兰坪-思茅中生代盆地性质及构造演化

兰坪－思茅盆地位于澜沧江缝合线与金沙江缝合线之间，它是在澜沧江洋和金沙江洋消亡后发展起来的一个中新生代陆内盆地。在中生代，该盆地的形成与演化受特提斯构造带的控制。对盆地地层格架和区内碎屑岩的骨架矿物成分、化学成分、微量元素以及火山岩化学成分的分析表明，兰坪－思茅中生代盆地是由两个不同类型的盆地叠置而成的多旋回叠合盆地，其早期为一后造山裂谷盆地，晚期为坳陷盆地。兰坪－思茅中生代盆地的形成和演化可反馈滇西特提斯构造演化的信息。

THE TECTONIC NATURE AND EVOLUTION OF MESOZOIC LANPING SIMAO BASIN

The Lanpin Simao basin lies between the Lancangjiang and Jinshajiang suture zones. With disappearance of the Lancangjiang ocean and Jinshajiang ocean, Lanping Simao region developed into a Mesozoic Cenozoic intracontinental basin. In Mesozoic era, the formation and evolution of the Mesozoic Lanping Simao basin were controlled by the Tethys tectonic zone. Based on the analysis of the stratigraphic framework, framework mineral composition, chemical composition, minor elements of clastic rock and composition of volcanic rock in this basin, the authers regard the Mesozoic Lanping Simao sedimentary basin as a polycyclic superposed basin which was fomed by stacking two different type basins. Firstly, it was a back orogenic rift basin. Lastly, it became a down warping basin. The formation and evolution of this Mesozoic basin may feedback the information about the evolution of the Tethys tectonic zone in Western Yunnan.