Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..205l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 1, pp.205-217
Other
17
Scientific paper
Measurements of 230 Th, 231 Pa, and 10 Be in sediment trap samples and Holocene sediments collected along a transect in the northeastern Pacific indicate that the removal of these nuclides from the ocean is greatly influenced by boundary scavenging. More than 35% of the 230 Th, at least 70% of the 231 Pa, and as much as 85% of the 10 Be fluxes collected by sediment traps at a nearshore site (located ~120 km off shore) are supplied by lateral transport of the dissolved nuclides from the open ocean. These findings are consistent with the hypothesis that boundary scavenging is proportional to the oceanic residence times of the nuclides (10-40 y for 230 Th, ~ 100 y for 231 Pa, and ~ 1000 y for 10 Be). Results of this study indicate that particle flux is a principal factor influencing scavenging of 230 Th, 231 Pa, and 10 Be from the water column. The marine geochemistry of 10 Be in ocean-margins is fundamentally different from that in the open ocean. Scavenging of 10 Be occurs throughout the water column at the margin area in this study, in contrast to the pattern of 10 Be being removed only in the surface waters and then remineralized at depth in the open ocean. Aluminosilicate may be a major phase removing 10 Be from the water column in the open ocean but not at ocean-margins. Nuclide accumulation rates in the underlying Holocene sediments are all higher than the corresponding fluxes collected by sediment traps. Several possibilities that could account for this observation include: downslope sediment transport; deployment of the traps during a period when the particle flux was not representative of long-term average conditions; and scavenging of the nuclides from near bottom waters. The high accumulation rate of authigenic Mn in some Holocene sediments, which can be attributed to redox cycling of Mn, may have caused near bottom scavenging of 230 Th and 231 Pa as well as certain other trace elements (such as Ba, Cu, and Zn).
Anderson Robert F.
Broecker Wallace S.
Hofmann Hansjakob J.
Lao Yong
Wolfli Willy
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