Study On Change Of Paleoclimatic Climate Of Late-pleistocene In Course Of Sediment In The North Of Dabie Mountain

The condition of environment controlled the sediment to airslake, schlep, aggradation and the character of geochemistry in course of making the new soil or new rock. In stratum the elements moving or congregating ware affected by the weather, the landform, the character of original materialize and the speciality of elements at the same time. However the content and distribution of elements in stratum could present the informations of paleo-environment and paleo-climate. It is abroad to distill the informations of paleo-environment and paleo-climate and forecast evironment or climate in the future.Dabie mountain which is importance part of Qinlin and Dabie cordillera results in the zoology and climate of the south of China being different from the north . The north of Dabie Mountain is in the east of china and is the part of the Huaihe source area with Tongbo Mountain. This area's study is important and haves great science meaning for understanding the climate's and environment's change of the east of china for there being few similar study in this region.This objective studys the loess-paleosol of GS section which is in the north of Dabie Mountain(the Henan ProvinceGuangshan County).Passing the field reviewing, observation and experimentations, I choose some climate substitution targets which include the geochemistry, Magnetic susceptibility, the organism of soil and the PH of soil to study and analyze environment and climate. Through researching and comparing these climate substitution targets, this article discusses characteristices of environment of loess-paleosol soil deposition and climate clearerly late- Pleistocene in north Dabie Mountain. It mainly obtains following several results:First,It had mixed characteristics of aggradation in wind or water,but in wind primarily in GS section in the north of Dabie Mountain . According to the Dabie Mountain mineral analysis with the Henan geological prospectingmaterial we can infer the lowest plane of GS section to form in late-pleistocene (125,000 years) around.Second, by synthetically analysing climate substitution targets we find that the climatic change general trend: Temperature changed from cold to warm and from warm to cold, humidity changed from moist to relatively arid and from relatively arid to moist, the deposition period partner has the climate undulation which the frequent certain scope changed in cold or warm and does wet cycles inturn. Especially from GS-3 to GS-8 level undulation was specially most obvious, for example the climate of the GS-3 level (approximately 7.4m) appeared suddenly change in transitoriness.Third, Separately using Fe³⁺/Fe²⁺ and magnetic susceptibility to calculated the ancient temperature, the comparative analysis obtains that the temperature of this region changed from 4.30℃to 34.67℃,also generally was not higher than the nowadays yearly average temperature since late-pleistocene.Fourth, By using the magnetic susceptibility we can infer that the rainfall distributinged between 99.2mm and 839.53mm and the average rainfall was 354.14mm in GS section plane deposition period. Comparing with Guangshan County yearly average precipitation 1300mm the revised results would be more reasonable to be utilize than before.