科研之友
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摘要
Four fen peat sequences in northern Finland were dated by the accelerator mass spectrometry (AMS) radiocarbon method in order to study past peatland dynamics and carbon accumulation patterns. Initially plant macrofossils were used for dating. However the dates were severely disordered with marked inversions in all sequences. In one 140-cm peat core for example all ages fell within a similar to 1000-yr time Following these unreliable results a few bulk peat samples were dated to help assess if any of the plant macrofossil-derived dates were reliable. Bulk dates did not help to solve the problem. This study evaluates the possible sources of error but is unable to single out one clear cause. It is probable that many factors related to the fen environment such as flooding and root intrusion may have contributed to the errors. Peat plant macrofossils and bulk peat samples are considered to be reliable dating materials but the examples given herein highlight the difficulties that can be associated with AMS dating of peat samples.
- 出版日期2014
