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Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite

Conodont elements are important archives of sea/pore water chemistry yet they often exhibit evidence of diagenetic mineral overgrowth which may be biasing measurents. We decided to investigate this phenomenon by characterising chemically and crystallographically, the original biomineral tissue and t...

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Autores principales: Ferretti, Annalisa, Malferrari, Daniele, Medici, Luca, Savioli, Martina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5431664/
https://www.ncbi.nlm.nih.gov/pubmed/28487529
http://dx.doi.org/10.1038/s41598-017-01694-4
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author Ferretti, Annalisa
Malferrari, Daniele
Medici, Luca
Savioli, Martina
author_facet Ferretti, Annalisa
Malferrari, Daniele
Medici, Luca
Savioli, Martina
author_sort Ferretti, Annalisa
collection PubMed
description Conodont elements are important archives of sea/pore water chemistry yet they often exhibit evidence of diagenetic mineral overgrowth which may be biasing measurents. We decided to investigate this phenomenon by characterising chemically and crystallographically, the original biomineral tissue and the diagenetic mineral nature of conodont elements from the Ordovician of Normandy. Diagenetic apatite crystals observed on the surface of conodont elements show distinctive large columnar, blocky or web-like microtextures. We demonstrate that these apatite neo-crystals exhibit the same chemical composition as the original fossil structure. X-ray microdiffraction has been applied herein for the first time to conodont structural investigation. Analyses of the entire conodont element surface of a variety of species have revealed the existence of a clear pattern of crystal preferred orientation. No significant difference in unit cell parameters was documented between the newly formed apatite crystals and those of the smooth conodont surfaces, thus it emerges from our research that diagenesis has strictly replicated the unit cell signature of the older crystals.
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spelling pubmed-54316642017-05-16 Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite Ferretti, Annalisa Malferrari, Daniele Medici, Luca Savioli, Martina Sci Rep Article Conodont elements are important archives of sea/pore water chemistry yet they often exhibit evidence of diagenetic mineral overgrowth which may be biasing measurents. We decided to investigate this phenomenon by characterising chemically and crystallographically, the original biomineral tissue and the diagenetic mineral nature of conodont elements from the Ordovician of Normandy. Diagenetic apatite crystals observed on the surface of conodont elements show distinctive large columnar, blocky or web-like microtextures. We demonstrate that these apatite neo-crystals exhibit the same chemical composition as the original fossil structure. X-ray microdiffraction has been applied herein for the first time to conodont structural investigation. Analyses of the entire conodont element surface of a variety of species have revealed the existence of a clear pattern of crystal preferred orientation. No significant difference in unit cell parameters was documented between the newly formed apatite crystals and those of the smooth conodont surfaces, thus it emerges from our research that diagenesis has strictly replicated the unit cell signature of the older crystals. Nature Publishing Group UK 2017-05-09 /pmc/articles/PMC5431664/ /pubmed/28487529 http://dx.doi.org/10.1038/s41598-017-01694-4 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ferretti, Annalisa
Malferrari, Daniele
Medici, Luca
Savioli, Martina
Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
title Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
title_full Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
title_fullStr Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
title_full_unstemmed Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
title_short Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
title_sort diagenesis does not invent anything new: precise replication of conodont structures by secondary apatite
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5431664/
https://www.ncbi.nlm.nih.gov/pubmed/28487529
http://dx.doi.org/10.1038/s41598-017-01694-4
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