周口店北京猿人洞骨化石铀系年龄数据——混合模式

人类学学报 ›› 1982, Vol. 1 ›› Issue (02): 191-196.

周口店北京猿人洞骨化石铀系年龄数据——混合模式

夏明

出版日期:1982-06-15 发布日期:1982-06-15

Uranium-series dating of fossil bones from Peking man cave——mixing model

Xia Ming

Online:1982-06-15 Published:1982-06-15

摘要/Abstract

摘要： 铀系混合模式得出北京猿人在第一地点生活的年代是距今50万年到23万年。通过周口店猿人洞堆积物骨化石中 Th~(230)/U~(234)和 U~(234)/U~(232)的测定,建立铀系混合模式,给出下列年龄值:第1—3层距今23万年,6—7层距今35万年,8—9层大于40万年,12层距今50万年前或更早。一些中间层位的Th~(230)/U~(234)比值测定年龄偏低,可能是近20万年以来铀发生迁移造成的。

关键词: 铀系方法定年;混合模式;骨化石;北京猿人

Abstract: A mixing model of uranium-series method based on Th230/U234 and U234/U238 ratios for the sediment of Peking Man eave is discussed here. The resulting ages of fossil bones collected at the Loe. 1 are determined as follows: about 230 X 108 yr B.P. for the lst-3rd layers, 350 X 103 yr B.P, for the 6th-7th, over 400 X 103 yr B.P. for the 8th-9th, and more than 500 X 103 yr B.P. for the 12th.
In an attempt to explain the discordant isotopic ratios of a suite of bone samples from Peking Man eave, the author is of the opinion that the paleohydrological condi_x001F_tions in the environment changed during the last 200 X 103 yr, so did the migration processes of uranium concentrations. Hence fossil bones for uranium-series method have indeed commanded much attention.

Key words: Uranium-series dating; Mixing model; Fossil bone; Peking Man

夏明. 周口店北京猿人洞骨化石铀系年龄数据——混合模式[J]. 人类学学报, 1982, 1(02): 191-196.

Xia Ming. Uranium-series dating of fossil bones from Peking man cave——mixing model[J]. Acta Anthropologica Sinica, 1982, 1(02): 191-196.