胶南地区的胶南—诸城一带存在两期不同方向的伸展构造。早期以形成近ＥＮ向的拉伸线理为特征，并在不同构造层次上显示出不同的变形。出露于研究区中部桃林尚庄隆起的含榴辉岩片麻岩中，主要以ＬＳ的组构为特征，显示出早期伸展作用下地壳岩石的垂直轴缩短、ＥＷ向拉伸的共轴应变；而在把下地壳含榴辉岩片麻岩与以变沉积岩为主的中上地壳岩石分开的韧性滑脱带上，此期伸展作用则表现为从东向西剪切的非共轴简单剪切变形，具有近水平的拉伸线理及近水平的ＥＷ向剪切褶皱和鞘褶皱枢纽。晚期伸展作用表现为近ＳＮ的伸展垮塌作用，形成向北和向南倾斜的两条韧性正剪切带，且遭受低角闪岩高绿片岩相条件下的透入性均匀简单剪切变形，剪切方向分别向北和向南 Jiaonan area Jiaonan - Zhucheng area there are two different directions of the extension structure. Early to form near E  N-oriented stretching line is characterized by physical and structural differences in the different shows. Exposed to the eclogite-bearing eclogite from the Taolin-Shangzhuang uplift in the middle part of the study area, it is characterized mainly by the LS structure, indicating that the vertical axis of the crustal rocks is shortened and E-W-directionally stretched Coaxial strain; and in the lower crust eclogite gneiss and variable metamorphic sedimentary rocks in the upper and middle crust ductile zone of ductile detachment, the expansion of this period is shown from the east to west shear non-coaxial Simple shear deformation, with near-horizontal tension line and the near horizontal E W shear fold and sheath fold hinge. The late extensional effect appears to be an extensional collapse near SN, forming two ductile positive shear zones inclined northward and southward, and they are uniformly and simply penetrated under low-amphibolite  high-greenschist facies Cut deformation, shear direction, respectively, north and south