AMS measurements of 10Be and 14C in loess profile at Donglingshan, Beijing

A loess profile in Donglingshan site (40°02′N, 115°27′E) near Beijing was chosen to study the loess formation process and paleo-climate variation. Thirty eight samples were collected and analyzed for 14C, 10Be as well as MS, TOC and δ13C. Based on 14C measurements, we established a time scale for this loess profile during Holocene. The averaged 10Be deposition flux was found to be 4.87 × 106 atoms/cm2 year. This is similar to the flux of 4.2 × 106 atoms/cm2 year estimated for Chinese Loess Plateau in central China. High 10Be concentrations of 3.85–5.66 × 108 atoms/g for the samples in layer 23–39 cm from 2965 to 528 years BP suggest a warm and humid weather during this period. MS values have similar variation with 10Be and reflect the similar paleo-climate information. TOC and δ13C suggest that the vegetation around Donlingshan area was C3 type plants during entire Holocene.