伊利石结晶度指数在岩石变质程度研究中的应用

利用X射线衍射仪可以测量粘土矿物中伊利石结晶程度。引入国际通行的半峰宽法(KI指数法)，对海拉尔盆地贝尔凹陷布达特群和松辽盆地北部石炭一二叠系的样品进行了分析。通过对其结晶度指标的研究，发现在海拉尔盆地布达特群和松辽盆地北部石炭-二叠系的岩石中存在不同级别的变质作用。使用伊利石结晶度指数法可以将极低级变质与未变质的岩石类型区分开，也可以将极低级变质与浅变质的岩石类型区分开，从而解决了沉积岩与浅变质岩之间过渡岩石类型划分的难题。

Application of the cryatalization index of lllite in the study on rock metamorphose degree

XRD is used to measure the crystalizaiton index of the illite in the clay mineral. This paper introduces the half peak width method(KI index) which is widely used in the world to analyze the Permo-carboniferous sample from Budate Group in Geier Sag in Hailaer Basin and northern Songliao Basin. The study on the crystallization index shows that different degree of metamorphose exist in the rock.Using KI index method can distinguish the extremely lowly metamorphose rock from non-metamorphose rock,and can distinguish the extremely lowly metamorphic rock from shallow metamorphic rock,and therefore solve the problem of the classification of the transitional rock between sedimentary rock and shallow metamorphic rock.