2003
DOI: 10.2113/0520493
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The U-series Toolbox for Paleoceanography

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Cited by 238 publications
(240 citation statements)
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References 163 publications
(193 reference statements)
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“…Excess activities were calculated using a correction for the supported detrital portion of the total 230 Th and 231 Pa measured. The detrital fraction of 238 U was calculated assuming a detrital source for all 232 Th, and a detrital 238 U/ 232 Th activity ratio of 0.5±0.2, within error of the value (0.57-0.6 ± 0.2) estimated in previous studies of North Atlantic sediments 5,16,38 . Each sample was also corrected for radioactive decay of excess nuclides since the time of deposition.…”
Section: Discussionsupporting
confidence: 76%
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“…Excess activities were calculated using a correction for the supported detrital portion of the total 230 Th and 231 Pa measured. The detrital fraction of 238 U was calculated assuming a detrital source for all 232 Th, and a detrital 238 U/ 232 Th activity ratio of 0.5±0.2, within error of the value (0.57-0.6 ± 0.2) estimated in previous studies of North Atlantic sediments 5,16,38 . Each sample was also corrected for radioactive decay of excess nuclides since the time of deposition.…”
Section: Discussionsupporting
confidence: 76%
“…New evidence also suggests the possibility of enhanced 230 Th removal by nepheloid layers 6,7,42 , but this also appears to be an unlikely explanation for the observations of a B30% increase in 231 Pa/ 230 Th during HS1 from a mean LGM value that is similar to the modern. The best estimates are that B90% of the 230 Th currently produced in the North Atlantic is deposited within the basin 1,6 , with a B20-year residence time 2,5 . It is unlikely that nepheloid layers, or any other scavenging mechanism, could increase this removal by an additional 30% ARTICLE of the total for longer than a few decades, much less do so without any increase in the scavenging of 231 Pa.…”
Section: Discussionmentioning
confidence: 99%
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“…Thorium (Th) isotopes have been used commonly as radiotracers for studies of marine sediments including their sources, transport and sedimentation rates [1] [2][3] [4]. Th is among the most particlereactive elements and is thus rapidly removed from the water column, primarily by particle scavenging leading to low concentrations of Th in sea water and short residence times [5].…”
Section: Introductionmentioning
confidence: 99%
“…A= A 0 e -λ(t) (1) t=z/s (2) where A 0 and A are the activities of radionuclides at the surface and depth z, respectively, λ is the decay constant, s is the sedimentation rate (cm/year) and t is the age of sediment at depth z. . The result show high sediment accumulation rate with 4.67 cm/year was determined using the 228 Th model.…”
mentioning
confidence: 99%