Extremely ferrous fayalite and hedenbergite from metalliferous quartzite in the Black Shale Formation in the Southern Urals

The paper reports data on the inner structure and composition of fine-grained fayalite-hedenbergite hydrothermal-metasomatic veinlet in unusual quartzite (so-called kluchevite) in the Black Shale Formation in the Southern Urals. The fayalite and hedenbergite are the most ferrous among these minerals...

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Bibliographic Details
Published in:Petrology 2014, Vol.22 (1), p.77-89
Main Author: Korinevsky, V. G.
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Ferrites
Geochemistry
Mineralogy
Mountains
Quartz
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Summary:The paper reports data on the inner structure and composition of fine-grained fayalite-hedenbergite hydrothermal-metasomatic veinlet in unusual quartzite (so-called kluchevite) in the Black Shale Formation in the Southern Urals. The fayalite and hedenbergite are the most ferrous among these minerals ever found worldwide, and their compositions extend to the ferrous end members. The minerals are devoid of Mg but contain variable Zn concentrations. The groundmass of the rock is very fine-grained and bears fayalite-hedenbergite symplectites with a minor amount of barite. The composition of fayalite in the minute phenocrysts is close to the composition of the mineral in the symplectites. Both fayalite varieties contain variable but always high ZnO concentrations (0.40–3.70 wt %). The hedenbergite exhibits analogous compositional features. Zn-bearing magnetite grains were found near these minerals, along with a number of varieties of pyrrhotite, covellite, and other Cu sulfides. Judging by its morphological features and texture, the rock is of hydrothermal genesis.
ISSN:0869-5911
1556-2085
DOI:10.1134/S0869591114010044