Abstract: Based on the research on the applicability of TL dating and reliability of data for underwater sediments, the systematical sampling and synthetic dating with different methods have been made on the lower terraces along several major rivers in the east and west of Yunnan Province.The deposited ages of sediments and the formation times of the geomorphic surfaces of these lower terraces heve been obtained along these rivers.The sediments on the first terraces for I-grade tributaries deposited in 4500～11000a B.P. and their terrace surfaces formed during 4500～5000a B.P. The second is in 9000～22000a B.P. and their terrace surfaces formed during 9000～10000a B.P. The sediments on the first terraces of major rivers deposited in 9000～17000a B.P.and the terrace surfaces formed during 9000～10000a B.P. The second is in 15000～45000a B.P. and the terrrace surfaces formed in 15000a B.P. At the same time, the cause of formation of the lower terrace surfaces is studied for this area according to the analyses of ancient climate and environment during the sediment deposition.

Key words: Thermoluminescent dating, East and west of Yunnan Province, Deposit ages of terraces, Times of geomorphic surface of terrace

摘要： 在流水沉积物热释光测年适用性和测年数据可靠性研究的基础上,对滇东、滇西地区几条主要河流的低阶地进行了系统采样和多方法的综合测年,获得了该区主要河流低阶地沉积物的堆积年代及其阶地面的形成时代,该区I级支流T₁阶地堆积于4500～11000a B.P.,其阶地地貌面形成于4500～5000a B.P.;T₂阶地堆积于9000～22000a B.P.,该级地貌面形成于9000～10000a B.P.;主流T₁阶地的堆积年龄为9000～17000a B.P.,阶地面形成于9000～10000a B.P.;T₂阶地的沉积年龄为15000～45000a B.P.,阶地地貌面形成于15000a B.P.左右。同时,通过阶地堆积时期古气候、古环境的分析,探讨了该区低阶地地貌面的成因。

关键词: 热释光测年, 滇东、滇西地区, 阶地堆积年龄, 阶地地貌面时代