《Table 1 Features and location of Precambrian rock samples beneath the Ordos Basin》

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《Potash–Forming Regularity of the Ordovician Marine Northern Shaanxi Salt Basin: Insight from Review and Prospect of the Deep Geology of the Ordos Basin》

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The Ordos Basin is a cratonic basin（Yang Junjie，2002）in the western NCC（Zhao Guochun et al.，2005）with a relatively stable sedimentary cover and a crystalline basement（Teng Jiwen et al.，2010）.Mesoproterozoic to Cenozoic unmetamorphosed strata overlie Archean to Paleoproterozoic metamorphic basement of the NCC（Yang Yongtai et al.，2005；Wang Zhentao et al.，2016）.Now there is a broad consensus that the NCC was formed by amalgamation of some micro-continental blocks（Zhao Guochun and Zhai Mingguo，2013）.A number of tectonic subdivision models were proposed to explain how many micro-continental blocks originally existed and when and how these micro-continental blocks were assembled to form the coherent basement of the NCC（Zhao Guochun and Zhai Mingguo，2013；Kusky et al.，2016）.A widely recognized model presented that the EW–trending Khondalite Belt separated the Western Block into the Yinshan Block in the north and the Ordos Block in the south（Fig.1a）.The basement of the Ordos Basin rarely outcropped due to the very thick sedimentary cover，and few boreholes penetrated into the basement.Thus，the composition and division of the basement of the Ordos Basin have been mainly inferred from the geophysical data，which is still uncertain in some extend（Wang Tao et al.，2007；Wang Zhentao et al.，2015）.Recently，the petrologic features and latest zircon U-Pb ages for the basement samples beneath the Ordos Basin added direct evidence for the study of the basement of the Ordos Basin（Table 1）.