豫南黄土粒度和常量元素地球化学特征及其对物源的指示意义  

Characteristics of Grain Size,Element Geochemistry and Their Provenance Implications of Loess in the South of Henan

作　　者：曹宏伟 郑祥民[1] 周立旻[1] 任少芳[1] 玄晓娜 吴超[1] 刘力 Cao Hongwei;Zheng Xiangmin;Zhou Limin;Ren Shaofang;Xuan Xiaona;Wu Chao;Liu Li(Key Laboratory of Geo-information Science of Ministry of Education,School of Geographic Sciences,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学地理科学学院地理信息科学教育部重点实验室,上海200241

出　　处：《地质科技情报》2018年第6期37-45,共9页Geological Science and Technology Information

基　　金：国家自然科学基金项目(J1310028;41371032)

摘　　要：选取豫南驻马店地区埋藏黄土样品进行了粒度、常量元素化学测试分析,探讨了其成因与物源。结果表明:驻马店黄土的粒级组分以粉砂为主,分选较差,峰态中等。粒径频率曲线以双峰为主,而且主峰突出;常量元素分析显示,驻马店黄土来源广泛并且经过了充分混合,化学风化作用处于中等风化阶段;沉积环境判别显示,驻马店黄土大部分为典型的风成成因,但部分层位可能受到古洪水带来的河流相物质的影响;结合黄土粒度与豫东地区风场模拟分析发现,驻马店与黄土高原黄土物源有所差异,驻马店黄土中的粗颗粒是近源风尘沉积物,主要来源于黄河下游泛滥造成的风沙带,受控于冬季豫东地区近地面盛行的东北风。豫南黄土是中国黄土的重要组成部分,深入了解该套沉积物的成因与物源对于研究该地区古环境具有重要意义。The grain sizes and major element chemistry of buried loess samples in Zhumdian,southern Henan Province were measured and analyzed,and the origin and provenance of the samples were discussed.The results show that the grain size fractions of the loess in this area are mainly silty sand,with poor sorting and medium kurtosis.Size frequency curves present the distribution of twin peak,with one prominent peak.The major element analysis shows that the loess has a wide range of sources and has undergone a full mixing,and its chemical weathering is in a moderate weathering stage.Identification of the sedimentary environment indicates that Zhumadian loess belongs to the typical eolian-formation debris, though some may have been influenced by the ancient flood which have brought in fluvial materials.Combination of wind power system in eastern region of Henan and the grain size analysis of Zhumadian loess reveals that it's different from the Loess Plateau,the local materials are mainly derived from the sand belt caused by the Yellow River flood which serves as a major contributor to coarse grain in the loess,and that the sand belt is under the control of prevailing northeast wind near the ground in the winter for half year in eastern Henan.Loess in the south of Henan is an important part of Chinese loess.Understanding the origin and provenance of sediments in this area is necessary to study the paleoenvironment of south of Henan.

关 键 词：驻马店黄土 粒度 常量元素 物源 

分 类 号：P595[天文地球—地球化学]