CAJ | 학술논문

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。
운남로춘동광위우“삼강”지구금사강조산대내적로춘-홍파우장렬곡분지。연구발현，로춘동광부존우일투이장영질위주적쌍봉식화산암중，광체분포정“상층하맥”상，구유“상황하흑”적금속분대특정，광석광물이방연광、섬자광화황동광위주。이지구화학특정현시광석여식변위암급광구화산암적미량원소배분특정구유량호적상사성。광석류화물적δ34 S 치위11.5‰～17.8‰，광석연동위소비치위206 Pb /204 Pb ＝18.498～18.626，207 Pb /204 Pb ＝15.588～15.760，208 Pb /204 Pb ＝38.430～38.974。천술료로춘-홍파우장렬곡분지적연화역사이급분지내대량쌍봉식화산암구유양척혹판내랍장적특정，륙연화산호중중신랍장탑함형성렬곡분지，조성기저현무암장상침，종이도치대규모쌍봉식화산암적분발，저일계렬특수적구조배경화성광배경촉진료지각내열액순배계통적형성，함광열액적상승분류화광질침정집적，최종도치광상형성。
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.