甘肃第四纪气候期划分

The Division of Quaternary Climate in Gansu Province

第四纪时期气候变化是由冷和暖及干和湿组成的。冷和暖及干和湿是相对的，是呈循环变化的，是有强、弱之分和持续时间长短不同的。本文根据第四纪地层中植物孢粉和ＣａＣＯ３的含量及岩石风化系数、黄土中古土壤、第四纪泥炭的造炭期等资料，通过分析研究，用比拟方法确定第四纪气候期的性质，用冷和暖及干和湿作为第四纪气候期划分的尺度。将第四纪气候期划分为四次温暖期、五次寒冷期、一次冷热频繁交替期。

The changes of quaternary climate are made up of cold or warm and arid or moist.Cold or warm and arid or moist are relativity and change cyclely,they have distinguish of powerful or weak and the time lasted are different. This paper based on the palyno of plants,the content of the calcuiun carbonate and weathering coefficient of rocks in quaternary strata,the paleosol in the loess the means of the peatstage of quaternary peat by analysing and researching,using comparision to definite the characters of the division of quaternary climate,using cold or warm and arid or moist as the yardstick of the division of quaternary climate,.We divided the quaternary climate into three parts:four warm stage,five cold stage,one cold and warm stage alternately frequently.