The role of crustal contamination in the formation of the Jinchuan Ni-Cu-(PGE) sulfide deposit, northwest China

摘要：

The Jinchuan Ni-Cu-(PGE) sulphide deposit, NW China, is hosted in a relatively small ultramafic dike-like intrusion. The Jinchuan intrusion is dominantly composed of lherzolite and dunite. Half of the intrusion is sulfide-mineralized.The sulfide orebodies are mainly hosted in the dunite. Silicate rocks in the Jinchuan intrusion have high MgO contents, but low CaO and Al2O3contents. They are rich in LREE relatively to HREE and have a large range of PGE contents (e.g. 0.6-196 ppb Pt and 1.2-135 ppb Pd). High Th/Ta ratios(2.5 and 6.5) and high Th/Nb ratios (0.15 and 0.5)suggest that the magmas experienced assimilationfractional crystallization (AFC) process before they intruded the Jinchuan chamber. The AFC process played an important role for S-saturation.

关键词： Jinchuan Ni-Cu-(PGE) sulfide deposit crystal mush crustal contamination assimilation fractional crystallization (AFC) process

作者: Xieyan Song Meifu Zhou Liang Qi Yan Wang Chengjiang Zhang

作者单位: Key Lab.of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang Department of Earth Sciences, University of Hongkong, Hongkong, China College of Applied Nuclear Technology and Automation, Chengdu University of Technology, Chengdu 6100

会议类型: 国际会议

会议名称: 第八届国际矿床地质会议(Proceedings of the Eighth Biennial SGA Meeting)

会议地点: 北京

会议语种:英文

页码: 84-87

在线出版日期: 2005-08-18（万方平台首次上网日期，不代表论文的发表时间）