Diagenetic processes in Quaternary fossil bones from tropical limestone caves

Abstract Quaternary fossils from limestone caves bear various diagenetic features due to the complex nature of sedimentary processes. However, few studies have addressed the problem of diagenetic changes in fossils from tropical-wet environments. We study Quaternary fossil bones from different sites...

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Autores principales:	Daniel Vieira de Sousa, Estevan Eltink, Raquel Aline Pessoa Oliveira, Jorlandio Francisco Félix, Luciano de Moura Guimarães
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/915c990646c94c1189293b676c577274
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spelling	oai:doaj.org-article:915c990646c94c1189293b676c5772742021-12-02T12:33:06ZDiagenetic processes in Quaternary fossil bones from tropical limestone caves10.1038/s41598-020-78482-02045-2322https://doaj.org/article/915c990646c94c1189293b676c5772742020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78482-0https://doaj.org/toc/2045-2322Abstract Quaternary fossils from limestone caves bear various diagenetic features due to the complex nature of sedimentary processes. However, few studies have addressed the problem of diagenetic changes in fossils from tropical-wet environments. We study Quaternary fossil bones from different sites of a tropical limestone cave in northeastern Brazil. These fossils show diverse diagenetic features. The approach encompassed the use of scanning electron microscopy, Raman spectroscopy, and X-ray diffraction to understand the modification of the fossil bone structure, chemical composition, and mineral assemblage during the diagenesis processes. We describe a model for fossil diagenesis in tropical limestone caves that involves early and advanced diagenetic stages, which produce two routes with different endmembers. The diagenesis in the cave alters the crystallinity and ordering of hydroxyapatite. The recrystallization of hydroxyapatite appears to be strongly influenced by dripping water that is rich in calcium carbonate, which leads to crystal formation with higher crystallinity. In the absence of calcium carbonate, hydroxyapatite diagenesis involves crystal growth but not necessarily dissolution of the original material, which enables remarkable preservation of the biological structure.Daniel Vieira de SousaEstevan EltinkRaquel Aline Pessoa OliveiraJorlandio Francisco FélixLuciano de Moura GuimarãesNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-16 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Daniel Vieira de Sousa Estevan Eltink Raquel Aline Pessoa Oliveira Jorlandio Francisco Félix Luciano de Moura Guimarães Diagenetic processes in Quaternary fossil bones from tropical limestone caves
description	Abstract Quaternary fossils from limestone caves bear various diagenetic features due to the complex nature of sedimentary processes. However, few studies have addressed the problem of diagenetic changes in fossils from tropical-wet environments. We study Quaternary fossil bones from different sites of a tropical limestone cave in northeastern Brazil. These fossils show diverse diagenetic features. The approach encompassed the use of scanning electron microscopy, Raman spectroscopy, and X-ray diffraction to understand the modification of the fossil bone structure, chemical composition, and mineral assemblage during the diagenesis processes. We describe a model for fossil diagenesis in tropical limestone caves that involves early and advanced diagenetic stages, which produce two routes with different endmembers. The diagenesis in the cave alters the crystallinity and ordering of hydroxyapatite. The recrystallization of hydroxyapatite appears to be strongly influenced by dripping water that is rich in calcium carbonate, which leads to crystal formation with higher crystallinity. In the absence of calcium carbonate, hydroxyapatite diagenesis involves crystal growth but not necessarily dissolution of the original material, which enables remarkable preservation of the biological structure.
format	article
author	Daniel Vieira de Sousa Estevan Eltink Raquel Aline Pessoa Oliveira Jorlandio Francisco Félix Luciano de Moura Guimarães
author_facet	Daniel Vieira de Sousa Estevan Eltink Raquel Aline Pessoa Oliveira Jorlandio Francisco Félix Luciano de Moura Guimarães
author_sort	Daniel Vieira de Sousa
title	Diagenetic processes in Quaternary fossil bones from tropical limestone caves
title_short	Diagenetic processes in Quaternary fossil bones from tropical limestone caves
title_full	Diagenetic processes in Quaternary fossil bones from tropical limestone caves
title_fullStr	Diagenetic processes in Quaternary fossil bones from tropical limestone caves
title_full_unstemmed	Diagenetic processes in Quaternary fossil bones from tropical limestone caves
title_sort	diagenetic processes in quaternary fossil bones from tropical limestone caves
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/915c990646c94c1189293b676c577274
work_keys_str_mv	AT danielvieiradesousa diageneticprocessesinquaternaryfossilbonesfromtropicallimestonecaves AT estevaneltink diageneticprocessesinquaternaryfossilbonesfromtropicallimestonecaves AT raquelalinepessoaoliveira diageneticprocessesinquaternaryfossilbonesfromtropicallimestonecaves AT jorlandiofranciscofelix diageneticprocessesinquaternaryfossilbonesfromtropicallimestonecaves AT lucianodemouraguimaraes diageneticprocessesinquaternaryfossilbonesfromtropicallimestonecaves
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Diagenetic processes in Quaternary fossil bones from tropical limestone caves

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