摘要
独石口沸石岩共生矿物组合为斜发沸石、蒙脱石、α-方石英和少量丝光沸石。斜发沸石呈微晶产于玻璃质岩屑和火山尘中,也呈板状产于玻屑和珍珠岩溶解形成的孔洞中,沸石总量大于70%;化学成分显示高Si、高Al、富K、富Ca、贫Na的特征;阳离子交换容量高,交换性阳离子以Ca为主,其次为K,Na,Mg;阳离子选择交换顺序为NH_4^+>K^+>Ca^(2+)>Na^+>Mg^(2+);不同阳离子类型的沸石岩其热稳定性和吸附性有差异,K型和Na型沸石岩可稳定至700℃,而Ca型沸石岩在500℃时结构被破坏;Ca型沸石岩吸附性好,而K型差。
The zeolitic rocks altered by acidic pyroclastic rock of the third section of Upper Jurassic
Zhangjiakou Formation at Dushikou. Its mineral assemblages are clinoptilolite, smectite. crysto-
balite and minor mordenite. of which the content of zeolite is more than 70 percent. Zeolitic
rocks are characterized by high Si. high Al.K-rich. Ca-rich. Na-poor composition. The cation
exchange capacities (CEC) are high. exchangeable ions are primarily Ca. secondly K. Na, Mg.
The selective cation exchange is reduced in order of NH4+>K+ >Ca2+>Na+>Mg2+. The heat
stabilities and absorptions of various cation types are different, K-type and Na-type are sta-
blized up to 700°C. Ca-type is destroyed at 500°C.Ca-type zeolitic rock has the highest absorp-
tion capacity and the K-type the lowest.
出处
《现代地质》
CAS
CSCD
1993年第3期317-325,共9页
Geoscience
关键词
沸石岩
矿物组合
离子交换性能
zeolitic rock, mineral assemblage. ion exchange capacity, absorption capacity