地理科学 ›› 2007, Vol. 27 ›› Issue (4): 512-518.doi: 10.13249/j.cnki.sgs.2007.04.512

• 论文 • 上一篇    下一篇

宁镇及宜溧地区全新世中晚期典型沉积相与5700a B.P.前后的气候突变事件

  

  1. 1. 南京大学地理与海洋科学学院, 江苏, 南京, 210093;
    2. 江苏教育学院地理系, 江苏, 南京, 210013;
    3. 贵池师范学院旅游系, 安徽, 贵池, 247100
  • 收稿日期:2006-04-20 修回日期:2006-11-13 出版日期:2007-07-20 发布日期:2007-07-20
  • 基金资助:
    国家自然科学基金重大研究计划(批准号:90411015)项目;南京大学测试基金项目资助

Representative Sedimentary Facies and Climate Sudden Event Occurred around 5700a B.P.since the Middle and Late Holocene in Ningzhen and Yili Region

SHI Wei, ZHU Cheng, WANG Fu-Bao, TIAN Xiao-Si, XU Wei-Feng   

  1. 1. Department of Urban and Resources Sciences, School of Geographical and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210093;
    2. Department of Geography, Jiangsu Institute of Education, Nanjing, Jiangsu 210013;
    3. Tourism Department, Guichi Normal College, Guichi, Anhui 247100
  • Received:2006-04-20 Revised:2006-11-13 Online:2007-07-20 Published:2007-07-20

摘要: 分析宁镇及宜溧地区中晚全新世典型剖面的地层划分与特征,采用R-Q型因子分析方法估算气候变化值,揭示5700a B.P.前后发生在本区的干燥降温异常气候突变事件。气候曲线与沉积相序列的对比分析表明,宝华山浅棕黄色砂土夹角砾层洪-坡积相是该突变事件背景下的产物,且该突变事件还具有全球变化区域响应的征候,林峰桥同期淤泥质层中Fe3+/Fe2+比和粘土百分含量异常值进一步印证了这一论断。

Abstract: Through analysis of characteristics of representative stratums in Ningzhen and Yili region since the middle and late Holocene,estimating the climate change values with the method of R-Q factor analysis,combined with the formation periods of the turves and buried ancient trees,we establish the comprehensively comparable chart between parts of the sequences of sedimentary facies and the transformed climate curve through pollen-spore since the middle and late Holocene.According to the comparison and contrast between macroscopical and microcosmical characteristics in sedimentary facies,a climate sudden event occurred around 5700 a B.P.has been exposed.The comparative analysis between climate curve and sequences of sedimentary facies indicates that the light brown and yellow sand,clay stratum with angular gravel in Baohuashan is the result of a dry and low temperature event,which possesses the characteristics reflecting the global change,furthermore,it is also confirmed by the clay content and Fe3+/Fe2+ value in the same term miry soil stratums in Ningfengqiao.

中图分类号: 

  • P532/P534.63+2