Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations

Detalhes bibliográficos
Autor(a) principal: Adôrno, Rodrigo Rodrigues
Data de Publicação: 2019
Tipo de documento: Tese
Idioma: eng
Título da fonte: Repositório Institucional da UnB
Texto Completo: http://repositorio2.unb.br/jspui/handle/10482/47534
Resumo: Tese (doutorado) — Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2019.
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spelling Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formationsTaxonomia, paleocologia e cronobioestratigrafia através do limite Ediacariano-Cambriano : formações Tamengo e GuaicurusEdiacarianoGrupo CorumbáBioestratigrafiaMicropaleontologiaTese (doutorado) — Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2019.This work presents results of the taxonomic study and the stratigraphic distribution of twenty-six species of Tamengo and Guaicurus formations in five sections in the Corumbá and Ladário regions: Corcal and Laginha quarries, Porto Sobramil, Porto Figueiras and Ecoparque Cacimba. In addition, paleoecological and paleoenvironmental inferences are presented based on the occurrence of this fossil assemblage and the updating of the lithostratigraphic description of the sections of upper Corumbá Group. Cloudina carinata Cortijo et al., 2010, had documented occurrences in Spain and Siberia, and now it is presented unprecedented occurrence in America continent, from siltstones of the Tamengo Formation at Porto Figueiras section, Brazil. The studied paelobiota is composed of three biomineralizing metazoan: Cloudina lucianoi (Beurlen & Sommer, 1957), Cloudina carinata, Corumbella werneri Hahn et al., 1982, poriferous spicules, putative sponge gemmule and sessile epibionts prokaryotic-colony Vendotaenia antiqua Gnilovskaya, 1971. The present work also deals with taxonomy and stratigraphic distribution of the four ichnospecies: Gordia marina Emmons, 1844, Pilichnus cf. P. dichotomus Uchman, 1999, Didymaulichnus lyelli (Rouault, 1850) and Multina minima Uchman, 2001 that integrate the updated benthic vagile ichnofauna for upper portion of Corumbá Group. Three vendotaenid species were identified: Vendotaenia antiqua in Tamengo Formation, and two species in Guaicurus Formation: Eoholynia corumbensis Gaucher et al., 2003 and Tawuia dalensis Hofmann, 1979 in (Hofmann & Aitken, 1979). The species diversity of the Tamengo Formation fossil assemblage was complemented by the occurrence of sixteen microfissil species that possibly represented marine planktic, characterized by the permineralized microfossil Chuaria circularis Walcott, 1899 and other fifteen species of small sphaeromorphs organic-walled microfossils: Arctacellularia januarensis Denezine, 2018 nomem nudum, Leiosphaeridia ternata (Timofeev, 1966), Leiosphaeridia crassa (Naumova, 1949), Leiosphaeridia jacutica (Timofeev, 1966), Leiosphaeridia minutissima (Naumova, 1949), Leiosphaeridia tenuissima Eisenack, 1958, Leiosphaeridia obsuleta (Naumova, 1949), Bavlinella faveolata Vidal, 1976, Bambuites erichsenii Sommer, 1971, Synsphaeridium sp., Jacutianema sp., Lophosphaeridium sp., Ostiama microcystis Hermann, 1976 in (Timofeev et al., 1976), Navifusa sp. and Gen. 1 sp. 1. A dramatic changed was identified in paleoenvironmental conditions for deposition of Tamengo and Guaicurus formations. It can be clearly seen that there is a possibility of these changes contributing to the elimination of almost 95% of the paleobiota, including the extinction of the epibenthic metazoan and the disappearance of planktic organic-walled microfossil. Among all twenty-two species restricted to Tamengo Formation, there was only one survivior, the ichnospecies Multina minima that occurs in both of these formations. This local disappearance could be attributed to the global Ediacaran-Cambrian mass extinction. In addition, samples were prepared and analyzed from sections of three countries where organic-walled microfossils were recovered: nine species from the Nomtsas Formation, Namibia; four species from the Tagatiya Guazu Formation, Paraguay; and six species from the Dengying Formation, China. These results increased the scarce record of organic-walled microfossils species from these additional uppermost Ediacaran selected sections. Based on the taxonomic results and the stratigraphic distribution of the species identified from the Tamengo Formation in the Corcal quarry, a biostratigraphic essay consisting of seven biozones was proposed. Based on the complementation of the micropaleontological data for the three additional studied sections, and based on the paleontological record present in the bibliography for other selected sections, the Tamengo Formation biozones could be extended covering fifteen uppermost Ediacaran sections from nine countries: Brazil (four sections), Paraguay (three sections), Uruguay, Argentina, Namibia, China, Russia, Canada, United States and Oman, one section each. The seven biozones proposed were named, from bottom to top: Cloudina Assemblage Superzone that is distributed in all 15 analyzed sections. Inserted in this superzone, there are three biozones: Cloudina lucianoi/Corumbella werneri Interval Zone; Corumbella werneri Range Zone; Corumbellla werneri/Cloudina lucianoi Interval Zone, these three biozones have geographic distribution until the present which is restricted to Brazil and Paraguay. Two subzones are proposed: Bavlinella faveolata-Leiosphaeridia minutissima Assemblage Subzone inserted in the base of Corumbella werneri Range Zone and Vendotaenia antiqua-Cloudina lucianoi Concurrent-Range Subzone at the upper portion of the Corumbella werneri/Cloudina lucianoi Interval Zone. The first subzone spans across Brazil, Argentina, Uruguay, Namibia and China, the second across Brazil, Namibia, China and Siberia. Finally, Eoholynia corumbensis Range Zone was proposed in the base of Guaicurus Formation at Laginha quarry, lowermost Cambrian, which is restricted to Laginha quarry locality so far.Instituto de Geociências (IG)Programa de Pós-Graduação em GeologiaCarmo, Dermeval Aparecido dorodrigo.r.adorno@gmail.comAdôrno, Rodrigo Rodrigues2024-01-27T14:12:32Z2024-01-27T14:12:32Z2024-01-272019-05-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfADÔRNO, Rodrigo Rodrigues. Taxonomy, Paleoecology and Chronobiostratigraphy Across the Ediacaran-Cambrian Boundary: Tamengo And Guaicurus Formations. 2019. 213 f., il. Tese (Doutorado em Geologia) — Universidade de Brasília, Brasília, 2019.http://repositorio2.unb.br/jspui/handle/10482/47534enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UnBinstname:Universidade de Brasília (UnB)instacron:UNB2024-01-27T14:12:32Zoai:repositorio.unb.br:10482/47534Repositório InstitucionalPUBhttps://repositorio.unb.br/oai/requestrepositorio@unb.bropendoar:2024-01-27T14:12:32Repositório Institucional da UnB - Universidade de Brasília (UnB)false
dc.title.none.fl_str_mv Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
Taxonomia, paleocologia e cronobioestratigrafia através do limite Ediacariano-Cambriano : formações Tamengo e Guaicurus
title Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
spellingShingle Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
Adôrno, Rodrigo Rodrigues
Ediacariano
Grupo Corumbá
Bioestratigrafia
Micropaleontologia
title_short Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
title_full Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
title_fullStr Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
title_full_unstemmed Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
title_sort Taxonomy, paleoecology and chronobiostratigraphy across the Ediacaran- Cambrian boundary : Tamengo and Guaicurus formations
author Adôrno, Rodrigo Rodrigues
author_facet Adôrno, Rodrigo Rodrigues
author_role author
dc.contributor.none.fl_str_mv Carmo, Dermeval Aparecido do
rodrigo.r.adorno@gmail.com
dc.contributor.author.fl_str_mv Adôrno, Rodrigo Rodrigues
dc.subject.por.fl_str_mv Ediacariano
Grupo Corumbá
Bioestratigrafia
Micropaleontologia
topic Ediacariano
Grupo Corumbá
Bioestratigrafia
Micropaleontologia
description Tese (doutorado) — Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2019.
publishDate 2019
dc.date.none.fl_str_mv 2019-05-25
2024-01-27T14:12:32Z
2024-01-27T14:12:32Z
2024-01-27
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv ADÔRNO, Rodrigo Rodrigues. Taxonomy, Paleoecology and Chronobiostratigraphy Across the Ediacaran-Cambrian Boundary: Tamengo And Guaicurus Formations. 2019. 213 f., il. Tese (Doutorado em Geologia) — Universidade de Brasília, Brasília, 2019.
http://repositorio2.unb.br/jspui/handle/10482/47534
identifier_str_mv ADÔRNO, Rodrigo Rodrigues. Taxonomy, Paleoecology and Chronobiostratigraphy Across the Ediacaran-Cambrian Boundary: Tamengo And Guaicurus Formations. 2019. 213 f., il. Tese (Doutorado em Geologia) — Universidade de Brasília, Brasília, 2019.
url http://repositorio2.unb.br/jspui/handle/10482/47534
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UnB
instname:Universidade de Brasília (UnB)
instacron:UNB
instname_str Universidade de Brasília (UnB)
instacron_str UNB
institution UNB
reponame_str Repositório Institucional da UnB
collection Repositório Institucional da UnB
repository.name.fl_str_mv Repositório Institucional da UnB - Universidade de Brasília (UnB)
repository.mail.fl_str_mv repositorio@unb.br
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