地理科学 ›› 1998, Vol. 18 ›› Issue (4): 349-354.doi: 10.13249/j.cnki.sgs.1998.04.349

• 论文 • 上一篇    下一篇

临夏盆地早更新世东山古湖沉积的高分辨率气候记录

王建力1, 李吉均2, 方小敏2   

  1. 1. 西南师范大学地理系, 重庆 630715;
    2. 兰州大学地理科学系, 兰州 730000
  • 收稿日期:1996-12-10 修回日期:1997-05-16 出版日期:1998-07-20 发布日期:1998-07-20
  • 基金资助:
    国家自然科学基金;八五“攀登”计划资助;西南师范大学博士启动基金

EARLY PLEISTOCENE OF LACUSTRINE HIGH RESOLUTION CLIMATE OF DONGSHAN LAKE IN LINXIA BASIN

Wang Jianli1, Li Jijun2, Fang Xiaomin2   

  1. 1. Geographical Department of Southwest Normal University, Chongqing 630715;
    2. Geography Department of Lanzhou University, Lanzhou 730000
  • Received:1996-12-10 Revised:1997-05-16 Online:1998-07-20 Published:1998-07-20

摘要: 临夏盆地东山古湖(2.35~1.65MaB.P.)沉积厚达84m,是六盘山以西早更新世湖相沉积的典型代表。以2.5m的间隔对其进行系统采样,以CaCO3含量变化为指标建立高分辨率的气候变化曲线,对曲线进行周期分析表明,东山古湖所反映的气候波动具有明显的41000a主导周期;其中2.28MaB.P.和1.75~1.80MaB.P.时段为两个明显的冷湿时期,表明东亚季风在建立初期具有不稳定性。

Abstract: A total of 3267 carbonate samples were taken with 2.5 cm interval from 84 m thick lacustrine deposits in Linxia Basin. The carbonate content is employed as a proxy of climate records. The spectrum analysis results show that in the period of 2.35-1.65 Ma B.P., the paleoclimate had a clear 41000 a dominant periodicity, suggesting that the earth’s obliquity change was the main cause of climate change over this period. The results also show there were two obvious humid periods happening at 2.28 Ma and 1.75-1.80 Ma B.P. respectively, suggesting that the monsoon climate was not stable in the Early Pleistocene.

中图分类号: 

  • P532.42