Abstract : this paper , by analyzing the effect of differences of mineral structure of 2 1 layer minerals , the properties of their interlayer charge and changes of some properties caused by weathering on the attractive force for interlayer cation , reached the conclusion that : the fixation capacity is determined by the ratio of the total amount of interlayer charge and that of tetrahedral charges . the relationship of interlayer cation fixation and octahedral structure of secondary minerals is probably different from that of primary minerals . the oxidation and reduction of variable valence cations can greatly influence the cation fixation capacity 文摘:分析2 1型礦物的結(jié)構(gòu)差異、層間電荷性質(zhì)以及在風(fēng)化過(guò)程中某些性質(zhì)的變化對(duì)層間陽(yáng)離子吸引力的影響,對(duì)已有報(bào)道中一些矛盾的結(jié)果或不具普遍意義的結(jié)論進(jìn)行了討論.得出幾個(gè)較為明確的結(jié)論:層間總電荷與四面體電荷所占比例大小共同決定礦物對(duì)層間陽(yáng)離子的固定能力;原生礦物中八面體結(jié)構(gòu)與層間陽(yáng)離子固定間的關(guān)系對(duì)次生礦物而言,也許并不一致;八面體中可變價(jià)陽(yáng)離子的氧化還原,可導(dǎo)致礦物固定陽(yáng)離子能力發(fā)生較大變化