论文部分内容阅读
目前对含大荔人化石的地层年代认识仍存很大争议。采用黄土—古土壤序列定年法广泛调查渭河盆地东北部区域和大荔人化石点附近洛河上下游河段过去的河湖环境演变历史;在此基础上,结合产出大荔人化石的地貌沉积体特征,分析其形成时所处的区域演化阶段及其中含化石的沉积层位堆积年代。结果显示,区域曾在S14、L9、L6、S2、L2和L1SS发育或堆积时期发生过数次古湖湖退或河流下切;含大荔人化石的沉积层是在区域发生于L6晚期的一次湖退后,洛河于出露至气下的古湖湖底上堆积而成的,其堆积时代与S5古土壤发育时代相当,平均年龄约0.55 Ma BP。由该研究结果推论,学界对北京猿人年龄估计的老的年龄框架可能偏年轻。
At present, there are still many controversies about the formation age of fossils containing Dali people. Using Loess-Palaeogeography dating method, the evolution history of rivers and lakes in the upper and lower reaches of the Luo River near the northeastern Weihe River basin and Dali people’s fossil sites was extensively investigated. On the basis of this, Sedimentary characteristics of the depositional area are analyzed, and the evolutional stages of the area where the formation was located and the age of sedimentary layers containing fossils are analyzed. The results showed that there were several times during the development or accumulation of S14, L9, L6, S2, L2 and L1SS in the region where the ancient lakes retreated or the river was undercut. The sediments containing Dali people fossils occurred once in the late L6 in the area After the lake retreated, Luohe piled up on the bottom of the exposed ancient lake. The accumulation age was equivalent to that of the S5 paleosol development with an average age of about 0.55 Ma BP. According to the results of this study, the old age framework of the academia in estimating the age of the ape-man in Beijing may be young.