Locating the boundary between the Pleistocene and the Holocene in Chinese loess using luminescence

Zhong-Ping Lai, Ann G. Wintle

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Abstract

A detailed chronology has been obtained for a loess section at Yuanbao, situated at the northwestern edge of the Chinese Loess Plateau. The ages were obtained by the measurement of the optically stimulated luminescence (OSL) from coarse-silt-sized quartz grains. These ages showed that deposition at this site was continuous from 17 ka to the present, but that there was a decrease in the
sedimentation rate from 0.60 to 0.10 m/ka at 13.489/1.15 ka, and this is proposed as the location of the Pleistocene/Holocene (P/H) boundary. A change in OSL sensitivity occurs at this depth. The depth and sharpness of this boundary is compared with the change obtained in low-field magnetic susceptibility (MS)
measurements on 65 samples from the section. The MS changes gradually over 1.9 m and thus does not provide an easily discernible boundary. The new OSL-based sedimentation rates are used to calculate the mass accumulation rates for the Holocene and the end of the Pleistocene.
Original languageEnglish
Pages (from-to)893-899
Number of pages7
JournalHolocene
Volume16
Issue number6
DOIs
Publication statusPublished - 16 Feb 2006

Keywords

  • Chinese loess
  • Pleistocene/Holocene boundary
  • sedimentation rate
  • luminescence chronology
  • quartz OSL
  • optically stimulated luminescence
  • magnetic susceptibility

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