对磁组构在岩石变形分析应用中若干问题的思考

DISCUSSION ABOUT APPLICATION OF ANISOTROPY OF SUSCEPTIBILITY IN STRUCTURAL DEFORMATION OF ROCKS

在应用传统的磁组构方法进行岩石构造变形分析时,发现这些方法中有许多不完善之处,如变形岩石磁化率量值椭球和应变椭球是否可以对应及对应条件,初始磁组构是否会影响变形岩石磁化率量值椭球与应变椭球的对应关系,岩石脆性破裂前的塑性变形是否影响磁组构,韧性变形如何影响磁组构,能否用磁组构来推断主应力方向,Rathore（1980）最小磁化率指向对韧性剪切带运动方向和方式的分析在多期变形区是否适用等,并据此提出解决这些问题的实验方法。

Anisotropy of magnetic susceptibility (AMS) has been widely used in analyzing structural deformation of rocks. Some experiments were made to identify whether AMS ellipsoid corresponds to the strain ellipsoid, whether the initial AMS can influence AMS of the deformed rocks, and whether plastic deformation before the brittle fracture of rocks can influence AMS of rocks. The experimental results show that misuse of AMS is very common. So.it needs a further research on how to use AMS to analyzing structural deformation of rocks.