Deciphering the preservation of fossil insects: A case study from the Crato Member, Early Cretaceous of Brazil
| Autor: | Setembrino Petri, Bruno Becker-Kerber, Tiago Fiorini da Silva, Mírian Liza Alves Forancelli Pacheco, J.F. Curado, Gabriel Ladeira Osés, Marcia de Almeida Rizzutto, Elidiane Cipriano Rangel, Fabio Rodrigues, Guilherme Raffaeli Romero, Douglas Galante, Rafael Parra Ribeiro |
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| Přispěvatelé: | Universidade de São Paulo (USP), Universidade Federal de São Carlos (UFSCar), Fed Univ Para, Brazilian Synchrotron Light Lab, Ctr Univ FEI, Universidade Estadual Paulista (Unesp) |
| Rok vydání: | 2016 |
| Předmět: |
010506 paleontology
Taphonomy lcsh:Medicine Early Cretaceous Lagerstätte engineering.material 010502 geochemistry & geophysics 01 natural sciences General Biochemistry Genetics and Molecular Biology Paleontology Extracellular polymeric substance Crato Member Sulfate-reducing bacteria 0105 earth and related environmental sciences Mineral Pyrite General Neuroscience Exceptional preservation CRETÁCEO lcsh:R General Medicine Paleometry Cretaceous Insects engineering General Agricultural and Biological Sciences Pseudomorph Araripe Basin Entomology Geology |
| Zdroj: | Biblioteca Digital de Teses e Dissertações da FEI Centro Universitário da Fundação Educacional Inaciana (FEI) instacron:FEI PeerJ PeerJ, Vol 4, p e2756 (2016) Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Made available in DSpace on 2018-11-28T01:36:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-12-21 Brazilian Council for Scientific and Technological Development Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Exceptionally well-preserved three-dimensional insects with fine details and even labile tissues are ubiquitous in the Crato Member Konservat Lagerstatte (northeastern Brazil). Here we investigate the preservational pathways which yielded such specimens. We employed high resolution techniques (EDXRF, SR-SXS, SEM, EDS, micro Raman, and PIXE) to understand their fossilisation on mineralogical and geochemical grounds. Pseudomorphs of framboidal pyrite, the dominant fossil microfabric, display size variation when comparing cuticle with inner areas or soft tissues, which we interpret as the result of the balance between ion diffusion rates and nucleation rates of pyrite through the originally decaying carcasses. Furthermore, the mineral fabrics are associated with structures that can be the remains of extracellular polymeric substances (EPS). Geochemical data also point to a concentration of Fe, Zn, and Cu in the fossils in comparison to the embedding rock. Therefore, we consider that biofilms of sulphate reducing bacteria (SRB) had a central role in insect decay and mineralisation. Therefore, we shed light on exceptional preservation of fossils by pyritisation in a Cretaceous limestone lacustrine palaeoenvironment. Univ Sao Paulo, Inst Geosci, Programa Posgrad Geoquim & Geotecton, Sao Paulo, Brazil Univ Sao Paulo, Inst Geosci, Sao Paulo, Brazil Univ Fed Sao Carlos, Programa Posgrad Ecol & Recursos Nat, Sao Carlos, SP, Brazil Fed Univ Para, Inst Geosci, Belem, Para, Brazil Univ Sao Paulo, Inst Phys, Sao Paulo, Brazil Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Sao Paulo, Brazil Brazilian Synchrotron Light Lab, Campinas, SP, Brazil Ctr Univ FEI, Dept Phys, Sao Bernardo Do Campo, Brazil Univ Estadual Paulista, Lab Technol Plasmas, Sorocaba, Brazil Univ Fed Sao Carlos, Dept Biol, Sorocaba, Brazil Univ Estadual Paulista, Lab Technol Plasmas, Sorocaba, Brazil Brazilian Council for Scientific and Technological Development: 154062/2014-6 FAPESP: 2012/18936-0 FAPESP: 2012/00202-0 |
| Databáze: | OpenAIRE |
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