摘要
从大理洱海湖盆西部平原湖沼相地层的分布和相关的^(14)C年龄测定以及文物考古资料,阐述了晚更新世中期以来洱海的演变。研究表明,距今5万年以来洱海西部古湖岸线是从西向东迁移的。期间曾有过几次摆动。引起洱海古湖岸线变迁的主导因素是点苍山断块的间歇性抬升和洱海湖盆的下沉,地质历史时期的气候干湿演变也起了重要作用。
This paper deals with the evolution of the Erhai Lake that have occurred since middle of late Pleistocene on the basis of distribution of lacustrine facies sediments in the western plain of Erhar Lake basin. and with the radiocarbon age determination of relevant sediments and archaeological data.The research indicates that the ancient bank line of the western part of Erhar Lake shifted from west to east 50 thousands years B.P.. During this period if oscillated several times.The main factor causing the shift of the bank line are the intermittent uplift of the Canshan block and the intermittent subsidence of the Erhai Lake basin.The climat-tic change in geologic history has also played an important role.
出处
《地震地质》
EI
CSCD
北大核心
1991年第2期179-183,共5页
Seismology and Geology
关键词
地层
第四纪
^14C年龄
云南
Vunnan, Erhai Lake basin, Quarternry, Radiocadon age, Ancient bank line
