尕海DG03孔元素地球化学特征及其环境意义

Geo-chemical Characteristic of the Elements of Gahai DG03 Core and Its Environmental Significance

通过对柴达木盆地尕海DG03孔沉积物的Ti、V、Cr、Mn、Ni、Zn、C、N等元素含量变化以及m(C)/m(N)、m(Sr)/m(Ba)比值变化的测定,结合DG03孔沉积序列的年代学测定和沉积物分布特征,分析了尕海地区11·52ka BP以来的气候环境变化过程。研究表明尕海地区在11·52ka BP以来存在明显的气候波动;4·70kaBP以来的全新世晚期气候波动频率加大,存在5次较为明显的冷干和暖湿的气候旋回,并且表现出冷干气候时段长,暖湿气候时段短的特征。

Through the measurement of the variation of the element containing of Ti, V, Cr, Mn, Ni, Zn, C, N and the ratio change of the deposit of DG03 Core of Gahai Lake in Qhaidamu Basin, Combined with the chronological measurement of the deposit layer of DG03 Core of Gahai Lake and the characteristic of the deposit, the paper analyzed the climate environment change of Gahai Lake area since 11.52 ka BP. The research shows that since 11.52 ka BP, there is a huge change of the climate in Gahai Lake area. At the late of the New Age, since 4.70 ka BP, the changing ratio of the climate accelerated, with five distinctive cold-dry and warm-wet circles, and the characteristic of them are of long cold and dry period and short warm and wet period.