Sequence stratigyaphy and lithofacies palaeogeography evolution of the Upper Paleozoic in central-southern Ordos Basin
LI Keyong1, YANG Wenpeng1, XU Shuaikang1, LI Wenhou2
1 School of Geology and Environment/Periodical Center,Xi'an University of Science and Technology,Xi'an 710054,China; 2 Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China
Abstract：In order to classify the stratigraphic sequence characteristics and lithofacies palaeogeography evolution of the Upper Paleozoic in the central-southern Ordos Basin,the development and variation characteristics of lithology,paleostructure and transgression direction of sequence boundary and system tract interface were analyzed by using field outcrops and drilling logging facies in the basin. The characteristics of sequence development and lithofacies palaeogeography evolution were summarized. The results showed that the regional unconformity surface and transgressive direction conversion surface of different weathering sequences were the second-order sequence boundary,and the regional regression surface, scouring surface and subaerial exposure surface are the third-order sequence boundary. The sand flat of intertidal zone and the top of coastal transgression gravelly sandstone were transgression surfaces,and the typical lithology of the maximum transgressive surface were limestone,shale and coal seam,which were the interface between transgressive systems tract and highstand systems tract. The Upper Paleozoic includes two second-order sequences MSQ1 and MSQ2,and six third-order sequences SQ1,SQ2,SQ3,SQ4,SQ5 and SQ6. Among them,SQ1-SQ2 did not develop lowstand systems tract,but only develop transgressive systems tract and highstand systems tract,and SQ3-SQ6 developed complete lowstand-transgression-highstand systems tract;The lagoon-barrier coastal sedimentary system developed in SQ1,the tidal flat sedimentary system developed in SQ2 and the transitional delta sedimentary system developed in SQ3. In the early stage of SQ4,the downcutting sand body developed in the lowstand systems tract. In the late stage of SQ4,the sedimentary environment evolved from warm and humid reduction to hot and dry oxidation environment. In the early and middle stages of SQ5-SQ6,the delta front developed in the oxidation environment,and in the late stage of SQ6,the tidal flat developed in the highstand systems tract with transgression interlayer. The investigation provides a theoretical basis for the study of sequence and lithofacies paleogeographic evolution in the Ordos Basin as well as in other basins.
LI Keyong,YANG Wenpeng,XU Shuaikang et al. Sequence stratigyaphy and lithofacies palaeogeography evolution of the Upper Paleozoic in central-southern Ordos Basin[J]. JOPC, 2023, 25(1): 75-92.
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