Paleomagnetic dating of the topmost terrace in Kouma,Henan and its indication to the Yellow River's running through Sanmen Gorges  

作　　者：PANBaotian WANGJunping GAOHongshan GUANQingyu WANGYong SUHuai LIBingyuan LIJijun 

机构地区：[1]KeyLaboratoryofWesternChina'sEnvironmentalSystems,MinistryofEducation,andDepartmentofGeography,LanzhouUniversity,Lanzhou730000,China [2]InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences(CAS),Beijing100101,China [3]KeyLaboratoryofWesternChina'sEnvironmentalSystems,MinistryofEducation,andDepartmentofGeography,LanzhouUniversity,Lanzhou730000,China

出　　处：《Chinese Science Bulletin》2005年第7期657-664,共8页

基　　金：supported by the National Key Foundation Research Project(Grant No.G1998040815);the National Natura1 Science Foundation of China(Grant No.40171010);the Key Project of Ministry of Education and the Teaching and Research Award Program for Outstanding Young Teachers

摘　　要：In the east of Xiaolangdi, many river terraces are developed at the exit of the Yellow River Gorges. Among them the terraces in Kouma, Yanshi of Henan Province are most typical, where the Yellow River developed three stair- case terraces, among which the altitude of gravel stratum of the topmost terrace is 30?35 m higher than the river level. The top of the gravel stratum was covered by 60 m eolian loess deposits which have many brownish-red paleosol strips. And the paleosol S14 is at its bottom. Research on systematic magnetostratigraphy and paleosol-loess matching indicates that the bottom age of the loess on the topmost terrace is 1165 ka. Therefore, it can be concluded that the terrace de- velops no later than 1.165 Ma and the situation that the Yel- low River runs through Sanmen Gorges and inpours into East China Sea happened at least before 1.165 Ma.In the east of Xiaolangdi, many river terraces are developed at the exit ofthe Yellow River Gorges. Among them the terraces in Kouma, Yanshi of Henan Province are mosttypical, where the Yellow River developed three staircase terraces, among which the altitude ofgravel stratum of the topmost terrace is 30-35 m higher than the river level. The top of the gravelstratum was covered by 60 m eolian loess deposits which have many brownish-red paleosol strips. Andthe paleosol S_(14) is at its bottom. Research on systematic magnetostratigraphy and paleosol-loessmatching indicates that the bottom age of the loess on the topmost terrace is 1165 ka. Therefore, itcan be concluded that the terrace develops no later than 1.165 Ma and the situation that the YellowRiver runs through Sanmen Gorges and inpours into East China Sea happened at least before 1.165 Ma.

关 键 词：河南 三门峡 黄河 发源地 地球科学 地磁学 

分 类 号：P942.77[天文地球—自然地理学] P318