{"refrec":{"BRefID":128313,"RR":"<b>Griffith, E.M.; Paytan, A.; Caldeira, K.; Bullen, T.D.; Thomas, E.</b> (2008). A dynamic marine calcium cycle during the past 28 million years. <i>Science (Wash.) 322(5908)</i>: 1671-1674","BEntID":122399,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Science (Wash.) 322(5908)</i>: 1671-1674","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Griffith, E.M.; Paytan, A.; Caldeira, K.; Bullen, T.D.; Thomas, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Griffith, E.M. <i>et al.</i>","Englishabstract":"Multiple lines of evidence have shown that the isotopic composition and concentration of calcium in seawater have changed over the past 28 million years. A high-resolution, continuous seawater calcium isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the seawater calcium isotopic ratio suggesting changes in seawater calcium concentrations. The most pronounced increase in the d<sup>44/40</sup>Ca value of seawater (of 0.3 per mil) occurred over roughly 4 million years following a period of low values around 13 million years ago. 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