滇西地区板块-地体构造

Plate terrane Tectonics of the West Yunnan

滇西三江地区处于冈瓦纳（印度）和欧亚（扬子）两个超级大陆的汇聚带，由兰坪－思茅、保山、昌宁－孟连和腾冲等四个微板块拼贴而成，其间为金沙江、澜沧江、怒江和柯街－南汀河等主要汇聚带．各微板块内又可进一步划分出变质地体、裂谷、陆架裂陷、后碰撞裂陷、岛弧、蛇绿混杂岩带等１２个次级单元．该区古生代存在古特提斯，三叠纪存在中特提斯，但中生代的新特提斯仅存在于怒江汇聚带．古－中－新特提斯的开与合，控制了整个滇西地区的构造演化．

Tectonically,the west Yunnan in the Sanjiang area is situated at the conjunction belt between the super scale Gondwana (or Indian continent) and Eurasia (or Yunnan continent), and is composed of several converged and assembled microplates.Based on its tectonic features,it can be divided into four microplates (i e Lanping Simao,Baoshan,Changning Menliang and Tengchong) and four main convergent assemble belts(i e Jingshajiang Honghe,Lancangjiang,Nujiang and Keje Nandinghe).Furthermore,the former can be divided into 12 secondary tectonic units which include metamorphic terranes,rifes,continental shelf taphrogens,post collision taphrogens,island arcs,ophiolite melange belts etc.For the latter,the Lancangjiang belt is the most important convergent assemble one.Various data show that paleo Tethys in paleozoic,mid Tethys in Trassic existed extensively in the west Yunnan,but the new Tethys only appeared along Nujiang convergent belt.The tectonic evolution of Sanjiang area was controlled by the pleo ,mid and new Tethys spreading and assembling.