Response of benthic foraminifera to organic carbon accumulation rates in the Okinawa trough

Wahyudi*, Masao Minagawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The last glacial maximum in an Okinawa Trough sediment core is marked by high accumulation rate of organic carbon derived from surface water productivity. This coincides with increasing individual numbers of two benthic foraminifera, infaunal species Uvigerina peregrina and epifaunal Cibicidoides wuellerstorfi, and great δ13C difference between both species. The increased abundances of U.peregrina and C. wuellerstorfi during the last glacial episode are interpreted as the result of a higher flux of organic matter (food) reaching the sediment surface as a consequence of increased surface water productivity. The good correlation between differences in δ13C values of U.peregrina and C. wuellerstorfi and the organic carbon accumulation rates suggests that the greater the flux of organic matter reaching the sea floor, the more 13C depleted CO2 was released by organic matter decomposing within the sediment. On the other hand, when the flux of organic matter decreased, the 13C depleted CO2 within the sediment also decreased. We suggest that this δ13C difference can be utilized as an indicator of organic matter flux changes. These findings provide new evidence for the paleoceanography of the Okinawa Trough in the East China Sea.

Original languageEnglish
Pages (from-to)411-420
Number of pages10
JournalJournal of Oceanography
Volume53
Issue number5
Publication statusPublished - Oct 1997

Keywords

  • Benthic-foraminifera
  • C
  • Cibicidoides wuellerstorfi
  • East-China-Sea
  • O
  • Okinawa-trough
  • Organic-carbon
  • Paleoproductivity
  • Sediment-core
  • Uvigerina peregrina

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