Genesis of the Permian Baimazhai magmatic Ni-Cu-(PGE) sulfide deposit, Yunnan, SW-China
Many small, mineralized mafic-ultramafic intrusions in China have large proportions of sulfides relative to the volume of silicate rocks. For example, over 43 vol.％ of the Jinchuan intrusion in NW China and over 90 vol.％ of the No.7 intrusion in Hongqiling in NE China are mineralized with disseminated or massive Ni-Cu-(PGE) sulfides (Tang, 1993). Like the Jinchuan and Hongqiling intrusions, the Permian Baimazhai intrusion in the Jinping region, SW China, is also mineralized in a large proposition (70 vol.％). The Baimazhai intrusion is a concentric body with a centrally disposed massive sulfide ore body surrounded by variably mineralized orthopyroxenite, websterite and barren gabbro (Fig. 1). The proportion of gabbro, websterite, orthopyroxenite and massive ore is approximately 30, 30, 20 and 20 vol.％, respectively (Wang et al., 2006). The Ni grades of ores range from 0.17 to 4.5 wt.％ with an average grade of 1.03 wt.％ and Cu grades from 0.12 to 2.3 wt.％ with an average of 0.81 wt.％. The estimated reserve of Ni metal is 50000 tonnes, with Ni from the massive ores making up 60％ of the reserve, according to an exploration project by a local geological team in the 1960s.
Christina Yan Wang Zhou Meifu
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 10640, China Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
国际会议
Xian International Ni-Cu(Pt) Deposit Symposium 2009(2009 西安·Ni-Cu(Pt)岩浆矿床国际学术研讨会)
西安
英文
123-126
2009-09-01（万方平台首次上网日期，不代表论文的发表时间）