自晚第三纪以来本区主要受北东—北东东向挤压应力场控制。
The region under investigation was subjected to a strong NW-SE tension in Early Tertiary.
后者是由原有的南北向挤压应力场演变成南北向扭力场而形成的。
The latter were formed by theN-S striking shearing stress field evolved from the original compressive stress field.
应力场的分析表明，劈理构造由近南北向的地壳水平挤压应力作用形成。
The stress field analysis showed that the cleavages formed under horizontal, S-N trending compressive stress.
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