The petrofabricdiagrams show the SEE and NEE orientational squeezing stresses, which suggest that theLu-an Coal District fractural structures underwent multiple complex deformation atleast twice.

• 岩组图反映了南东东向和北东东向的挤压作用，这意味着潞安矿区的断裂构造经受了两期以上的复合变形。