摘要
本文报道了取于北京猿人遗址第1—2层的二个钙板样的铀系年龄。下列实验证据支持数据的可信度:二个样品的定年结果在误差范围内一致且^(230)Th/^(234)U值均接近平衡;BZC-3样三次^(230)Th/^(234)U年龄测定获一致结果;^(230)Th/^(234)U和^(227)Th/^(230)Th二法对照的结果表明BZC-3样构成封闭体系。基于BZC-3样三次平行分析所得同位素比值的加权平均值,提出北京猿人遗址的上限年龄应为42±_5^(11)万年。
This paper presents the U-series dating of two calcite samples taken from a tra-avertin layer interstratified in 1-2 layer at Locality 1 of Beijing Man Site. The reliability of the obtained results is supported by following evidences: The results of two samples are consistent within the statistical error of±1σ and their 230Th/234U ratios all near to equilibrium; Three parallel 230Th/234U age determinations of BZC-3 give consistent results; Concordance between 230Th/234U and 227Th/230 Th ages indicates a closed system of BZC-3. Based on the weighted mean of isotopic ratios of three 230Th/234U analyses of BZC-3, the upper age limit of Beijing Man Site should be(42±5 11)×104 years.
出处
《人类学学报》
CSCD
北大核心
1991年第4期273-277,共5页
Acta Anthropologica Sinica
关键词
北京猿人
遗址
铀系年代
Beijing Man Site
Travertin layer
U-series age
