地理科学 ›› 1997, Vol. 17 ›› Issue (3): 253-258.doi: 10.13249/j.cnki.sgs.1997.03.253

• 论文 • 上一篇    下一篇

南京宝华山地区全新世沉积环境研究

朱诚1, 于世永1, 张兵2, 赵宁羲1, 严苏宁1, 王郡玉3, 任黎秀1   

  1. 1. 南京大学城市与资源学系, 南京210093;
    2. 昆明理工大学国土系, 昆明650093;
    3. 南京市人民中学, 南京210008
  • 收稿日期:1995-12-26 修回日期:1996-08-12 出版日期:1997-05-20 发布日期:1997-05-20
  • 基金资助:
    国家自然科学基金(批准号:49371063);高等院校博士点基金(编号:9428424);南京大学测试基金

STUDY ON HOLOCENE SEDIMENTARY ENVIRONMENT IN BAOHUASHAN AREA OF NANJING

Zhu Cheng1, Yu Shiyong1, Zhang Bing2, Zhao Ningxi1, Yan Su’ning1, Wang Junyu3, Ren Lixiu1   

  1. 1. Department of City & Resources Sciences, Nanjing University, Nanjing 210093;
    2. Department of Territory, Kunming Theory & Industry University, Kunming 650093;
    3. Nanjing People School, Nanjing 210008
  • Received:1995-12-26 Revised:1996-08-12 Online:1997-05-20 Published:1997-05-20

摘要: 南京宝华山地区两剖面沉积物及埋藏古树和炭化木等的孢粉、粒度、扫描电镜和地球化学、年代学测定分析表明,本区在全新世气候最宜期至少在(6588±192)aB.P.、(5720±80)aB.P.和(5410±120)aB.P.~(5145±84)aB.P.期间发生了规模较大的山地洪水,当时的自然景观主要为亚热带针阔叶混交林。本区剖面中上部是在亚北方期大约1000~850aB.C.的寒冷期中主要由风尘搬运的堆积物。本区剖面顶部的褐黄色砂质粉砂层则是在亚大西洋期(2450~1980aB.P.期间)于暖湿环境下形成的河漫滩相沉积。本区全新世最宜期的数次大洪水可能与气候——海面的短期振荡及突变事件有关。

Abstract: Analyses of sporo pollen,granularity,scanning electron microscope,geochemical and chronology for sediment and buried paleo trees reveal that at least the large mountain floods had ever occurred in 6588?192 a B.P.,5720?80 a B.P.and 5410?120 a B.P.-5145?84 a B.P.during the climatic optimum of the Holocene in this area.At that time,the natural landscape there was mainly subtropic coniferous broad mixed forest.The gray-yellow silt and yellow-brown silty clay layer with thickness of 1.1 m in Hepingchong profile was formed by dust transport and accumulation during the cold period (1000 BC-850 BC) in Subboreal Phase.However,the upper brown yellow sandy silt layer in the profile of the area was formed by alluvial flat facies deposits during the warm-humid environment of Subatlantic Phase(2450-1980 a BP).The several large floods occurred in the climatic optimum of the Holocene there were perhaps concerned in short oscillation and abnormal event between climate and sea surface.