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Investigation of Crystal-Chemical Features of Pyrite and Conditions of Its Formation

  • PHYICAL METHODS OF INVESTIGATION
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Abstract

The process of pyrite formation has been studied by nuclear gamma resonance, X-ray diffraction, and thermogravimetric analysis in combination with thermomagnetic measurements. It has been established at which sulfur content in the charge pyrite begins forming, whether this phase grows smoothly or intermittently with an increase in the sulfur content, what other minerals are formed in this process, and also at what sulfur content in the charge the accompanying minerals practically disappear and pyrite is formed (and, obviously, sulfur remains in the charge). According to the Fe–S phase diagram, pyrite is formed in the range from 37.4 to 60.05 wt % sulfur; i.e., it appears only above a certain critical content of sulfur in the samples. Pure pyrite was obtained at a sulfur content of 60.05 wt % and higher. The synthesis was carried out in a vacuum (~1 Pa) in quartz ampoules at a temperature of 1273 K. According to the research results, pyrite (FeS2) is formed from pyrrhotite and in pyrrhotite. The data obtained can be used in cosmochemistry.

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Notes

  1. Wikipedia: Venus is shrouded by an opaque layer of highly reflective clouds of sulfuric acid. High surface temperatures are caused by the greenhouse effect. The major sulfur-containing gas in Venus’ atmosphere is sulfur dioxide.

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Funding

The work was performed within the framework of the State assignment of Kirensky Institute of Physics SB RAS in the field of basic research.

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Authors and Affiliations

  1. Krasnoyarsk State Agrarian University, 660049, Krasnoyarsk, Russia

    V. V. Onufrienok & A. V. Chzhan

  2. Siberian Federal University, 660041, Krasnoyarsk, Russia

    A. V. Chzhan

Authors
  1. V. V. Onufrienok
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  2. A. V. Chzhan
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Correspondence to V. V. Onufrienok.

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The authors declare that they have no conflicts of interest.

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Translated by G. Kirakosyan

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Onufrienok, V.V., Chzhan, A.V. Investigation of Crystal-Chemical Features of Pyrite and Conditions of Its Formation. Russ. J. Inorg. Chem. 66, 1001–1010 (2021). https://doi.org/10.1134/S003602362107010X

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