苏皖交界地区坡缕石的矿物学特征  

Mineralogy of Palygorskite from the Jiangsu-Anhui Border Area

作　　者：易发成[1] 李虎杰[1] 田煦[1] 郑自立[1] 

机构地区：[1]西南工学院非金属矿研究所

出　　处：《岩石矿物学杂志》1995年第3期262-270,共9页Acta Petrologica et Mineralogica

基　　金：国家建材局行业基金及西南工学院科研基金

摘　　要：本文对苏皖交界地区内沉积成因的坡缕石及全椒热液成因的坡缕石进行了物性、形貌、化学成分和晶体化学特征及结构特征的研究。研究表明，研究区内坡缕石的矿物学特征与美国凹凸堡的坡缕石一致，而有别于全椒热液型坡缕石。此外，对坡缕石的吸附性能也进行了讨论。Palygorskite occurs in clay sediments at the top of the Miocene Xiacaowan Forma- tion,Its crystals assume fibrous, acicular and rod forms,and the aggregates vary greatlyin shape. Its morphological and physical features are somewhat different from featuresof kydrothermal palygorskite from Quanjiao, Anhui Province.Palygorskite from the study area is in accord with palygorskite from Attapulgs,U.S.A. in chemical composition, both characterized by high TiO_2, Fe_2O_3, MgO, CaO,Na_2O and K_2O and low Al_2O_3 and SiO_2.Crystallochemically, it is of a dioctahedral-trio-tahedral transitional type rich in Fe￣(3+) and Mg￣(2+) and deficient in Al￣(3+). In contrast, hy-drothermal palygorskite from Quanjiao is noted for low Fe￣(3+) and Mg￣(2+) and high Al￣(3+).Palygorskite from the study area belongs to monoclinic system, with degree of crystal-lization lower than that of hydrothermal orthorhombic palygorskite from Quanjiao, Thesubstitution of Fe￣(3+) and Al￣(3+) for Mg￣(2+) might cause distortion in its crvstal lattice.The absorbability of palygorskite is related to such factors as its grain size,specificsurface area and acid active treatment.Acid treatment can enlarge the specific surfacearea and microporous volume of palygorskite, hence raising its absorbability.

关 键 词：坡缕石 矿物学 苏皖地区 粘土矿物 

分 类 号：P578.94[天文地球—矿物学]