三、柴达木盆地日基底性質和表層褶皺在柴达木厚达1000公尺的中、新生代沉積之下的盆地基底,以往被認为是“加里东褶皺基礎”(黄汲清),而且“阿尔金山中的褶皺構造可能与盆地基底是一致的”(張文佑)。形成这种看法的主要原因是把柴达木边緣的变質岩系認为是下古生代的“南山系”。1956年地質部石油普查隊在祁連山南麓發現了 Basal Basal Nature and Surface Folds of the Qaidam Basin Basins of the Meso-Cenozoic sediments under the Qaidam thickness of 1,000 meters were previously considered to be the “basis of the Caledonian fold” (Huang Jiqing) Moreover, “the fold structure in the Altun Mountains may be consistent with the basement of the basin” (Zhang Wenyou). The main reason for the formation of this view is that the metamorphic rocks on the margin of the Qaidam are interpreted as the “Nanshan line” of the Lower Paleozoic. In 1956, the petroleum census team of the Ministry of Geology was discovered in the south of the Qilian Mountains