Title: Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present
Abstract: Measurements of marine carbonate samples indicate that during the past 2.5 million years the (87)Sr/(86)Sr ratio of seawater has increased by 14 x 10(-5). The high average rate of increase of (87)Sr/(86)Sr 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.
Publication Year: 1990
Publication Date: 1990-07-06
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 167
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