根据临汾盆地的演化过程分析“丁村组”的年代

自1954年发现“丁村人”化石至今,“丁村组”的年代长期存在很大争论。通过对S₅以来临汾盆地地貌沉积演化过程的研究,揭示出“丁村组”的堆积是在S₁早期的一次区域构造抬升引起盆地湖退后才开始发生的,时间距今大约13万年。结合上覆“丁村组”的黄土古土壤分析,发现其堆积结束于距今约5.2万年。“丁村组”的堆积与气下S₁古土壤的发育和L₁黄土下半段的堆积几乎是同期的,其形成时代横跨了中、晚更新世。

Analysis on the age of Dingcun Formation according to the evolution history of Linfen Basin

Since the discovery of fossils of Dingcun Culture in 1954, many scholars have been studying the age of Dingcun Formation in different ways. But there is still no certain answer to it by now. Some researchers think it was formed in the late of middle-Pleistocene, and the others think it was in the early of late-Pleistocene. Their researches normally focused on the changes of the fossils of Mammal in Dingcun Formation and determined its age according to these changes. Because some animals had lived for a long time during middle-late Pleistocene, this made it difficult to do so. As a terrace of Fenhe River, the deposition of Dingcun Formation was strongly controlled by the development of Linfen Basin during middle-late Pleistocene. By studying the landforms in Linfen Basin, we find: 1) there occurred an extensive withdrawal of lake resulting from a regionally structural uplift; while S 1 began to develop; 2) when L 1SS began to develop, the strong down dissection of Fenhe River led to the formation of the terrace(T3). The existence of an erosion surface in Dingcun section and the characteristics of Dingcun Formation indicated that there was a remarkable increase in hydrodynamics when Dingcun Formation began to accumulate. Taking all the above-discussed into account, we draw the following conclusions: 1)Dingcun Formation began to accumulate about 0.13MaBP when S 1 began to form, while a structural uplift took place there. 2)The deposition of Dingcun Formation ended about 52kaBP. The wet and warm climate then caused a strong down dissection and the end of the deposition of Dingcun Formation when L 1SS began to develop. 3)The accumulation of Dingcun Formation was in correspondence with the formation of S 1 and the lower part of L 1 in time.