在锡铁山地区识别出了4期洪积扇，DEM图提取到Fan3洪积扇的最大水平

Four-stage alluvial fans were identified in the Xitieshan area. The DEM map showed that the maximum horizontal displacement of the Fan3 alluvial fan was 150m, the maximum horizontal displacement of the Fan2 alluvial fan was 38m, and the maximum displacement of the Fan1 alluvial fan was 6.5. m. The average age of Fan3 landform in this area is (34.3±3.3) ka, the age of Fan2 landform is (11.6±1.0) ka, and the geological age of Fan1 landform is (3.2±0.3) ka. Compared with other scholars' analysis and collation of the research results of the alluvial fan in the northern Qaidam Basin, the average geological age of Fan3 alluvial fan in the northern Qaidam Basin is about 40 ka, and that of Fan2 alluvial fan is about 12 ka The average age of Fan1 alluvial fan is about 3.5ka. The age of the alluvial fan in the Xitieshan area is basically consistent with the development time of the alluvial fan in the region, indicating that the northern region of the Qaidam Basin was a large-scale regional uplift during the same period, and the uplift activity was synchronous and recurrent.

In the Tin Iron Mountain area, the 4th flood fan was identified, the maximum horizontal displacement of the DEM figure extracted to Fan3 flood fan was 150m, the maximum horizontal displacement of Fan2 flood fan was 38m, and the maximum displacement of Fan1 flood fan was 6.5m. The average age of Fan3 geomorphology in the area obtained by the OSL measurement is (34.3 to 3.3)ka, fan2 geomorphological age is (11.6 to 1.0)ka, and Fan1 geomorphological surface is the geological age of (3.2 to 0.3)ka. The analysis and collation of the research results of the flood fan in the northern part of the Chaidamu Basin compared to other scholars are found to be that the geological average age of Fan3 flood fan in the northern part of the Chaidamu Basin is about 40ka, the average geological age of Fan2 flood fan is about 12ka, and the geological average age of Fan1 flood fan is about 3.5ka. The age of the flood fan in the Tin Iron Mountain area is also basically in line with the time of the development of the regional flood fan, which indicates that the northern part of the Chaidamu Basin was a large-scale regional uplift in the same period, and the uplift activity was contemporaneous and recurrent.

The maximum horizontal displacement of fan 3 is 150 m, that of fan 2 is 38 m, and that of fan 1 is 6.5 M. The average ages of fan3, fan2 and Fan1 are (34.3 ± 3.3) Ka, (11.6 ± 1.0) Ka and (3.2 ± 0.3) Ka respectively. Compared with the analysis and collation of other scholars' research results on the alluvial fan in the northern Qaidam Basin, it is considered that the average geological age of fan3 alluvial fan is about 40 Ka, that of fan2 is about 12 Ka, and that of Fan1 is about 3.5 Ka. The age of the alluvial fan in Xitieshan area is basically consistent with the development time of the regional diluvial fan, which indicates that the northern Qaidam Basin is a large-scale regional uplift in the same period, and the uplift activity has synchronization and recurrence.<br>