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A dynamic marine calcium cycle during the past 28 million years
Griffith, E.M.; Paytan, A.; Caldeira, K.; Bullen, T.D.; Thomas, E. (2008). A dynamic marine calcium cycle during the past 28 million years. Science (Wash.) 322(5908): 1671-1674
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
Peer reviewed article  

Available in Authors 

    Biogeochemical cycle; Calcium carbonates; Calcium isotopes; Chemical pollution; Isotopes; Seawater; Marine

Authors  Top 
  • Griffith, E.M.
  • Paytan, A.
  • Caldeira, K.
  • Bullen, T.D.
  • Thomas, E.

    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 d44/40Ca 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. The major change in marine calcium corresponds to a climatic transition and global change in the carbon cycle and suggests a reorganization of the global biogeochemical system.

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