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.
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 language | English |
|---|---|
| Pages (from-to) | 893-899 |
| Number of pages | 7 |
| Journal | Holocene |
| Volume | 16 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 16 Feb 2006 |
Keywords
- Chinese loess
- Pleistocene/Holocene boundary
- sedimentation rate
- luminescence chronology
- quartz OSL
- optically stimulated luminescence
- magnetic susceptibility