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• W3154388614 endingPage "1028" @default.
• W3154388614 startingPage "1014" @default.
• W3154388614 abstract "Abstract Throughout the Ediacaran Period, variable water-column redox conditions persisted along productive ocean margins due to a complex interplay between nutrient supply and oceanographic restriction. These changing conditions are considered to have influenced early faunal evolution, with marine anoxia potentially inhibiting the development of the ecological niches necessary for aerobic life forms. To understand this link between oxygenation and evolution, the combined geochemical and palaeontological study of marine sediments is preferable. Located in the Yangtze Gorges region of southern China, lagoonal black shales at Miaohe preserve alga and putative metazoans, including Eoandromeda, a candidate total-group ctenophore, thereby providing one example of where integrated study is possible. We present a multi-proxy investigation into water-column redox variability during deposition of these shales ( c. 560–551 Ma). For this interval, reactive iron partitioning indicates persistent water-column anoxia, while trace metal enrichments and other geochemical data suggest temporal fluctuations between ferruginous, euxinic and rare suboxic conditions. Although trace metal and total organic carbon values imply extensive basin restriction, sustained trace metal enrichment and δ 15 N sed data indicate periodic access to open-ocean inventories across a shallow-marine sill. Lastly, δ 13 C org values of between −35‰ and −40‰ allow at least partial correlation of the shales at Miaohe with Member IV of the Doushantuo Formation. This study provides evidence for fluctuating redox conditions in the lagoonal area of the Yangtze platform during late Ediacaran time. If these low-oxygen environments were regionally characteristic, then the restriction of aerobic fauna to isolated environments can be inferred." @default.
• W3154388614 created "2021-04-26" @default.
• W3154388614 creator A5016038041 @default.
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• W3154388614 creator A5066217134 @default.
• W3154388614 date "2021-04-14" @default.
• W3154388614 modified "2023-09-26" @default.
• W3154388614 title "The Ediacaran ‘Miaohe Member’ of South China: new insights from palaeoredox proxies and stable isotope data" @default.
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