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...
Paper Details
Title
Seawater Strontium Isotopic Variations from 2.5 Million Years Ago to the Present
Published Date
Jul 6, 1990
Journal
Volume
249
Issue
4964
Pages
51 - 55
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