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阿尔金断裂系是我国西北地区的一条重要构造带,也是中亚地区规模最大的走滑断裂系。它走向ENE,全长约1800km,构成青藏高原西北部的边界,其东侧联结祁连、柴达木及东昆仑,西侧为天山塔里木和西昆仑等构造带或地块。该带位于甘肃、青海和新疆三省区的交界处,主要发育元古界和中、新生界,局部地段分布有早古生代地层。由于自然条件等因素的限制,这一地区广泛分布的前中生代地层的时代确定一直缺乏生物依据。1996～1997年,笔者等在阿尔金地区地质考察时,于阿克塞附近发现了晚古生代放射虫化石。
The Altyn Tagh fault system is an important tectonic belt in northwestern China and is also the largest strike-slip fault system in Central Asia. It goes to ENE with a total length of about 1800km and constitutes the boundary of the northwestern part of the Qinghai-Tibet Plateau. Its east side is connected with Qilian, Qaidam and East Kunlun and to the west is Tazian Tarim and Western Kunlun tectonic belts or plots. The belt is located at the junction of Gansu, Qinghai and Xinjiang provinces and autonomous regions, the main development of the Proterozoic and Mesozoic, Mesozoic, Cenozoic, local area pre-Paleozoic strata distributed. Because of the natural conditions and other factors, the era of pre-Mesozoic strata widely distributed in this area has been lack of biological basis. From 1996 to 1997, the author found the Late Palaeozoic radiolarian fossils near Aksai during the geological investigation in the Altun area.