古地理学报 ›› 2017, Vol. 19 ›› Issue (4): 745-756. doi: 10.7605/gdlxb.2017.04.059

• 古今地理环境及人类文明 • 上一篇    

河北坝上丰宁黄土剖面记录的230 ka BP以来的环境演化*

毛欣1,2, 刘林敬1,2, 李长安3, 姜高磊1,2, 张玉芬4, 赵红梅1,2, 毕志伟1,2   

  1. 1 中国地质科学院水文地质环境地质研究所,河北石家庄050061;
    2 中国地质科学院第四纪年代学与水文环境演变重点实验室,河北石家庄 050061;
    3 中国地质大学地球科学学院,湖北武汉 430074;
    4 中国地质大学地球物理与空间信息学院,湖北武汉 430074
  • 收稿日期:2017-01-16 修回日期:2017-04-24 出版日期:2017-08-01 发布日期:2017-08-07
  • 通讯作者: 刘林敬,男,1982年生,中国地质科学院水文地质环境地质研究所助理研究员,主要从事第四纪地质与环境演变方面的研究。E-mail: liulj206@126.com。
  • 作者简介:毛欣,男,1989年生,中国地质科学院水文地质环境地质研究所研究实习员,主要从事第四纪环境演变方面的研究。E-mail: maoxin.iheg@hotmail.com。
  • 基金资助:
    *中国地质科学院基本科研业务费专项(编号: YWF201411)、国家自然科学基金项目(编号: 41602194)联合资助

Environmental evolution since 230 ka BP recorded by Fengning loess section in Bashang area of Hebei Province

Mao Xin1,2, Liu Linjing1,2, Li Changan3, Jiang Gaolei1,2, Zhang Yufen4, Zhao Hongmei1,2, Bi Zhiwei1,2   

  1. 1 Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,Hebei;
    2 Key Laboratory of Quaternary Chronology and Hydrological Environment Evolution, CAGS, Shijiazhuang 050061, Hebei;
    3 School of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei;
    4 Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,Hubei
  • Received:2017-01-16 Revised:2017-04-24 Online:2017-08-01 Published:2017-08-07
  • Contact: Liu Linjing,born in 1982,is a research associate of Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences. He is mainly engaged in researches on Quaternary geology and environmental evolution. E-mail: liulj206@126.com.
  • About author:Mao Xin,born in 1989,is a research assistant of Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences. He is mainly engaged in research on Quaternary environmental evolution. E-mail: maoxin.iheg@hotmail.com.
  • Supported by:
    Co-funded by the Basic Research Program of Chinese Academy of Geological Sciences(No; YWF201411) and the National Natural Science Foundation of China(No.41602194)

摘要: 河北坝上地区位于东亚季风气候边缘区,对气候变化响应敏感。丰宁黄土剖面为研究该区域长时间尺度的环境演化提供了理想材料。通过丰宁黄土剖面地球化学元素和磁化率分析,结合光释光测年结果,恢复了该地区230,ka BP以来的环境演化历史; 通过野外观察,识别出了S1古土壤之下发育的风化淋滤黄土层,探讨了S1古土壤发育时期的风化淋滤特征及其所揭示的气候变化问题。结果表明: (1)230,ka BP以来的磁化率记录可与深海氧同位素38阶段进行细节上的对比,表明丰宁黄土堆积区对全球气候变化有着积极的响应;(2)S1古土壤发育时期,由于受到强降水的影响,土壤中元素受到强烈淋溶从而向下迁移到L2黄土中,造成L2上部地球化学记录与磁化率的差异;(3)从S1古土壤顶部到钙结核层之间土壤属于酸性淋溶土,可能相当于现今中国北亚热带的黄棕壤,其剖面由土壤层、风化淋滤黄土层和CaCO3淀积层构成;(4)S1古土壤发育时期的温度和降水量与现今江苏泗洪和六合地区相当,表明当时研究区为亚热带气候。

关键词: 黄土, 古地壤, 磁化率, 元素地球化学, 古气候, 河北坝上

Abstract: Bashang area of Hebei Province,located in the peripheral region of the East Asian Monsoon,is sensitive to climate change. The Fengning loess section provides ideal materials for studying long-time environmental changes in this region. Combined with OSL dating results,elemental concentrations and magnetic susceptibility were determined to obtain the record of environmental evolution since 230 ka BP. Based on identification of weathering and leaching loess under S1 in the field,we also discussed weathering features in S1 paleosol and the relevant climate change. The results showed that:(1)Magnetic susceptibility record of the Fengning loess section coincided with marine isotope stage 3-8 perfectly,that indicated that the study area had given a sensitive response to globe palaeoclimatic changes since 230 ka BP;(2)Due to the impact of heavy rainfall in the period of S1 paleosol development, elements were strongly leached and migrated downward to L2 loess,resulting in the difference between geochemical records and magnetic susceptibility in the upper of L2 loess;(3)The Layer from S1 paleosol to calcrete belongs to acidic leached soil type that can be equivalent to yellow-brown soil developed at modern northern subtropics, and is consist of soil layer,weathered and leached loess layer and CaCO3 illuvium; (4)The temperature and precipitation in the period of S1 paleosol development were quite similar to those in Sihong area and Liuhe area of Jiangsu Province,that indicated that the climate of the study area was subtropical during the forming period of S1 paleosol.

Key words: loess, paleosol, magnetic susceptibility, geochemistry of element, palaeoclimate, Bashang area of Hebei Province

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