Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters

Abstract Precambrian cellular remains frequently have simple morphologies, micrometric dimensions and are poorly preserved, imposing severe analytical and interpretational challenges, especially for irrefutable attestations of biogenicity. The 1.88 Ga Gunflint biota is a Precambrian microfossil asse...

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Autores principales:	L. Maldanis, K. Hickman-Lewis, M. Verezhak, P. Gueriau, M. Guizar-Sicairos, P. Jaqueto, R. I. F. Trindade, A. L. Rossi, F. Berenguer, F. Westall, L. Bertrand, D. Galante
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/24924b0ea98945b798cacf2ed6ef2501
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spelling	oai:doaj.org-article:24924b0ea98945b798cacf2ed6ef25012021-12-02T14:58:53ZNanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters10.1038/s41598-020-65176-w2045-2322https://doaj.org/article/24924b0ea98945b798cacf2ed6ef25012020-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-65176-whttps://doaj.org/toc/2045-2322Abstract Precambrian cellular remains frequently have simple morphologies, micrometric dimensions and are poorly preserved, imposing severe analytical and interpretational challenges, especially for irrefutable attestations of biogenicity. The 1.88 Ga Gunflint biota is a Precambrian microfossil assemblage with different types and qualities of preservation across its numerous geological localities and provides important insights into the Proterozoic biosphere and taphonomic processes. Here we use synchrotron-based ptychographic X-ray computed tomography to investigate well-preserved carbonaceous microfossils from the Schreiber Beach locality as well as poorly-preserved, iron-replaced fossil filaments from the Mink Mountain locality, Gunflint Formation. 3D nanoscale imaging with contrast based on electron density allowed us to assess the morphology and carbonaceous composition of different specimens and identify the minerals associated with their preservation based on retrieved mass densities. In the Mink Mountain filaments, the identification of mature kerogen and maghemite rather than the ubiquitously described hematite indicates an influence from biogenic organics on the local maturation of iron oxides through diagenesis. This non-destructive 3D approach to microfossil composition at the nanoscale within their geological context represents a powerful approach to assess the taphonomy and biogenicity of challenging or poorly preserved traces of early microbial life, and may be applied effectively to extraterrestrial samples returned from upcoming space missions.L. MaldanisK. Hickman-LewisM. VerezhakP. GueriauM. Guizar-SicairosP. JaquetoR. I. F. TrindadeA. L. RossiF. BerenguerF. WestallL. BertrandD. GalanteNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Maldanis K. Hickman-Lewis M. Verezhak P. Gueriau M. Guizar-Sicairos P. Jaqueto R. I. F. Trindade A. L. Rossi F. Berenguer F. Westall L. Bertrand D. Galante Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
description	Abstract Precambrian cellular remains frequently have simple morphologies, micrometric dimensions and are poorly preserved, imposing severe analytical and interpretational challenges, especially for irrefutable attestations of biogenicity. The 1.88 Ga Gunflint biota is a Precambrian microfossil assemblage with different types and qualities of preservation across its numerous geological localities and provides important insights into the Proterozoic biosphere and taphonomic processes. Here we use synchrotron-based ptychographic X-ray computed tomography to investigate well-preserved carbonaceous microfossils from the Schreiber Beach locality as well as poorly-preserved, iron-replaced fossil filaments from the Mink Mountain locality, Gunflint Formation. 3D nanoscale imaging with contrast based on electron density allowed us to assess the morphology and carbonaceous composition of different specimens and identify the minerals associated with their preservation based on retrieved mass densities. In the Mink Mountain filaments, the identification of mature kerogen and maghemite rather than the ubiquitously described hematite indicates an influence from biogenic organics on the local maturation of iron oxides through diagenesis. This non-destructive 3D approach to microfossil composition at the nanoscale within their geological context represents a powerful approach to assess the taphonomy and biogenicity of challenging or poorly preserved traces of early microbial life, and may be applied effectively to extraterrestrial samples returned from upcoming space missions.
format	article
author	L. Maldanis K. Hickman-Lewis M. Verezhak P. Gueriau M. Guizar-Sicairos P. Jaqueto R. I. F. Trindade A. L. Rossi F. Berenguer F. Westall L. Bertrand D. Galante
author_facet	L. Maldanis K. Hickman-Lewis M. Verezhak P. Gueriau M. Guizar-Sicairos P. Jaqueto R. I. F. Trindade A. L. Rossi F. Berenguer F. Westall L. Bertrand D. Galante
author_sort	L. Maldanis
title	Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
title_short	Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
title_full	Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
title_fullStr	Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
title_full_unstemmed	Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
title_sort	nanoscale 3d quantitative imaging of 1.88 ga gunflint microfossils reveals novel insights into taphonomic and biogenic characters
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/24924b0ea98945b798cacf2ed6ef2501
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Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters

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