沉积钙质白云石带状面缺陷的择优取向

THE PREFERRED ORIENTATION OF RIBBON-LIKE PLANAR DEFECTS IN SEDIMENTARY CALCAREOUS DOLOMITE

作者用透射电子显微镜研究了沉积钙质白云石中的带状面缺陷。在衍衬象中面缺陷呈现出特有的条纹衬度,并具有一定的择优取向,它们沿着{018}面排列。面缺陷也可以分叉,分枝部分平行于{210}面。根据白云石面缺陷的取向,本文提出了鞍状白云石宏观弯曲面和微观面缺陷的取向关系。

Sedimentary calcareous dolomite from the Upper Sinian Dengying Formation in Nanjing, China, has been investigated by transmission electron microscopy. Most of the fringed planar defects are parallel predominantly to {018}. When the planar defects display branching, their short 'arms' should be parallel to {2(?)0}. According to the orientation of the planar defects, we first proposed that the orientation relationship should exist between micrographic planar defects and macrographic distortion faces in saddle dolomite.