The Quantified Estimate Of The Temperature From The Late Pliocene To The Early Pleistocene In Nihewan Basin-Based On The Statistics Of The Number Of Species Of Arviclinae

The Nihewan Basin with fluvial and lacustrine deposits of the Late Cenozoic is very important for researching Chinese Quaternary.Many important results on the palaeoclimatic change in this district have been achieved. It seems that almost all of informations of palaeoclimatic research, however, are qualitative, especially in estimating palaeotemperature.In Europe, using statistical methods, the simple linear regression of temperature and number of species of Arvicolinae, developed by S.Monture et al., has already been applied in Hungary, France and Spain etc., and many important results have been achieved, which are based on the relationship between the climatic parameters and species diversity.In this paper, it is tested whether it is possible that the model described above can be be applied in the Nihewan area, where there are several classical sections, the relationship between the layers of which has been established, in order to directly achieve the information of the successive quantified temperature in each period from the late Pliocene to the early Pleistocene and temperature changes in Nihewan Basin, based on the static result of Arvicolinae presented in each layers.It can be concluded in this paper that it is possible to apply the model developed by Monture et al. in the Nihewan Basin. The quantified results of the palaeotemperature illustrate that in the Nihewan Basin, the annual temperature maintained about 14℃in the late Pliocene, while in the early Pleistocene it fell to 8～9℃more or less, which shows a great downtrend, with little temperature fluctuation. And it is also shown that a large temperature falling episode occurred near the G/M boundary, with the temperature falling by about 14℃. And so did it near the B/M boundary, with the temperature falling less than the former.