Relation between the formation of the Yellow River valley landforms from Gonghe, Qinghai to Lanzhou, Gansu and the uplifting in northeast part of Qinghai-Xizang plateau

According to a great deal of data measured practically in the typical area of the Yellow River valley from Gonghe to Lanzhou, and refering to the research results before , we propose that the valley landforms is formed by tectonic process under some conditions, and uplift rate of the valley landforms reflects two new tectonic events: one from 02 MaBP to 015 MaBP ,and another from 001 MaBP to present Since Quaternary, directing to northeast, the gradual reduction stress is indicated by the longitudinal section of the Yellow River terrace in QinghaiXizang plateau, the stress is disappeared in some period in Lanzhou