The loess covering on the northern slop of Tian Shan Mountains derives from the desert in Junggar Basin but the loess depositing in Iii Basin may come from the desert of Central Aisa and the lower reach of Iii River.

• 天山北坡黄土物质主要来源于其北部的准噶尔盆地中的沙漠，伊犁盆地黄土粉尘则来自中亚荒漠和伊犁河下游沙漠地区。