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

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