A dynamic marine calcium cycle during the past 28 million years

Elizabeth M. Griffith, Adina Paytan, Ken Caldeira, Thomas D. Bullen, Ellen Thomas

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

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 δ44/40Ca 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.

Original languageEnglish
Pages (from-to)1671-1674
Number of pages4
JournalScience
Volume322
Issue number5908
DOIs
StatePublished - 12 Dec 2008
Externally publishedYes

ASJC Scopus subject areas

  • General

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