Qilianshan (Qilian range) is one of the largest mountains in China which is a typical Caledonian geosyncline in the kunlun-Qinling geosyncline -fold system,Its structure units are as follows (from N.to S.):(1)The Hexizoulang (Hexi corridor) marginal geosyneline fold belt,with Lower Palaeozoic Group about several thousands m thick,containing small amount of volcanic rocks;(2) The North Qilianshan eugeosyncline fold belt,with Lower Palaeozoic Group of thickness ranging from 20000 to 30000 m,contai- ning large...
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