Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen
Abstract The Paramirim Aulacogen was filled by the Espinhaço and São Francisco supergroups in the period from 1.75 to 0.69 Ga, and suffered partial inversion during the Ediacaran. In the northern sector of the intracontinental domain of the Araçuaí-WestCongo Orogen, six compressive deformational pha...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Geologia
2023-07-01
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| Series: | Brazilian Journal of Geology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892023000200304&lng=en&tlng=en |
| _version_ | 1797783291060813824 |
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| author | Caroline Novais Bitencourt Simone Cerqueira Pereira Cruz |
| author_facet | Caroline Novais Bitencourt Simone Cerqueira Pereira Cruz |
| author_sort | Caroline Novais Bitencourt |
| collection | DOAJ |
| description | Abstract The Paramirim Aulacogen was filled by the Espinhaço and São Francisco supergroups in the period from 1.75 to 0.69 Ga, and suffered partial inversion during the Ediacaran. In the northern sector of the intracontinental domain of the Araçuaí-WestCongo Orogen, six compressive deformational phases were interpreted and associated with the frontal inversion of the Paramirim Aulacogen. Three structural domains were identified: Jacaraci Fold-Thrust Belt, Caetité Nappe, and Transpressive Domain. The nucleation of deformational structures is related to a maximum stress field with general WSW-ENE orientation. The first deformational phase (D1), found in the Jacaraci Fold-Thrust Belt and the Transpressional Domain, is related to the evolution of the Rio Pardo Salient. A dextral transpressional system nucleated the Caetité Nappe. This system also juxtaposed amphibolite facies rocks over lower temperature facies, as well as Statherian over Tonian rocks. Furthermore, this system was responsible for deformation in the transpressional domains and late deformation in the Jacaraci Fold-Thrust Belt. The region presents a variety of structures and is, therefore, an excellent natural laboratory for studying positive inversion in aulacogens. |
| first_indexed | 2024-03-13T00:23:57Z |
| format | Article |
| id | doaj.art-300ebc0705c34705a0c6c4c5982db93c |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-03-13T00:23:57Z |
| publishDate | 2023-07-01 |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-300ebc0705c34705a0c6c4c5982db93c2023-07-11T07:49:28ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-46922023-07-0153210.1590/2317-4889202320220069Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí OrogenCaroline Novais Bitencourthttps://orcid.org/0009-0003-7072-5947Simone Cerqueira Pereira Cruzhttps://orcid.org/0000-0002-9645-1927Abstract The Paramirim Aulacogen was filled by the Espinhaço and São Francisco supergroups in the period from 1.75 to 0.69 Ga, and suffered partial inversion during the Ediacaran. In the northern sector of the intracontinental domain of the Araçuaí-WestCongo Orogen, six compressive deformational phases were interpreted and associated with the frontal inversion of the Paramirim Aulacogen. Three structural domains were identified: Jacaraci Fold-Thrust Belt, Caetité Nappe, and Transpressive Domain. The nucleation of deformational structures is related to a maximum stress field with general WSW-ENE orientation. The first deformational phase (D1), found in the Jacaraci Fold-Thrust Belt and the Transpressional Domain, is related to the evolution of the Rio Pardo Salient. A dextral transpressional system nucleated the Caetité Nappe. This system also juxtaposed amphibolite facies rocks over lower temperature facies, as well as Statherian over Tonian rocks. Furthermore, this system was responsible for deformation in the transpressional domains and late deformation in the Jacaraci Fold-Thrust Belt. The region presents a variety of structures and is, therefore, an excellent natural laboratory for studying positive inversion in aulacogens.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892023000200304&lng=en&tlng=enaulacogenorogentectonic inversioncratondeformational phases |
| spellingShingle | Caroline Novais Bitencourt Simone Cerqueira Pereira Cruz Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen Brazilian Journal of Geology aulacogen orogen tectonic inversion craton deformational phases |
| title | Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen |
| title_full | Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen |
| title_fullStr | Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen |
| title_full_unstemmed | Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen |
| title_short | Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen |
| title_sort | deformational sequence of inversion in the paramirim aulacogen northern region of the intracontinental sector of the aracuai orogen |
| topic | aulacogen orogen tectonic inversion craton deformational phases |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892023000200304&lng=en&tlng=en |
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