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A Dynamic Marine Calcium Cycle During the Past 28 Million Years

Dates

Year
2008

Citation

Griffith, Elizabeth M, Paytan, Adina, Caldeira, Ken, Bullen, Thomas D, and Thomas, Ellen, 2008, A Dynamic Marine Calcium Cycle During the Past 28 Million Years: Science, v. 322, iss. 5908, p. 1671-1674.

Summary

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.

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  • USGS National Research Program

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Added to ScienceBase on Thu Apr 18 09:20:35 MDT 2013 by processing file <b>Geochemical Reactions Between Water and Mineral Substrates.xml</b> in item <a href="https://www.sciencebase.gov/catalog/item/51118c8ae4b0361176563a13">https://www.sciencebase.gov/catalog/item/51118c8ae4b0361176563a13</a>

Additional Information

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Type Scheme Key
DOI http://sciencebase.gov/vocab/identifierScheme 10.1126/science.1163614

Citation Extension

citationTypeJournal Article
journalScience
parts
typePages
value1671-1674
typeVolume
value322
typeIssue
value5908

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