位于秦岭西段北侧天水市附近的李子园群系张维吉等建立，由遭受不同程度变质作用改造的新元古代至早古生代火山沉积岩系构成。对关子镇一带李子园群研究后，发现该群至少遭受了两期强烈变形。早期为伴生低绿片岩相变质作用的近东西向右行剪切，晚期为北西—南东向的左行剪切。通过对变质矿物黑云母的４０Ａｒ３９Ａｒ定年研究，确定早期变质变形事件发生在石炭纪初（３５５Ｍａ） Located in the north of Qinling Tianshui Tianshui City near the Department of Zhang Wei Ji et al. Set up by varying degrees of metamorphism of the Neoproterozoic to Early Paleozoic volcanic sedimentary rock formation. After studying the plum garden in Guanzizhen area, it was found that the group suffered at least two strong deformations. In the early stage, the near-to-right-west shears are associated with lower-greenschist facies metamorphism, and the late stage is the north-south-east left-hand shear. Through the 40Ar39Ar dating of the metamorphic minerals biotite, it was confirmed that the early metamorphic deformation occurred at the beginning of the Carboniferous (355 Ma)