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Sedimentology and Sequence Stratigraphy of Marine to Lacustrine Deltaic Deposits in a Craton Basin and Their Controlling Factors: Shan 2 Member–He 8 Member (Guadalupian–Lopingian, Permian), Southeast Ordos Basin, North China
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This paper was supported by the National Natural Science Foundation of China (Grant No. 41706063), the Basic Scientific Fund for National Public Research Institute of China (Grant No. 2017Q08) and the China Postdoctoral Science Foundation (Grant No. 2016M602087). Xin Shan thanks Yanan Miao, Dongxu Su, Jiao Wang for their assistance in the field. Three anonymous reviewers and the editors Dr Lian Liu and Dr Susan Turner are thanked for their constructive comments and suggestions on the manuscript.

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    Abstract:

    The Shan 2 Member, Shan 1 Member and He 8 Member of the Mid–Late Permian Shanxi and lower Xiashihezi formations, in the southeastern Ordos Basin, together comprise ~150 m of deltaic deposits. This sequence records an overall evolution from deep marine environment to shallow lake associated with braided river, braided river delta and meandering river delta. Core description, well log interpretation, and stable isotope analysis, including carbon, oxygen and strontium, were conducted to understand the sedimentary evolution of Shan 2 to He 8 Member. The Shanxi Formation, which consists of the Shan 2 and Shan 1 members, is characterized by a tidal-influenced meandering river delta environment and a higher δ13C value and 87Sr∕86Sr ratio and a lower δ18O value. The He 8 Member, the basal part of the Xiashihezi Formation, is featured by a braided river to braided river delta system and a lower δ13C value, 87Sr∕86Sr ratio, and a higher δ18O value. Four third-order depositional sequences separated by five sequence boundaries are determined. Coarsening upward sequences of the Shan 2 Member–He 8 Member indicate a general regression trend, which can be correlated to global sea-level fall occurring during the Roadian–Wuchiapingian, as also evidenced by previous published zircon U–Pb results. The coal-bearing sequence (Shanxi Formation) to non-coal-bearing sequence (He 8 Member), as well as a decrease of 87Sr/86Sr, suggest a trend from humid to arid climates. A combined effect of sea-level drop and a small uplift at the end of Shanxi Formation are proposed.

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SHAN Xin, YU Xinghe, Peter ?CLIFT, LI Yalong, JIN Lina, SU Dongxu, DU Yonghui, ZHOU Jinsong, HAN Xiaoqin.2018. Sedimentology and Sequence Stratigraphy of Marine to Lacustrine Deltaic Deposits in a Craton Basin and Their Controlling Factors: Shan 2 Member–He 8 Member (Guadalupian–Lopingian, Permian), Southeast Ordos Basin, North China[J]. Acta Geologica Sinica(),92(1):268-285

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History
  • Received:March 01,2017
  • Revised:May 17,2014
  • Online: February 09,2018
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