【摘要】 地质、地震测深、大地电磁测深、重磁场特征、古地磁和地球动力学环境均表明：高家窑－乌拉特后旗断裂以西的“北山晚华力西地槽褶皱带”（西阿拉善），基底为前寒武变质岩系组成，是前寒武就已经形成刚性陆壳的古陆块，是阿拉善古陆块的重要组成部分，属于塔里木－华北地台。阿拉善前寒武古陆块的北界（华北地台西段北界）应位于杭乌拉－雅干－额济纳旗北－六驼山断裂构造带（新厘定的槽台界线）。更多还原

【Abstract】 Geology,earthquack sounding, telluric electromagnetic sounding, weigh magnetic field character,palaeomagnetism and dynamic environment have indicated that the basement of "Beishan late Variscian geosyncline fold belt" (the west Alashan Banner)was composed of Precambrian metamorphic rock system,which has formed in rigid continental crust of the palaeolandmass that was a part of important Alashan Banner’s palaeolandmass,it belongs to Tarim - North China platform, in the west of Gaojiayao - Wulatehouqi fault. Alashan Banner of Precambrian the palaeolandmass of north boundary (the west of North China platform of north) seat in the fault structural zone of Hangwula-Yagan -the north Ejina Banner-Liutuoshan (new definition of geosyucline and platform boundary).更多还原