A dynamic marine calcium cycle during the past 28 million years.

@article{Griffith2008ADM,
  title={A dynamic marine calcium cycle during the past 28 million years.},
  author={Elizabeth M. Griffith and Adina Paytan and Ken Caldeira and Thomas D. Bullen and Ellen Thomas},
  journal={Science},
  year={2008},
  volume={322 5908},
  pages={
          1671-4
        }
}
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 delta44/40Ca value of seawater (of 0.3 per mil) occurred over roughly 4… CONTINUE READING

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