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柴达木盆地东北部3500年树轮定年年表的初步建立
  • 摘要

    利用柴达木盆地东北部山地上生长的活树,尚未倒伏的死树和山前洪积扇上古墓中保存的椁木、棺木和封土柏木,在树轮年代学交叉定年技术的支持下,建立了该区长达3500年的树轮定年年表.最长的活树样本可追溯到公元404年,古木样本覆盖的时段是公元前1580年~公元793年,而死树样本覆盖了公元130~1794年.3种样本在时间上具有很长的重叠时段,为建立长定年年表提供了可行.样本间能够很好地交叉定年.此外,古木和死树在重叠时段轮宽变化的相关系数是0.51,死树和活树的是0.41,并且古木和活树的是0.61.这种极显著的相关关系说明建立长定年年表是可能的.将程序COFECHA为每个活树样点保存的定年序列、古木的定年序列和死树的定年序列放在一起,再运行程序COFECHA,就建立了一个基于621棵树的样本量组成的总定年年表.该年表的取材完全独立于已发表的都兰年表,在时间上比都兰年表向前延伸了近1000年,使其能够达到商、周朝代.与调整后的都兰年表对比,发现两者在公元前328年~公元2000年之间完全能够交叉定年.文章所建的树轮定年年表是国内目前最长的连续年表,它可为我国西北干旱-半干旱区树轮长序列的定年提供标尺.

  • 作者

    邵雪梅  王树芝  徐岩  朱海峰  许新国  肖永民  Shao Xuemei  Wang Shuzhi  Xu Yan  Zhu Haifeng  Xu Xinguo  Xiao Yongmin 

  • 作者单位

    中国科学院地理科学与资源研究所,北京,100101/中国社会科学院考古研究所,北京,100710/青海省文物考古研究所,西宁,810007

  • 刊期

    2007年4期 ISTIC PKU

  • 关键词

    树木年轮  交叉定年  年表  祁连圆柏  柴达木盆地东北部 

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