The role of volcanic-derived clays in the preservation of Ediacaran biota from the Itajai Basin (ca. 563 Ma, Brazil)

Autor(es):Mostrar menos -

Becker-Kerber, Bruno ^{[1, 2]} ; El Albani, Abderrazak ^[1] ; Konhauser, Kurt ^[3] ; Abd Elmola, Ahmed ^[1] ; Fontaine, Claude ^[1] ; Paim, Paulo S. G. ^[4] ; Mazurier, Arnaud ^[1] ; Prado, Gustavo M. E. M. ^[5] ; Galante, Douglas ^[6] ; Kerber, Pedro B. ^[7] ; da Rosa, Ana L. Z. ^[8] ; Fairchild, Thomas R. ; Meunier, Alain ^[1] ; Pacheco, Mirian L. A. F. ^{[9, 10]}

Afiliação do(s) autor(es)

^[1] Univ Poitiers, Ctr Natl Rech Sci CNRS, Unite Mixte Rech UMR, IC2MP 7285, F-86073 Poitiers - France

^[2] Univ Fed Sao Carlos, Programa Posgrad Ecol & Recursos Nat, 325km, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Alberta, Edmonton, AB - Canada

^[4] Univ Vale Rio dos Sinos, Programa Posgrad Geol, BR-93022750 Sao Leopoldo, RS - Brazil

^[5] Univ Sao Paulo, Inst Geociencias, Rua Lago, 562, Cidade Univ, BR-05508080 Sao Paulo, SP - Brazil

^[6] Brazilian Ctr Res Energy & Mat, Brazilian Synchrotron Light Lab LNLS, Ave Giuseppe Maximo Scolfaro 10000, BR-13083100 Campinas - Brazil

^[7] Univ Fed Mato Grosso do Sul, Inst Quim, Cidade Univ, Ave Costa & Silva Pioneiros, BR-79070900 Campo Grande 79070900, MS - Brazil

^[8] Petrobras SA, Santos, SP - Brazil

^[9] Univ Sao Paulo, Inst Fis, Rua Matao, Travessa R 187, BR-05508090 Sao Paulo - Brazil

^[10] Univ Fed Sao Carlos, Dept Biol, Campus Sorocaba, Rod Joao Leme Santos Km 110, BR-18052780 Sorocaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 11, n. 1 MAR 3 2021.
• Citações Web of Science: 0

Resumo

The early evolution of metazoans has been reconstructed by studies on exceptionally preserved molds in siliciclastic rocks from the Ediacaran Period. However, there remains considerable controversy regarding the formation mechanisms of this unusual `Ediacaran-style' preservation. Proposed hypotheses usually include early authigenesis of minerals, but evidence for this is scarce. In a recently discovered deposit of Ediacaran biota in Brazil, we show that the classic moldic preservation is related to clay mineral authigenesis. Specifically, these clays originated from the alteration of original pyroclastic sediments, likely enhanced by microbial activity, leading to early illitization and morphological templating of the fossiliferous surfaces at a micrometric scale. Such high-fidelity preservation was made possible by rapid burial during volcanic events and the in-situ templating of tissue by clays via microbially-mediated mineralization. This newly described Lagerstatte demonstrates that a number of minerals can facilitate preservation, and that perhaps `Ediacaran-style' preservation result from different processes leading to the same broad style of preservation. (AU)

• Processo FAPESP: 18/21886-0 - O alvorecer de ecossistemas complexos: desvendando e comparando aspectos de preservação excepcional entre as paleobiotas de Itajaí (Ediacarano, Brasil) e Francevillian (Paleoproterozóico, Gabão)
• Beneficiário: Bruno Becker Kerber
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 16/01827-4 - Paleobiologia da Bacia de Itajaí (Ediacarano? Santa Catarina): implicações evolutivas e paleoecológicas
• Beneficiário: Bruno Becker Kerber
• Modalidade de apoio: Bolsas no Brasil - Doutorado