气候变化领域集成服务门户(CCPortal): Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China

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DOI	10.1029/2020JB021085
	Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China
	Chen Y.; Zhang W.; Nian X.; Sun Q.; Ge C.; Hutchinson S.M.; Cheng Q.; Wang F.; Chen J.; Zhao X.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Ferrimagnetic greigite (Fe3S4) is widespread in the sedimentary environment. Despite abundant reports of greigite occurrence in marine and lacustrine deposits, its formation mechanisms in deltaic deposits remain poorly studied. Here we investigate greigite in Holocene Yangtze River Delta deposits using granulometric, magnetic, and geochemical methods. The studied cores consist of tidal river, estuary, shallow marine, and delta facies in ascending order. The greigite-bearing layers are found predominantly in the accreting tidal flat facies during the transgression stage and secondarily in the shallow marine facies during the regression stage of the delta's Holocene development. These sedimentary intervals have a higher total sulfur (TS) content and TS to total organic carbon ratios (TS/TOC) suggesting the accumulation of iron sulfides, including greigite, under reducing estuarine and shallow marine conditions. The greigite-bearing layers in the tidal flat facies have lower Sr/Ba ratios, in comparison to the shallow marine facies, indicating a lower salinity environment. Supported by the dating results, it is suggested that the higher sedimentation rate of the tidal flat facies, caused by rapid sea-level rise during the early Holocene, favors the formation and preservation of greigite. Our results indicate that the magnetic detection of greigite provides a simple and useful tool for inferring salinity and sedimentation rate changes, and hence better an understanding of the heterogeneity of depositional processes in Holocene delta environments. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	delta environments; environmental magnetism; greigite; Holocene; salinity change; sedimentation rate; stratigraphy correlation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187299
作者单位	State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; Zhejiang Institute of Hydraulics and Estuary, Hangzhou, China; School of Science, Engineering and Environment, University of Salford, Greater Manchester, United Kingdom; Guangdong Provincial Key Laboratory of Marine Biotechnology, Institute of Marine Sciences, Shantou University, Shantou, China
推荐引用方式 GB/T 7714	Chen Y.,Zhang W.,Nian X.,et al. Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China[J],2021,126(3).
APA	Chen Y..,Zhang W..,Nian X..,Sun Q..,Ge C..,...&Zhao X..(2021).Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Chen Y.,et al."Greigite as an Indicator for Salinity and Sedimentation Rate Change: Evidence From the Yangtze River Delta, China".Journal of Geophysical Research: Solid Earth 126.3(2021).