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沙井子断折带位于陕甘宁盆地西缘隆起南段东侧,在甘、宁交界处,北起环县萌城,南至平凉,东以萌城——车道坡大断裂(即一号大断裂),西以青龙山——彭阳大断裂(即二号大断裂)为界,南北长180公里,东西宽10—20公里,面积约2000平方公里(图1)。陕甘宁盆地西缘隆起,北起桌子山,南到陇县,以其极为突出的南北向断裂、折皱,构成了中国东部地台区的北东向构造线和中国西部地槽区的北西向构造线的天然分界,早就引起了广大地质工作者的注意。但由于各家从不同的观点出发,对本区大地构造的认识和构造单元的划分、命名,则莫衷一是,众说纷纭。
The Shajingzi fault zone is located on the east side of the uplifted southern segment of the western Shanxi-Gansu-Ningxia basin. At the junction of Gansu and Ningxia, it starts from Mengcheng in Huanxian to the north and to Pingliang in the south, In the west, Qinglongshan-Pengyang large fault (ie, No. 2 large fault) is bounded by a boundary of 180 km north-south and 10-20 km east-west, covering an area of about 2,000 km 2 (Figure 1). The uplifting of the western margin of the Shanxi-Gansu-Ningxia basin leads to the north of the Table Mountain and the south to Longxian. With its extremely prominent north-south faults and creases, it forms the northeast tectonic line of the eastern Taiwan platform area and the northwest of the western China terrain area The natural boundary to the tectonic line has long aroused the attention of the general geological workers. However, due to different opinions from different points of view, the understanding of the geotectonic structure and the division and naming of structural units in this area are not entirely consistent with different opinions.