Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina

Abstract Cloudina is a globally distributed Ediacaran metazoan, with a tubular, funnel-in-funnel form built of thin laminae (ca. 1–10 μm). To what degree local environmental controlled morphology, and whether early diagenesis controlled the degree of calcification of Cloudina, is debated. Here we te...

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Autores principales:	Amy Shore, Rachel Wood
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b935e11fc63d4364960edd42f48387fa
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spelling	oai:doaj.org-article:b935e11fc63d4364960edd42f48387fa2021-12-02T17:30:34ZEnvironmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina10.1038/s41598-021-90768-52045-2322https://doaj.org/article/b935e11fc63d4364960edd42f48387fa2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90768-5https://doaj.org/toc/2045-2322Abstract Cloudina is a globally distributed Ediacaran metazoan, with a tubular, funnel-in-funnel form built of thin laminae (ca. 1–10 μm). To what degree local environmental controlled morphology, and whether early diagenesis controlled the degree of calcification of Cloudina, is debated. Here we test these hypotheses by considering assemblages from four, coeval localities from the Upper Omkyk Member, Nama Group, Namibia, from inner ramp to mid-ramp reef across the Zaris Subbasin. We show that sinuosity of the Cloudina tube is variable between sites, as is the relative thickness of the tube wall, suggesting these features were environmentally controlled. Walls are thickest in high-energy reef settings, and thinnest in the low-energy, inner ramp. While local diagenesis controls preservation, all diagenetic expressions are consistent with the presence of weakly calcified, organic-rich laminae, and lamina thicknesses are broadly constant. Finally, internal ‘cements’ within Cloudina are found in all sites, and pre-date skeletal breakage, transport, as well as syn-sedimentary botryoidal cement precipitation. Best preservation shows these to be formed by fine, pseudomorphed aragonitic acicular crystals. Sr concentrations and Mg/Ca show no statistically significant differences between internal Cloudina cements and botryoidal cements, but we infer all internal cements to have precipitated when Cloudina was still in-situ and added considerable mechanical strength, but may have formed post-mortem or in abandoned parts of the skeleton.Amy ShoreRachel WoodNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Amy Shore Rachel Wood Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina
description	Abstract Cloudina is a globally distributed Ediacaran metazoan, with a tubular, funnel-in-funnel form built of thin laminae (ca. 1–10 μm). To what degree local environmental controlled morphology, and whether early diagenesis controlled the degree of calcification of Cloudina, is debated. Here we test these hypotheses by considering assemblages from four, coeval localities from the Upper Omkyk Member, Nama Group, Namibia, from inner ramp to mid-ramp reef across the Zaris Subbasin. We show that sinuosity of the Cloudina tube is variable between sites, as is the relative thickness of the tube wall, suggesting these features were environmentally controlled. Walls are thickest in high-energy reef settings, and thinnest in the low-energy, inner ramp. While local diagenesis controls preservation, all diagenetic expressions are consistent with the presence of weakly calcified, organic-rich laminae, and lamina thicknesses are broadly constant. Finally, internal ‘cements’ within Cloudina are found in all sites, and pre-date skeletal breakage, transport, as well as syn-sedimentary botryoidal cement precipitation. Best preservation shows these to be formed by fine, pseudomorphed aragonitic acicular crystals. Sr concentrations and Mg/Ca show no statistically significant differences between internal Cloudina cements and botryoidal cements, but we infer all internal cements to have precipitated when Cloudina was still in-situ and added considerable mechanical strength, but may have formed post-mortem or in abandoned parts of the skeleton.
format	article
author	Amy Shore Rachel Wood
author_facet	Amy Shore Rachel Wood
author_sort	Amy Shore
title	Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina
title_short	Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina
title_full	Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina
title_fullStr	Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina
title_full_unstemmed	Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina
title_sort	environmental and diagenetic controls on the morphology and calcification of the ediacaran metazoan cloudina
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b935e11fc63d4364960edd42f48387fa
work_keys_str_mv	AT amyshore environmentalanddiageneticcontrolsonthemorphologyandcalcificationoftheediacaranmetazoancloudina AT rachelwood environmentalanddiageneticcontrolsonthemorphologyandcalcificationoftheediacaranmetazoancloudina
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Environmental and diagenetic controls on the morphology and calcification of the Ediacaran metazoan Cloudina

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