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Provedor de dados:  ArchiMer
País:  France
Título:  The 2.1 Ga Old Francevillian Biota: Biogenicity, Taphonomy and Biodiversity
Autores:  El Albani, Abderrazak
Bengtson, Stefan
Canfield, Donald E.
Riboulleau, Armelle
Bard, Claire Rollion
Macchiarelli, Roberto
Pemba, Lauriss Ngombi
Hammarlund, Emma
Meunier, Alain
Mouele, Idalina Moubiya
Benzerara, Karim
Bernard, Sylvain
Boulvais, Philippe
Chaussidon, Marc
Cesari, Christian
Fontaine, Claude
Chi-fru, Ernest
Garcia Ruiz, Juan Manuel
Gauthier-lafaye, Francois
Mazurier, Arnaud
Pierson-wickmann, Anne Catherine
Rouxel, Olivier
Trentesaux, Alain
Vecoli, Marco
Versteegh, Gerard J. M.
White, Lee
Whitehouse, Martin
Bekker, Andrey
Data:  2014-06
Ano:  2014
Resumo:  The Paleoproterozoic Era witnessed crucial steps in the evolution of Earth's surface environments following the first appreciable rise of free atmospheric oxygen concentrations similar to 2.3 to 2.1 Ga ago, and concomitant shallow ocean oxygenation. While most sedimentary successions deposited during this time interval have experienced thermal overprinting from burial diagenesis and metamorphism, the ca. 2.1 Ga black shales of the Francevillian B Formation (FB2) cropping out in southeastern Gabon have not. The Francevillian Formation contains centimeter-sized structures interpreted as organized and spatially discrete populations of colonial organisms living in an oxygenated marine ecosystem. Here, new material from the FB2 black shales is presented and analyzed to further explore its biogenicity and taphonomy. Our extended record comprises variably sized, shaped, and structured pyritized macrofossils of lobate, elongated, and rodshaped morphologies as well as abundant non-pyritized disk-shaped macrofossils and organic-walled acritarchs. Combined microtomography, geochemistry, and sedimentary analysis suggest a biota fossilized during early diagenesis. The emergence of this biota follows a rise in atmospheric oxygen, which is consistent with the idea that surface oxygenation allowed the evolution and ecological expansion of complex megascopic life.
Tipo:  Text
Idioma:  Inglês

Editor:  Public Library Science
Formato:  application/pdf
Fonte:  Plos One (1932-6203) (Public Library Science), 2014-06 , Vol. 9 , N. 6 , P. e99438
Direitos:  2014 El Albani et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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