中文摘要：

对哈尔滨2006年3月10日沙尘沉降物的化学组成及化学风化特征进行研究,结果表明：SiO2、Al2O3和TFe2O3含量分别为54.87%、13.27%和5.63%,三者之和达73.77%;CaO、MgO、K2O、Na2O、TiO2、P2O5和MnO含量分别为3.78%、2.57%、2.63%、1.76%、0.77%、0.24%和0.11%。沉降物中的常量元素多表现为迁移淋失,Mn和Ti明显富集而Mg和Fe轻微富集,元素的迁移淋失率依次为：Na〉P〉K〉Si〉Al〉Ca〉Fe〉Mg〉Ti〉Mn;微量元素除Nb、Sr迁移淋失外,其余元素表现出富集特征。与哈尔滨2002年沙尘沉降物、黄土高原第四纪黄土与古土壤、晚第三纪红粘土、镇江下蜀土及宣城风成红土等典型风成堆积物进行对比分析,（Al＋Fe＋Ti＋Mn）/（Mg＋Ca＋K＋Na）比值、成分变异指数ICV、CIA等化学风化参数及A-CN-K化学风化趋势图均显示,哈尔滨沙尘沉降物经历了低等化学风化程度,明显强于兰州黄土和古土壤,弱于洛川黄土,显著弱于洛川古土壤、西峰红粘土、镇江下蜀土和宣城风成红土。哈尔滨沙尘源区处于大陆化学风化的早期,气候生物状况好于西北地区,包括沙漠和黄土高原在内的西北地区不会是哈尔滨沙尘沉降物的物源区,或者至少不是主要物源区。

英文摘要：

The chemical compositions and chemical weathering characteristics of sand-dust weather deposits on March 10,2006 in Harbin were studied in this paper.Based on the comparison with other aeolian-dust deposits,i.e.sand-dust deposits on 2002 in Harbin,Quaternary loess-palesol and late-tertiary red-clay in the Loess Plateau,Xiashu loess in Zhenjiang and aeolian dust red earth in Xuancheng of Anhui Province,the results show that the content of SiO2,Al2O3 and TFe2O3 of sand-dust deposits on 2006 in Harbin is 54.87%,13.27% and 5.63% separately,which occupy 73.77% in all,and that the content of CaO,MgO,K2O,Na2O,TiO2,P2O5 and MnO is 3.78%,2.57%,2.63%,1.76%,0.77%,0.24% and 0.11% respectively.The most major elements in sand-dust deposits were migrated and leached,while the elements Mn and Ti were obviously enriched but Mg and Fe slightly enriched.According to the migration and leaching rate,the major elements are ranked in the following order：Na〉P〉K〉Si〉Al〉Ca〉Fe〉Mg〉Ti〉Mn.Except the elements Nb and Sr,other trace elements were enriched during the chemical weathering process.The chemical weathering parameters,such as（Al＋Fe＋Ti＋Mn）/（Mg＋Ca＋K＋Na） ratio,ICV and CIA,and A-CN-K chemical weathering trending diagram revealed that the sand-dust deposits in Harbin underwent lowlevel chemical weathering,which was evidently much stronger than that of the loess and palesol in Lanzhou,little weaker than that of Luochuan loess,and obviously weaker than that of Luochuan palesol,red-clay in Xifeng,Xiashu loess in Zhenjiang and aeolian-dust red earth in Xuancheng.The chemical weathering experienced by sand-dust weather deposits in Harbin was formed in sand-dust source regions.And it is showed that the climatic and biologic status of the sand-dust source areas of Harbin sand-dust deposit is much better than that of northwest areas,and the sand-dust source areas of Harbin sand-dust deposit is in the early stage of continental chemical weathering.The northwest area including desert and loess plateau will not b