东北地区上古生界泥质岩石共存黏土矿物  

Research on Coexisting Clay Minerals in the Upper Paleozoic Argillaceous Rocks in Northeast China

作　　者：胡大千[1] 刘越[1] 洪艳[1] 解晓婷[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《吉林大学学报（地球科学版）》2011年第5期1458-1465,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家重点基础研究发展计划项目(2009CB219303);中国石油化工股份有限公司项目(GO800-06)

摘　　要：利用电子显微镜(JSM-6700F)配合能谱仪(INCA),进行了黏土矿物显微形貌和微区成分的研究。自生伊利石和绿泥石通常片径为1～3μm,边界平直;碎屑(次生或原生)伊利石和绿泥石一般片径>3μm,呈不规则的片状集合体形态。在化学成分上自生、碎屑伊利石和绿泥石基本一致。共存黏土矿物出现的几率和相对质量分数研究表明(XRD):研究区黏土矿物以伊利石(I)和绿泥石(C)为主,高岭石(K)和伊利石/蒙皂石混层(I/S)次之,绿泥石/蒙皂石混层(C/S)较少,蒙皂石(S)极少。伊利石结晶度(IC)和黏土矿物的相对质量分数的相关分析反映,IC与I/S、K、I、I/S、C、C/S、C/S和S的相关系数分别为0.611、0.262、-0.447、-0.290、-0.265、-0.190、-0.160和-0.117。采用因子分析研究了黏土矿物参数的空间展布特征:F1因子主要为IC、I/S+C/S和I+C的相对含量;F2因子主要为IC、伊利石(白云母)多型和伊利石(白云母)b0值;F3因子为I/S和C/S比值;F4因子为S+K。采用全回归分析方法,建立了IC与S、I/S、I、K、C和C/S相对质量分数的相互关系。Using the scaning electronic microscope（JSM-6700F） and energy spectrum（INCA）,the micromorphology and microcompositon of clay minerals were analyzed.The authigene illite and chlorite platy crystals are generally straight and 1-3 μm in diameter.Clastic（secondary or primary） illite and chlorite are generally3 μm in diameter and irregular platy cluster.In chemical composition,both the authigene and clastic illite or chlorite are almost the same.Research on the probability of occurrence of coexisting clay minerals and their relative contents（XRD） suggests that the clay minerals in the studied area are mainly illite（I）,chlorite（C）,kaolinte（K） and illite/smectite（I/S） mixtures.The chlorite/smectite（C/S） and smectite（S） are rare.The correlation analysis of the crystallinity of illite（IC） and the relative content of clay minerals suggests that correlation coefficients of IC with I/S,K,I,I/S,C,C/S,C/S and S are 0.611,0.262,-0.447,-0.290,-0.265,-0.190,-0.160 and-0.117 respectively.Factor analysis is also used to study the spatial distribution of the clay minerals.F1 factors are mainly contributed by IC,relative contents of I/S＋C/S and the relative content of I＋C.F2 factors are attributed mainly to IC,polymorphism of illite（muscovite）,b0 dimension of illite（muscovite）;F3 factors are ratios of I/S and C/S;F4 factor contributes with S＋K.Using the retrogressive analysis,the relationship between the IC and S,I/S,I,K,C and C/S has been set up.

关 键 词：泥质岩石 黏土矿物 统计分析 极低级变质作用 上古生界 东北地区 

分 类 号：P575[天文地球—矿物学]