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《JOURNAL OF ARID LAND RESOURCES AND ENVIRONMENT》 1998-01
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THE GEOCHEMICAL RECORD OF PALEOCLIMATE DURING ABOUT 7.0Ma-0.73Ma IN LINXIA BASIN,GANSU PROVINCE

Zhong Wei (Department of Geography,Xinjiang Uni.,Urumqi 830046) Li Jijun Zhu Jiunjie Fang Xiaomin (Department of Geography Science,Lanzhou Uni.,Lanzhou 730000)  
The cenozoic sediment in Linxia basin,which locates at the northeastern fringe of Tibet plateau bears abundant informations on the plateau's uplifts and paleoclimate.The fluctuations of geochemical elements show that those with the same or similar geochemical nature fluctuated identically.The hydro-thermal sequence revealed by oxides during about 7.0Ma-0.73Ma can be divided into several stages,i.e,about 7.0Ma-5.35Ma although it alternated with cold-dry and warm-wet periodes,it generally appeared a mild and stable climate regiem;till to 5.35Ma, a worldwide cold peak occurred.Afterwards,climate stepped into a period characterized by frequent and drastical alternation of cold-dry and warm-wet regiem,which may be related to the beginning of the uplift of the whole Tibet plateau,and resulted in the unstable establishment of east Asia monsoon at this time.Two severe tectonic movement occurred at 3.4Ma and 2.90Ma perhaps made the plateau upheave to an important critical altitude(1500-2000m),and led up to the stable establishment of east Asia monsoon.During 2.4Ma-1.67Ma,geochemical contents changed mildly,climate is characterized by cold-wet state,lacustrine sediment developed continually.At about 1.60Ma,the Tibet plateau uplifted again,and resulted in the Huanghe river headward erosin aggravated,at last cut through Linxia basin,dried out lake water.At this time,the huge plateau had obstacled the moisture current from the south,and made the inland continent tended to drought,the temperate desert began to develop wildly and eolian loess accumulated arround it.The alternation of loess and paleosoil represented cold-dry and warm-wet regiem respectively.So the fluctuation of geochemical contents and the paleoclimatic features revealed by them are of profound tectonic and environment background. \ \
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【CateGory Index】: P59,P532
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