AMS RADIOCARBON DATING PROBLEMS BETWEEN 10 AND 8 KA BP IN LACUSTRINE DEPOSITS FROM LAKE GUN NUR, NORTHERN MONGOLIA

作者：Chang F Q; Zhang H C^*; Ming Q Z; Chen G J; Zhang W X; Shi Z T; Feng Z D

来源：Radiocarbon, 2011, 53(3): 501-509.

Accelerator mass spectrometry (AMS) radiocarbon dating a continuous core from Lake Gun Nur, northern Mongolia, shows a period between 10 and 8 ka BP that could not be dated accurately. Further dating on alkali-insoluble residue and humic acid from the same samples in the Gun Nur core suggest that this AMS (14)C date anomaly is neither analytical nor material related. We hypothesize that the (14)C anomaly may be derived from increasing production rates of (14)C caused by diminished solar activity, a low (14)CO(2)/(14)CO ratio in the atmosphere, or an unstable (14)C flux in the lower atmosphere caused by changing geomagnetic field strength. Our results imply that the (14)C data used for (14)C age calibration cannot correct the age-depth regression between 8 and 10 ka BP to fit the age-depth model along with other time intervals.

• 出版日期2011
• 单位云南师范大学