摘要
通过分析近30000年以来地球磁场强度和大气中^(14)C 含量变化,讨论了^(14)C年龄偏离实际值的原因,提出以地球磁场强度随时间的变化率校正^(14)C 年龄T_c 偏离实际年龄T_t 的公式,即T_t=T_c-b(T_c-T_(?)|_(F(1))ΔF/ΔT。用这一公式校正了^(14)C 测年技术给出的新仙女木事件发生的时限,并获得了与树轮年龄和U-Th 年龄一致的结果。本文还对12000年以来地球磁场强度变化与气候变迁的相关性做了探讨。
Based on the variations of the earth's magnetic field intensity and ^(14)C concen-tration in the atmosphere since 30000aB.P.,the possibility of the ^(14)C data deviationfrom true ages is explored in the paper.A formula,T_t=T_c-b(T_c-T_(?)|(?))△F/△Tis proposed,which could be used to the calibrate the ^(14)C timescale using the differ-entiation of the earth's magnetic field intensity with time.According to the formulathe Younger Dryas boundaries determined by ^(14)C dating are calibrated,and the cor-rected ^(14)C age is in good agreement with that determined by U-Th dating and den-drochronological estimates.The correlativity between the earth's magnetic fieldintensity variation and climatic changes since 12000 a B.P.is also addressed in thispaper.
出处
《第四纪研究》
CAS
CSCD
1991年第2期123-129,共7页
Quaternary Sciences
基金
博士后基金
