{"refrec":{"BRefID":257428,"RR":"<b>Delvigne, C.; Cardinal, D.; Hofmann, A.; André, L.</b> (2012). Stratigraphic changes of Ge/Si, REE+Y and silicon isotopes as insights into the deposition of a Mesoarchaean banded iron formation. <i>Earth Planet. Sci. Lett. 355-356</i>: 109-118. <a href=\"https://dx.doi.org/10.1016/j.epsl.2012.07.035\" target=\"_blank\">https://dx.doi.org/10.1016/j.epsl.2012.07.035</a>","BEntID":249437,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Earth Planet. Sci. Lett. 355-356</i>: 109-118. <a href=\"https://dx.doi.org/10.1016/j.epsl.2012.07.035\" target=\"_blank\">https://dx.doi.org/10.1016/j.epsl.2012.07.035</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Delvigne, C.; Cardinal, D.; Hofmann, A.; André, L.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Delvigne, C. <i>et al.</i>","Englishabstract":"In order to determine the origin of silicon (Si) in banded iron formation (BIF), we have undertaken a multi-tracer study combining REE+Y data, Ge/Si ratios and Si isotopes (d<sup>30</sup>Si) on stratigraphically resolved layers from a ~2.95 Ga BIF from the Pongola Supergroup, South Africa. Si in both Si-rich and Fe-rich layers has a common origin, represented by a seawater reservoir strongly influenced by continent-derived freshwaters (~10%) and very limited (<0.1%) high-T hydrothermal fluids as indicated by Eu anomalies and Y/Ho ratios. The coevolution of d<sup>30</sup>Si signatures of Si- and Fe-rich layers of the BIF coupled with similar Eu and Y anomalies in both types of layers is in accordance with a common silica precipitation promoted by Si adsorption onto Fe-oxyhydroxides from Archaean seawater. An increase in d<sup>30</sup>Si values from -2.27‰ to -0.53‰ stratigraphically upwards in the BIF is inferred to be the result of two successive isotopic fractionation processes during (1) silicon adsorption onto the Fe-oxyhydroxide precursor and (2) silica precipitation at the sediment–water interface from pore fluid triggered by the local silica saturation consecutive to an early diagenetic Si desorption from the precursor Fe-oxyhydroxide. The first fractionation process depleted the parental water in <sup>28</sup>Si while the second released <sup>30</sup>Si back into the parental water, resulting in an increase of the d<sup>30</sup>Si value of the parental water reservoir over time.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Stratigraphic changes of Ge/Si, REE+Y and silicon isotopes as insights into the deposition of a Mesoarchaean banded iron formation","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:31:58.084850","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"silicon isotopes; Ge/Si ratios; banded iron formation; Archaean; PongolaSupergroup","OtherDescriptors":null,"Notes":null,"AnaPub":2012,"MonPub":null,"DateUpdate":"2020-06-25","DateCreate":"2016-05-29","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000314079000012","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.epsl.2012.07.035"},"refs":null,"anarec":{"AnaID":257428,"PubliDate":2012,"Pagination":"109-118","XtraPublOfAnaID":null,"ISBN":null,"Volume":"355-356","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42615,"SerRR":"Earth and Planetary Science Letters. 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