Statistics – Applications
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..443b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 2, pp.443-452
Statistics
Applications
22
Scientific paper
Using sequential leaching experiments we have measured the fraction of the cosmogenic isotope 10 Be (half-life 1.5 My), and its stable isotope 9 Be, co-extracted with the following phases in marine sediments: exchangeable, calcium carbonate, Fe and Mn oxyhydroxides, organic, opal and detrital. The extraction of the authigenic phases typically release ~70% of the 10 Be but only ~40% of the 9 Be. In order to test its potential for dating marine sediments, we have measured the authigeniccally associated 10 Be/ 9 Be in 17 surface sediment samples from different ocean basins. The observed spatial variability, which appears to be influenced by proximity to continental input of 9 Be, precludes the general and precise applications of leached 10 Be/ 9 Be for dating. However, the relatively constant value observed in surface sediments over large areas of the Pacific, Indian and Southern Atlantic oceans shows considerable promise for approximate dating of open oceans sediments. In order to test temporal variability, a profile of the authigenically associated 10 Be/ 9 Be ratio has been measured in the independently dated Central Pacific core, RC12-65. The observed variation in 10 Be/ 9 Be over the past nine My is approximately twice that expected on the basis of 10 Be decay alone. Several possible explanations for such behavior and their potential consequences for the use of leached 10 Be/ 9 Be for dating are discussed.
Bourlès Didier
Raisbeck Grant M.
Yiou Françoise
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