Origin of pyrite nodules at the top of the nantuo diamictites, Southern China

Abstract Pyrite nodules up to 20 cm in diameter are found at the top of the Marinoan (~ 635 Ma) Nantuo glacial diamictite as well as in the cap dolostones and shale/siltstones in the lower Doushantuo Formation in eastern Guizhou, southern China. Field occurrences, petrography, and stable sulfur isot...

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Autores principales:	Changjie Liu, Ying Lin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/84ff846f1aae491a90a121541ac18f6a
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spelling	oai:doaj.org-article:84ff846f1aae491a90a121541ac18f6a2021-12-02T15:14:48ZOrigin of pyrite nodules at the top of the nantuo diamictites, Southern China10.1038/s41598-021-97022-y2045-2322https://doaj.org/article/84ff846f1aae491a90a121541ac18f6a2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97022-yhttps://doaj.org/toc/2045-2322Abstract Pyrite nodules up to 20 cm in diameter are found at the top of the Marinoan (~ 635 Ma) Nantuo glacial diamictite as well as in the cap dolostones and shale/siltstones in the lower Doushantuo Formation in eastern Guizhou, southern China. Field occurrences, petrography, and stable sulfur isotopic compositions of pyrite nodules were studied from a section at Taoying, eastern Guizhou, China. Pyrite δ34S values from different nodules varied from 7.3 to 60.5‰ at different stratigraphic levels. No stratigraphic trend existed for the δ34S, supporting the scenario of pyrite formation in sediments before the precipitation of the cap dolostone. Pyrite δ34S values were also homogeneous within individual nodules at a 0.3 to 1 cm sampling scale, but were more heterogeneous at a 2 mm sampling scale. Homogeneity was not expected from the particular model for pyrite nodule formation in a largely closed or semi-closed environment. Thus, differential cementation and compaction of the pyrite-bearing sediments may have produced the nodular shape of the pyrite deposit.Changjie LiuYing LinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Changjie Liu Ying Lin Origin of pyrite nodules at the top of the nantuo diamictites, Southern China
description	Abstract Pyrite nodules up to 20 cm in diameter are found at the top of the Marinoan (~ 635 Ma) Nantuo glacial diamictite as well as in the cap dolostones and shale/siltstones in the lower Doushantuo Formation in eastern Guizhou, southern China. Field occurrences, petrography, and stable sulfur isotopic compositions of pyrite nodules were studied from a section at Taoying, eastern Guizhou, China. Pyrite δ34S values from different nodules varied from 7.3 to 60.5‰ at different stratigraphic levels. No stratigraphic trend existed for the δ34S, supporting the scenario of pyrite formation in sediments before the precipitation of the cap dolostone. Pyrite δ34S values were also homogeneous within individual nodules at a 0.3 to 1 cm sampling scale, but were more heterogeneous at a 2 mm sampling scale. Homogeneity was not expected from the particular model for pyrite nodule formation in a largely closed or semi-closed environment. Thus, differential cementation and compaction of the pyrite-bearing sediments may have produced the nodular shape of the pyrite deposit.
format	article
author	Changjie Liu Ying Lin
author_facet	Changjie Liu Ying Lin
author_sort	Changjie Liu
title	Origin of pyrite nodules at the top of the nantuo diamictites, Southern China
title_short	Origin of pyrite nodules at the top of the nantuo diamictites, Southern China
title_full	Origin of pyrite nodules at the top of the nantuo diamictites, Southern China
title_fullStr	Origin of pyrite nodules at the top of the nantuo diamictites, Southern China
title_full_unstemmed	Origin of pyrite nodules at the top of the nantuo diamictites, Southern China
title_sort	origin of pyrite nodules at the top of the nantuo diamictites, southern china
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/84ff846f1aae491a90a121541ac18f6a
work_keys_str_mv	AT changjieliu originofpyritenodulesatthetopofthenantuodiamictitessouthernchina AT yinglin originofpyritenodulesatthetopofthenantuodiamictitessouthernchina
_version_	1718387579620950016

Origin of pyrite nodules at the top of the nantuo diamictites, Southern China

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