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滇西西盟一带是保山—掸邦地块在我国境内的一个基底岩系出露地区。该地区的前泥盆纪变质岩系可划分成两个构造层，下部为元古代构造层，由变质深度达角闪岩相的怕可杂岩系组成，发育３期南北向的变形构造；上部为早古生代构造层，由低绿片岩相变质的王雅组、允沟组组成，发育两期呈南北向的变形构造。变形构造表明，西盟变质岩系的主期构造格架以怕可—老街子背形叠瓦垛为主导构造要素，由背驮式扩展的向东逆冲的盲逆冲断裂系组成，王雅—允沟反冲叠瓦扇是盲逆冲断裂系的盖层响应变形系统，并以向西逆冲的推覆构造为特征
The western Yunnan province is a basaltic rock exposed area of Baoshan-Shan State in China. The former Devonian metamorphic rocks in the area can be divided into two structural layers, the lower part of which is a Proterozoic structural layer consisting of the Feke Complex series with amphibolite facies metamorphosed to a depth of 3 stages of NS deformation. The upper part of the Early Paleozoic tectonic layer, composed of low-greenschist facies metamorphic Wang Ya group, YunGou Formation, the development of two stages of the north-south deformation structure. The deformation structure shows that the main tectonic framework of the metamorphic rocks in the Ximeng Formation is dominated by the back-folding stacks of the Laojiezi, consisting of piggyback extended eastward thrusting bluff thrust faults, Wang Ying - Gound-hole recoil shoal is a caprock response deformation system of the blind thrust system and is characterized by nappe thrust to the westward thrust