地理科学 ›› 1990, Vol. 10 ›› Issue (4): 372-378,388.doi: 10.13249/j.cnki.sgs.1990.04.372

• 研究报道 • 上一篇    下一篇

鲁北平原浅埋古河道带基本特征

张祖陆   

  1. 山东师范大学地理系, 济南
  • 出版日期:1990-07-20 发布日期:1990-07-20
  • 基金资助:
    国家科学基金资助课题

ELEMENTARY CHARACTERISTICS OF SHALLOW-BURIED PALEOCHANNELS IN LUBEI PLAN

Zhang Zulu   

  1. Department of Geography, Shandong Teacher’s University, Jinan
  • Online:1990-07-20 Published:1990-07-20

摘要: 鲁北平原大致分布有三条浅埋古河道带,呈西南一东北方向平行展布,每带一般宽5-15km,最宽处达20km,沉积厚度在10-20m,最大40m,浅埋谷河道可分为两期,早期古何道形成于晚更新世晚期或全新世初期,晚期为全新世早一中期。古河道研究对本区经济开发,有着重要的理论意义和实践意义。

Abstract: The depth of shallow-buried paleochannels in Lubei(North Shandong Province)Plain are 8—60 meters underground.The paleochannels can be divided into three major paleochannel belts,which stretch parallelly from southwest to northeast.They are generally 5—15kin wide, the widest section reaches 20km.Sediments of the paleochannels are mainly composed of fine sand,silt or medium sand,usually 10—20 meters thick,the thickest 40 meters.The floor levels of the shallow-buried paleochannels consist of brown-yellow sandy clay or clay,the top levels grey sandy clay,clayey shad and mud. According to the characteristics of the paleochannel sedimental structure and the synthetic analysis of granularity,mineral and sporepollen data,the shallow-buried paleochannels can be divided into two sedimental stages.14C dating shows that paleochannels in the first stage in the lower sedimental cycle was formed about 25000—9500 years B.P.They are,the river traces from the last period of the Late Pleistocene to the early period of the Holocene.The sediments in the second stage was formed 9500—4100 years B.P.,the early-middle period of the Holocene.