Preservation in microbial mats: mineralization by a talc-like phase of a fish embedded in a microbial sarcophagus
Entidad
UAM. Departamento de EcologíaEditor
Frontiers MediaFecha de edición
2015-09-04Cita
10.3389/feart.2015.00051
Frontiers in Earth Science 3 (2015): 51
ISSN
2296-6463DOI
10.3389/feart.2015.00051Financiado por
This work, which is part of the research projects CGL2013-42643P and the research grant supporting MI were funded by the Spanish Ministry of Economy and Competitiveness. The SEM facility at IMPMC was supported by Region Ile de France grant SESAME 2006 I-07-593/R, INSU-CNRS, INP-CNRS, and University Pierre et Marie Curie, Paris. SEM analyses performed for this study were supported by a grant from the Foundation Simone et Cino Del Duca (PI: KB). We are also especially grateful to Olivier Beyssac for the help provided for RAMAN analysisProyecto
Gobierno de España. CGL2013-42643PVersión del editor
http://dx.doi.org/10.3389/feart.2015.00051Materias
Mg-silicate biomineralization; Fish preservation; Fossilization; Microbial mat; Experimental taphonomy; Biología y Biomedicina / BiologíaNota
Frontiers in Earth Science 3 (2015): 51 This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permissionDerechos
© 2015 Iniesto, Zeyen, López-Archilla, Bernard, Buscalioni, Guerrero and BenzeraraResumen
Microbial mats have been repeatedly suggested to promote early fossilization of macroorganisms. Yet, experimental simulations of this process remain scarce. Here, we report results of 5 year-long experiments performed onfish carcasses to document the influence of microbial mats on mineral precipitation during early fossilization. Carcasses were initially placed on top of microbial mats. After 2 weeks, fish became coated by the mats forming a compact sarcophagus, which modified the microenvironment close to the corpses. Our results showed that these conditions favored the precipitation of a poorly crystalline silicate phase rich in magnesium. This talc-like mineral phase has been detected in three different locations within the carcasses placed in microbial mats for more than 4 years: (1) within inner tissues, colonized by several bacillary cells; (2) at the surface of bones of the upper face of the corpse buried in the mat; and (3) at the surface of several bones such as the dorsal fin which appeared to be gradually replaced by the Mg-silicate phase. This mineral phase has been previously shown to promote bacteria fossilization. Here we provide first experimental evidence that such Mg-rich phase can also be involved in exceptional preservation of animals
Lista de ficheros
Google Scholar:Iniesto, Miguel
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Zeyen, Nina
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López Archilla, Ana Isabel
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Delgado Buscalioni, Ángela
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Guerrero, M. Carmen
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Benzerara, Karim
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Bernard, Sylvain
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