Stratigraphy and sedimentary facies of Borehole ACX03 at Langgu sag in Hebei Plain since the Late Pliocene
Li Rui-Jie1, Wang Qiang2, Zhao Yong1, Wei Bo1, Sun Yong-Hua1
1 Beijing Institute of Geological Survey,Beijing 100195,China; 2 Tianjin Center of Geological Survey, China Geological Survey(CGS),Tianjin 300170,China
Abstract：Base on the 14C age and magnetic stratigraphy of Borehole ACX03 with the depth of 300.0 m,and is located in the northeast part of Langgu sag,Hebei Plain,the Quaternary stratigraphic framework of borehole was established. Based on the core sediment, logging curves and micropaleontological characteristics,the paper divided sedimentary intervals and analyzed sedimentary environment of Borehole ACX03. The results show that: the B/M and M/G polarity boundaries of Borehole ACX03 are located at 83.8 m and 220.2 m,the age of the hole bottom is about 3.2 Ma,13 sedimentary intervals was divided. The Pliocene(220.2~300.0 m)in Borehole ACX03 was river and floodplain deposit which mingle Lakes deposit,the Lower Pleistocene(85.2~220.2 m)was river,lake and floodplain deposit,the middle Pleistocene(61.5~85.2 m)was branched channel deposit which mingle floodplain and interfluvial-limnetic deposit,the Upper Pleistocene(23.2~61.5 m)was floodplain and branched channel deposit,and the Holocene(0~23.2 m)was flood plain and curved-oxbow lake deposits. Comparison of the Quaternary strata of Borehole ACX03 and adjacent boreholes shows that the differential subsidence of the early Pleistocene is strongest,and then it gets weaker and weaker until the Holocene in Langfang-Gu’an area of Hebei Plain.
Li Rui-Jie,Wang Qiang,Zhao Yong et al. Stratigraphy and sedimentary facies of Borehole ACX03 at Langgu sag in Hebei Plain since the Late Pliocene[J]. JOPC, 2021, 23(3): 539-554.
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