滇西兰坪盆地构造体制和成矿背景分析  

Analysis of Ore-forming Background and Tectonic System of Lanping Basin, Western Yunnan Province

作　　者：薛春纪[1] 陈毓川[2] 杨建民[3] 王登红[3] 杨伟光 杨清标 

机构地区：[1]长安大学成矿作用及其动力学开放研究实验室,陕西西安710054 [2]中国地质科学院,北京100037 [3]中国地质科学院矿产资源研究所,北京100037 [4]云南地质三大队,云南大理671000

出　　处：《矿床地质》2002年第1期36-44,共9页Mineral Deposits

基　　金：国家重点基础研究发展规划项目 (G19990 432 0 1);中国博士后科学基金项目;国家计委地球科学专门项目 (地科专 98_0 1)的联合资助

摘　　要：大规模成矿作用的地质构造背景是国内外矿床学界普遍关注的重大问题。文章从盆地整体着眼 ,从盆地构造_沉积_岩浆_变质作用过程着手 ,通过盆地内地质、地球物理和遥感等事实分析了滇西兰坪盆地的构造体制和成矿背景。兰坪盆地在古特提斯构造基础上发展起来 ,近南北向盆缘超岩石圈断裂和盆中央穿壳断裂及近东西向隐伏构造共同控制了盆地的动力过程 ,中_新生代经历了印支期裂谷、燕山期拗陷及喜马拉雅期走滑拉分的性质演变。受印度板块与欧亚板块碰撞制约 ,板内构造体制下的深大断裂和岩浆活动、幔流上涌、地层中不整合及壳幔相互作用等所体现的大陆地壳强烈运动是兰坪盆地的成矿基本地质背景。The tectonic background of large-scale mineralization is an important problem to which ore geologists both at home and abroad have attached much importance. Viewing the tectonic-sedimentary-magmatic-metamorphic process of the basin as a whole, this paper analyses the ore-forming dynamic background of the Lanping basin based on its geological, geophysical and remote-sensing data. The Lanping basin was developed on the basis of old Tethys. The dynamic process of the basin was jointly controlled by nearly NS-trending ultra-lithosphere faults along the basin margin and penetrating-crust faults within the basin and nearly EW-trending buried structures. The basin underwent rifting in Indo-Chinese epoch, depression in Yanshanian epoch and strike-slip extension in Himalayan epoch. The Lanping basin was affected by the collision of the Indo-plate with the Eurasian plate. The ore-forming background of the Lanping basin is basically the intense continental crust movement as evidenced by the large-scale deep faulting and magmatism, the mantle fluid upwelling, the unconformity in the strata and the mantle-crust interaction within a plate tectonics. The basin is inferred to possess a dynamic mechanism of large-scale effective connection with the mantle.

关 键 词：成矿背景 构造体制 兰坪盆地 云南 铅锌矿床 成矿作用 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]