| Citation: | SHI Guangyao, PAN Zhilong, LI Qingzhe, LYU Kexin, ZHANG Jinlong, ZHANG Huan, ZHANG Yunqiang, ZHANG Pengcheng, YAN Hao. 2023. Core characteristics and stratigraphic classification of D1 borehole in the north of Daxing uplift. Geological Bulletin of China, 42(12): 2132-2141. doi: 10.12097/j.issn.1671-2552.2023.12.009 |
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.
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The location of borehole D1 and tectonic sketch map
The lithological column, step resistivety logging curves and sedimentary environment interpretation in the borehole D1
Orthogonal vector plots showing the results of representative specimens from the borehole D1
The contrast diagram of magnetostraphy of the borehole D1 with standard polarity zones
Geomagnetic polarity timescale comparison of the borehole D1 with Beijing PGZ05 borehole