- 责任者：Han Siyu (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Liu Jiajun
- 刊名：Geoscience
- 出版年：2013
- 卷期：27(6)
- 关键词：铜矿 ; copper ores ; 云南 ; Yunnan Province
- 页码：p.1283-1296
- 图表：11 illus., 6 tables, 30 refs.
- 分类号：1001
- issnNo：ISSN1000-8527
- isbnNo：CN11-2035/P
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.