| 滇西兰坪盆地构造体制和成矿背景分析 |
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| 引用本文：.2002.Analysis of Oreforming Background and Tectonic System of Lanping Basin, WEstern Yunnan Province[J].Mineral Deposits,21(1):36~44 |
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| 基金项目:国家重点基础研究发展规划项目r G1999043201)、中国博士后科学基金项目和国家计委地球科学专门项目(地科专98-011) |
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| 中文摘要: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司题。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胜质演变。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。推测兰坪盆地具有大规模有效沟通地幔的盆地动力学体制。 |
| 中文关键词:成矿背景 杓造体制 兰坪盆地 云南西部 |
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| Analysis of Oreforming Background and Tectonic System of Lanping Basin, WEstern Yunnan Province |
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| Abstract:The tectonic background oflarge-scale mineralization is an important problem to which ore geologists both at home and abroad have attached much importance . Viewing the tectonio-sedimentary- magmatio 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 E W- trending buried structures . The basin underwent rifting in Indff Chinese epoch , depression in anshanian 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 mag matis m , 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 dyna mic mechanis m of large-scale effective connection with the mantle . |
| keywords:ore-for ming background , tectonic syste m , Lanping basin , western Yunnan |
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