Geochemistry, mineralogy and mineral chemistry of the Welatam Cu-Mo-Bi-Au prospect, Northeast Myanmar

doi:10.1016/j.oregeorev.2019.102973

	Geochemistry, mineralogy and mineral chemistry of the Welatam Cu-Mo-Bi-Au prospect, Northeast Myanmar
	Wang, Changhong; Huang, Yongjian; Ma, Yu; Zhang, Zhifeng
刊名	ORE GEOLOGY REVIEWS
	2019-08-01
卷号	111
关键词	Bismuth minerals Fluid-rock interaction Liquid bismuth in gold enrichment Molybdenite Myanmar
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2019.102973
文献子类	Article
英文摘要	The Welatam prospect, located in Kachin State, Northeast Myanmar, is the first discovered bismuth-gold locality within the Tengchong-Lianghe (Tengliang) metallogenic district. Two mineralization types, identified in this area, are related to three hydrothermal events. The massive sulfide mineralization was formed during the hydrothermal activities of stage I and II, producing mainly iron sulfides (e.g. pyrrhotite, chalcopyrite, pyrite, arsenopyrite). Whereas the activity of stage III resulted in quartz-molybdenite mineralization which is characterized by the deposition of molybdenite, galena, and Bi-Te-Au-bearing phases. The Bi-mineral assemblages suggest that at stage III, the prevailing temperatures were above 271 degrees C. Fluid-rock interaction that changed the pH, fO(2),fS(2), and, in particular, temperature in hydrothermal fluids is important in causing the precipitation of liquid bismuth from Bi3+. The high correlation between Bi and Au (R = 0.782) demonstrates that liquid bismuth may have played a crucial role in gold enrichment. Here, Bi-Au-bearing minerals commonly precipitate along the cleavages of molybdenite, forming a distinctive mineral assemblage. It may indicate that the cleavages, besides providing spaces for the precipitation of liquid bismuth, create local chemical conditions (e.g., reducing and catalytic surfaces) favorable for Bi-melt to scavenge Au from ambient fluid. The abundant Bi minerals, metal association (e.g., Cu, Bi, Mo, Au, Te, W), the restricted delta S-34 values ( - 7.3 parts per thousand to 1.9 parts per thousand) of sulfides, and the proximity with the Welatam monzogranites suggest a magmatic contribution to the ore-forming fluids.
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/26923]
专题	中国科学院上海硅酸盐研究所
推荐引用方式 GB/T 7714	Wang, Changhong,Huang, Yongjian,Ma, Yu,et al. Geochemistry, mineralogy and mineral chemistry of the Welatam Cu-Mo-Bi-Au prospect, Northeast Myanmar[J]. ORE GEOLOGY REVIEWS,2019,111.
APA	Wang, Changhong,Huang, Yongjian,Ma, Yu,&Zhang, Zhifeng.(2019).Geochemistry, mineralogy and mineral chemistry of the Welatam Cu-Mo-Bi-Au prospect, Northeast Myanmar.ORE GEOLOGY REVIEWS,111.
MLA	Wang, Changhong,et al."Geochemistry, mineralogy and mineral chemistry of the Welatam Cu-Mo-Bi-Au prospect, Northeast Myanmar".ORE GEOLOGY REVIEWS 111(2019).