南京林峰桥剖面记录的22600—18550aBP的环境演变信息  

INFORMATION OF ENVIRONMENTAL EVOLUTION DURING 22 600—18 550a BP INFERRED FROM THE LINFENGQIAO PROFILE, NANJING

作　　者：关勇[1] 朱诚[1] 

机构地区：[1]南京大学城市与资源学系,江苏南京210093

出　　处：《地层学杂志》2006年第4期351-355,共5页Journal of Stratigraphy

基　　金：国家自然科学基金重大研究计划(No.90411015);国家自然科学基金(No.40271103);南京大学重大基础预研项目;南京大学"985"自然地理学科建设与南京大学测试基金资助项目成果。

摘　　要：通过对林峰桥剖面的磁化率值,Rb、Sr含量和14C年代等的测定,发现在21070aBP前后,磁化率值异常增高,Rb/Sr比值降低,揭示出南京江北地区在这一时段,风化淋溶作用不强,可能经历了一次突然的气候冷干事件,与北半球广泛记录的Heinrich事件的H2同时期,可能是Heinrich事件在东亚季风区的又一响应。Analyses of the magnetic susceptibility, the content of Rb and Sr elemental geochemisty and ^14C dating of the Linfengqiao profile suggest that the magnetic susceptibility increases remarkably, and that the Rb/Sr ratio drops abruptly about 21 070a BP. These data indicate that during this period chemical weathering and eluviation were weak in the north bank of Yangtze River, possibly recording a cold-dry environment at that time. This cold-dry event may be coeval with the Heinrich2 event which is widely recorded in the Northern Hemisphere. Thus it may represent a climatic response of the Heinrich2 event in the eastern Asia monsoon area.

关 键 词：RB/SR 磁化率 林峰桥 南京 江苏 环境演变 HEINRICH事件 

分 类 号：P534.63[天文地球—第四纪地质学] P539.6[天文地球—古生物学与地层学]