淮河上游全新世黄土及其沉积动力系统研究  

Holocene Loess and its Deposition Dynamics in the Upper Reaches of the Huaihe River

作　　者：何忠[1,2] 黄春长[1] 周杰[3] 庞奖励[1] 李新艳[4] 王利军[1] 隆浩[5] 

机构地区：[1]陕西师范大学旅游与环境学院,陕西西安710062 [2]南京大学地球科学与工程学院表生地球化学研究所,江苏南京210083 [3]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西西安710075 [4]中国科学院南京地理与湖泊研究所,江苏南京210008 [5]中国科学院青海盐湖研究所释光实验室,青海西宁810008

出　　处：《中国沙漠》2010年第4期816-823,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(40771018);中国科学院地球环境研究所黄土与第四纪地质国家重点实验室项目(LQ0705)资助

摘　　要：对淮河上游禹州YPC剖面与陇东XJN剖面和关中盆地JYC剖面黄土沉积物进行的分析对比,发现淮河上游地区全新世黄土土壤剖面与陇东和关中盆地具有相同的沉积和成壤变化过程,但磁化率明显低于陇东和关中盆地,而粒度明显比陇东和关中盆地粗。分析认为,淮河上游和黄土高原地区分属不同的风力系统,有不同的粉尘源区。淮河上游是近源风尘沉积物,粉尘主要来源于黄河下游泛滥平原的风沙地带。其粉尘产生和搬运的动力与黄土高原显著不同,它主要是冬半年华北平原盛行的东北风力系统。The dust source and transporting system are two indispensable aspects in the process of loess-paleosol accumulation. It has been proved that the dust of the Loess Plateau mainly come from the northwestern inland Gobi and Desert, transported by the Asia monsoon systems and Westerlies. However, there are little researches with respect to the dust source and deposition dynamics of upper reaches of Huaihe River. In the present study, we investigated and collected a section （YPC section） with high-resolution in the upper reaches of Huaihe River. The chronological frame was got by correlating with the published loess time series. Magnetic susceptibility was measured on a mass of 10 g of ground sediment with a Bartington MS2-B Magnetic Susceptibility Meter. The grain size was determined using the Mastersiser-S laser analyzer with （NaPO3）G as dispersing agent after pretreatment with 10% HC1 and 10% H2O2 to remove secondary carbonates and organic material respectively. By comparison of the magnetic susceptibility and grain size of among YPC profile, XJN profile （western Loess Plateau） and the JYC profile （southern Loess Plateau）, we find that the variations of the pedogenesis environment in these three profiles are very similar, but the magnetic susceptibility of loess-soil profile sequences in the upper reaches of the Huaihe River was much lower than that in the Loess Plateau, and the grain size was much coarser than that in the Loess Plateau. The contrasting on grain size for these three profiles revealed that there were different dust sources, which belonged to different dust transporting aeolian systems. The loess in the upper reaches of the Huaihe River was a wind blown deposition of near source, while the coarser dust mainly came from loose alluvial deposits of alluvial and proluvial fans of the Yellow River. The yielding and carrying dynamics of the dust in the Huaihe River is the North-East wind prevailing in the winter half year.

关 键 词：风成黄土 风力系统 粉尘源区 淮河上游 

分 类 号：P532[天文地球—古生物学与地层学]