云南宁蒗地区菱形构造格局及其联合构造型式

RHOMBOHEDRAL STRUCTURE FRAMWORK AND ITS JUNCTION STRUCTURE STYLE IN NINGLANG AREA OF YUNNAN

宁哀地区位于杨子准地台西缘；区域上属南北向川西一藏东构造带，其东为南北向康滇地轴，西为近南北向三江构造带。区域重磁资料反映了基底和盖层由北东向、北西向断裂系组成的区域菱形构造格局，宁蓑地区基本菱形构造格局实属其有机组成部分。因各菱形构造的边界条件及应力状态不同，在研究区内形成了各型联合构造。宁蒗东南区发育宁南菱形构造及其所决定的宁南反凸双弧联合构造。宁南反凸双弧联合构造东弧带追踪基底南北向构造所形成的包都——波罗弧形断裂．是本区重要的喜山期主于控岩控矿构造。

Ninglangarea lies in the west edge of Yangtze Platform,and belongs to western Chuan-eastern Zang regional structure belts.There are north-southern Kangdian earth's axis in the east and nearly north-southern Sanjiang fold- system in the west.Regional gravimetric- magnetic anomaly shows regional rhombohedral structure framework being made from northeastern and northwestern fault-system on basement and cover.Ninglang ess,ential rhombohedral structure framwork is a part of regional one。Because of different boundary condition and stress state of ev-ery rhombohedral structure,all kind of bogen junction structure are formed in Ninglang area. The southeastern Ninglang area develops Ningnan rhombohedral structure and its Ningnan double-bo-gen junction structure. In Ninglang area,the most important structure controlling Himalayan por-phyry body and ore body is Baod Boluo fault formed from Ningnan bogen junction structure tracking north-southern structure on basement。