Fahlore and Sphalerite from the Darasun Gold Deposit in the Eastern Transbaikal Region, Russia: I. Mineral Assemblages and Intergrowths, Chemical Composition, and Its Evolution
| Autor: | S. E. Borisovsky, O. V. Vikent’eva, N. G. Lyubimtseva, V. Yu. Prokofiev, N. S. Bortnikov |
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| Rok vydání: | 2018 |
| Předmět: |
Mineral
010504 meteorology & atmospheric sciences Geochemistry chemistry.chemical_element Geology Gold deposit engineering.material 010502 geochemistry & geophysics 01 natural sciences Mineral resource classification Sulfur Metal Sphalerite chemistry Geochemistry and Petrology visual_art visual_art.visual_art_medium engineering Economic Geology Fugacity Chemical composition 0105 earth and related environmental sciences |
| Zdroj: | Geology of Ore Deposits. 60:93-120 |
| ISSN: | 1555-6476 1075-7015 |
| DOI: | 10.1134/s1075701518020034 |
| Popis: | The mineral assemblages, mode of occurrence, and chemical compositions of coexisting fahlore and sphalerite from the Darasun gold deposit have been described. Three generations of fahlore and three generations of sphalerite have been recognized. The FeS content in sphalerite coexisting with fahlore ranges from 0.8 to 9.4 mol %. The complete solid solution series Fe-tetrahedrite–Zn-tetrahedrite–Fe-tennantite–Zn-tennantite reflected in Sb/(Sb + As) and Fe/(Fe + Zn) ratios ranging from 0 to 0.97 and from 0.07 to 1.00, respectively, with a predominant negative relationship between these ratios has been identified for the first time at the deposit. Stepped, oscillatory, and combined stepped-oscillatory growth zonings within fahlore grains and heterogeneous aggregates of fahlore have been found. Fahlore is enriched in As with respect to Sb, and Zn-tetrahedrite is followed by Fe- and Zn-tennantite from early to late generation; Zn-tetrahedrite is followed by Fe-tennantite in zoned grains and overgrown rims; sphalerite crystallized at decreased temperature and sulfur fugacity. The evolution of the chemical composition of fahlores was caused by the evolving temperature, fluid salinity, and conditions of metal migration. |
| Databáze: | OpenAIRE |
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