Altun Mountains

Altun Mountains

▪ mountains, China
Chinese (Pinyin)  A'erjin Shan  or  (Wade-Giles romanization)  A-erh-chin Shan,  Uighur  Altyn Tagh 

      mountain range in the southern part of the Uygur Autonomous Region of Xinjiang, northwestern China. Branching off from the Kunlun Mountains, the range runs for more than 400 miles (650 km) from southwest to northeast to form the boundary between the Tarim Basin (Tarim River) to the north and the minor basin of Lake Ayakekumu (Ayakkum) and the Qaidam Basin areas of interior drainage to the south.

      Geologically, the range is characterized by a right-lateral displacement of at least 60 miles (100 km) during the Cenozoic Era (i.e., during the past 65 million years) caused by an active strike slip of the Altyn Tagh Fault that runs parallel to the range on the south. The range falls into three divisions. The southwest section, bordering the Kunluns, is extremely rugged and complex; some ranges and peaks are higher than 20,000 feet (6,100 metres) and are perpetually covered with snow. The central portion, forming the border of the western Qaidam Basin, is lower, averaging about 13,000 feet (4,000 metres) in elevation, and is much narrower. The eastern section of the range joins the Qilian Mountains and has peaks that reach heights of 16,500 feet (5,000 metres); it is structurally more complicated, consisting of a series of short ranges, the axes of which gradually adapt to the main northwest-southeast axis of the Qilian Mountains.

      There are few rivers in this area because of its extreme aridity, particularly in its central section. In the west various small streams run off into the Takla Makan Desert in the north, Lake Ayakkum to the south, or the Qaidam Basin in the west. The Dangjin Pass, at the eastern end of the range, is traversed by a road that links eastern Xinjiang (via Gansu province), the Qaidam Basin, and the Tibet Autonomous Region (Tibet) (via Qinghai province).

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Universalium. 2010.

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