楚雄弧后前陆盆地的形成及演化  

THE FORMATION AND EVOLUTION OF CHUXIONG BACK-ARC FORELAND BASIN

作　　者：陈根文 吴延之[2] 

机构地区：[1]西南有色地质研究所,昆明650216 [2]中南工业大学,长沙410083

出　　处：《云南地质》1999年第4期392-397,共6页Yunnan Geology

基　　金：国家计委"东川;楚雄地区铜矿成矿预测及靶区优选"(代号JG9471905)项目

摘　　要：楚雄盆地的性质属弧后前陆盆地。盆地剖面结构由四个带组成: (1) 岩浆弧; (2) 褶皱逆冲带; (3) 沉降带; (4) 隆起带。盆地的形成演化受两期主要应力控制: 早期受来自西南向的特提斯洋沿哀牢山带的俯冲影响, 形成凹陷盆地, 时代为晚二叠世至晚三叠世, 随后应力性质发生转变, 沿哀牢山一带的主应力以剪切—挤压为主, 并派生东西向的扩张运动, 形成断陷盆地。盆地演化经历了四个主要阶段: (1) 成盆前上隆阶段; (2) 凹陷阶段; (3) 断陷阶段; (4) 萎缩阶段。The Chuxiong basin is a back-arc foreland basin. And the basin section includes 4 zones, ie, (1)magmatic arc; (2)fold-thrust zone; (3)subsidence zone and (4)uplifted zone. The formation and evolution of this basin are controlled by the main stress in two periods. The earlier one was affected by the subduction along Ailao Mts zone from the southwest Tethys plate, and formed a subsidence basin from Late Permian to Late Triassic. After Jurassic, the main stress along Ailao Mts became shear-compressive, derived EW expansion and formed the fault-depression basin. The evolution of the Chuxiong basin has experienced 4 main stages, ie, (1)uplifted stage before basin formation; (2)subsidence stage; (3)fault-depression stage; (4)shrinking stage.

关 键 词：弧后前陆盆地 力学机制 盆地 形成 

分 类 号：P544.4[天文地球—构造地质学]