Fahlores compositional zoning in a porphyry-epithermal system: Biksizak occurrence, South Urals, Russia as an example

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• 作者：O. Yu. Plotinskaya (1)
  A. I. Grabezhev (2)
  R. Seltmann (3)
  
  1. Institute of Geology of Ore Deposits ; Petrography ; Mineralogy ; and Geochemistry ; Russian Academy of Sciences ; Staromonetny per. 35 ; Moscow ; 119017 ; Russia
  2. Institute of Geology and Geochemistry ; Ural Branch ; Russian Academy of Sciences ; Pochtovy per. ; 7 ; Yekaterinburg ; 620075 ; Russia
  3. Department of Earth Sciences ; Center for Russian and Central EurAsian Mineral Studies (CERCAMS) ; Natural History Museum Cromwell Road ; London ; SW7 5BD ; UK
  
• 刊名：Geology of Ore Deposits
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：57
• 期：1
• 页码：42-63
• 全文大小：5,365 KB
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• 刊物主题：Mineral Resources;
• 出版者：Springer US
• ISSN：1555-6476

文摘

Variations in the chemical composition of fahlores at the Biksizak occurrence, Birgilda-Tomino ore cluster, South Urals has been studied. Carbonate replacement base-metal mineralization is related to the Paleozoic porphyry-epithermal system. The composition of fahlores ranges from Fe-rich tennantite to Znrich tetrahedrite with variable content of Ag. The grains of fahlores are complexly zoned with a progressively increasing concentration of Sb and Ag over time. A strong positive correlation between Sb and Ag has been established. On a diagram of Ag/(Ag + Cu) versus Sb/(Sb + As), the compositions of fahlores are fitted by lines with individual slope for each sample. The slope of lines corresponding to the samples from the eastern location located close to the intrusion of porphyry diorite that is the center of porphyry-epithermal system is the lowest, whereas that corresponding to the samples from the western location more than one km distant of the center is the highest. It is shown that the composition of fahlores and its evolution could be used as an important exploration guide for porphyry-epithermal ore-forming systems.