可可西里苟仁错湖泊沉积物元素地球化学特征及其环境意义  

Element geochemistry of lake sediment from Gourenco Lake, Kekexili, Qinghai-Xizang plateau and its significance for climate variation

作　　者：吴艳宏[1] 李世杰[1] 夏威岚[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所,江苏南京210008

出　　处：《地球科学与环境学报》2004年第3期64-68,共5页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(40071001)

摘　　要：　湖泊沉积物元素地球化学特征及其比值,有效地揭示了湖泊沉积物物源区的化学风化程度,已成为反映古气候波动的有效指标。根据可可西里苟仁错湖泊沉积物的元素地球化学特征,通过CIA,ICV等元素比值的结果,揭示该地区1400AD以来化学风化作用十分微弱,因此湖泊沉积物元素组成,对气候变化非常敏感。研究表明1400AD以来该地区气候经历多次冷暖波动,且呈干旱化的趋势,1420AD左右进入小冰期,其中1480～1520AD最为寒冷,1900AD后干旱化加剧。Element geochemistry of lake sediment has been widely used to detect climate change because that elements composition and their ratios reflect the weathering degree in the source area. According to the elements composition of lake sediment from Gourenco Lake, Kekexili, Qinghai-Xizang Plateau, CIA, ICV and other element ratios has been studied to understand the weathering sequence of this area since 1400AD. As the result, the weathering is very weak, so that the element composition change is more sensitive to climate change. The climate in this area fluctuated and tended to arid since 1400AD. The Little Ice Age began from 1420AD, and the coldest period was 1480～1520AD.

关 键 词：湖泊沉积物 元素地球化学 小冰期 化学风化 青海 可可西里 

分 类 号：P512.12[天文地球—地质学] P534.63