“寒亭组”是山东唐宋时期两期洪水的产物——基于沭河沙带调查及光释光测年研究

Hanting Formation is the Product of Two periods of Flood in Tang and Song Dynasties in Shandong Province—Based on Investigation and Optical Luminescence Dating of Shuhe Sand Belt

摘要:

对分布于临沂一带沂河与沭河沿岸沙带的展布形态与沉积层理进行研究，认为该沙带属于古洪水期滞留沉积物（SWD），并非以往认为的风沙成因（寒亭组）。为了获取滞留沉积物的形成年龄，采用光释光测年（OSL）方法，首次获得对应沉积物年龄为0.8ka，1.2ka，结合相关历史时段的洪水记录，综合分析后，认为该滞留沉积物记录了发生在唐宋时期的两次历史洪水。

Abstract:

The distribution pattern and sedimentary bedding of the sand belts along Yihe river and Shuhe river in Linyi city have been studied. It is considered that the sand belts belong to the sediments retained during the paleoflood period (SWD), not the former aeolian sand (Hanting formation). In order to obtain the formation age of the retained sediments, by using Optical Luminescence Dating (OSL) method, the corresponding sediment ages have been gained as 0.8ka and 1.2ka firstly. Based on the flood records of relevant historical periods and comprehensive analysis, it is considered that the retained sediments recorded two historical floods in Tang and Song Dynasties.