Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic
The Pitangui Synclinorium is located in the northwestern portion of the Quadrilátero Ferrífero mineral province, São Francisco Craton, in southeast Brazil. It corresponds to a NW-SE-trending synformal structure composed of an Archean greenstone belt sequence, which is covered by Paleoproterozoic me...
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| Format: | Article |
| Language: | English |
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Serviço Geológico do Brasil (CPRM)
2023-03-01
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| Series: | Journal of the Geological Survey of Brazil |
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| Online Access: | https://jgsb.cprm.gov.br/index.php/journal/article/view/197 |
| _version_ | 1797704335782576128 |
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| author | Marcelo de Souza Marinho Joana Reis Magalhães Julio Cesar Lombello Joanna Araújo Luiz Paulo Pedrosa Di Salvio Rosane Nascimento Silva Denise Canabrava Brito Wilson Luis Feboli Camila Franco Basto |
| author_facet | Marcelo de Souza Marinho Joana Reis Magalhães Julio Cesar Lombello Joanna Araújo Luiz Paulo Pedrosa Di Salvio Rosane Nascimento Silva Denise Canabrava Brito Wilson Luis Feboli Camila Franco Basto |
| author_sort | Marcelo de Souza Marinho |
| collection | DOAJ |
| description |
The Pitangui Synclinorium is located in the northwestern portion of the Quadrilátero Ferrífero mineral province, São Francisco Craton, in southeast Brazil. It corresponds to a NW-SE-trending synformal structure composed of an Archean greenstone belt sequence, which is covered by Paleoproterozoic metasedimentary rocks to Neoproterozoic sedimentary rocks, and surrounded by Archean granite-gneiss complexes. This study reports the first detailed 1:25.000 scale geological mapping in the Pitangui Synclinorium and provides cartographic, stratigraphic and petrographic improvements, allowing the formalization of its lithostratigraphic units and unraveling the sedimentary and volcanic depositional environments. The Archean Pitangui greenstone belt occurs in most parts of the homonymous synclinorium, and is subdivided into the Pitangui Group and the Antimes Formation. The metavolcano-sedimentary sequence of the Pitangui Group comprises basal mafic/ultramafic metavolcanic rocks with subordinate felsic/intermediate metavolcanic and metavolcaniclastic rocks of the Rio Pará Formation, suggesting a bimodal volcanism. It is followed by volcanogenic and chemical metasedimentary rocks of the Rio São João Formation, and pelitic to sandy metasedimentary rocks of the Onça do Pitangui Formation deposited in subaqueous environments mainly corresponding to submarine fan systems. The occurrence of clastic rocks increases towards the top of the sequence. The Antimes Formation comprises quartzites and metaconglomerates related to fluvial and fan delta depositional environments. The Pitangui greenstone belt is overlapped, in the central and northwest regions of the study area, by the Fazenda Tapera Formation, a Paleoproterozoic siliciclastic package containing arkosic metasandstones, metagreywackes and metarhythmites deposited in a shallow marine environment. Subordinated tuff layers occur as ash/fall deposits from distal volcanism. Neoproterozoic clastic-chemical sedimentary rocks of the Bambuí Group cover the northern portions of the synclinorium, and are mainly composed of diamictites, limestones, marls and rhythmites from the Carrancas (lacustrine or restricted marine), Sete Lagoas (shallow marine) and Serra de Santa Helena formations (deep water grading to prodelta and delta front).
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| first_indexed | 2024-03-12T05:17:49Z |
| format | Article |
| id | doaj.art-894158d2ad7d4341938cc7f3ae89365a |
| institution | Directory Open Access Journal |
| issn | 2595-1939 |
| language | English |
| last_indexed | 2024-03-12T05:17:49Z |
| publishDate | 2023-03-01 |
| publisher | Serviço Geológico do Brasil (CPRM) |
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| series | Journal of the Geological Survey of Brazil |
| spelling | doaj.art-894158d2ad7d4341938cc7f3ae89365a2023-09-03T07:54:48ZengServiço Geológico do Brasil (CPRM)Journal of the Geological Survey of Brazil2595-19392023-03-016210.29396/jgsb.2023.v6.n2.1Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to NeoproterozoicMarcelo de Souza Marinho0Joana Reis Magalhães1Julio Cesar Lombello2Joanna Araújo3Luiz Paulo Pedrosa Di Salvio4Rosane Nascimento Silva5Denise Canabrava Brito6Wilson Luis Feboli7Camila Franco Basto8Geological Survey of Brazil (SGB-CPRM)Geological Survey of Brazil (SGB-CPRM)Geological Survey of Brazil (SGB-CPRM)Geological Survey of BrazilGeological Survey of Brazil (SGB-CPRM)Geological Survey of Brazil (SGB-CPRM)Geological Survey of Brazil (SGB-CPRM)Geological Survey of Brazil (SGB-CPRM)Geological Survey of Brazil (SGB-CPRM) The Pitangui Synclinorium is located in the northwestern portion of the Quadrilátero Ferrífero mineral province, São Francisco Craton, in southeast Brazil. It corresponds to a NW-SE-trending synformal structure composed of an Archean greenstone belt sequence, which is covered by Paleoproterozoic metasedimentary rocks to Neoproterozoic sedimentary rocks, and surrounded by Archean granite-gneiss complexes. This study reports the first detailed 1:25.000 scale geological mapping in the Pitangui Synclinorium and provides cartographic, stratigraphic and petrographic improvements, allowing the formalization of its lithostratigraphic units and unraveling the sedimentary and volcanic depositional environments. The Archean Pitangui greenstone belt occurs in most parts of the homonymous synclinorium, and is subdivided into the Pitangui Group and the Antimes Formation. The metavolcano-sedimentary sequence of the Pitangui Group comprises basal mafic/ultramafic metavolcanic rocks with subordinate felsic/intermediate metavolcanic and metavolcaniclastic rocks of the Rio Pará Formation, suggesting a bimodal volcanism. It is followed by volcanogenic and chemical metasedimentary rocks of the Rio São João Formation, and pelitic to sandy metasedimentary rocks of the Onça do Pitangui Formation deposited in subaqueous environments mainly corresponding to submarine fan systems. The occurrence of clastic rocks increases towards the top of the sequence. The Antimes Formation comprises quartzites and metaconglomerates related to fluvial and fan delta depositional environments. The Pitangui greenstone belt is overlapped, in the central and northwest regions of the study area, by the Fazenda Tapera Formation, a Paleoproterozoic siliciclastic package containing arkosic metasandstones, metagreywackes and metarhythmites deposited in a shallow marine environment. Subordinated tuff layers occur as ash/fall deposits from distal volcanism. Neoproterozoic clastic-chemical sedimentary rocks of the Bambuí Group cover the northern portions of the synclinorium, and are mainly composed of diamictites, limestones, marls and rhythmites from the Carrancas (lacustrine or restricted marine), Sete Lagoas (shallow marine) and Serra de Santa Helena formations (deep water grading to prodelta and delta front). https://jgsb.cprm.gov.br/index.php/journal/article/view/197Greenstone beltVolcanic associationsRhyacian basinEdiacaran sedimentationSão Francisco Craton |
| spellingShingle | Marcelo de Souza Marinho Joana Reis Magalhães Julio Cesar Lombello Joanna Araújo Luiz Paulo Pedrosa Di Salvio Rosane Nascimento Silva Denise Canabrava Brito Wilson Luis Feboli Camila Franco Basto Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic Journal of the Geological Survey of Brazil Greenstone belt Volcanic associations Rhyacian basin Ediacaran sedimentation São Francisco Craton |
| title | Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic |
| title_full | Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic |
| title_fullStr | Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic |
| title_full_unstemmed | Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic |
| title_short | Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic |
| title_sort | stratigraphy of the pitangui synclinorium northwest of the quadrilatero ferrifero mineral province brazil magmatism and sedimentation from archean to neoproterozoic |
| topic | Greenstone belt Volcanic associations Rhyacian basin Ediacaran sedimentation São Francisco Craton |
| url | https://jgsb.cprm.gov.br/index.php/journal/article/view/197 |
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