Document Detail

Seawater strontium isotopic variations from 2.5 million years ago to the present.
MedLine Citation:
PMID:  17787626     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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.
R C Capo; D J Depaolo
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  249     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  1990 Jul 
Date Detail:
Created Date:  2010-06-08     Completed Date:  2010-07-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  51-5     Citation Subset:  -    
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