安徽省霍邱县堰台遗址演化过程的沉积环境分析

An Analytical Research on Sedimentary Environment in the Evolutionary Process of the Archaeological Site of Yantai in Huoqiu,Anhui Province

根据野外研究和室内分析,堰台遗址外围剖面地层的沉积类型属于湖沼相的静水沉积。粒度分析表明堰台遗址外围剖面地层中的沉积物几乎全部由粒径大于4Ф的悬移物质组成,其分选系数一般都大于2,偏度在0～0.1之间,尖度在0.90～1.11之间。堰台遗址在其演化过程中与周围的湖沼有着密切的联系,湖沼的演化在不同程度上促进或者阻碍了堰台遗址的发展。当湖沼水位上升时,堰台遗址则向后退缩;当湖沼水位下降时,堰台遗址则向湖沼方向扩展。

<Abstrcat>Based on field research and laboratory analysis,a conclusion was reached that sedimentary faces of external strata at Yantai archeological site are hydrostatic and limnetic.The grain size analysis reveals that the sediments of external strata at Yantai archeological site are almost composed of suspended loads whose particle diameter is above 4Ф.The sorting coefficient is generally above 2,the coefficient of skewness varies from 0 to 0.1 and the coefficient of kurtosis lies in a range of 0.90~1.11.There had been a close relationship between Yantai archeological site and the lake marsh beside,and the changes of the lake marsh may have facilitated or blocked to some extent the evolution of Yantai archaeological site.When the water level of the lake marsh raised Yantai archaeological site would hold back;it would expand to some extent as the water level of the lake marsh fell down due to some natural factors.