Study on twilled structure-Superimposed deformation in the Shimanto Belt of the Ryukyu Islands-

斜纹构造是指以两个不同方向的断层为界的块体结构，每个块体的层理或片理的取向分别代表不同的方向，如斜纹布。该结构是在冲绳岛和tokasiki岛发现的。晚渐新世完成的NE-SW向褶皱和断裂体系与晚第四纪NW-SE向断裂叠加，形成褶皱构造。各块体均有穹窿和盆地构造，表现为叠加变形。以卡约组砂岩的石英增益作为应变标志，进行了三维应变分析。但结果并不令人满意，因为在应变场中没有显示叠加变形，而只显示了变形过程中的裂纹变形。

Twilled structure signifies a block structure bounded by faults of two different directions and the orientation of bedding or schistosity of each block represents different direction respectively such as twilled cloth. The structure is discovered in the Okinawa-jima and Tokasiki-jima.The fold and fault system of NE-SW direction had been accomplished in the late oligocene time has been superimposed by the faulting of NW-SE direction in the late quaternary producing the twilled structure. They have also dome and basin structure in each block suggesting a superimposed deformation.Three dimensional strain analysis have been carried out using quartz gains of the sandstones from the Kayo Formation as strain marker. The result is however, not satisfied because the superimposed deformation in the strain field is not revealed but a seak deformation during the soldification is only shown.