From Nanhua to Early Sinian, the West Kunlun area and Tarim area experienced the process of pan-continental sedimentary evolution. The sediments are characterized by continental-coastal granitic coarse clastic conglomerate and lithic sandstone or feldspathic sandstone, with a thickness of 2,500-3,200m ... Some geologists believe that some of them are glacial deposits, and some documents mistake this set of sedimentary metamorphic conglomerate dominated by granite gravel for granite. In the Late Sinian, shallow-sea carbonate rocks were deposited with a thickness of 324 ~ 500 m, which was very regional and widely distributed in West Qinling, Qilian and Songpan-Ganzi areas. Early CAMBRIAN is composed of large sets of feldspathic sandstone, feldspathic quartz sandstone, argillaceous rocks and a small amount of complex conglomerate deposits, with a thickness of 31.52m; 270-meter-thick radiolarian siliceous rocks and siliceous slates appear at the top, which proves that there are framework organisms in this area. In addition, there are some intermediate-basic volcanic rocks in Ke Gang, which show the characteristics of oceanic crust trough basin.

Figure 6- 1 West Kunlun-Tarim Crustal Evolution Model

Siliceous rocks in Qialong area have good ore-bearing properties. Lead-zinc mineralization and silver mineralization have been found in radiolarian siliceous rocks and siliceous slate. It is preliminarily considered that the basic volcanic rocks in Ke Gang are the products of different stages in the same period. This study holds that the basic volcanic rocks and radiolarian cherts in this area represent the environment of ocean crust and rift basin (rift).