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A shift in redox conditions near the Ediacaran/Cambrian transition and its possible influence on early animal evolution,CorumbáGroup,Brazil

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Geoscience Frontiers 2024年第4期15卷 148-158页

作者： Fabricio A.Caxito Erik Sperling gabriella fazio Rodrigo Rodrigues Adorno Matheus Denezine Dermeval Aparecido Do Carmo Martino Giorgioni Gabriel J.Uhlein Alcides N.Sial CPMTC Research Center and Programa de Pós-graduação em Geologia Departamento de GeologiaInstituto de GeociênciasUniversidade Federal de Minas GeraisBelo HorizonteMG 31270-901Brazil Department of Earth and Planetary Sciences Doerr School of SustainabilityStanford UniversityCA 94305USA Instituto de Geociências Universidade de BrasíliaBrasíliaDF 70910-900Brazil Center for Applied Geosciences(CGA)of the Geological Survey of Brazil(SBG/CPRM) BrasíliaDistrito Federal 70040-904Brazil NEG LABISE Universidade Federal de PernambucoRecife-PE 50740-530Brazil

The Ediacaran-Cambrian transition witnessed some of the most important biological,tectonic,climatic and geochemical changes in Earth's *** utmost importance for early animal evolution is the likely shift in redox conditions of bottom waters,which might have taken place in distinct pulses during the late Ediacaran and early *** track redox changes during this transition,we present new trace element,total organic carbon and both inorganic and organic carbon isotopes,and the first iron speciation data on the Tamengo and Guaicurus formations of the CorumbáGroup in western Brazil,which record important paleobiological changes between 555 Ma to<541 *** stratigraphically older Tamengo Formation is composed mainly of limestone with interbedded marls and mudrocks,and bears fragments of upper Ediacaran biomineralized fossils such as Cloudina lucianoi and Corumbella *** younger Guaicurus Formation represents a regional transgression of the shallow carbonate platform and is composed of a homogeneous fine-grained siliciclastic succession,bearing meiofaunal bilateral *** new iron speciation data reveal predominantly anoxic and ferruginous(non-sulfidic)bottom water conditions during deposition of the Tamengo Formation,with FeHR/FeT around 0.8 and FePy/FeHR below *** transition from the Tamengo to the Guaicurus Formation is marked by a stratigraphically rapid drop in FeHR/FeT to below 0.2,recording a shift to likely oxic bottom waters,which persist ***-sensitive element(RSE)concentrations are muted in both formations,but consistent with non-sulfidic bottom water conditions *** interpret the collected data to reflect a transition between two distinct paleoenvironmental *** Tamengo Formation represents an environment with anoxic bottom waters,with fragments of biomineralized organisms that lived on shallower,proba-bly mildly oxygenated surficial waters,and that were then transported *** to coeval suc

关键词： Atmospheric oxygenation Gondwana Redox proxies Iron speciation Ediacaran biota Redox-sensitive elements

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