天然变形微斜长石中几种面缺陷的透射电镜初步观察

本文利用超高压透射电子显微镜对在相当于角闪岩相条件下天然变形的微斜长石进行了初步研究。研究发现,光学显微镜下看到的一组平行细纹不是出浴条纹,而是变形条带。另一种超显微构造——滑动小叶片见于变形条带邻区,它们和另一相矿物出港或沉淀形成的小叶片不同,是由矿物的变形造成的。变形条带、滑动小叶片以及比较常见的堆垛层错都相互平行,看来都是由分位错沿同一类型的滑移面运动形成的。

A PRIMARY TEM INVESTIGATION ON SOME PLANE DEFECTS IN NATURALLY DEFORMED MICROCLINE

Microcline naturally deformed under amphibolite facies temperature andpressure conditions has been investigated using ultra-high voltage TEM. It isrevealed that a set of lamellae which can be seen under the microscope arenot ensolution lamellae, but deformotion ones. These lamellae lie near theplane (100). Another ultra-fine structure-glide platelet is observable nearthe deformation lamellae which differ from the platelets derived from theexsolution or precipitation of another mineral. It may be due to the deforma-tion of the mineral. All deformation lamellae, glide platelets and commonstack faults parallel to each other seem to have been formed as a resultof the movement of partial dislocation along the same glide plane.