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Geoscience ›› 2025, Vol. 39 ›› Issue (02): 361-370.DOI: 10.19657/j.geoscience.1000-8527.2024.016

• Stratigraphy, Paleontology and Paleoenvironment • Previous Articles     Next Articles

Sedimentary Filling Processes of Quaternary Deposits in the Dachang Depression, North Hebei Plain

ZHANG Jinlong1(), PAN Zhilong1(), ZHANG Yunqiang2, ZHANG Huan1, HOU Dehua1, SHI Guangyao3   

  1. 1. Regional Geological Survey Institute of Hebei province (Geotourism Research Center of Hebei Province), Langfang, Hebei 065000,China
    2. Langfang Center for Integrated Natural Resources Survey, China Geological Survey, Langfang, Hebei 065000, China
    3. Hebei GEO University, Shijiazhuang, Hebei 050031, China
  • Online:2025-04-10 Published:2025-05-08
  • Contact: PAN Zhilong

Abstract:

The establishment of the Quaternary sedimentary framework in the Hebei Plain provides fundamental constraints for regional stratigraphic correlation and depositional environment studies. To further elucidate the sedimentary characteristics of Quaternary unconsolidated deposits in the Dachang Depression of northern Hebei Plain, this study integrates sedimentological analysis and paleomagnetic investigations with previous data from the Sanhe standard borehole (San9) in Langfang City. Eight Quaternary boreholes aligned along the NNE-trending axis of the depression were systematically analyzed through stratigraphic subdivision, sedimentary facies discrimination, and cross-section correlation, enabling comprehensive reconstruction of the three-dimensional geological architecture and fluvial-alluvial fan migration history. Analytical results demonstrate that the Quaternary deposits originated from synergistic interactions among the Baoqiu River, Ju River, and Duanjialing alluvial fan system. The San9 borehole reveals Early Pleistocene dominance by alluvial fan deposition under arid conditions. During the middle Pleistocene, warmer climate promoted enhanced drainage development, characterized by fluvial sedimentation with localized alluvial fan activity. Late Pleistocene witnessed gradual attenuation of north-south topographic relief, leading to alluvial fan contraction and widespread floodplain deposition by paleo-Ju and paleo-Baoqiu rivers. Holocene climate amelioration triggered pronounced fluvial incision, particularly along the paleo-Baoqiu channel. The current geomorphic configuration reflects stabilization phases of the Baoqiu-Ju river system and Duanjialing alluvial fan complex since the Late Quaternary.

Key words: Hebei Plain, Dachang depression, particle size analysis, Quaternary, three-dimensional geological structure

CLC Number: