: 2012-11-30Conselho Nacional de Desenvolvimento Científico e Tecnológicoapplication/pdfporUniversidade do Estado do Rio de JaneiroPrograma de Pós-Graduação em Análise de Bacias e Faixas MóveisUERJBRCentro de Tecnologia e Ciências::Faculdade de GeologiaAlkaline lamprophyresAlkaline diabasesSerra do Mar ProvincePetrogenesisLate cretaceousLamprófiros alcalinosDiabásios alcalinosProvíncia Serra do MarPetrogêneseCretáceo superiorCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIAPetrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ)Petrogenesis of alkaline mafic rocks along the coast between São Sebastião and Parati - Southeastern Brazilinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UERJinstname:Universidade do Estado do Rio de Janeiro (UERJ)instacron:UERJORIGINALPre textuais Introducao e Parte 1.pdfapplication/pdf1783184http://www.bdtd.uerj.br/bitstream/1/7080/1/Pre+textuais+Introducao+e+Parte+1.pdfd0e39a6d5ca7fad526da9a5cfe3726efMD51Parte 2 A.pdfapplication/pdf2889310http://www.bdtd.uerj.br/bitstream/1/7080/2/Parte+2+A.pdfb00be9de04bf01d47830cfe48f063cafMD52Parte 2 B.pdfapplication/pdf3065184http://www.bdtd.uerj.br/bitstream/1/7080/3/Parte+2+B.pdfe3fe00433e88c14a396536788a5d3561MD53Parte 2 C.pdfapplication/pdf2971428http://www.bdtd.uerj.br/bitstream/1/7080/4/Parte+2+C.pdf38c5e191dbe9788eb1ed5374389f75d4MD54Parte 3 a 5 e Referencias.pdfapplication/pdf2838133http://www.bdtd.uerj.br/bitstream/1/7080/5/Parte+3+a+5+e+Referencias.pdfdd77383274dfa8ec369656e77c93e5ecMD551/70802024-02-27 14:16:07.849oai:www.bdtd.uerj.br:1/7080Biblioteca Digital de Teses e Dissertaçõeshttp://www.bdtd.uerj.br/PUBhttps://www.bdtd.uerj.br:8443/oai/requestbdtd.suporte@uerj.bropendoar:29032024-02-27T17:16:07Biblioteca Digital de Teses e Dissertações da UERJ - Universidade do Estado do Rio de Janeiro (UERJ)false |
dc.title.por.fl_str_mv |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
dc.title.alternative.eng.fl_str_mv |
Petrogenesis of alkaline mafic rocks along the coast between São Sebastião and Parati - Southeastern Brazil |
title |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
spellingShingle |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) Magalhães, Joana Tiago Reis Alkaline lamprophyres Alkaline diabases Serra do Mar Province Petrogenesis Late cretaceous Lamprófiros alcalinos Diabásios alcalinos Província Serra do Mar Petrogênese Cretáceo superior CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA |
title_short |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
title_full |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
title_fullStr |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
title_full_unstemmed |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
title_sort |
Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ) |
author |
Magalhães, Joana Tiago Reis |
author_facet |
Magalhães, Joana Tiago Reis |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Valente, Sérgio de Castro |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/7049948512331299 |
dc.contributor.referee1.fl_str_mv |
Duarte, Beatriz Paschoal |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/0001020653445095 |
dc.contributor.referee2.fl_str_mv |
Azzone, Rogério Guitarrari |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/6600544102749994 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3109237342394417 |
dc.contributor.author.fl_str_mv |
Magalhães, Joana Tiago Reis |
contributor_str_mv |
Valente, Sérgio de Castro Duarte, Beatriz Paschoal Azzone, Rogério Guitarrari |
dc.subject.eng.fl_str_mv |
Alkaline lamprophyres Alkaline diabases Serra do Mar Province Petrogenesis Late cretaceous |
topic |
Alkaline lamprophyres Alkaline diabases Serra do Mar Province Petrogenesis Late cretaceous Lamprófiros alcalinos Diabásios alcalinos Província Serra do Mar Petrogênese Cretáceo superior CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA |
dc.subject.por.fl_str_mv |
Lamprófiros alcalinos Diabásios alcalinos Província Serra do Mar Petrogênese Cretáceo superior |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA |
description |
Alkaline lamprophyres and alkaline diabases of the Serra do Mar Dyke Swarm (SMDS) outcrop along the Southeastern Brazil. These dykes intrude rocks of the so-called Rio Negro Magmatic Arc within the Late Proterozoic-Ordovician Ribeira Orogen and are associated with the opening of South Atlantic Ocean during the Late Cretaceous. Typically, the intrusions are subvertical bearing a NE-SW preferential trend which follows the main lineaments in the area. The lamprophyres are classified as monchiquites and camptonites and show holocrystalline and hypocrystalline textures, respectively. They also have panidiomorphic texture and olivine and clinopyroxene phenocrysts within a matrix composed essentially by these same minerals, kaersutite and biotite. Camptonites still have plagioclase in the matrix. The alkaline diabases are holo- to hypocrystalline, equi- to inequigranular rocks with olivine and/or clinopyroxene and/or plagioclase phenocrysts in a matrix composed essentially by these minerals. These alkaline rocks have miaskitic compositions. Lamprophyres are sodic, potassic and ultrapotassic and alkaline diabases are predominantly sodic. Petrogenetic modeling indicates that lamprophyres are unlikely to be cogenetic by evolutionary processes involving either fractional crystallization, with or without concomitant assimilation, or hybridization. The same applies to the alkaline diabases. Modal-batch partial melting models using samples representing parental liquids indicate that these alkalines mafic rocks are related to lherzolitic sources and that partial melting occurred in the spinel stability field, pointing to a thin continental lithosphere in the region. Lithogeochemical and Sr-Nd isotopic data show that the petrogenesis of these alkaline rocks can be assigned to mixing of mantle sources. Binary mixing models and assimilation tests reveal that the petrogenesis of the lamprophyres and alkaline diabases involve a large amount of participation of a fertile component with small contribution of an enriched component. TDM model ages for the studied rocks suggest remobilization ages of the of the lithospheric mantle during the Neoproterozoic, possibly related to the subduction of the San Francisco plate prior to the collision of the Ribeira Orogen. The high CaO/Al2O3 ratios of less evolved lamprophyric melts, high Zr contents, Zr/Hf and Ti/Eu negative correlations and association with carbonatites point to high CO2/H2O conditions during metassomatism of the subcontinental lithospheric mantle. Geodynamic models based on the non-isothermal asthenospheric mantle seem to apply to the studied mafic alkaline magmatism on a local scale although the isothermal asthenospheric mantle model appears to conceal the petrogenesis of other coeval alkaline provinces in central and southeastern Brazil. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012-11-30 |
dc.date.available.fl_str_mv |
2013-02-22 |
dc.date.accessioned.fl_str_mv |
2021-01-05T15:34:32Z |
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MAGALHÃES, Joana Tiago Reis. Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ). 2012. 237 f. Dissertação (Mestrado em Análise de Bacias;Tectônia, Petrologia e Recursos Minerais) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2012. |
dc.identifier.uri.fl_str_mv |
http://www.bdtd.uerj.br/handle/1/7080 |
identifier_str_mv |
MAGALHÃES, Joana Tiago Reis. Petrogênese das rochas máficas alcalinas do litoral entre São Sebastião (SP) e Parati (RJ). 2012. 237 f. Dissertação (Mestrado em Análise de Bacias;Tectônia, Petrologia e Recursos Minerais) - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2012. |
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http://www.bdtd.uerj.br/handle/1/7080 |
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Universidade do Estado do Rio de Janeiro |
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BR |
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Centro de Tecnologia e Ciências::Faculdade de Geologia |
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Universidade do Estado do Rio de Janeiro |
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