青海扎陵湖和鄂陵湖盆地第四纪河湖相地层研究

A study of the Quaternary lacustrine strata in Zhaling Lake and Eling Lake basin of Qinghai Province

通过对扎陵湖和鄂陵湖沿岸的湖积阶地中湖相沉积的野外地质调查和实测剖面,对分布于盆地内的第四纪早更新世—全新世湖相地层进行了详细的研究和划分,重新厘定了该区第四纪岩石地层单元,确立了生物地层和年代地层序列。建立了青海东南部地区第四纪早更新世—全新世湖相地层单位—黄河源群(QH),黄河源群是由第四系下更新统野牛沟组(Qp1y)、中更新统鄂陵湖组(Qp2e)、上更新统大野马岭组(Qp3d)和全新统黑河乡组(Qhh)等4个组组成。为青藏高原湖泊演化、气候变化、古地理变迁研究,以及第四纪地层的划分与对比等提供了新资料。

Based on field geological work and section survey of the lacustrine strata in the lacustrine terrace around the bank of the Zhaling Lake and the Eling Lake,the authors studied and divided the strata,defined the rock and stratigraphic units,set up the biostratigraphic and chronostratigraphic sequence of Early Plestocene-Holocene epoch in the study area.The Huangheyuan（QH）stratigraphic unit and the Early Pleistocene-Holocene lacustrine strata in southeastern Qinghai were established.The Yellow River Source Group（QH）stratigraphic unit was divided into four formations,i.e.,the Yeniugou Formation（Qp1y）of Lower Pleistocene,the Elinghu Formation（Qp2e）of Middle Pleistocene,the Dayemaling Formation（Qp3d）of Upper Pleistocene and the Heihexiang Formation（Qhh）of Holocene.The results provide new data for the lake evolution in Qinghai-Tibet plateau,the climate variation,the paleogeographic changes,and the division and correlation of Quaternary strata in Qinghai-Tibet plateau.