{"refrec":{"BRefID":287053,"RR":"<b>Wit, J.C.; de Nooijer, L.J.; Haig, J.; Jorissen, F.J.; Thomas, E.; Reichart, G.-J.</b> (2017). Towards reconstructing ancient seawater Mg/Ca by combining porcelaneous and hyaline foraminiferal Mg/Ca-temperature calibrations. <i>Geochim. Cosmochim. Acta 211</i>: 341-354. <a href=\"https://dx.doi.org/10.1016/j.gca.2017.05.036\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2017.05.036</a>","BEntID":279077,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 211</i>: 341-354. <a href=\"https://dx.doi.org/10.1016/j.gca.2017.05.036\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2017.05.036</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Wit, J.C.; de Nooijer, L.J.; Haig, J.; Jorissen, F.J.; Thomas, E.; Reichart, G.-J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Wit, J.C. <i>et al.</i>","Englishabstract":"The temperature of the deep ocean plays a vital role in the Earth’s climate system. Paleo-reconstructions of deep-sea temperatures have traditionally been based on the oxygen isotope composition of deep-sea benthic foraminiferal calcite shells, although this parameter depends upon polar ice volume as well as temperature. More recent reconstructions use Mg/Ca in these shells, with temperature calibrations based on empirical relationships observed in present-day oceans. Incorporation of Mg (DMg) into foraminiferal calcite is, however, not solely dependent on temperature, but also on seawater Mg/Ca. Due to its long oceanic residence time, Mg concentrations remained relatively constant over time scales of a few hundred thousand years, but varied significantly over longer geological time scales. Accurate reconstruction of past temperatures using foraminiferal Mg/Ca, therefore, hinges on our understanding of Mg/Ca seawater changes on geological timescales. We explore a novel, independent approach to reconstructing past seawater Mg/Ca using the temperature-dependent offset in DMg between porcelaneous (secreting intermediate- or high-Mg calcite, abbreviated as IMC or HMC, respectively) and hyaline (producing low-Mg calcite, abbreviated as LMC) benthic foraminifera. We calibrated the Mg/Ca-temperature dependence for Pyrgo spp. (one of the few common, large-sized porcelaneous taxa present in the deep-sea since the middle Miocene), and combined this with an existing calibration of hyaline Cibicidoides spp. to mathematically solve for changes in Mg/Ca seawater through time. We show that changes in Mg/Ca seawater can be reconstructed using the offset between porcelaneous and hyaline foraminifera, but absolute values are highly dependent on the species-specific offset between Mg/Ca seawater and Mg-partition coefficients.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Towards reconstructing ancient seawater Mg/Ca by combining porcelaneous and hyaline foraminiferal Mg/Ca-temperature calibrations","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":"Mg/Ca seawater; Benthic foraminifera; Temperature reconstructions; Proxy calibration","OtherDescriptors":null,"Notes":null,"AnaPub":2017,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2017-07-24","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000405786800019","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.gca.2017.05.036"},"refs":null,"anarec":{"AnaID":287053,"PubliDate":2017,"Pagination":"341-354","XtraPublOfAnaID":null,"ISBN":null,"Volume":"211","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. Elsevier: Oxford,New York etc..  ISSN 0016-7037; e-ISSN 1872-9533","StandardTitleSer":"Geochimica et Cosmochimica Acta","ISSN":"0016-7037","AbbrevSer":"Geochim. Cosmochim. 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