Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry

Abstract The Permian Chert Event is of great significance to understanding the geological evolution of the entire Permian; however, the origin of widespread chert formation is debated. We report new geochemical data from deep-marine siliceous rocks of the upper Permian Da-long Formation, Lower Yangt...

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Autores principales:	Zhi-Wei Liao, Wen-Xuan Hu, Xiu-Gen Fu, Zhong-Ya Hu
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Lower Yangtze region Da-long Formation Siliceous rock Biological chert Volcanism Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/f0d066cba65b468a820620b61dcb6201
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spelling	oai:doaj.org-article:f0d066cba65b468a820620b61dcb62012021-12-02T09:43:33ZGeochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry10.1007/s12182-018-0293-31672-51071995-8226https://doaj.org/article/f0d066cba65b468a820620b61dcb62012018-12-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0293-3https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The Permian Chert Event is of great significance to understanding the geological evolution of the entire Permian; however, the origin of widespread chert formation is debated. We report new geochemical data from deep-marine siliceous rocks of the upper Permian Da-long Formation, Lower Yangtze region, southeastern China. Their geochemical results show that these thin-bedded siliceous rocks have a clear biologic origin, with rare to no evidence of hydrothermal influence. The values of Al/(Al + Fe + Mn) and Eu/Eu* are 0.60–0.84 (mean = 0.72) and 0.45–1.08 (mean = 0.77), respectively, and Mn/Ti ratios are relatively low (mean = 0.72). The correlations of LaN/CeN, LaN/YbN, and Fe2O3/TiO2 with Al2O3/(Al2O3 + Fe2O3), along with the Ce anomaly, indicate that the Da-long siliceous rocks were deposited at a transitional zone between a continental margin and the open ocean; i.e., relatively close to terrestrial sediment input and far from hydrothermal activity. The accumulation of chert is related to its unique paleogeographic location in an equatorial setting with many submarine paleo-highlands. Intense upwelling and frequent local volcanism are the main factors that promoted the development of siliceous rocks in the studied area. Ocean acidification triggered by large-scale volcanism (Large Igneous Province) during the late Permian led to extensive silica precipitation and preservation.Zhi-Wei LiaoWen-Xuan HuXiu-Gen FuZhong-Ya HuKeAi Communications Co., Ltd.articleLower Yangtze regionDa-long FormationSiliceous rockBiological chertVolcanismScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 2, Pp 252-266 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Lower Yangtze region Da-long Formation Siliceous rock Biological chert Volcanism Science Q Petrology QE420-499
spellingShingle	Lower Yangtze region Da-long Formation Siliceous rock Biological chert Volcanism Science Q Petrology QE420-499 Zhi-Wei Liao Wen-Xuan Hu Xiu-Gen Fu Zhong-Ya Hu Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry
description	Abstract The Permian Chert Event is of great significance to understanding the geological evolution of the entire Permian; however, the origin of widespread chert formation is debated. We report new geochemical data from deep-marine siliceous rocks of the upper Permian Da-long Formation, Lower Yangtze region, southeastern China. Their geochemical results show that these thin-bedded siliceous rocks have a clear biologic origin, with rare to no evidence of hydrothermal influence. The values of Al/(Al + Fe + Mn) and Eu/Eu* are 0.60–0.84 (mean = 0.72) and 0.45–1.08 (mean = 0.77), respectively, and Mn/Ti ratios are relatively low (mean = 0.72). The correlations of LaN/CeN, LaN/YbN, and Fe2O3/TiO2 with Al2O3/(Al2O3 + Fe2O3), along with the Ce anomaly, indicate that the Da-long siliceous rocks were deposited at a transitional zone between a continental margin and the open ocean; i.e., relatively close to terrestrial sediment input and far from hydrothermal activity. The accumulation of chert is related to its unique paleogeographic location in an equatorial setting with many submarine paleo-highlands. Intense upwelling and frequent local volcanism are the main factors that promoted the development of siliceous rocks in the studied area. Ocean acidification triggered by large-scale volcanism (Large Igneous Province) during the late Permian led to extensive silica precipitation and preservation.
format	article
author	Zhi-Wei Liao Wen-Xuan Hu Xiu-Gen Fu Zhong-Ya Hu
author_facet	Zhi-Wei Liao Wen-Xuan Hu Xiu-Gen Fu Zhong-Ya Hu
author_sort	Zhi-Wei Liao
title	Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry
title_short	Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry
title_full	Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry
title_fullStr	Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry
title_full_unstemmed	Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry
title_sort	geochemistry of upper permian siliceous rocks from the lower yangtze region, southeastern china: implications for the origin of chert and permian ocean chemistry
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/f0d066cba65b468a820620b61dcb6201
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Geochemistry of upper Permian siliceous rocks from the Lower Yangtze region, southeastern China: implications for the origin of chert and Permian ocean chemistry

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