On the importance of opal, carbonate, and lithogenic clays in scavenging and fractionating 230Th, 231Pa and 10Be in the ocean

Shangde Luo, Teh Lung Ku

研究成果: Article同行評審

58 引文 斯高帕斯(Scopus)

摘要

The influence of particle composition on the scavenging of 230Th,231Pa, and 10Be in the ocean is critically re-examined based on the particle-solution distribution coefficient (Kd) data reported by Chase et al. [Earth Planet. Sci. Lett. 204 (2002) 215-229]. Our re-examination shows that the Kds for these radionuclides are strongly influenced by the amount of lithogenic material (lithogenics) in particulates as reported previously by us, and that a strong correlation between the lithogenic and carbonate contents in open-ocean particulates results in an apparent, non-linear correlation between %CaCO3 and Kd for each of the three radionuclides. Using a three-end-member model, we estimate that the respective Kds (g/g) of 230Th, 231Pa, and 10Be in the open ocean are: 2.3 × 108, 1.2 × 107, and 3.8 × 106 for lithogenics; 1.0 × 106, 1.0 × 105, and 3.0 × 104 for carbonate; and 2.5 × 105, 1.2 × 106, and 7.5 × 105 for opal, suggesting that lithogenics have a much stronger affinity for any of the three nuclides than does carbonate or opal. Lithogenics and carbonate preferentially scavenge 230Th over 231Pa and 10Be, whereas opal slightly favors 231Pa and 10Be over 230Th. Relative to lithogenics, carbonate plays a very limited role in fractionating 230Th, 231Pa, and 10Be due to its orders-of-magnitude smaller Kd values for the three nuclides. Our results indicate that fractionations between Pa and Th and between Be and Th through particle scavenging are mainly determined by the opal-to-lithogenic ratio in particulates, rather than the opal-to-carbonate ratio suggested by Chase et al.

原文English
頁(從 - 到)201-211
頁數11
期刊Earth and Planetary Science Letters
220
發行號1-2
DOIs
出版狀態Published - 2004 三月 30

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球化學與岩石學
  • 地球與行星科學(雜項)
  • 空間與行星科學

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