{"refrec":{"BRefID":391437,"RR":"<b>Fernandes, H.A.; Boggiani, P.C.; Viana, A.Z.; Caetano-Filho, S.; Pereira, L.G.; Freitas, B.T.; Hippert, J.P.; Morais, L.; Trindade, R.I.F.</b> (2024). New advances on the carbon isotope and rare earth elements chemostratigraphy of the late Ediacaran Tamengo Formation (Corumba Group, Brazil). <i>J. South Am. Earth Sci. 133</i>: 104696. <a href=\"https://dx.doi.org/10.1016/j.jsames.2023.104696\" target=\"_blank\">https://dx.doi.org/10.1016/j.jsames.2023.104696</a>","BEntID":389184,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>J. South Am. Earth Sci. 133</i>: 104696. <a href=\"https://dx.doi.org/10.1016/j.jsames.2023.104696\" target=\"_blank\">https://dx.doi.org/10.1016/j.jsames.2023.104696</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fernandes, H.A.; Boggiani, P.C.; Viana, A.Z.; Caetano-Filho, S.; Pereira, L.G.; Freitas, B.T.; Hippert, J.P.; Morais, L.; Trindade, R.I.F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fernandes, H.A. <i>et al.</i>","Englishabstract":"The Tamengo Formation (Corumb &amp; aacute; Group, midwest Brazil) is a carbonate-dominated succession of major importance to unravel the environmental and biological changes during the Ediacaran-Cambrian transition in Gondwana. Although it has been extensively studied in terms of sedimentology, isotope geochemistry, biostratigraphy, and geochronology, these studies are constrained to the Corumb &amp; aacute; region. This work presents new sedimentological, C and O isotope chemostratigraphy, and rare earth elements (REE) plus yttrium (REY) data of four sections of the Tamengo Formation in the Serra da Bodoquena region, approximately 200 km south of Corumb &amp; aacute;, discussing how these new data are related to the type sections. The sections present ooid grainstones, with hummocky, swaley, and wavy structures, interbedded with mudstones and shales, indicating deposition of fine particles by suspension fallout in-between periods of high-energy, with reworking by storm waves. The delta C-13(carb) curves show positive plateaus with minor, short-lived negative excursions linked to facies variations, which are related to a large delta C-13(carb) depth gradient in a redox-stratified water column. The REY profiles present middle REE (MREE)-bulge patterns and absent to slightly positive Ce anomalies, consistent with MREE adsorption onto Fe-Mn oxyhydroxides in the water column followed by release in pore waters. Subsequently, REY remobilization during anoxic diagenetic stages resulted in the MREE-bulge pattern and overprinted some of the original seawater REY features, including the Ce anomalies. The Tamengo Formation in the Serra da Bodoquena region represents a storm-dominated carbonate ramp, as previously interpreted for this unit in the Corumb &amp; aacute; region. Nevertheless, there is a significant shift of 2 parts per thousand in the peaks of delta C-13(carb) data between both localities, which may be related to differences in the overall sector of the carbonate ramp. There are also substantial variations in the delta C-13(carb) record of the Tamengo Formation and other coeval Gondwana basins, such as the Nama and Itapucumi groups, with different peak values, which may be related to latitudinal differences on the inorganic carbon isotope composition or to the degree of basin restriction.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"New advances on the carbon isotope and rare earth elements chemostratigraphy of the late Ediacaran Tamengo Formation (Corumba Group, Brazil)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-05-03 01:33:09.737457","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Corumb ' a Group; Tamengo Formation; Carbon isotopes; Rare earth elements; Chemostratigraphy","OtherDescriptors":null,"Notes":null,"AnaPub":2024,"MonPub":null,"DateUpdate":"2024-03-26","DateCreate":"2024-03-26","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:001131583300001","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.jsames.2023.104696"},"refs":null,"anarec":{"AnaID":391437,"PubliDate":2024,"Pagination":"104696","XtraPublOfAnaID":null,"ISBN":null,"Volume":"133","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":231896,"SerRR":"Journal of South American Earth Sciences. 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