Authigenic uranium in marine sediments of the Benguela current upwelling region during the last glacial period

Ein-Fen Yu, Chih Hung Liang, Min Te Chen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Anomalously high uranium contents and 238U/232Th activity ratios deposited during the oxygen isotope stages 2 to 4 are observed in the MD962085 core from the Benguela Current upwelling area. In conjunction with the activity ratio of 234U/238U, the high uranium contents found in this core cannot be considered as detrital; instead, they must be of authigenic origin. The high biological productivity in the overlying seawater may have induced a high flux of organic matter resulting, directly or indirectly, in a reducing environment, and may have led to the addition of authigenic uranium to the sediments during the last glacial period. The correspondence between the variations in authigenic U content, %TOC, and 230Thex-normalized TOC flux supports this suggestion. The observed high paleoproductivity during the last glacial period of the core may be due to the greater intensity of upwelling in the Benguela Current upwelling system.

Original languageEnglish
Pages (from-to)201-214
Number of pages14
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume10
Issue number1
DOIs
Publication statusPublished - 1999 Jan 1

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Last Glacial
marine sediment
uranium
upwelling
paleoproductivity
oxygen isotope
seawater
organic matter
productivity
sediment

Keywords

  • Authigenic uranium
  • Benguela current upwelling
  • Last glacial stage

ASJC Scopus subject areas

  • Oceanography
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Authigenic uranium in marine sediments of the Benguela current upwelling region during the last glacial period. / Yu, Ein-Fen; Liang, Chih Hung; Chen, Min Te.

In: Terrestrial, Atmospheric and Oceanic Sciences, Vol. 10, No. 1, 01.01.1999, p. 201-214.

Research output: Contribution to journalArticle

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N2 - Anomalously high uranium contents and 238U/232Th activity ratios deposited during the oxygen isotope stages 2 to 4 are observed in the MD962085 core from the Benguela Current upwelling area. In conjunction with the activity ratio of 234U/238U, the high uranium contents found in this core cannot be considered as detrital; instead, they must be of authigenic origin. The high biological productivity in the overlying seawater may have induced a high flux of organic matter resulting, directly or indirectly, in a reducing environment, and may have led to the addition of authigenic uranium to the sediments during the last glacial period. The correspondence between the variations in authigenic U content, %TOC, and 230Thex-normalized TOC flux supports this suggestion. The observed high paleoproductivity during the last glacial period of the core may be due to the greater intensity of upwelling in the Benguela Current upwelling system.

AB - Anomalously high uranium contents and 238U/232Th activity ratios deposited during the oxygen isotope stages 2 to 4 are observed in the MD962085 core from the Benguela Current upwelling area. In conjunction with the activity ratio of 234U/238U, the high uranium contents found in this core cannot be considered as detrital; instead, they must be of authigenic origin. The high biological productivity in the overlying seawater may have induced a high flux of organic matter resulting, directly or indirectly, in a reducing environment, and may have led to the addition of authigenic uranium to the sediments during the last glacial period. The correspondence between the variations in authigenic U content, %TOC, and 230Thex-normalized TOC flux supports this suggestion. The observed high paleoproductivity during the last glacial period of the core may be due to the greater intensity of upwelling in the Benguela Current upwelling system.

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