Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present

Details Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sci...249...51c&link_type=abstract

Science, Volume 249, Issue 4964, pp. 51-55

Physics

37

Scientific paper

Measurements of marine carbonate samples indicate that during the past 2.5 million years the 87Sr/86Sr ratio of seawater has increased by 14 x 10-5. The high average rate of increase of 87Sr/86Sr indicates that continental weathering rates were exceptionally high. Nonuniformity in the rate of increase suggests that weathering rates fluctuated by as much as ±30 percent of present-day values. Some of the observed shifts in weathering rates are contemporaneous with climatic changes inferred from records of oxygen isotopes and carbonate preservation in deep sea sediments.

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