{"refrec":{"BRefID":337633,"RR":"<b>Bruggmann, S.; Rodler, A.S.; Klaebe, R.M.; Goderis, S.; Frei, R.</b> (2020). Chromium isotope systematics in modern and ancient microbialites. <i>Minerals 10(10)</i>: 928. <a href=\"https://hdl.handle.net/10.3390/min10100928\" target=\"_blank\">https://hdl.handle.net/10.3390/min10100928</a>","BEntID":334257,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Minerals 10(10)</i>: 928. <a href=\"https://hdl.handle.net/10.3390/min10100928\" target=\"_blank\">https://hdl.handle.net/10.3390/min10100928</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Bruggmann, S.; Rodler, A.S.; Klaebe, R.M.; Goderis, S.; Frei, R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Bruggmann, S. <i>et al.</i>","Englishabstract":"Changes in stable chromium isotopes (denoted as δ<sup>53</sup>Cr) in ancient carbonate sediments are increasingly used to reconstruct the oxygenation history in Earth’s atmosphere and oceans through time. As a significant proportion of marine carbonate older than the Cambrian is microbially-mediated, the utility of δ<sup>53</sup>Cr values in ancient carbonates hinges on whether these sediments accurately capture the isotope composition of their environment. We report Cr concentrations (Cr) and δ<sup>53</sup>Cr values of modern marginal marine and non-marine microbial carbonates. These data are supported by stable C and O isotope compositions, as well as rare earth elements and yttrium (REY) concentrations. In addition, we present data on ancient analogs from Precambrian strata. Microbial carbonates from Marion Lake (Australia, δ<sup>53</sup>Cr ≈ 0.99‰) and Mono Lake (USA, ≈0.78‰) display significantly higher δ<sup>53</sup>Cr values compared with ancient microbialites from the Andrée Land Group in Greenland (720 Ma, ≈0.36‰) and the Bitter Springs Formation in Australia (800 Ma, ≈−0.12‰). The δ<sup>53</sup>Cr values are homogenous within microbialite specimens and within individual study sites. This indicates that biological parameters, such as vital effects, causing highly variable δ<sup>53</sup>Cr values in skeletal carbonates, do not induce variability in δ<sup>53</sup>Cr values in microbialites. Together with stable C and O isotope compositions and REY patterns, δ<sup>53</sup>Cr values in microbialites seem to be driven by environmental parameters such as background lithology and salinity. In support, our Cr and δ<sup>53</sup>Cr results of ancient microbial carbonates agree well with data of abiotically precipitated carbonates of the Proterozoic. If detrital contamination is carefully assessed, microbialites have the potential to record the δ<sup>53</sup>Cr values of the waters from which they precipitated. However, it remains unclear if these δ<sup>53</sup>Cr values record (paleo-) redox conditions or rather result from other physico-chemical parameters.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Chromium isotope systematics in modern and ancient microbialites","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Cr isotopes; C isotopes; O isotopes; rare earth elements; Proterozoic; carbonates","OtherDescriptors":null,"Notes":null,"AnaPub":2020,"MonPub":null,"DateUpdate":"2021-05-19","DateCreate":"2021-05-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000585077900001","VABBcode":null,"OpenAcc":1,"Handle":"10.3390/min10100928"},"refs":null,"anarec":{"AnaID":337633,"PubliDate":2020,"Pagination":"928","XtraPublOfAnaID":null,"ISBN":null,"Volume":"10","Issue":"10","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":247426,"SerRR":"Minerals. 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