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作 者:韩思宇[1,2,3] 刘家军[1,2] 杨喜安[1,2] 陈思尧[1,2] 程文斌[4]
机构地区:[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [3]中国五矿集团公司,北京100010 [4]成都理工大学地球科学学院,四川成都610059
出 处:《现代地质》2013年第6期1283-1296,共14页Geoscience
基 金:国家重点基础研究发展计划项目(2009CB421003;2009CB421005);高等学校学科创新引智计划项目(B07011)
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δ34 S 值为11.5‰~17.8‰,矿石铅同位素比值为206 Pb /204 Pb =18.498~18.626,207 Pb /204 Pb =15.588~15.760,208 Pb /204 Pb =38.430~38.974。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。The Luchun massive sulfide deposit is located in the Luchun-Hongponiuchang rift basin.The Lu-chun 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 geo-chemical data on the minerals are similar to the volcanics.The result of sulfur isotopic analyses shows that the 34 S values vary from 11.5‰ to 17.8‰.Ore lead isotopic compositions are rather uniform,as evidenced by the Pb isotopic ratios:206 Pb /204 Pb =18.498 to 18.626;207 Pb /204 Pb =15.588 to 15.760;208 Pb /204 Pb =38.430 to 38.974.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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