Computer Science
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..86...69s&link_type=abstract
Earth and Planetary Science Letters, Volume 86, Issue 1, p. 69-76.
Computer Science
18
Scientific paper
Beryllium isotopes (10Be and 9Be) have been measured in suspended particles of < 1 mm size collected by mid-water sediment traps deployed in the eastern Pacific at MANOP sites H (6°32'N, 92°50'W, water depth 3600 m) and M (8°50'N, 104°00'W, 3100 m). For comparison, surface sediments from box cores taken from the two sites were also studied. The concentrations of 10Be and 9Be in sediment-trap particles are about an order of magnitude smaller than those in the bottom sediments which contain about 8 × 109 and 6 × 1016 atoms g-1 of 10Be and 9Be, respectively. The sediment trap samples collected from 50 m off the bottom showed significant (26-63%) contributions from resuspended bottom sediments. The 10Be/9Be ratio in trap samples varies from 3 to 20 × 10-8. The variation may partly result from varied proportion of authigenic/detrital material. The fluxes of both isotopes exhibit a very strong seasonality. The fluxes of 10Be into the traps at about 1500 m are estimated as 9 × 105 and 4 × 105 atoms cm-2 a-1 at sites H and M respectively. These values are to be compared with the fluxes into the sediments of 4-5 × 105 atoms cm-2 a-1 at both locations. Good correlations exist between 10Be, 9Be and 27Al indicating that the primary carrier phase(s) for the beryllium isotopes in the water column may be aluminosilicates.
Also at Tandem Accelerator Laboratory, McMaster University, Hamilton, Ont. L8S 4K1, Canada.
Ku Teh-Lung
Mahannah R.
Moore Willard S.
Sharma Pankaj
Southon John R.
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