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On the basis of outcrop, drilling cores seismic, logging and geochemical data, the main sequence boundary surfaces of the Yan'an and Zhiluo Formation of Jurassic on the northeast margin of Ordos basin were systematically studied. On outcrop profiles and drilling cores, the sequence boundary surfaces show characteristics of iron weathering crust, truncation and lithologiclithofacies transformation. On seismic profiles, the boundaries are featured by onlap, downlap and truncation. The rock-electricity relation indicates different types of mutations. The trace elements also show mutation characteristics. Ten different orders of sequence boundaries were identified, including three I-type(TSB1-TSB3)and seven Ⅱ-type(SB1-SB7)sequence boundary surfaces. Ⅰ-type boundaries include TSB1 sequence boundary surface between Yan'an(J1-2y)and Yanchang Formation(T3y), corresponding to Ty in seismic profiles; TSB2 sequence boundary surface between Yan'an(1-2y)and Zhiluo Formation(J2z), corresponding to Tz-1 in seismic profiles; TSB3 sequence boundary surface between Jurassic and Lower Cretaceous, corresponding to Tk in seismic profiles. As regional unconformities, Ⅰ-type sequence boundaries including TSB1, TSB2, TSB3 reflected tectonic activity during Mesozoic period. The Ⅱ-type sequence boundaries were main climate transformation surfaces and showed the cyclic changes in climate factors. The vertical variations of values of Sr, Cu, Sr/Cu, FeO/MnO and Al2O3/MgO indicate that the paleoclimate and paleoenvironment experienced a changing process from warm-humid climate to dry-wet alternation, arid and semi-arid climate; TSB2 and SB6 were main climate transformation surfaces. Vertical zonation of stratigraphic structure is obvious between Yan'an and Zhiluo Formation on the 3D models of the study area. The uranium bodies mainly lie in the large sandstone overlying TSB2 sequence boundary surface, in the form of plate on the 3D models of sandstone and uranium mineralization bed. The uranium bed was obviously influenced by the vertical zonation of stratigraphic structure and paleoclimate transformation. The integrated identification of sequence boundaries will not only reduce the casualty of artificial empirical recognition but also provide a basis for the division of Jurassic sequences and the establishment of isochronous sequence stratigraphic framework. The research on space-time attributes and the indicated geological meanings of the main sequence boundary surfaces will be helpful to revealing the process of "Yanshan movement" and its influence on the paleoclimate transformation and sandstone-type uranium mineralization.
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Simplified geological map of Dongsheng area on the northeastern margin of Ordos basin (a) and tectonic division of the study area(b, modified from Yang Junjie and Pei Xigu, 1996)
Sequence classification and main sequence boundary surfaces of the Jurassic in the Daying area on the northeastern margin of Ordos basin
Outcrop profiles characteristics of sequence boundary surfaces from Yan'an Formation to Zhiluo Formation in the Gaotouyao and Shenshangou area on the northeastern margin of Ordos basin
Stratigraphic correlation profile of Jurassic and lower Cretaceous in the Wanlichuang-Chaideng area, the northeastern margin of Ordos basin (PM2, Direction NE-SW
Types of reflection termination and sequence boundaries identification of the Jurassic Yan'an—Zhiluo Formation on seismic profiles in the Daying area, Ordos basin
Electrical properties of sequence boundary surfaces from the Jurassic Yan'an Formation to Zhiluo Formation in the Daying area, Ordos basin
Characteristics of the main sequence boundary surfaces and stratigraphic structure of the Jurassic Yan'an and Zhiluo Formation in the Daying area, Ordos basin (No. 15 exploration line)
Apparent resistivity profile of the Jurassic Yan'an and Zhiluo Formation in the Daying area, Ordos basin (No. 19 exploration line)
Trace elements ratios characteristics of main Jurassic sequence boundary surfaces on the northeastern margin of Ordos basin (modified from Zhang Tianfu et al., 2016)
Variable trend map of ICV, CIA & Ce for Yan'an Formation and Zhiluo Formation on the northeastern margin of Ordos basin(All of 28 mudstone and siltstone samples from Shen Shangou area, the northeastern margin of Ordos basin; modified from Zhang Tianfu et al., 2016)
Models of 3D stratigraphic structure and grid map on the northeastern margin of Ordos basin(based on 3200 drill holes, average drilling grid 2km×2km)
3D models of sandstone and uranium mineralization bed of Zaohuohao uranium deposit on the northeastern margin of Ordos basin (based on 195 drill holes, average drilling grid 200 m×200 m)
The variation of sporopollen content of the Yan'an Formation and Zhiluo Formation in Shenshangou area, the northeastern margin of Ordos basin (modified from Sun Lixin et al., 2017)
Sedimentary facies profile of the Yan'an and Zhiluo Formation in the Husiliang—Nalinxili area, the northeastern margin of Ordos basin (PM01)