According to the statistical data of the previous geochronology results of the magmatic and metamorphic rocks around the periphery, compared the result of detrital zircon age near area and combined with the regional tectonic background, using the method of LA-ICP-MS, systematic studied the detrital zircon age from the upper sandstones of Upper Triassic Yanchang Formation of Ansai area in Ordos Basin. This paper discussed the material provenances of Chang 2 in research area. The results show that：the age of Chang 2 of Upper Triassic Yanchang Formation in Ansai area is not earlier than 230±2 Ma. The provenance is from the northern and northeastern parts of Ordos Basin and the group of 2 600～2 400 Ma indicates that its material provenances may mainly come from Yinshan Mountain and Daqingshan-Wulashan region, which corresponds to 2 500 Ma cratonization and large-scale magmatic events, the group of 2 000～1 800 Ma indicates that its material provenances may mainly come from Yinshan Mountain, Daqingshan-Wulashan Mountain and Jining region, which corresponds to the Lüliang Movement of the two scene rift basin closure and related to anorogenic magmatism and basement uplift. The group of Phanerozoic 380～350 Ma, 300～250 Ma, 250～230 Ma indicates that its material provenances may mainly come from Yinshan Mountain and Daqingshan-Wulashan region, which records the paleo-Asian Ocean rapid subduction events in the northern margin of the North China plate, which corresponds to Hercynian and Indosinian magmatic events.
Zhang Qian Li Hong Li Wenhou Zhang Mengting Liu Xi Luo Fenhong. Detrital zircon U-Pb dating of Triassic Yanchang Formation in Ansai area, Ordos Basin and its geological significance[J]. Chinese Journal of Geology, 2019, 54(2): 452-471.