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现代地质 ›› 2015, Vol. 29 ›› Issue (2): 291-298.

• 地下水与气候变化 • 上一篇    下一篇

河北白洋淀老河头剖面25.5 ka BP以来气候环境变化的沉积记录

杨慧君1,2,王永1,迟振卿1,姚培毅1,董进1,田明中2,刘瑾1   

  1. (1.中国地质科学院 地质研究所,北京 100037;2.中国地质大学(北京)地球科学与资源学院,北京 100083)
  • 出版日期:2015-04-21 发布日期:2015-06-09
  • 通讯作者: 王永,男,研究员,1968年出生,第四纪地质学专业,主要从事第四纪地质和新构造研究。
  • 作者简介:杨慧君,男,硕士研究生,1989年出生,第四纪地质学专业,主要从事第四纪环境研究。 Email:yanghuijun99@126.com。
  • 基金资助:

    中国地质调查局项目“第四系全新统地层层序的建立”(1212011120142);“中国东部气候变化湖泊沉积记录研究”(12120113005600);“中国不同构造单元第四系标准地层柱的建立和精细对比”(1212011120118)。

Sedimentary Record of Climate Change During the Past 25.5 ka  of Laohetou Profile from Baiyangdian,Hebei Province

YANG Hui-jun1,2, WANG Yong1, CHI Zhen-qing1, YAO Pei-yi1, DONG Jin1, TIAN Ming-zhong2, LIU Jin1   

  1. (1.Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2.School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)
  • Online:2015-04-21 Published:2015-06-09

摘要:

基于河北省白洋淀地区老河头剖面沉积物的粒度组成与磁化率特征,结合6个AMS 14C测年结果,重建了该地区25.5 cal ka BP以来的气候环境变化历史。结果显示,25.5 cal ka BP以来可以划分为7个较大的气候阶段:25.5~20.9 cal ka BP (610~515 cm),沉积环境以微弱的流水沉积和风力沉积为主;20.9~10.7 cal ka BP (515~388 cm),该区河流作用减弱,风力堆积加强;10.7~8.6 cal ka BP (388~335 cm),该区降水增加,白洋淀湖泊面积扩大,水位升高;8.6~7.2 cal ka BP (335~299 cm),风力作用加强,以风力堆积为主;7.2~3.2 cal ka BP(299~200 cm),沉积环境以稳定的湖相沉积为主,后期流水作用增强;3.2~1.3 cal ka BP(200~110 cm),该区流水作用显著,有泛滥性的洪水在此期间出现;1.3 cal ka BP至今(110~0 cm)降水减少,但流水作用仍然明显。

关键词: 粒度特征, 磁化率, 环境演变, 白洋淀, 河北省

Abstract:

Laohetou profile is located in the west of Baiyangdian depression. A 610 centimeter-deep sediment profile was studied in this paper. The AMS 14C measured data revealed that the sediment profile deposited since 25.5 cal ka BP. Combined with chronological data, grain size characteristics, susceptibility and sedimentary characteristics, the evolutionary process and environment features during the past 25.5cal ka BP were reconstructed. Results showed that there were seven stages as following. 25.5-20.9 cal ka BP(610-515 cm) is a fluvial facies and wind accumulation period; in 20.9-10.7 cal ka BP (515-388 cm), fluvial action is weakened, and wind accumulation may be strengthened; in 10.7-8.6 cal ka BP (388-335 cm), precipitation increases and  water accumulates, lakes expanding during this stage; 8.6-7.2 cal ka BP (335-299 cm) is a wind accumulation period; 7.2-3.2 cal ka BP(299-200 cm) is a lacustrine facies period; 3.2-1.3 cal ka BP(200-110 cm)is a fluvial facies period; from 1.3 cal ka BP to now(110-0 cm),the precipitation decreases, but fluvial function is still obvious.

Key words: grain size characteristic, magnetic susceptibility, environmental evolution, Baiyangdian, Hebei Province

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