| 陆缘裂谷盆地的形成演化与VMS矿床形成特征和成因类型的关系：以云南鲁春铜矿为例 |
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| 引用本文： | 韩思宇,刘家军,杨喜安,陈思尧,程文斌.陆缘裂谷盆地的形成演化与VMS矿床形成特征和成因类型的关系：以云南鲁春铜矿为例[J].现代地质,2013,27(6):1283. |
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| 作者姓名： | 韩思宇 刘家军 杨喜安 陈思尧 程文斌 |
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| 作者单位： | 中国地质大学(北京) 地球科学与资源学院, 北京100083 |
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| 摘 要： | 云南鲁春铜矿位于“三江”地区金沙江造山带内的鲁春—红坡牛场裂谷盆地。研究发现，鲁春铜矿赋存于一套以长英质为主的双峰式火山岩中，矿体分布呈“上层下脉”状，具有“上黄下黑”的金属分带特征，矿石矿物以方铅矿、闪锌矿和黄铜矿为主。而地球化学特征显示矿石与蚀变围岩及矿区火山岩的微量元素配分特征具有良好的相似性。矿石硫化物的δ34S值为115‰~178‰，矿石铅同位素比值为206Pb/204Pb=18498~18626，207Pb/204Pb=15588~15760， 208Pb/204Pb=38430~38974。阐述了鲁春—红坡牛场裂谷盆地的演化历史以及盆地内大量双峰式火山岩具有洋脊或板内拉张的特征，陆缘火山弧中重新拉张塌陷形成裂谷盆地，造成基底玄武岩浆上侵，从而导致大规模双峰式火山岩的喷发，这一系列特殊的构造背景和成矿环境促进了地壳内热液循环系统的形成，含矿热液的上升喷流和矿质沉淀集积，最终导致矿床形成。
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| 关 键 词： | 盆地演化 地质特征 地球化学特征 鲁春铜矿 云南 |
he Evolution of the Continental Margin Rift Basin and Its Relationship to VMS Deposit: A Case Study of the Luchun Copper Deposit,Yunnan Province |
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| HAN Si yu,LIU Jia jun,YANG Xi an,CHEN Si yao,CHENG Wen bin.he Evolution of the Continental Margin Rift Basin and Its Relationship to VMS Deposit: A Case Study of the Luchun Copper Deposit,Yunnan Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2013,27(6):1283. |
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| Authors: | HAN Si yu LIU Jia jun YANG Xi an CHEN Si yao CHENG Wen bin |
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| Institution: | School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China |
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| Abstract: | The Luchun massive sulfide deposit is located in the Luchun Hongponiuchang rift basin. The Luchun copper deposit occurs in a series of bimodal volcanic rocks which are dominated by acidic volcanics. There are upper and lower orebodies in the ore district: the upper is black and lower is yellow. The assemblage of minerals, with higher contents of sphalerite, galena and chalcopyrite, is simple. Trace elements and REEs geochemical data on the minerals are similar to the volcanics. The result of sulfur isotopic analyses shows that the 34S values vary from 115‰ to 178‰. Ore lead isotopic compositions are rather uniform, as evidenced by the Pb isotopic ratios: 206Pb/204Pb=18498 to 18626；207Pb/204Pb=15588 to 15760；208Pb/204Pb=38430 to 38974. It is clear that the evolution history of the rift basin. And the bimodal volcanics in the basin are typical of oceanic ridges or intraplate extensional settings and island arc, it suggests that the tectonic setting in this area is extensional and rifting. The deposit was associated with the bimodal volcanic rocks in the extensional setting, which was favoured to the formation of the hydrothermal fluids circulatory system. The hydrothermal fluids exhaled and precipitated to form the Luchun VMS deposit. |
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| Keywords: | basin evolution geological characteristic geochemical characteristic Luchun copper deposit Yunnan |
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