Core characteristics and stratigraphic classification of D1 borehole in the north of Daxing uplift

In order to establish the Quaternary stratigraphic framework of Daxing uplift, We have studied the stratigraphic division, sedimentary facies and chronostratigraphy of the D1 borehole core in the north of Daxing uplift.The loose sediments of D1 can be divided into three lithological sections in this paper.The lithological sections were sedimentary environment of diluvial fan, braided river, the flood plain and riverbed, respectively.The results of the paleomagnetic test show that the polarity boundaries of B/M and M/G in D1 borehole are 89.5 m and 132.25 m.According to the magnetostratigraphy, combined with the lithostratigraphic property and ¹⁴C dating data, we figured the boundaries of N/Q, Qp₁/Qp₂ and Qp₂/Qp₃ at the depth of 137.9 m, 91.4 m and 34.4 m, respectively.The research results provide basic data for the division and correlation study of Quaternary regional strata in this area.