近22ka以来吉兰泰盐湖的环境变化及成盐过程  

Environment Evolution and Salt Forming Process of Jilantai Salt Lake since 22ka BP

作　　者：庞西磊[1] 胡东生[1,2] 

机构地区：[1]湖南师范大学资源与环境科学学院,湖南长沙410081 [2]西北大学大陆动力学国家重点实验室,陕西西安710069

出　　处：《中国沙漠》2009年第2期193-199,共7页Journal of Desert Research

基　　金：湖南省重点学科建设项目(DL2007001)资助

摘　　要：根据研究区及毗邻地区第四纪地层沉积特征资料,运用层序地层学的基本方法,对吉兰泰盐湖22 ka BP以来的环境变化和成盐过程进行初步分析。同时,将其划分为6个阶段：冷干期（22.0～14.0 ka BP）,淡水湖演化阶段;冷湿期（14.0～10.0 ka BP）,仙女木期气候颤动期,湖水开始咸水化;暖湿期（10.0～7.0 ka BP）,咸水湖阶段;暖湿转干期（7.0～6.0 ka BP）,咸水湖阶段,亦是湖泊“成盐事件”的预备阶段;冷干期（6.0～4.7 ka BP）,盐湖阶段气候干湿交替,也是盐湖的成盐发展期;凉干期（4.7 ka BP至今）,是盐湖的成盐旺期,盐湖湖水不断缩减,加之周围沙漠的不断吞噬,盐湖开始由干盐湖向沙下湖发展。吉兰泰地区距今22 ka以来的古环境变化及气候转型,不仅是对全球古气候变化的响应,而且对盐湖矿产资源的成盐事件及区域可持续发展具有重要意义。According to quaternary geological investigation, sedimentary characteristic records and some comprehensive analysis of the study area and its adjacent areas, we take an exploratory analysis on the environment changing processes of Jilantai Salt Lake since 22 ka BP by using the analysis method of Sequence Stratigraphy. The evolution of the salt lake has experienced six stages： cold-dry period （22.0-14.0 ka BP）, freshwater lake period; cold-wet period （14.0-9. 782 ka BP）, Dryas period; warm-wet period （9. 782-7.0 ka BP）, saline water period; period of climate changing from warm-wet to dry （7.0-6.0 ka BP）, still saline water period, also the preparatory stage for the salt formation of the lake; cold-dry period （6.0-4.7 ka BP）, the climate alternating between wet and dry frequently, salt water period, also the salt formation developing period of the salt lake; cool-dry period （4.7 ka BP-）, it was the animated salt forming period, during which the lake water decreased rapidly and the around desert encroached, so the lake developed to sand covered lake gradually. The environmental change and climate transition in Jilantai area since 22 ka BP are responses to the global paleoclimate change, which have great significance in researches of salt resources formation events and the sustainable development of regional economy.

关 键 词：第四纪环境 气候转型 成盐过程 吉兰泰盐湖 

分 类 号：P532[天文地球—古生物学与地层学]