河南某地粘土矿中锂绿泥石的发现及初步研究

本文将粘土岩中含锂最高(Li_2O——1.76%)的16号样品分成八个粒级,采用X射线粉晶照相、X射线粉末衍射,红外吸收光谱、差热、化学全分析、透射和扫描电镜以及质子核磁共振和顺磁共振等手段,对其进行了较详细的研究。结果表明,样品主要由结晶较好的细粒锂绿泥石组成,含少量的伊利石。经计算得锂绿泥石的化学式为: (Li_(0.68) Ca_(0.01) Na_(0.01))_0.70 (Al_(3.85) Mg_(0.09) Fe_(0.05)~(2+) Fe_(0.01)~(3+))_4 (Si_(3.11)Al_(0.89)O_(10))(OH)_8利用X射线衍射强度估算,锂绿泥石在全岩中的含量约为85.1%,因而该样品可称做锂绿泥石粘土岩。根据锂绿泥石的共生组合和化学组成,结合显微镜下鉴定结果,推断本区锂绿泥石是伊利石在成岩作用中于较适宜的条件下转变来的。

DISCOVERY AND PRELIMINARY STUDY OF Li-CHLORITE IN CLAYSTONE FROM A CERTAIN LOCATION OF HENAN PROVINCE

Eight grain-sized fractions of sampie No.16 containing the highest content ofLi(Li_2O=1.76%)from claystone have been studied in more detail by X-ray powderphotography,X-ray powder diffraction analysis,IR absorption spectrometry,DTA,bulk chemical analysis,transmission and scanning electron microscophy,and prot-on nuclear magnetic resonance and paramagnetic resonance techniques.The samplestudied is composed mainly of rather perfect Li-chlorite crystals with a small am-ount of illite.The chemical formula has been calculated to be: (Li_(0.68) Ca_(0.01) Na_(0.01))_(0.70) (A1_(3.35) Mg_(0.09) Fe_(0.05)~(2+)_Fe_(0.01)~(3+))_4(Si_(3.11)Al_(0.39)O_(10)) (OH)_8. According to X-ray diffraction stength data,the content of Li-chlorite amou-nts to about 85.1% in the whole rock.Therefore,this sample can be referred toas Li-chlorite claystone. It can be deduced from its paragenesis and chemical composition,in conjunc-tion with microscopic data,that the Li-chlorite in this area was derived from illiteunder fa vourable conditions during diagenesis.