Gold-telluride-sulfide association in the Sandaowanzi epithermal Au-Ag-Te deposit, NE China: implications for phase equilibrium and physicochemical conditions
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- 作者：Degao Zhai (1) (2) (3)
Jiajun Liu (1) (2) - 刊名：Mineralogy and Petrology
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：108
- 期：6
- 页码：853-871
- 全文大小：11,606 KB
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19. Heinrich CA, Günther D, Audétat A - 作者单位：Degao Zhai (1) (2) (3)
Jiajun Liu (1) (2)
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
2. School of Earth Science and Resources, China University of Geosciences, Beijing, 100083, China
3. Department of Geological Sciences, Indiana University, Bloomington, IN, 47405, USA - ISSN：1438-1168
文摘
The Sandaowanzi gold-telluride deposit, with a total reserve of ?≥-5?t of Au and an average grade of 15?g/t, is located in the Great Hinggan Range Metallogenic Belt in NE China. This deposit is the first reported case of a dominantly Au (±Ag)-telluride deposit in this area and it reveals highly economic bonanza Au- and Ag-telluride ores. Ore bodies principally occur in quartz veins and stockworks and minor in disseminations hosted by trachyandesites and andesitic breccias. Four paragenetic stages of mineralization are identified, demonstrating an early deposition of sulfides and subsequent precipitation of tellurides, which are mainly composed by petzite, sylvanite and to a lesser extent, hessite, calaverite, altaite, unnamed telluride (Au1.8Ag0.2Te), krennerite, empressite, stützite and coloradoite. Abundant telluride assemblages identified from Sandaowanzi ores are mostly attributed to breakdown of early tellurium-bearing phases (i.e., γ- and χ-phases) during cooling. The deposition of substantial Au-Ag-Te minerals are constructed under physicochemical conditions of T--40 to 280?°C, pH--.39 to 5.64, logfO2--4.8 to -1.8, logfTe2--.75 to -.43, logαAu+ (aq)/αAg+ (aq)-??6.87 to -.56, and gold is mostly scavenged from a HTe?/sup>-dominant ore-forming fluid. The unusually high Te concentrations in the Sandaowanzi epithermal system are likely attributed to alkaline to calc-alkaline magmatic degassing.