太湖8000年来沉积物元素变化特征及古环境指示

Variation of Elements in Sedimentary and Paleoenvironment Indicators during the Last 8 000 Years in Taihu Lake 

中文关键词:  太湖  地球化学元素  古环境

英文关键词:Taihu lake  Geochemical elements  Paleoenvironment

中文摘要:

      通过对太湖北部钻孔沉积物地球化学元素的测试分析,可以很好的反演太湖8 000年来沉积环境演变,大体可以分为4个阶段:1)8.0~6.6 kyr BP气候温暖湿润阶段;2)6.6~2.6 kyr BP气候趋冷及频繁波动阶段;3)2.6~1.5 kyr BP气候回暖阶段;4)1.5 kyr~现在,气候再次快速变冷阶段。认为两次暖湿阶段指示近8 000年来东亚季风两次明显的加强,此变化导致长江中下游湖泊在全新世期间两次明显的高水位期。

英文摘要:

      :Depending on the geochemical elements analyses of sediments in northern Taihu lake.We try to rebuild environmental change over the past 8 000 years.The evolution of sedimentary environments in Taihu lake can be divided into four stages:1) 8.0~6.6 kyr BP, the warm and wet period; 2)6.6~2.6 kyr BP, the deterioration and frequent fluctuations period; 3) 2.6~1.5 kyr BP, the warming period; 4) 1.5~now,rapid deterioration of the climate.Two warm and wet period mentioned in present paper may instruct that there were two obvious enhanced of the East Asian monsoon during 8 000 years,which led to the two distinct high-water period of lakes in the Yangtze River during the Holocene.