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Geoscience ›› 2021, Vol. 35 ›› Issue (05): 1332-1342.DOI: 10.19657/j.geoscience.1000-8527.2021.062

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Core Characteristics and Stratigraphic Classification of Borehole S9 in Sanhe, Hebei Plain

SHI Guangyao1,2,3(), PAN Zhilong3, ZHANG Huan3, LÜ Kexin4, ZHANG Jinlong3, ZHANG Yunqiang3, LI Qingzhe3, ZHANG Pengcheng3   

  1. 1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China
    2. China University of Geosciences, Beijing 100083, China
    3. Regional Geological Survey Institute of Hebei Province, Langfang, Hebei 065000, China
    4. Geophysical Exploration Academy of Hebei Province,Langfang, Hebei 065000, China
  • Received:2020-10-19 Revised:2021-06-20 Online:2021-10-10 Published:2021-11-04

Abstract:

Establishing Quaternary stratigraphic chronological framework is of great significance to regional stratigraphic correlation and paleogeographic environment reconstruction. According to the sediment colors, structures, and lithological characteristics of borehole S9 in the northern Dachang Depression, together with well-logging, paleomagnetism, 14C and OSL dating, detailed stratigraphic division, sedimentary facies, and stratigraphic chronological framework are established. This work focused on dividing the loose sediments of S9 into four assemblages: (1) diluvial fan deposit; (2) braided river deposit; (3) diluvial fan deposit; (4) flood plain and riverbed deposit. Paleomagnetic data show that the 0-145.3 m interval is Brunhes normal polarity chron, 145.3~212.6 m interval is Matuyama reversed polarity chron, and 212.6-251.8 m interval is Gauss normal polarity chron. Integrating the magnetostratigraphy, lithostratigraphic properties and 14C ages, we divided the Quaternary strata into the Lower Pleistocene, Middle Pleistocene, and Upper Pleistocene series, with depths of 210.9 m, 145.3 m and 24.05 m, respectively.

Key words: magnetostratigraphy, Quaternary, northern Dachang depression, AMS 14C dating, OSL dating

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