Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics
Abstract Microbialites are the most abundant life evidence in Precambrian sedimentary rocks. They are produced by microbial interaction activity and sedimentary processes reflecting paleoenvironmental conditions. The Ediacaran-Cambrian carbonate and siliciclastic successions in the Southern Amazon C...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Geologia
2022-06-01
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| Series: | Brazilian Journal of Geology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200604&tlng=en |
| _version_ | 1828792003919347712 |
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| author | Afonso César Rodrigues Nogueira Renan Fernandes dos Santos Guilherme Raffaeli Romero José Bandeira Claudio Riccomini Ivan Alfredo Romero Barrera Pedro Augusto Santos da Silva Joelson Lima Soares Thomas Fairchild Anna Andressa Evangelista Nogueira Ana Maria Góes Rick Souza de Oliveira Renato Sol Paiva de Medeiros Luiz Saturnino de Andrade Ailton da Silva Brito Pedro Guilherme Assunção Oliveira Argel de Assis Nunes Sodré Davi Ferreira de Carvalho Werner Truckenbrodt |
| author_facet | Afonso César Rodrigues Nogueira Renan Fernandes dos Santos Guilherme Raffaeli Romero José Bandeira Claudio Riccomini Ivan Alfredo Romero Barrera Pedro Augusto Santos da Silva Joelson Lima Soares Thomas Fairchild Anna Andressa Evangelista Nogueira Ana Maria Góes Rick Souza de Oliveira Renato Sol Paiva de Medeiros Luiz Saturnino de Andrade Ailton da Silva Brito Pedro Guilherme Assunção Oliveira Argel de Assis Nunes Sodré Davi Ferreira de Carvalho Werner Truckenbrodt |
| author_sort | Afonso César Rodrigues Nogueira |
| collection | DOAJ |
| description | Abstract Microbialites are the most abundant life evidence in Precambrian sedimentary rocks. They are produced by microbial interaction activity and sedimentary processes reflecting paleoenvironmental conditions. The Ediacaran-Cambrian carbonate and siliciclastic successions in the Southern Amazon Craton in Central Brazil, provide a key opportunity to understand how the metazoan life coexisted with the microbial communities. The spatial and temporal distribution of microbialites as well as morphological and paleoenvironmental changes have been assessed, reinterpreting previous works and including new data from the Araras-Alto Paraguai and Corumbá basins. The deposition was controlled by subsidence and sea-level changes that affected these basins, considered extensions of epicontinental seas during the Gondwana assembly. The stromatolites are restricted to coastal deposits and experienced thriving flourishment intervals after the Marinoan Glaciation (635 Ma). Post-glacial transgression was marked by microbial colonization in shallow platforms represented by stratiform and giant domical stromatolites in the Araras-Alto Paraguai Basin. The continuity of the transgression generated a moderately deep aragonite sea at about 622 Ma. A progressive sea-level fall caused the implantation of coastal environments under greenhouse conditions with tidal flat and sabkha settings colonized by centimetric-scale stromatolites. The sea retreat was accompanied by progressive uplift, causing a moderate inversion of the basin and erosion of the succession until ~560 Ma with the deposition of the last preserved tidal flat deposits with the occurrence of thrombolites. The subsiding Corumbá Basin was the site of microbially-induced deposition of carbonates in a shallow platform connected to an offshore setting with the proliferation of metazoan straddling the Ediacaran-Cambrian boundary. Microbial communities were restricted to lagoon deposits during the Lower Cambrian transgression in the Araras-Alto Paraguai Basin and the last phase refers to the sea retreat towards southeast, developing a fluvial system connected with the arid and evaporitic tidal flats colonized by microbialites that lasted until the upper Cambrian. Except for the post-glacial stromatolites, the columnar and domal microbialite indicate that the coastal settings dominated the Ediacaran-Cambrian transition. The preservation of microbialites in the post-glacial intervals can be associated with the Mg-Ca-CO3 oversaturation in dolomitic platforms. The rapid calcification and ability to resist the dissolution and replacement have increased the stromatolites’ preservation potential reported here, where its well-preserved occurrence in tidal flats and sabkha occurs due to intense early diagenetic silicification. The change from carbonate accumulation to siliciclastic-rich environments contributed to the demise of microbially-induced strata. In general, the scarce coexistence between coastal stromatolite and metazoan-bearing marine deposits makes it challenging to establish a competitive relationship between these organisms, as previously postulated. |
| first_indexed | 2024-12-12T03:00:39Z |
| format | Article |
| id | doaj.art-d23ace792fde4b819a543fdc42247b02 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-12T03:00:39Z |
| publishDate | 2022-06-01 |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-d23ace792fde4b819a543fdc42247b022022-12-22T00:40:38ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-46922022-06-0152210.1590/2317-4889202220210065Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonicsAfonso César Rodrigues Nogueirahttps://orcid.org/0000-0002-5225-9255Renan Fernandes dos Santoshttps://orcid.org/0000-0002-6068-3814Guilherme Raffaeli Romerohttps://orcid.org/0000-0001-9955-0878José Bandeirahttps://orcid.org/0000-0002-9483-1897Claudio Riccominihttps://orcid.org/0000-0002-7249-5706Ivan Alfredo Romero Barrerahttps://orcid.org/0000-0002-5598-9181Pedro Augusto Santos da Silvahttps://orcid.org/0000-0002-7177-3778Joelson Lima Soareshttps://orcid.org/0000-0003-3683-523XThomas Fairchildhttps://orcid.org/0000-0002-2410-175XAnna Andressa Evangelista Nogueirahttps://orcid.org/0000-0002-6330-4760Ana Maria Góeshttps://orcid.org/0000-0001-8575-1935Rick Souza de Oliveirahttps://orcid.org/0000-0001-7439-4944Renato Sol Paiva de Medeiroshttps://orcid.org/0000-0002-1202-0143Luiz Saturnino de Andradehttps://orcid.org/0000-0001-7168-8787Ailton da Silva Britohttps://orcid.org/0000-0001-9224-5563Pedro Guilherme Assunção Oliveirahttps://orcid.org/0000-0001-9078-1143Argel de Assis Nunes Sodréhttps://orcid.org/0000-0002-5190-9623Davi Ferreira de Carvalhohttps://orcid.org/0000-0003-2977-1426Werner Truckenbrodthttps://orcid.org/0000-0001-7769-5988Abstract Microbialites are the most abundant life evidence in Precambrian sedimentary rocks. They are produced by microbial interaction activity and sedimentary processes reflecting paleoenvironmental conditions. The Ediacaran-Cambrian carbonate and siliciclastic successions in the Southern Amazon Craton in Central Brazil, provide a key opportunity to understand how the metazoan life coexisted with the microbial communities. The spatial and temporal distribution of microbialites as well as morphological and paleoenvironmental changes have been assessed, reinterpreting previous works and including new data from the Araras-Alto Paraguai and Corumbá basins. The deposition was controlled by subsidence and sea-level changes that affected these basins, considered extensions of epicontinental seas during the Gondwana assembly. The stromatolites are restricted to coastal deposits and experienced thriving flourishment intervals after the Marinoan Glaciation (635 Ma). Post-glacial transgression was marked by microbial colonization in shallow platforms represented by stratiform and giant domical stromatolites in the Araras-Alto Paraguai Basin. The continuity of the transgression generated a moderately deep aragonite sea at about 622 Ma. A progressive sea-level fall caused the implantation of coastal environments under greenhouse conditions with tidal flat and sabkha settings colonized by centimetric-scale stromatolites. The sea retreat was accompanied by progressive uplift, causing a moderate inversion of the basin and erosion of the succession until ~560 Ma with the deposition of the last preserved tidal flat deposits with the occurrence of thrombolites. The subsiding Corumbá Basin was the site of microbially-induced deposition of carbonates in a shallow platform connected to an offshore setting with the proliferation of metazoan straddling the Ediacaran-Cambrian boundary. Microbial communities were restricted to lagoon deposits during the Lower Cambrian transgression in the Araras-Alto Paraguai Basin and the last phase refers to the sea retreat towards southeast, developing a fluvial system connected with the arid and evaporitic tidal flats colonized by microbialites that lasted until the upper Cambrian. Except for the post-glacial stromatolites, the columnar and domal microbialite indicate that the coastal settings dominated the Ediacaran-Cambrian transition. The preservation of microbialites in the post-glacial intervals can be associated with the Mg-Ca-CO3 oversaturation in dolomitic platforms. The rapid calcification and ability to resist the dissolution and replacement have increased the stromatolites’ preservation potential reported here, where its well-preserved occurrence in tidal flats and sabkha occurs due to intense early diagenetic silicification. The change from carbonate accumulation to siliciclastic-rich environments contributed to the demise of microbially-induced strata. In general, the scarce coexistence between coastal stromatolite and metazoan-bearing marine deposits makes it challenging to establish a competitive relationship between these organisms, as previously postulated.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200604&tlng=enstromatolitecarbonate platformAraras GroupCorumbá Groupepicontinental sea |
| spellingShingle | Afonso César Rodrigues Nogueira Renan Fernandes dos Santos Guilherme Raffaeli Romero José Bandeira Claudio Riccomini Ivan Alfredo Romero Barrera Pedro Augusto Santos da Silva Joelson Lima Soares Thomas Fairchild Anna Andressa Evangelista Nogueira Ana Maria Góes Rick Souza de Oliveira Renato Sol Paiva de Medeiros Luiz Saturnino de Andrade Ailton da Silva Brito Pedro Guilherme Assunção Oliveira Argel de Assis Nunes Sodré Davi Ferreira de Carvalho Werner Truckenbrodt Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics Brazilian Journal of Geology stromatolite carbonate platform Araras Group Corumbá Group epicontinental sea |
| title | Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics |
| title_full | Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics |
| title_fullStr | Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics |
| title_full_unstemmed | Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics |
| title_short | Ediacaran-Cambrian microbialites of the Southern Amazon Craton: relation with the metazoan rise, sea-level changes, and global tectonics |
| title_sort | ediacaran cambrian microbialites of the southern amazon craton relation with the metazoan rise sea level changes and global tectonics |
| topic | stromatolite carbonate platform Araras Group Corumbá Group epicontinental sea |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000200604&tlng=en |
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