云南中甸纳帕海湖泊记录指示的57ka环境演化  

LACUSTRINE RECORDS OF ENVIRONMENTAL CHANGES DURING THE LAST 57 ka IN THE NAPAHAI LAKE,NORTHWESTERN YUNNAN,CHINA

作　　者：殷勇[1] 方念乔[2] 盛静芬[1] 胡超涌[2] 聂浩刚[2] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,南京210093 [2]中国地质大学,北京100083

出　　处：《海洋地质与第四纪地质》2002年第4期99-105,共7页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金资助项目(49672135);国家重大基础研究项目(G1998040800)

摘　　要：根据沉积环境、总有机碳、氢指数、有机碳同位素、磁化率和粒度等替代性指标以及和陆地、深海气候记录的对比,重建了纳帕海57kaBP以来的湖面变化和主要气候演化阶段。57～32kaBP主要为低湖面和频繁的湖面波动,与气候的暖偏干/凉偏湿交替有关。32～15kaBP湖面大幅度上升,出现相对高湖面,气温下降,有效湿度增加。全新世湖盆的萎缩与持续的暖偏干气候有关。这种冷湿-暖干气候与滇西北特殊的地形地貌造成大气环流的独特性有关。Situated in the hinterland of the Hengdan Mountains, NW Yunnan, the Napahai Lake is a kettlelike basin in calcareous terrain. Its lake levels have a great difference between lowstanding and highstanding according to modern geomorphological settings. This mechanism and the results from the total organic carbon, hydrogen index, organic carbon isotope, magnetic susceptibility and granulometric analysis allowed us to reconstruct the environmental history recorded in the radiocarbondated sediment column. The results show the high lake level environment lasted from ca. 32 kaBP to 15 kaBP. Before its rising at ca. 32 kaBP, the lake level fluctuated between lowstanding and intermediatestanding, resulting in facies changes between swampy lake and shallow lake. After a large declining of lake level took place at 15 kaBP, the Napahai Lake began to shrink and a swampy lake dominated the basin, although there was a minor rising of lake level before it transitted to modern environment. The fluctuation of lake level is controlled by the climate changes. It seems that the lowstanding lake level coincides with a warmdry climate and highstanding lake level with a coolwet climate, which might be attributed to the special geomorphology that results in special atmospheric circulation.

关 键 词：云南 湖泊记录 湖面波动 环境-气候变化 中甸纳帕海 沉积环境 

分 类 号：P512.2[天文地球—地质学] P532