2八面体型スメクタイトの水熱変化
1990 年 19 巻 Special 号 p. 107-111
詳細
1990 年 19 巻 Special 号 p. 107-111
Three montmorillonites from Tsukinuno, Odo, Mikawa and one beidellite from Sano saturated with various cations (Li, Na, Rb, Cs, Mg, Ca, Sr, Ba, Ni, Co) were treated under hydrothermal conditions. Smectites changed to mica, chlorite and some non-sheet silicates through interstratified mineral phases. Three kinds of interstratified minerals were formed under the existence of cations as follows :1) rectorite : Na, Ca, Sr, Ba, (Li, Mg).2) tosudite : Li, Mg, Ni, Co.3) mica/smectite (random) : K, Rb, Cs. The formation temperature of interstratified minerals from beidelldte is lower than that from montmorillonite. The conversion temperature of interstratified minerals from momtmorillonite are different in each sample. Moreover, the Al-rich samples were more reactive and changed to interstratified mineral phases at lower temperature than the Al-poor ones. Thus, phases of interstratified minerals (particularly regular ones) are probably formed hydrothermally througf beidellitic compositions.
