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

• 地层学 • 上一篇    下一篇

河北平原三河S9孔岩心特征及第四纪地层划分研究

石光耀1,2,3(), 潘志龙3, 张欢3, 吕可欣4, 张金龙3, 张运强3, 李庆喆3, 张鹏程3   

  1. 1.中国地质科学院地球物理地球化学勘查研究所,河北 廊坊 065000
    2.中国地质大学(北京),北京 100083
    3.河北省区域地质调查院,河北 廊坊 065000
    4.河北省地球物理勘查院,河北 廊坊 065000
  • 收稿日期:2020-10-19 修回日期:2021-06-20 出版日期:2021-10-10 发布日期:2021-11-04
  • 作者简介:石光耀,男,工程师,1988年出生,地质工程专业,主要从事第四纪地质与区域地质研究工作。Email: 452581032@qq.com
  • 基金资助:
    中国地质调查局基础调查项目(DD20160060);中国地质调查局基础调查项目(DD20160042)

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

摘要:

第四纪地层年代学格架的建立对区域地层对比及古地理环境演化研究具有重要意义。通过分析河北大厂凹陷北部第四系标准孔S9钻孔岩心沉积物颜色、结构构造、岩性组合特征,应用测井曲线、古地磁、AMS 14C和OSL测年方法,对S9钻孔剖面进行详细地层划分、沉积相分析和地层年代学格架建立。将S9孔揭示的松散沉积物分为4套岩性组合:第1套岩性组合代表洪积扇沉积;第2套岩性组合代表辫状河沉积;第3套岩性组合代表洪积扇沉积;第4套岩性组合代表泛滥平原沉积和河床沉积。通过对古地磁实验结果的分析得出, 0~145.3 m为古地磁极性带的布容正极性时,145.3~212.6 m为古地磁极性带的松山反极性时,212.6~251.8 m为古地磁极性带的高斯正极性时。以磁性地层为主导,以岩性地层特征、14C和OSL测年数据为辅,对S9孔第四纪岩性地层进行初步划分,其第四纪地层的下更新统、中更新统和上更新统的底界对应深度分别为210.9 m、145.4 m和24.05 m。

关键词: 磁性地层, 第四纪, 大厂凹陷北部, AMS 14C测年, OSL测年

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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