Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS)
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/220292 |
Resumo: | The Alfeu-01 kimberlite intrusion was discovered in 1994, and is hosted by granitoid rocks of the Pinheiro Machado Complex, of Neoproterozoic age, in the Sul-Riograndense shield. This kimberlite is melanocratic, and has an afanitic matrix where xenoliths of the host rocks as well as macrocrysts of phlogopite, rutil, garnet and, possibly diopside can be observed. The petrographic descriptions (basically phlogopite + olivine + talc + serpentine) indicate that it is an explosive breccia, probably of diatreme facies. In geochemical terms, the high contents of TiO2, MnO and K2O are characteristics, in contrast with diamondiferous intrusions of Minas Gerais. The garnets were divided into three different colors, a strong association of colors with the Fe2O3, MgO and Cr2O3contents having been observed. All garnets, identified as the pyrope type, are located in the mineral fields known as G4, G5 and G9, generally not associated to fertile intrusions. In the same way, the high oxidation grade in the Mg-ilmenite is not favorable for diamond preservation. Chromite data indicates that the mineral is out of the diamond inclusion field. Diopside of the intrusion is Cr-poor, and recognized as associated to an alkaline basalt suite. All mineralogical parameters characteristically diverge from the observed in fertile kimberlites of Minas Gerais; in this way, they strongly not encourage another prospecting works on the intrusion. |
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Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS)Minerals and indicators kimberlite diamond prospectivity the intrusion alpheus-01 (Canguçu, RS)Indicator mineralsKimberliteSul-Riograndense shieldThe Alfeu-01 kimberlite intrusion was discovered in 1994, and is hosted by granitoid rocks of the Pinheiro Machado Complex, of Neoproterozoic age, in the Sul-Riograndense shield. This kimberlite is melanocratic, and has an afanitic matrix where xenoliths of the host rocks as well as macrocrysts of phlogopite, rutil, garnet and, possibly diopside can be observed. The petrographic descriptions (basically phlogopite + olivine + talc + serpentine) indicate that it is an explosive breccia, probably of diatreme facies. In geochemical terms, the high contents of TiO2, MnO and K2O are characteristics, in contrast with diamondiferous intrusions of Minas Gerais. The garnets were divided into three different colors, a strong association of colors with the Fe2O3, MgO and Cr2O3contents having been observed. All garnets, identified as the pyrope type, are located in the mineral fields known as G4, G5 and G9, generally not associated to fertile intrusions. In the same way, the high oxidation grade in the Mg-ilmenite is not favorable for diamond preservation. Chromite data indicates that the mineral is out of the diamond inclusion field. Diopside of the intrusion is Cr-poor, and recognized as associated to an alkaline basalt suite. All mineralogical parameters characteristically diverge from the observed in fertile kimberlites of Minas Gerais; in this way, they strongly not encourage another prospecting works on the intrusion.Manoel Teixeira da Costa, Instituto de Geociências, Universidade Federal de Minas GeraisGEOMIL - Serviços de Mineração LtdaMestranda em Geologia Regional, Instituto de Geociências e Ciências Exatas, Universidade Estadual PaulistaServiço Geológico do Brasil – Companhia de Pesquisa de Recursos MineraisMestranda em Geologia Regional, Instituto de Geociências e Ciências Exatas, Universidade Estadual PaulistaUniversidade Federal de Minas Gerais (UFMG)GEOMIL - Serviços de Mineração LtdaUniversidade Estadual Paulista (UNESP)Serviço Geológico do Brasil – Companhia de Pesquisa de Recursos MineraisChaves, Mario Luiz De Sá CarneiroAndrade, Kerley WandersonAzzi, Andrezza De Assis [UNESP]Silveira, Francisco Valdir2022-04-28T19:00:38Z2022-04-28T19:00:38Z2014-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article535-548Geociencias, v. 33, n. 4, p. 535-548, 2014.1980-900X0101-9082http://hdl.handle.net/11449/2202922-s2.0-84921459832Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporGeocienciasinfo:eu-repo/semantics/openAccess2022-04-28T19:00:38Zoai:repositorio.unesp.br:11449/220292Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:50:05.798501Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) Minerals and indicators kimberlite diamond prospectivity the intrusion alpheus-01 (Canguçu, RS) |
title |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) |
spellingShingle |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) Chaves, Mario Luiz De Sá Carneiro Indicator minerals Kimberlite Sul-Riograndense shield |
title_short |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) |
title_full |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) |
title_fullStr |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) |
title_full_unstemmed |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) |
title_sort |
Minerais indicadores kimberlíticos e prospectividade diamantífera da intrusão alfeu-01 (canguçu, RS) |
author |
Chaves, Mario Luiz De Sá Carneiro |
author_facet |
Chaves, Mario Luiz De Sá Carneiro Andrade, Kerley Wanderson Azzi, Andrezza De Assis [UNESP] Silveira, Francisco Valdir |
author_role |
author |
author2 |
Andrade, Kerley Wanderson Azzi, Andrezza De Assis [UNESP] Silveira, Francisco Valdir |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Minas Gerais (UFMG) GEOMIL - Serviços de Mineração Ltda Universidade Estadual Paulista (UNESP) Serviço Geológico do Brasil – Companhia de Pesquisa de Recursos Minerais |
dc.contributor.author.fl_str_mv |
Chaves, Mario Luiz De Sá Carneiro Andrade, Kerley Wanderson Azzi, Andrezza De Assis [UNESP] Silveira, Francisco Valdir |
dc.subject.por.fl_str_mv |
Indicator minerals Kimberlite Sul-Riograndense shield |
topic |
Indicator minerals Kimberlite Sul-Riograndense shield |
description |
The Alfeu-01 kimberlite intrusion was discovered in 1994, and is hosted by granitoid rocks of the Pinheiro Machado Complex, of Neoproterozoic age, in the Sul-Riograndense shield. This kimberlite is melanocratic, and has an afanitic matrix where xenoliths of the host rocks as well as macrocrysts of phlogopite, rutil, garnet and, possibly diopside can be observed. The petrographic descriptions (basically phlogopite + olivine + talc + serpentine) indicate that it is an explosive breccia, probably of diatreme facies. In geochemical terms, the high contents of TiO2, MnO and K2O are characteristics, in contrast with diamondiferous intrusions of Minas Gerais. The garnets were divided into three different colors, a strong association of colors with the Fe2O3, MgO and Cr2O3contents having been observed. All garnets, identified as the pyrope type, are located in the mineral fields known as G4, G5 and G9, generally not associated to fertile intrusions. In the same way, the high oxidation grade in the Mg-ilmenite is not favorable for diamond preservation. Chromite data indicates that the mineral is out of the diamond inclusion field. Diopside of the intrusion is Cr-poor, and recognized as associated to an alkaline basalt suite. All mineralogical parameters characteristically diverge from the observed in fertile kimberlites of Minas Gerais; in this way, they strongly not encourage another prospecting works on the intrusion. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-01-01 2022-04-28T19:00:38Z 2022-04-28T19:00:38Z |
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 |
Geociencias, v. 33, n. 4, p. 535-548, 2014. 1980-900X 0101-9082 http://hdl.handle.net/11449/220292 2-s2.0-84921459832 |
identifier_str_mv |
Geociencias, v. 33, n. 4, p. 535-548, 2014. 1980-900X 0101-9082 2-s2.0-84921459832 |
url |
http://hdl.handle.net/11449/220292 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Geociencias |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
535-548 |
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 |
|
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1808129363905871872 |