金沙江河谷-水系发育的年代学框架分析与探讨

The Analysis and Discussions on the Chronological Frame of Jinshajiang River Valley-drainage

通过对近年来金沙江云南段考察研究获得的地貌、湖盆和环境效应记录的总结和梳理,并结合前人研究成果,建立了金沙江河谷-水系形成演化的年代框架,认为金沙江河谷-水系的演化历史可以分为3个阶段,即上新世-早更新世初的孕育阶段、早更新世末-中更新世的发展阶段和晚更新世的定型阶段。现代金沙江河谷-水系的地貌格局以及干热河谷的景观雏形都形成于早更新世末。

On the basis of our new geomorphologic, lacustrine and environmental feedback records and a reassess-ment of published date, the chronological framework of the evolution of Jinsha River valley drainage is reconstruc- ted. We suggest that the history of the Jinsha River valley drainage formation can be divided into 3 stages, namely embryonic stage （from the Pliocene to Early Pleistocene）, initial development stage （ from the end of Early Pleisto- cene to Middle Pleistocene） and shaping stage （ later Pleistocene）, and also propose the landforms pattern of Jinsha River including Dry-hot Valley should appear around the end of Early Pleistocene.