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

Abstract 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 tis...

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Autores principales:	Annalisa Ferretti, Daniele Malferrari, Luca Medici, Martina Savioli
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/492d08dd940c4ed2abd89da23d57f6ff
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spelling	oai:doaj.org-article:492d08dd940c4ed2abd89da23d57f6ff2021-12-02T12:31:46ZDiagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite10.1038/s41598-017-01694-42045-2322https://doaj.org/article/492d08dd940c4ed2abd89da23d57f6ff2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01694-4https://doaj.org/toc/2045-2322Abstract 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.Annalisa FerrettiDaniele MalferrariLuca MediciMartina SavioliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Annalisa Ferretti Daniele Malferrari Luca Medici Martina Savioli Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite
description	Abstract 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.
format	article
author	Annalisa Ferretti Daniele Malferrari Luca Medici Martina Savioli
author_facet	Annalisa Ferretti Daniele Malferrari Luca Medici Martina Savioli
author_sort	Annalisa Ferretti
title	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_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_sort	diagenesis does not invent anything new: precise replication of conodont structures by secondary apatite
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/492d08dd940c4ed2abd89da23d57f6ff
work_keys_str_mv	AT annalisaferretti diagenesisdoesnotinventanythingnewprecisereplicationofconodontstructuresbysecondaryapatite AT danielemalferrari diagenesisdoesnotinventanythingnewprecisereplicationofconodontstructuresbysecondaryapatite AT lucamedici diagenesisdoesnotinventanythingnewprecisereplicationofconodontstructuresbysecondaryapatite AT martinasavioli diagenesisdoesnotinventanythingnewprecisereplicationofconodontstructuresbysecondaryapatite
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Diagenesis does not invent anything new: Precise replication of conodont structures by secondary apatite

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