基于区域河湖地貌演化历史的大荔人化石层位年代分析

发布时间：2018-03-14 09:21

本文选题：大荔人　切入点：洛河　出处：《地理学报》2016年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:At present, the stratigraphic chronology of the fossils containing Dali people is still very controversial. The loess paleosol sequence dating method is widely used to investigate the evolution history of the river and lake environment in the northeast region of the Weihe basin and the upper and lower reaches of the Luohe River near the Dali fossil site. On this basis, combined with the geomorphological sedimentary body characteristics of the fossils produced in Dali, the authors analyzed the regional evolution stage in which the fossils were formed and the age of deposition of the fossilized deposits. The results show that, During the development or accumulation of S14, L9, L6, S2, L2, and L1SS, the ancient lake retreated or cut down several times, and the sediments containing the Dali fossils were deposited on the back of a lake in the late L6 region, and the Luohe was deposited on the bottom of an ancient lake exposed to air. The age of accumulation is about the same as that of S5 paleosol, with an average age of about 0.55 Ma BP.The results of this study suggest that the old age frame estimated by academic circles for Peking ape-man may be relatively young.
【作者单位】：上海师范大学旅游学院地理系;
【基金】：国家自然科学基金项目(41371021)~~
【分类号】：Q981

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