Mineralogical Characteristics of Metallic Minerals in Yuerya Gold Deposit of Eastern Hebei Province and Their Combination Significance
详细信息
- 责任者：Kong Dexin (Institute of Earth Science ; China University of Geosciences ; Beijing 100083 ; China) ; Yin Jingwu
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(2)
- 关键词：金矿 ; gold ores ; 河北 ; Hebei Province
- 页码：p.436-452
- 图表：illus., 8 tables, 44 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The Yuerya gold deposit is one of the important gold deposits in eastern Hebei Province.The study of the compositional variations of metallic minerals and the mode of occurrence of elements from the Yuerya gold deposit is of great significance in further understanding the metallogenic mechanism and providing the basis for further prospecting.The research on metallic minerals of the Yuerya gold deposit was carried out by means of field survey and microscopic study as well as the Electron Probe Micro Analysis(EPMA).Hydrogen,oxygen and sulfur isotopes were also analyzed to probe into the sources of ore-forming hydrothermal fluids and sulfur.The gold-bearing minerals of the Yuerya gold deposit include quartz,pyrite and tellurobismuthite,and the gold mineral is electrum.The sulfur average content of pyrite is 52.34 wt%.A comparison with the theoretical content of sulfur shows that the pyrite from Yuerya gold deposit is generally sulfur depletion,suggesting that the mineralization of deposit was related to the hydrothermal fluid.This study laid emphasis on the gold-bearing mineral tellurobismuthite which belonged to the medium and high temperature mineral and had certain genetic relationship with the formation of electrum.Based on a comparison between the amount of gold carried by electrum in pyrite and that in tellurobismuthite,the authors have come to the conclusion that the amount of gold carried by tellurobismuthite was greater than the amount of gold carried by pyrite.By analyzing hydrogen,oxygen and sulfur isotope,the authors consider that the ore-forming fluid came from magmatic water,and the sulfur came from deep-seated magma.Taking the mineralogical characteristics and combination signicance of pyrite,chalcopyrite,sphalerite,galena,tellurobismuthite and electrum into account,the authors hold that the Yuerya gold deposit belongs to middle-deep medium temperature magmatic hydrothermal deposit,and that we should pay special attention to the enrichment area of Te and Bi in the prospecting for deep ore bodies.
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