地理科学 ›› 2002, Vol. 22 ›› Issue (5): 557-562.doi: 10.13249/j.cnki.sgs.2002.05.557

• 论文 • 上一篇    下一篇

泥河湾盆地东部中全新世晚期的干/冷干事件与中全新世湿润状况的结束

王红亚1, 汪美华1, 谢强1, 于澎涛2, 刘鸿雁1, 崔海亭1   

  1. 1. 北京大学城市与环境学系 北京 100871;
    2. 中国林业科学院森林生态环境与保护研究所 北京 100091
  • 收稿日期:2002-01-20 修回日期:2002-04-15 出版日期:2002-09-20 发布日期:2002-09-20
  • 基金资助:
    国家自然科学基金项目(49871074)。

Dry/cold-and-dry Events of the Late Mid-Holocene and Termination of the Mid-Holocene Wet Conditions in the Eastern Part of Nihewan Basin

WANG Hong-ya1, WANG Mei-hua1, XIE Qiang1, YU Peng-tao2, LIU Hong-yan1, CUI Hai-ting1   

  1. 1. Department of Urban and Environmental Sciences, Peking University, Beijing 100871;
    2. Institute of Forest Ecological Environments and Protection, Chinese Forestry Academy, Beijing 100091
  • Received:2002-01-20 Revised:2002-04-15 Online:2002-09-20 Published:2002-09-20

摘要: 对取自泥河湾盆地东部化稍营镇(114°36’E,40°18’N)附近一剖面以泥炭为主的沉积物做了AMS 14C测年、粒度、碳酸钙含量、碳酸盐中δ18O和δ13C组分、有机质含量、TOC、CN分析以及χlf和SIRM测量。结果表明,这些沉积物大致是在5320~3370 a B.P.堆积的;在5320~3600 a B.P.,气候仍较为湿润温暖;在3600~3460 a B.P.和3430~3400 a B.P.,有两次明显的干冷干事件。气候的这种波动,可能是中全新世湿润状况的结束过程。

Abstract: AMS 14C dating, analyses of grain-size, CaCO3 content, δ18O and δ13C in carbonates, content of organic matter, TOC content and C/N ratio, and measurements of χlf and SIRM are performed with sediments, consisting mainly of peat, from a profile near Huashaoying Town (114°36’E, 40°18’N), the eastern part of Nihewan Basin. The results indicate that these sediments were deposited mainly during 5320-3370 a B.P.; the climate was still rather humid and warm during 5320-3600 a B.P.; there was a marked dry/cold-and-dry event occurring respectively at 3600-3460 a B.P. and 3430-3400 a B.P. Such climatic fluctuations might be the terminating process of the mid-Holocene wet conditions.

中图分类号: 

  • P532