云南高原典型湖泊演化及环境变化初步考察

INVESTIGATION OF THE EVOLUTION AND ENVIRONMENT CHANGE OF TYPICAL LAKES IN YUNNAN

本文对云南省境内7个典型湖泊系统和湖区地貌的科考,湖芯取样140米,同时对部分湖泊采集了底泥样品。对湖区湖岸阶地、层状地貌和相关地层考察研究表明,存在着2～3次明显的高湖岸;湖泊中分布着多层高于落水洞的形成于更新世晚期的螺壳层;蛇山顶部开挖的剖面沉积特征及前人的测年资料表明,蛇山组沉积结束于末次冰期晚期。

This paper introduces the primary results of investigations of seven lake systems and geomorphology of the lake areas in Yunnan.A total of 140 m of drilling cores were recovered from the wells in the seven lakes and bed mud samples were taken from some of the lakes.Investigation and study of the lake terraces,layered geomorphology and related strata indicate that there exist two to three distinct highstand banks and that many conch layers are distributed in the lakes,which are higher than dolinen and formed during the later Pleistocene.The sedimentary characteristics of the section at the top of Snake Mountain and previous dating data suggest that the deposition of the Sheshan Formation ended in the late part of the last glacial epoch.