variant field meaning in Chinese

变体场

According to the analysis of the structure deformation variant direction the structure superposition during late period , and the tectonic stress field and deformation variant field , the cover extended nearly sn direction in early stage ( d - c ) , maybe changed the direction in pernian ( especial the late permian ) , and developed some new half - graben along sn direction except the succession activity at great fault zone . the direction of compression deformation variant , however , was nearly sn direction in indo - chinese epoch , ne - sw direction in early yanshan movement epoch , nne - ssw direction in late yanshan movement epoch , and transformed from ew to sn direction in himalayan movement epoch
根据不同构造层中变形方向及后期构造叠加的分析，对本区的构造应力场及变形场进行了探讨，本区盖层早期阶段( d - c )为近南北向的伸展拉张，二叠纪(特别是晚二叠世)的伸展方向可能发生了改变，除在各断裂带继承性活动外，沿南北方向又新生了一些半地堑。而在挤压变形时，印支期主要为近南北向挤压，燕山早期为nw - se向挤压，燕山晚期为nne - ssw向挤压，而喜山运动可能经历了从ew向向sn向方向挤压的转变。