The Discovery of Native Gold in Massive Sulfides from the Edmond
详细信息
- 责任者：Wu Zhongwei (Department of Earth Sciences ; Sun Yat-Sen University ; Guangzhou 510275 ; China) ; Sun Xiaoming
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(12)
- 关键词：金矿 ; gold ores ; 自然金 ; native gold ; 中印度洋海岭 ; Central Indian Ridge
- 页码：p.3749-3762
- 图表：9 illus., 3 tables, 46 refs.
- 分类号：0200
- 出版序号：20122172
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Irregular-shaped or tabular grains of native gold (<20 μm) mainly associated with anhydrite and sphalerite have been identified in sulfate ore samples and Fe-rich massive sulfides by SEM/EDS observation and XPS analysis. To a lesser extent, gold occurs as submicroscopic particles deposited on the surface of coarse-grained pyrite. EPMA results indicate that high gold contents (with an average of 6 700×10-6 Au) are associated with late-stage, low-temperature (Fe-poor) sphalerite, and silver is significantly enriched in sulfosalt minerals (5.0%~6.7% Ag) occurring at the margins of exsolved chalcopyrite grains within sphalerite. In conclusion, the mineralization of precious metals in polymetallic massive sulfides is closely related to late-stage, low to moderate temperature hydrothermal ore-forming processes at the seafloor.
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