Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study
Abstract The Corumbá Group is a Neoproterozoic succession of terrigenous and carbonate sedimentary rocks located at the southern Paraguay Belt, central Brazil. The upper units of the Corumbá Group include the Ediacaran carbonate Bocaina and Tamengo formations, whose limit is characterized by polymic...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sociedade Brasileira de Geologia
2022-06-01
|
| Series: | Brazilian Journal of Geology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200603&tlng=en |
| _version_ | 1818531667813335040 |
|---|---|
| author | Henrique Albuquerque Fernandes Paulo César Boggiani Jhon Willy Lopes Afonso Kamilla Borges Amorim Ricardo Ivan Ferreira Trindade |
| author_facet | Henrique Albuquerque Fernandes Paulo César Boggiani Jhon Willy Lopes Afonso Kamilla Borges Amorim Ricardo Ivan Ferreira Trindade |
| author_sort | Henrique Albuquerque Fernandes |
| collection | DOAJ |
| description | Abstract The Corumbá Group is a Neoproterozoic succession of terrigenous and carbonate sedimentary rocks located at the southern Paraguay Belt, central Brazil. The upper units of the Corumbá Group include the Ediacaran carbonate Bocaina and Tamengo formations, whose limit is characterized by polymictic breccias recognized in several sites from Corumbá to Serra da Bodoquena, Mato Grosso do Sul. Despite the widespread occurrence, the breccias are poorly described and their origin is uncertain. The aim of this study is to present the differences between sedimentary and tectonic breccias of the Corumbá Group and propose a genesis model for each. The sedimentary breccias comprise mainly matrix-supported chaotic facies that formed by submarine mass flows on slope aprons. Sea level fall and/or increased faulting rates exposed the underlying units and triggered the gravity fluxes by creating a steep slope. The base of the sedimentary breccia represents a major unconformity within the carbonate sedimentation of the Corumbá Group, with potential correlation to other Ediacaran units. The subsequent development of the Paraguay fold-thrust belt caused the formation of tectonic breccias in reverse fault zones. Cataclasis and mylonitization deformed the dolomitic host rock by fracturing and produced a fine foliated matrix. |
| first_indexed | 2024-12-11T17:35:26Z |
| format | Article |
| id | doaj.art-2b96da375da649af8f25a187e8f84b5e |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-11T17:35:26Z |
| publishDate | 2022-06-01 |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-2b96da375da649af8f25a187e8f84b5e2022-12-22T00:56:41ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-46922022-06-0152210.1590/2317-4889202220210062Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative studyHenrique Albuquerque Fernandeshttps://orcid.org/0000-0003-3951-5434Paulo César Boggianihttps://orcid.org/0000-0002-8355-6228Jhon Willy Lopes Afonsohttps://orcid.org/0000-0002-5036-8968Kamilla Borges Amorimhttps://orcid.org/0000-0002-5031-402XRicardo Ivan Ferreira Trindadehttps://orcid.org/0000-0001-9848-9550Abstract The Corumbá Group is a Neoproterozoic succession of terrigenous and carbonate sedimentary rocks located at the southern Paraguay Belt, central Brazil. The upper units of the Corumbá Group include the Ediacaran carbonate Bocaina and Tamengo formations, whose limit is characterized by polymictic breccias recognized in several sites from Corumbá to Serra da Bodoquena, Mato Grosso do Sul. Despite the widespread occurrence, the breccias are poorly described and their origin is uncertain. The aim of this study is to present the differences between sedimentary and tectonic breccias of the Corumbá Group and propose a genesis model for each. The sedimentary breccias comprise mainly matrix-supported chaotic facies that formed by submarine mass flows on slope aprons. Sea level fall and/or increased faulting rates exposed the underlying units and triggered the gravity fluxes by creating a steep slope. The base of the sedimentary breccia represents a major unconformity within the carbonate sedimentation of the Corumbá Group, with potential correlation to other Ediacaran units. The subsequent development of the Paraguay fold-thrust belt caused the formation of tectonic breccias in reverse fault zones. Cataclasis and mylonitization deformed the dolomitic host rock by fracturing and produced a fine foliated matrix.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200603&tlng=enEdiacaransedimentary brecciafault brecciaTamengo FormationCorumbá Group |
| spellingShingle | Henrique Albuquerque Fernandes Paulo César Boggiani Jhon Willy Lopes Afonso Kamilla Borges Amorim Ricardo Ivan Ferreira Trindade Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study Brazilian Journal of Geology Ediacaran sedimentary breccia fault breccia Tamengo Formation Corumbá Group |
| title | Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study |
| title_full | Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study |
| title_fullStr | Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study |
| title_full_unstemmed | Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study |
| title_short | Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study |
| title_sort | sedimentary and tectonic breccias at the base of the ediacaran tamengo formation corumba group a comparative study |
| topic | Ediacaran sedimentary breccia fault breccia Tamengo Formation Corumbá Group |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200603&tlng=en |
| work_keys_str_mv | AT henriquealbuquerquefernandes sedimentaryandtectonicbrecciasatthebaseoftheediacarantamengoformationcorumbagroupacomparativestudy AT paulocesarboggiani sedimentaryandtectonicbrecciasatthebaseoftheediacarantamengoformationcorumbagroupacomparativestudy AT jhonwillylopesafonso sedimentaryandtectonicbrecciasatthebaseoftheediacarantamengoformationcorumbagroupacomparativestudy AT kamillaborgesamorim sedimentaryandtectonicbrecciasatthebaseoftheediacarantamengoformationcorumbagroupacomparativestudy AT ricardoivanferreiratrindade sedimentaryandtectonicbrecciasatthebaseoftheediacarantamengoformationcorumbagroupacomparativestudy |