Two different illites in Luochuan loess, Northern Shaanxi Province  

作　　者：CHENLi ZHANGLifei WANGHejin ZHOULiping CHENJing YUANBaoyin 

机构地区：[1]KeyLaboratoryofOrogenicBeltandCrustalEvolution,MOE SchoolofEarthandSpaceSciences,PekingUniversity,Beijing100871,China//ElectronMicroscopyLaboratory,SchoolofPhysics,PekingUniversity,Beijing100871,China [2]KeyLaboratoryofOrogenicBeltandCrustalEvolution,MOE SchoolofEarthandSpaceSciences,PekingUniversity,Beijing100871,China [3]CollegeofEnvironmentalSciences,PekingUniversity,Beijing100871,China [4]ElectronMicroscopyLaboratory,SchoolofPhysics,PekingUniversity,Beijing100871,China [5]InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China

出　　处：《Chinese Science Bulletin》2005年第1期82-87,共6页

基　　金：the Youth Fund of Peking University;the Teaching and Research Award Program for Outstanding Young Teachers in the Higher Education Institutions of the Ministry of Education,China;the National Natural Science Foundation of China(Grant No.49925307); TEM Analysis Fund of Peking University.

摘　　要：Two different illites in samples from S0 to L10 loess-paleosol sequence at Heimugou section in Luochuan are identified by decomposition of X-ray diffraction (XRD) curve, transmission electronic microscopy (TEM) and energy dis- persive X-ray detector (EDX) analyses. Type I illite displays relatively poor crystallinity, wide and blunt XRD peaks, the highest content of which in <2 μm clay minerals is up to 55%. Type II illite shows good crystallinity, narrow and sharp XRD peaks. The contents of these two types of illites show mutually exclusive relationship in the studied section. The EDX analyses indicate that in contrast to the illite with good crystallinity, the illite with poor crystallinity is enriched in K+, Si4+ and depleted inAl3+.Two different illites in samples from S_0 to L_(10) loess-paleosol sequenceat Heimugon section In Lnoctaan are identified by decomposition of X-ray diffraction (XRD) curve,transmission electronic microscopy (TEM) and energy dispersive X-ray detector (EDX) analyses. Type Iillite displays relatively poor crystallinity, wide and blunt XRD peaks, the highest content ofwhich in <2 \ua clay minerals is up to 55 percent. Type II illite shows good crystallinity, narrowand sharp XEB peaks. The contents of these two types of illites show mutually exclusive relationshipin the studied section. The EDX analyses indicate that in contrast to the illite with goodcrystallinity, the illite with poor crystallinity is enriched in K^+, Si^(4+) and depleted inAl^(3+).

关 键 词：伊利石 黄土 陕西 能量分散X射线探测 X射线衍射分析 转换电子显微镜 粘土矿物 

分 类 号：P619.231[天文地球—矿床学]