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Master's Dissertation
DOI
https://doi.org/10.11606/D.44.2013.tde-18112013-111322
Document
Author
Full name
Luana Pereira Costa de Morais Soares
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Fairchild, Thomas Rich (President)
Lahr, Daniel José Galafasse
Sallun Filho, William
Title in Portuguese
Paleobiologia da Formação Bocaina (Grupo Corumbá), Ediacarano, Mato Grosso do Sul
Keywords in Portuguese
Espectroscopia Raman
Grupo Corumbá
Microbialitos
Microfósseis em forma de vaso
Abstract in Portuguese
O Grupo Corumbá, SW Brasil, documenta uma etapa importante na evolução da vida por causa de seu registro fóssil de microbialitos, microfósseis, e organismos multicelulares indicativos da complexidade cada vez maior da biosfera no final do período Ediacarano. A importância paleobiológica da Formação Bocaina, inserido no meio do Grupo Corumbá, e datado em cerca de 560 Ma, é embasada em sua diversidade de microbialitos e registro de significativo evento fosfogenético, associados a supostos "microfósseis em forma de vaso", semelhantes à tecamebas, interpretadas como os primeiros protistas heterótrofos. Estes fósseis, bem como formas semelhantes reconhecidos em outras unidades geológicas do mundo, precedem o registro da explosão de organismos multicelulares macroscópicos esqueléticos (Cloudina, Corumbella) na formação sobrejacente Tamengo (543 Ma). A morfologia do microbialitos fornece evidências de variação local do nível do mar durante a deposição da Form ação Bocaina. As análises morfológicas e químicas dos microfósseis usando microscopia óptica e eletrônica de varredura, EDS e espectroscopia Raman ajudaram a esclarecer a natureza biológica desses objetos e, assim, contribuir para a compreensão da importância da evolução da vida no Ediacarano, na Formação Bocaina, Grupo Corumbá.
Keywords in English
Corumbá Group
Microbialites
Raman spectroscopy
Vase-shaped microfossils
Abstract in English
The Corumbá Group, SW Brazil, documents an important stage in the evolution of life because of its fossil record of microbialites, microfossils, and early multicellular organisms indicative of the rapidly increasing complexity of the biosphere at the very end of the Ediacaran period. The paleobiological importance of the Bocaina Formation, in middle of the Corumbá Group and dated at about 560 Ma, lies in its diversity of microbialites and its record of a significant phosphogenesis event with associated putative "vase-shaped microfossils", similar to testate amoebae, interpreted as early protistan heterotrophs. Th ese fossils, as well as similar forms recognized in other geologic units in the world precede the record of the explosion of macroscopic multicellular skeletal organisms (Cloudina, Corumbella) in the overlying Tamengo Formation (543 Ma). The morphology of microbialites provides evidence of local sea level variation during deposition of the Bocaina Formation. Morphological and chemical analyses of the microfossils using optical and scanning electron microscopy, EDS and Raman spectroscopy helped clarify the biological nature of these objects and thereby contribute to the understanding of the importance of the Bocaina Formation the evolution of late Ediacaran life in the Corumbá Group.
 
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Publishing Date
2013-11-18
 
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