- 责任者：Zhu Jingjing (State Key Laboratory of Ore Deposit Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Hu Ruizhong
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(9)
- 关键词：铜矿 ; copper ores ; I型花岗岩 ; I-type granite ; 云南 ; Yunnan Province
- 页码：p.2553-2566
- 图表：6 illus., 2 tables, 82 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
The Yangla copper deposit is located in the middle zone of Jinshajiang suture zone. The Beiwu, Linong and Lunong granitoids exhibit a linear distribution from north to south in the ore district.The three granitoids have similar compositions of major, trace elements and Sr-Nd isotopes, indicating that they have a common magma source. Moreover, considering the slightly negative Eu anomalies, it is suggested that the three granitoids belong to high-K calc-alkaline, metaluminous-slightly peraluminous I-type granites. By combining with comparative analyses of the tectonic settings, the authors propose a model in which the Beiwu, Linong and Lunong granitoids were generated under a late collisional or post-collisional setting. Decompression induced those mantle-derived magmas underplated and provided the heat for the anatexis of the crust. The hybrid melts (i.e., mantle-derived and the lower crustal magmas) and subsequent fractional crystallization could be responsible for the formation of the Beiwu, Linong and Lunong granitoids.