摘要
天津蓟县中元古界串岭沟组上部黑色页岩产有丰富的伊利石,其矿物组合仅为石英和伊利石,是重要的可利用伊利石资源。运用化学成分分析和XRD方法确定出伊利石含量为6 4 %～70 %。由Scherrer方程计算的平均c* 轴方向厚度为12 nm,平均b轴方向长度为16 7nm,结合伊利石的片状生长习性,可确定串岭沟组上部黑色页岩所产伊利石为二维纳米级伊利石,具有重要的纳米属性。化学成分分析表明,黑色页岩所产伊利石具有0 .75的层间电荷和二八面体为主的二八—三八面体的过渡类型八面体结构特点。对数正态粒度大小的分布特征表明黑色页岩中的伊利石经历了由成核→等体积转移→最终长大的Ostwald成熟效应。
Illite is rich in black shale of the upper part of the Mesoproterozoic Chuanlinggou Formation in Jixian County, Tianjin City. The mineral assemblage in the black shale presents only quartz and illite and therefore this black shale is an important potential resource of illite. The abundance of illite in black shale was determined as 64%～70% by means of chemical composition analysis and X-ray diffractometry. The average thickness along the c* axis and the length along the b axis were calculated with the Scherrer equation as 12 nm and 167 nm respectively. Considering the flake-crystallization behavior, the illite found in the upper part of the Chuanlinggou Formation is two-dimensional nano-scale illite and possesses important nano-properties. It is shown from the chemical composition analysis that this kind of illite has an interlayer charge of 0.75 and is characterized by the transition from dioctahedral to trioctahedral with dioctahedral structure being dominant. The lognormal distribution of granularity shows that such illite underwent the Ostwald ripening from nucleation through isovolume transition to growing up.
出处
《地质论评》
CAS
CSCD
北大核心
2005年第3期319-324,共6页
Geological Review
基金
国家自然科学基金项目 (编号 40 2 72 0 2 2 )资助成果
