长江中游砂山的粒度特征及古气候环境意义  

Grain Size Characteristics of Aeolian Sand-Dune at the Middle Reaches of the Yangtze River and Its Paleoclimatic and Environmental Significance

作　　者：胡思辉[1] 袁胜元[1] 霍炬[1] 李长安[2] 

机构地区：[1]中国地质大学研究生院,武汉430074 [2]中国地质大学地球科学学院,武汉430074

出　　处：《地质科技情报》2006年第1期35-40,共6页Geological Science and Technology Information

基　　金：国家自然科学基金资助项目(40372097);中国地质大学(武汉)优秀青年教师计划资助项目(CUGQNL0324)

摘　　要：通过对江西梁家渡剖面的野外考察、系统采样和粒度测试,在与中原邙山黄土研究对比的基础上,分析和讨论了长江中游晚更新世风成砂堆积序列(江西梁家渡剖面)的粒度特征;并结合热释光年龄测试数据,按照安芷生等的粒度年龄模式获得相应的年代时间标尺,根据粒度与古气候环境之间的内在联系建立了长江中游地区晚更新世以来的气候环境演化序列;发现长江中游末次冰期以来至少发生过10次暖湿-干冷的气候旋回,其中还记录了发生在约22.0,29.5 ka BP的2次Heinrich事件。On the basis of field research, systematic sampling, testing of Liangjiadu section, Jiangxi Province and contrasting with Mangshan loess, the grain size features of the aeolian sand-dune sequence from Late Pleistocene, located at the middle reaches Of the Yangtze River, are analyzed and discussed in this paper. Combined with TL data, a time scale is established according to An Z S and Porter. S. C＇s grain-size age model. Then an environmental evolution sequence from Late Pleistocene is formulated for the middle reaches of the Yangtze River based on the inner connection between the grain size and palaeo-environment. It is discovered that there are at least ten times of warm-cold fluctuation during the last glacial period, which are still recorded in two Heinrich incidents, occured about 22.0 and 29.5 ka BP.

关 键 词：砂山 长江中游 粒度分析 末次冰期 古气候环境 

分 类 号：P532[天文地球—古生物学与地层学]